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  • Is inconsistent formatting a sign of a sloppy programmer?

    - by dreza
    I understand that everyone has their own style of programming and that you should be able to read other people's styles and accept it for what it is. However, would one be considered a sloppy programmer if one's style of coding was inconsistent across whatever standard they were working against? Some example of inconsistencies might be: Sometimes naming private variables with _ and sometimes not Sometimes having varying indentations within code blocks Not aligning braces up i.e. same column if using start using new line style Spacing not always consistent around operators i.e. p=p+1, p+=1 vs other times p =p+1 or p = p + 1 etc Is this even something that as a programmer I should be concerned with addressing? Or is it such a minor nit picking thing that at the end of the day I should just not worry about it and worry about what the end user sees and whether the code works rather than how it looks while working? Is it sloppy programming or just over obsessive nit picking? EDIT: After some excellent comments I realized I may have left out some information in my question. This question came about after reviewing another colleagues code check-in and noticing some of these things and then realizing that I've seen these kind of in-consistencies in previous check-ins. It then got me thinking about my code and whether I do the same things and noticed that I typically don't etc I'm not suggesting his technique is either bad or good in this question or whether his way of doing things is right or wrong. EDIT: To answer some queries to some more good feed back. The specific instance this review occurred in was using Visual Studio 2010 and programming in c# so I don't think the editor would cause any issues. In fact it should only help I would hope. Sorry if I left that piece of info out and it effects any current answers. I was trying to be a bit more generic in understanding if this would be considered sloppy etc. And to add an even more specific example of a code piece I saw during reading of the check-in: foreach(var block in Blocks) { // .. some other code in here foreach(var movement in movements) { movement.Moved.Zero(); } // the un-formatted brace } Such a minor thing I know, but many small things add up(???), and I did have to double glance at the code at the time to see where everything lined up I guess. Please note this code was formatted appropriately before this check-in. EDIT: After reading some great answers and varying thoughts, the summary I've taken from this was. It's not necessarily a sign of a sloppy programmer however as programmers we have a duty (to ourselves and other programmers) to make the code as readable as possible to assist in further ongoing development. However it can hint at inadequacies which is something that is only possible to review on a case by case (person by person) basis. There are many reasons why this might occur. They should be taken in context and worked through with the person/people involved if reasonable. We have a duty to try and help all programmers become better programmers! In the good old days when development was done using good old notepad (or other simple text editing tool) this occurred much more frequently. However we have the assistance of modern IDE's now so although we shouldn't necessarily become OTT about this, it should still probably be addressed to some degree. We as programmers vary in our standards, styles and approaches to solutions. However it seems that in general we all take PRIDE in our work and as a trait it is something that can stand programmers apart. Making something to the best of our abilities both internal (code) and external (end user result) goes along way to giving us that big fat pat on the back that we may not go looking for but swells our heart with pride. And finally to quote CrazyEddie from his post below. Don't sweat the small stuff

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  • Problems implementing a screen space shadow ray tracing shader

    - by Grieverheart
    Here I previously asked for the possibility of ray tracing shadows in screen space in a deferred shader. Several problems were pointed out. One of the most important problem is that only visible objects can cast shadows and objects between the camera and the shadow caster can interfere. Still I thought it'd be a fun experiment. The idea is to calculate the view coordinates of pixels and cast a ray to the light. The ray is then traced pixel by pixel to the light and its depth is compared with the depth at the pixel. If a pixel is in front of the ray, a shadow is casted at the original pixel. At first I thought that I could use the DDA algorithm in 2D to calculate the distance 't' (in p = o + t d, where o origin, d direction) to the next pixel and use it in the 3D ray equation to find the ray's z coordinate at that pixel's position. For the 2D ray, I would use the projected and biased 3D ray direction and origin. The idea was that 't' would be the same in both 2D and 3D equations. Unfortunately, this is not the case since the projection matrix is 4D. Thus, some tweak needs to be done to make this work this way. I would like to ask if someone knows of a way to do what I described above, i.e. from a 2D ray in texture coordinate space to get the 3D ray in screen space. I did implement a simple version of the idea which you can see in the following video: video here Shadows may seem a bit pixelated, but that's mostly because of the size of the step in 't' I chose. And here is the shader: #version 330 core uniform sampler2D DepthMap; uniform vec2 projAB; uniform mat4 projectionMatrix; const vec3 light_p = vec3(-30.0, 30.0, -10.0); noperspective in vec2 pass_TexCoord; smooth in vec3 viewRay; layout(location = 0) out float out_AO; vec3 CalcPosition(void){ float depth = texture(DepthMap, pass_TexCoord).r; float linearDepth = projAB.y / (depth - projAB.x); vec3 ray = normalize(viewRay); ray = ray / ray.z; return linearDepth * ray; } void main(void){ vec3 origin = CalcPosition(); if(origin.z < -60) discard; vec2 pixOrigin = pass_TexCoord; //tex coords vec3 dir = normalize(light_p - origin); vec2 texel_size = vec2(1.0 / 600.0); float t = 0.1; ivec2 pixIndex = ivec2(pixOrigin / texel_size); out_AO = 1.0; while(true){ vec3 ray = origin + t * dir; vec4 temp = projectionMatrix * vec4(ray, 1.0); vec2 texCoord = (temp.xy / temp.w) * 0.5 + 0.5; ivec2 newIndex = ivec2(texCoord / texel_size); if(newIndex != pixIndex){ float depth = texture(DepthMap, texCoord).r; float linearDepth = projAB.y / (depth - projAB.x); if(linearDepth > ray.z + 0.1){ out_AO = 0.2; break; } pixIndex = newIndex; } t += 0.5; if(texCoord.x < 0 || texCoord.x > 1.0 || texCoord.y < 0 || texCoord.y > 1.0) break; } } As you can see, here I just increment 't' by some arbitrary factor, calculate the 3D ray and project it to get the pixel coordinates, which is not really optimal. Hopefully, I would like to optimize the code as much as possible and compare it with shadow mapping and how it scales with the number of lights. PS: Keep in mind that I reconstruct position from depth by interpolating rays through a full screen quad.

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  • What is the best Broadphase Interface for moving spheres?

    - by Molmasepic
    As of now I am working on optimizing the performance of the physics and collision, and as of now I am having some slowdowns on my other computers from my main. I have well over 3000 btSphereShape Rigidbodies and 2/3 of them do not move at all, but I am noticing(by the profile below) that collision is taking a bit of time to maneuver. Each sample counts as 0.01 seconds. % cumulative self self total time seconds seconds calls ms/call ms/call name 10.09 0.65 0.65 SphereTriangleDetector::collide(btVector3 const&, btVector3&, btVector3&, float&, float&, float) 7.61 1.14 0.49 btSphereTriangleCollisionAlgorithm::processCollision(btCollisionObject*, btCollisionObject*, btDispatcherInfo const&, btManifoldResult*) 5.59 1.50 0.36 btConvexTriangleCallback::processTriangle(btVector3*, int, int) 5.43 1.85 0.35 btQuantizedBvh::reportAabbOverlappingNodex(btNodeOverlapCallback*, btVector3 const&, btVector3 const&) const 4.97 2.17 0.32 btBvhTriangleMeshShape::processAllTriangles(btTriangleCallback*, btVector3 const&, btVector3 const&) const::MyNodeOverlapCallback::processNode(int, int) 4.19 2.44 0.27 btSequentialImpulseConstraintSolver::resolveSingleConstraintRowGeneric(btRigidBody&, btRigidBody&, btSolverConstraint const&) 4.04 2.70 0.26 btSequentialImpulseConstraintSolver::resolveSingleConstraintRowLowerLimit(btRigidBody&, btRigidBody&, btSolverConstraint const&) 3.73 2.94 0.24 Ogre::OctreeSceneManager::walkOctree(Ogre::OctreeCamera*, Ogre::RenderQueue*, Ogre::Octree*, Ogre::VisibleObjectsBoundsInfo*, bool, bool) 3.42 3.16 0.22 btTriangleShape::getVertex(int, btVector3&) const 2.48 3.32 0.16 Ogre::Frustum::isVisible(Ogre::AxisAlignedBox const&, Ogre::FrustumPlane*) const 2.33 3.47 0.15 1246357 0.00 0.00 Gorilla::Layer::setVisible(bool) 2.33 3.62 0.15 SphereTriangleDetector::getClosestPoints(btDiscreteCollisionDetectorInterface::ClosestPointInput const&, btDiscreteCollisionDetectorInterface::Result&, btIDebugDraw*, bool) 1.86 3.74 0.12 btCollisionDispatcher::findAlgorithm(btCollisionObject*, btCollisionObject*, btPersistentManifold*) 1.86 3.86 0.12 btSequentialImpulseConstraintSolver::setupContactConstraint(btSolverConstraint&, btCollisionObject*, btCollisionObject*, btManifoldPoint&, btContactSolverInfo const&, btVector3&, float&, float&, btVector3&, btVector3&) 1.71 3.97 0.11 btTriangleShape::getEdge(int, btVector3&, btVector3&) const 1.55 4.07 0.10 _Unwind_SjLj_Register 1.55 4.17 0.10 _Unwind_SjLj_Unregister 1.55 4.27 0.10 Ogre::D3D9HardwareVertexBuffer::updateBufferResources(char const*, Ogre::D3D9HardwareVertexBuffer::BufferResources*) 1.40 4.36 0.09 btManifoldResult::addContactPoint(btVector3 const&, btVector3 const&, float) 1.40 4.45 0.09 btSequentialImpulseConstraintSolver::setupFrictionConstraint(btSolverConstraint&, btVector3 const&, btRigidBody*, btRigidBody*, btManifoldPoint&, btVector3 const&, btVector3 const&, btCollisionObject*, btCollisionObject*, float, float, float) 1.24 4.53 0.08 btSequentialImpulseConstraintSolver::convertContact(btPersistentManifold*, btContactSolverInfo const&) 1.09 4.60 0.07 408760 0.00 0.00 Living::MapHide() 1.09 4.67 0.07 btSphereTriangleCollisionAlgorithm::~btSphereTriangleCollisionAlgorithm() 1.09 4.74 0.07 inflate_fast EDIT: Updated to show current Profile. I have only listed the functions using over 1% time from the many functions that are being used. Another thing is that each monster has a certain area that they stay in and are only active when a player is in said area. I was wondering if maybe there is a way to deactivate the non-active monsters from bullet(reactivating once in the area again) or maybe theres a different broadphase interface that I should use. The current BPI is btDbvtBroadphase. EDIT: Here is the Profile on the other computer(the top one is my main) Each sample counts as 0.01 seconds. % cumulative self self total time seconds seconds calls ms/call ms/call name 12.18 1.19 1.19 SphereTriangleDetector::collide(btVector3 const&, btVector3&, btVector3&, float&, float&, float) 6.76 1.85 0.66 btSphereTriangleCollisionAlgorithm::processCollision(btCollisionObject*, btCollisionObject*, btDispatcherInfo const&, btManifoldResult*) 5.83 2.42 0.57 btQuantizedBvh::reportAabbOverlappingNodex(btNodeOverlapCallback*, btVector3 const&, btVector3 const&) const 5.12 2.92 0.50 btConvexTriangleCallback::processTriangle(btVector3*, int, int) 4.61 3.37 0.45 btTriangleShape::getVertex(int, btVector3&) const 4.09 3.77 0.40 _Unwind_SjLj_Register 3.48 4.11 0.34 btBvhTriangleMeshShape::processAllTriangles(btTriangleCallback*, btVector3 const&, btVector3 const&) const::MyNodeOverlapCallback::processNode(int, int) 2.46 4.35 0.24 btSequentialImpulseConstraintSolver::resolveSingleConstraintRowLowerLimit(btRigidBody&, btRigidBody&, btSolverConstraint const&) 2.15 4.56 0.21 _Unwind_SjLj_Unregister 2.15 4.77 0.21 SphereTriangleDetector::getClosestPoints(btDiscreteCollisionDetectorInterface::ClosestPointInput const&, btDiscreteCollisionDetectorInterface::Result&, btIDebugDraw*, bool) 1.84 4.95 0.18 btTriangleShape::getEdge(int, btVector3&, btVector3&) const 1.64 5.11 0.16 btSequentialImpulseConstraintSolver::resolveSingleConstraintRowGeneric(btRigidBody&, btRigidBody&, btSolverConstraint const&) 1.54 5.26 0.15 btSequentialImpulseConstraintSolver::setupContactConstraint(btSolverConstraint&, btCollisionObject*, btCollisionObject*, btManifoldPoint&, btContactSolverInfo const&, btVector3&, float&, float&, btVector3&, btVector3&) 1.43 5.40 0.14 Ogre::D3D9HardwareVertexBuffer::updateBufferResources(char const*, Ogre::D3D9HardwareVertexBuffer::BufferResources*) 1.33 5.53 0.13 btManifoldResult::addContactPoint(btVector3 const&, btVector3 const&, float) 1.13 5.64 0.11 btRigidBody::predictIntegratedTransform(float, btTransform&) 1.13 5.75 0.11 btTriangleIndexVertexArray::getLockedReadOnlyVertexIndexBase(unsigned char const**, int&, PHY_ScalarType&, int&, unsigned char const**, int&, int&, PHY_ScalarType&, int) const 1.02 5.85 0.10 btSphereTriangleCollisionAlgorithm::CreateFunc::CreateCollisionAlgorithm(btCollisionAlgorithmConstructionInfo&, btCollisionObject*, btCollisionObject*) 1.02 5.95 0.10 btSphereTriangleCollisionAlgorithm::btSphereTriangleCollisionAlgorithm(btPersistentManifold*, btCollisionAlgorithmConstructionInfo const&, btCollisionObject*, btCollisionObject*, bool) Edited same as other Profile.

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  • 65536% Autogrowth!

    - by Tara Kizer
    Twice a year, we move our production systems to our disaster recovery site.  Last Saturday night was one of those days.  There are about 50 SQL Server databases to be moved to the DR site, which is done via database mirroring.  It takes only a few seconds to failover, but some databases have a bit more involved work such as setting up replication.  Everything went relatively smooth, but we encountered a weird bug on our most mission critical system.  After everything was successfully failed over to the DR site, it was noticed that mirroring was in a suspended state on one of the databases.  We thought we had run into a SQL Server 2005 bug that we had been encountering and were working with Microsoft on a fix.  Microsoft did fix it in both SQL Server 2005 service pack 3 cumulative update package 13 and service pack 4 cumulative update package 2, however SP3 CU13 and SP4 both recently failed on this system so we were not patched yet with the bug fix.  As the suspended state was causing us issues with replication, we dropped mirroring.  We then noticed we had 10MB of free disk space on the mount point where the principal’s data files are stored.  I knew something went amiss as this system should have at least 150GB free on that mount point.  I immediately checked the main database’s data file and was shocked to see an autgrowth size of 65536%.  The data file autogrew right before mirroring went into the suspended state. 65536%! I didn’t have a lot of time to research if this autgrowth problem was a known SQL Server bug, so I deferred that research to today.  A quick Google search yielded no results but emphasis on “quick”.  I checked our performance system, which was recently restored with a copy of the affected production database, and found the autogrowth setting to be 512MB.  So this autogrowth bug was encountered sometime in the last two weeks.  On February 26th, we had attempted to install SQL 2005 SP4 on production, however it had failed (PSS case open with Microsoft).  I suspected that the SP4 failure was somehow related to this autgrowth bug although that turned out not to be the case. I then tweeted (@TaraKizer) about this problem to see if the SQL Server community (#sqlhelp) had any insights.  It seems several people have either heard of this bug or encountered it.  Aaron Bertrand (blog|twitter) referred me to this Connect item. Our affected database originated on SQL Server 2000 and was upgraded to SQL Server 2005 in 2007.  Back on SQL Server 2000, we were using the default file growth setting which was a percentage.  Sometime after the 2005 upgrade is when we changed it to 512MB.  Our situation seemed to fit the bug Aaron referred to me, so now the question was whether Microsoft had fixed it yet. I received a reply to my tweet from Amit Banerjee (twitter) that it had been fixed in SP3 CU1 (KB958004).  My affected system is SP3 CU8, so I was initially confused why we had encountered the bug.  Because I don’t read things fully, I had missed that there are additional steps you have to follow after applying the bug fix.  Amit set me straight.  Although you can read this information in the KB article, I will also copy it here in case you are as lazy as me and miss the most important section of it (although if you are as lazy as me, you won’t have read this far down my blog post): This hotfix will prevent only future occurrences of this problem. For example, if you restore a database from SQL Server 2000 to a SQL Server 2005 instance that contains this hotfix, this problem will not occur. However, if you already have a database that is affected by this problem, you must follow these steps to resolve this problem manually: Apply this hotfix. Set the file growth settings for the affected files to percentage settings, and then set the settings back to megabyte settings. Take the database offline, and then bring it back online. Verify that the values of the is_percent_growth column are correct in the sys.database_files system table and in the sys.master_files system table.

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  • SQL SERVER – Renaming Index – Index Naming Conventions

    - by pinaldave
    If you are regular reader of this blog, you must be aware of that there are two kinds of blog posts 1) I share what I learn recently 2) I share what I learn and request your participation. Today’s blog post is where I need your opinion to make this blog post a good reference for future. Background Story Recently I came across system where users have changed the name of the few of the table to match their new standard naming convention. The name of the table should be self explanatory and they should have explain their purpose without either opening it or reading documentations. Well, not every time this is possible but again this should be the goal of any database modeler. Well, I no way encourage the name of the tables to be too long like ‘ContainsDetailsofNewInvoices’. May be the name of the table should be ‘Invoices’ and table should contain a column with New/Processed bit filed to indicate if the invoice is processed or not (if necessary). Coming back to original story, the database had several tables of which the name were changed. Story Continues… To continue the story let me take simple example. There was a table with the name  ’ReceivedInvoices’, it was changed to new name as ‘TblInvoices’. As per their new naming standard they had to prefix every talbe with the words ‘Tbl’ and prefix every view with the letters ‘Vw’. Personally I do not see any need of the prefix but again, that issue is not here to discuss.  Now after changing the name of the table they faced very interesting situation. They had few indexes on the table which had name of the table. Let us take an example. Old Name of Table: ReceivedInvoice Old Name of Index: Index_ReceivedInvoice1 Here is the new names New Name of Table: TblInvoices New Name of Index: ??? Well, their dilemma was what should be the new naming convention of the Indexes. Here is a quick proposal of the Index naming convention. Do let me know your opinion. If Index is Primary Clustered Index: PK_TableName If Index is  Non-clustered Index: IX_TableName_ColumnName1_ColumnName2… If Index is Unique Non-clustered Index: UX_TableName_ColumnName1_ColumnName2… If Index is Columnstore Non-clustered Index: CL_TableName Here ColumnName is the column on which index is created. As there can be only one Primary Key Index and Columnstore Index per table, they do not require ColumnName in the name of the index. The purpose of this new naming convention is to increase readability. When any user come across this index, without opening their properties or definition, user can will know the details of the index. T-SQL script to Rename Indexes Here is quick T-SQL script to rename Indexes EXEC sp_rename N'SchemaName.TableName.IndexName', N'New_IndexName', N'INDEX'; GO Your Contribute Please Well, the organization has already defined above four guidelines, personally I follow very similar guidelines too. I have seen many variations like adding prefixes CL for Clustered Index and NCL for Non-clustered Index. I have often seen many not using UX prefix for Unique Index but rather use generic IX prefix only. Now do you think if they have missed anything in the coding standard. Is NCI and CI prefixed required to additionally describe the index names. I have once received suggestion to even add fill factor in the index name – which I do not recommend at all. What do you think should be ideal name of the index, so it explains all the most important properties? Additionally, you are welcome to vote if you believe changing the name of index is just waste of time and energy.  Note: The purpose of the blog post is to encourage all to participate with their ideas. I will write follow up blog posts in future compiling all the suggestions. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Index, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • EPM 11.1.2.2.000 - released

    - by THE
    Normal 0 21 false false false DE X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} Oracle’s EPM System Development Team is pleased to announce General Availability of Oracle Hyperion Enterprise Performance Management System release 11.1.2.2.  This release is available on the Oracle Software Delivery Cloud (  https://edelivery.oracle.com).  This is a localized release available in multiple languages. See "System Requirements and Supported Platforms for Oracle Enterprise Performance Management System 11.1.2.2" ( http://www.oracle.com/technetwork/middleware/ias/downloads/fusion-certification-100350.html)  for details.  In this release, EPM System products extend the new features and products offered with release 11.1.2.1. Please visit the product "New Features Guides" ( http://docs.oracle.com/cd/E17236_01/index.htm), available in the Enterprise Performance Management System Documentation Library for more information. Note: Oracle Hyperion Calculation Manager has replaced Oracle Hyperion Business Rules as the mechanism for designing and managing business rules, therefore, Business Rules is no longer released with EPM System Release 11.1.2.2. If you are applying 11.1.2.2 as a maintenance release, or upgrading to Release 11.1.2.2, and have been using Business Rules in an earlier release, you must migrate to Calculation Manager rules in Release 11.1.2.2. See Oracle Enterprise Performance Management System Installation and Configuration Guide. The EPM System Media pack on Oracle Software Delivery Cloud has been simplified.  Software downloads have been merged together. See the Media Pack Readme for a list of downloads needed for your domain/product. IBM WebSphere 7.0.0.19+ (AS, ND) is now supported as an application server.  Documentation about deploying to WebSphere is in the chapter titled “Deploying EPM System Products to WebSphere Application Server” in the Oracle Enterprise Performance Management System Installation and Configuration Guide. FireFox 10.x+ and Internet Explorer 9 are now supported Web browsers. Microsoft Office 2010 64 bit is now supported. Microsoft Windows Installer (MSI) Client Installers are now provided for Oracle Essbase Client, Oracle Essbase Administration Services Console, Oracle Essbase Studio Console, and Oracle Hyperion Financial Management Client. Online Help content for EPM System products is served from a central Oracle download location, which reduces the download and installation time for EPM System. You can also install and configure online Help to run locally. For more information, see the Oracle Enterprise Performance Management System Installation and Configuration Guide.  For more information on , please see the “Oracle Enterprise Performance Management System, Release 11.1.2.2.000 Readme ( http://docs.oracle.com/cd/E17236_01/epm.1112/epm_1112200_readme.pdf).

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  • HOWTO Turn off SPARC T4 or Intel AES-NI crypto acceleration.

    - by darrenm
    Since we released hardware crypto acceleration for SPARC T4 and Intel AES-NI support we have had a common question come up: 'How do I test without the hardware crypto acceleration?'. Initially this came up just for development use so developers can do unit testing on a machine that has hardware offload but still cover the code paths for a machine that doesn't (our integration and release testing would run on all supported types of hardware anyway).  I've also seen it asked in a customer context too so that we can show that there is a performance gain from the hardware crypto acceleration, (not just the fact that SPARC T4 much faster performing processor than T3) and measure what it is for their application. With SPARC T2/T3 we could easily disable the hardware crypto offload by running 'cryptoadm disable provider=n2cp/0'.  We can't do that with SPARC T4 or with Intel AES-NI because in both of those classes of processor the encryption doesn't require a device driver instead it is unprivileged user land callable instructions. Turns out there is away to do this by using features of the Solaris runtime loader (ld.so.1). First I need to expose a little bit of implementation detail about how the Solaris Cryptographic Framework is implemented in Solaris 11.  One of the new Solaris 11 features of the linker/loader is the ability to have a single ELF object that has multiple different implementations of the same functions that are selected at runtime based on the capabilities of the machine.  The alternate to this is having the application coded to call getisax() and make the choice itself.  We use this functionality of the linker/loader when we build the userland libraries for the Solaris Cryptographic Framework (specifically libmd.so, and the unfortunately misnamed due to historical reasons libsoftcrypto.so) The Solaris linker/loader allows control of a lot of its functionality via environment variables, we can use that to control the version of the cryptographic functions we run.  To do this we simply export the LD_HWCAP environment variable with values that tell ld.so.1 to not select the HWCAP section matching certain features even if isainfo says they are present.  For SPARC T4 that would be: export LD_HWCAP="-aes -des -md5 -sha256 -sha512 -mont -mpul" and for Intel systems with AES-NI support: export LD_HWCAP="-aes" This will work for consumers of the Solaris Cryptographic Framework that use the Solaris PKCS#11 libraries or use libmd.so interfaces directly.  It also works for the Oracle DB and Java JCE.  However does not work for the default enabled OpenSSL "t4" or "aes-ni" engines (unfortunately) because they do explicit calls to getisax() themselves rather than using multiple ELF cap sections. However we can still use OpenSSL to demonstrate this by explicitly selecting "pkcs11" engine  using only a single process and thread.  $ openssl speed -engine pkcs11 -evp aes-128-cbc ... type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes aes-128-cbc 54170.81k 187416.00k 489725.70k 805445.63k 1018880.00k $ LD_HWCAP="-aes" openssl speed -engine pkcs11 -evp aes-128-cbc ... type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes aes-128-cbc 29376.37k 58328.13k 79031.55k 86738.26k 89191.77k We can clearly see the difference this makes in the case where AES offload to the SPARC T4 was disabled. The "t4" engine is faster than the pkcs11 one because there is less overhead (again on a SPARC T4-1 using only a single process/thread - using -multi you will get even bigger numbers). $ openssl speed -evp aes-128-cbc ... type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes aes-128-cbc 85526.61k 89298.84k 91970.30k 92662.78k 92842.67k Yet another cool feature of the Solaris linker/loader, thanks Rod and Ali. Note these above openssl speed output is not intended to show the actual performance of any particular benchmark just that there is a significant improvement from using hardware acceleration on SPARC T4. For cryptographic performance benchmarks see the http://blogs.oracle.com/BestPerf/ postings.

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  • It's like I'm in recovery mode after update, but I'm not

    - by mawburn
    I used the Ubuntu software updater and updated to the most recent packages. After the last update today, it's like I have gone into recovery mode, but I haven't. I am running UbuntuGNOME First, everything looks like this: Switching to dark mode does nothing. Also, default applications do not work. Such as Startup and the default screenshot application. Everything was working fine before the latest software update. System Info Ubuntu 14.04 LTS Gnome-Shell 3.10.4 Kernel 3.13.0-29 I can't figure out how to get an update history, but this is almost a fresh install. It's about a week old install and this is the 3rd time I've used the Ubuntu Software Update. I am running AMD ATI HD6700 with the proprietary Catalyst drivers. I tried to provide all information that I thought would be useful, if you need any more please let me know. Edit - I believe something went wrong within these updates: Update Log: Start-Date: 2014-06-09 19:07:07 Commandline: aptdaemon role='role-commit-packages' sender=':1.68' Install: libgnome-desktop-3-10:amd64 (3.12.0-0~eugenesan~trusty2) Upgrade: gnome-session-common:amd64 (3.9.90-0ubuntu12, 3.12.0-0~eugenesan~trusty10), gnome-session-bin:amd64 (3.9.90-0ubuntu12, 3.12.0-0~eugenesan~trusty10), gir1.2-gnomedesktop-3.0:amd64 (3.8.4-0ubuntu3, 3.12.0-0~eugenesan~trusty2), gnome-session:amd64 (3.9.90-0ubuntu12, 3.12.0-0~eugenesan~trusty10), python-libxml2:amd64 (2.9.1+dfsg1-3ubuntu4.1, 2.9.1+dfsg1-3ubuntu4.2), libspice-server1:amd64 (0.12.4-0nocelt2, 0.12.4-0nocelt2.02~eugenesan~trusty1), gir1.2-mutter-3.0:amd64 (3.10.4-0ubuntu2, 3.10.4-0ubuntu2.1), xserver-xorg-video-qxl:amd64 (0.1.1-0ubuntu3, 0.1.1-0ubuntu3.01), libxml2:amd64 (2.9.1+dfsg1-3ubuntu4.1, 2.9.1+dfsg1-3ubuntu4.2), libxml2:i386 (2.9.1+dfsg1-3ubuntu4.1, 2.9.1+dfsg1-3ubuntu4.2), gnome-desktop3-data:amd64 (3.8.4-0ubuntu3, 3.12.0-0~eugenesan~trusty2), mutter:amd64 (3.10.4-0ubuntu2, 3.10.4-0ubuntu2.1), mutter-common:amd64 (3.10.4-0ubuntu2, 3.10.4-0ubuntu2.1), libxml2-utils:amd64 (2.9.1+dfsg1-3ubuntu4.1, 2.9.1+dfsg1-3ubuntu4.2), libmutter0c:amd64 (3.10.4-0ubuntu2, 3.10.4-0ubuntu2.1) End-Date: 2014-06-09 19:07:12 I also installed Citrix Receiver today, following the tutorial here: Citrix Receiver 12.1 on Ubuntu 14.04 64-bit Log Start-Date: 2014-06-09 18:59:06 Commandline: apt-get install libmotif4:i386 nspluginwrapper lib32z1 libc6-i386 libxp6:i386 libxpm4:i386 libasound2:i386 Install: libmotif-common:amd64 (2.3.4-5, automatic), libatk1.0-0:i386 (2.10.0-2ubuntu2, automatic), libxft2:i386 (2.3.1-2, automatic), libgraphite2-3:i386 (1.2.4-1ubuntu1, automatic), nspluginviewer:i386 (1.4.4-0ubuntu5, automatic), libpango-1.0-0:i386 (1.36.3-1ubuntu1, automatic), libxcursor1:i386 (1.1.14-1, automatic), libmotif4:i386 (2.3.4-5), libxm4:amd64 (2.3.4-5, automatic), libxm4:i386 (2.3.4-5, automatic), libxp6:i386 (1.0.2-1ubuntu1), libpangocairo-1.0-0:i386 (1.36.3-1ubuntu1, automatic), libxcb-render0:i386 (1.10-2ubuntu1, automatic), libthai0:i386 (0.1.20-3, automatic), libharfbuzz0b:i386 (0.9.27-1, automatic), libpixman-1-0:i386 (0.30.2-2ubuntu1, automatic), libpangoft2-1.0-0:i386 (1.36.3-1ubuntu1, automatic), libcairo2:i386 (1.13.0~20140204-0ubuntu1, automatic), lib32z1:amd64 (1.2.8.dfsg-1ubuntu1), libjasper1:i386 (1.900.1-14ubuntu3, automatic), libgtk2.0-0:i386 (2.24.23-0ubuntu1.1, automatic), nspluginwrapper:amd64 (1.4.4-0ubuntu5), libuil4:amd64 (2.3.4-5, automatic), libuil4:i386 (2.3.4-5, automatic), libxcb-shm0:i386 (1.10-2ubuntu1, automatic), libxmu6:i386 (1.1.1-1, automatic), libc6-i386:amd64 (2.19-0ubuntu6), libxinerama1:i386 (1.1.3-1, automatic), libgdk-pixbuf2.0-0:i386 (2.30.7-0ubuntu1, automatic), libxcomposite1:i386 (0.4.4-1, automatic), libmrm4:amd64 (2.3.4-5, automatic), libmrm4:i386 (2.3.4-5, automatic), libdatrie1:i386 (0.2.8-1, automatic), libxrandr2:i386 (1.4.2-1, automatic), libxpm4:i386 (3.5.10-1) End-Date: 2014-06-09 18:59:11

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  • View AccuWeather Forecasts in Google Chrome

    - by Asian Angel
    Being able to keep an eye on the weather while at work or browsing the Internet is definitely helpful. If you like detailed forecasts then join us as we take a look at the Forecastfox Weather extension for Google Chrome. Getting Started As soon as the Forecastfox Weather extension has finished installing you will automatically be presented with the “Customize Forecastfox Page”. The default setting is for New York with English measurement units. Enter your location into the blank and hit “Enter” to display the listing for your city/area. If you are presented multiple options to choose from simply click on the appropriate listing. Once you have your city/area displayed you will notice that it is possible to have access to weather forecasts for multiple locations. You can easily remove any unneeded listings with the “Remove Link”. For our example we removed the New York listing. Note: Click on desired locations and measurement units to automatically set them as defaults (no save button required). Forecastfox Weather in Action You can hover your mouse over the “Toolbar Button” to see the current weather conditions. Clicking on the “Toolbar Button” opens a popup window with the current conditions, 7 day forecast, and a static satellite image. If desired you can access additional details for the current weather conditions. Clicking on “details” opens a new tab with a nice bit of information such as UV Index, Moon Phases, Cloud Ceiling, etc. Note: AccuWeather.com webpages will have some ads displayed. Perhaps you need the Hourly Forecast… Once again a new tab will be opened with the predicted hourly weather conditions for the current day. Going back to the popup window you may also select a specific day from the 7 day forecast. You will be presented with a “Day & Night” forecast for the chosen day with links to view “Additional Details & Hourly” information. Interested in the satellite image instead? You can click on either of the available links for larger images. Once the new tab is open you can choose from a variety of different satellite images. Conclusion If you have been wanting a solid weather forecast extension for your Chrome browser then Forecastfox Weather is definitely a recommended install. Links Download the Forecastfox Weather extension (Google Chrome Extensions) Similar Articles Productive Geek Tips Add Weather Forecasts to Google ChromeView Weather Underground Forecasts in Google ChromeView the Time & Date in Chrome When Hiding Your TaskbarView Maps and Get Directions in Google ChromeGoogle Image Search Quick Fix TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Office 2010 Product Guides Google Maps Place marks – Pizza, Guns or Strip Clubs Monitor Applications With Kiwi LocPDF is a Visual PDF Search Tool Download Free iPad Wallpapers at iPad Decor Get Your Delicious Bookmarks In Firefox’s Awesome Bar

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  • Default Parameters vs Method Overloading

    - by João Angelo
    With default parameters introduced in C# 4.0 one might be tempted to abandon the old approach of providing method overloads to simulate default parameters. However, you must take in consideration that both techniques are not interchangeable since they show different behaviors in certain scenarios. For me the most relevant difference is that default parameters are a compile time feature while method overloading is a runtime feature. To illustrate these concepts let’s take a look at a complete, although a bit long, example. What you need to retain from the example is that static method Foo uses method overloading while static method Bar uses C# 4.0 default parameters. static void CreateCallerAssembly(string name) { // Caller class - Invokes Example.Foo() and Example.Bar() string callerCode = String.Concat( "using System;", "public class Caller", "{", " public void Print()", " {", " Console.WriteLine(Example.Foo());", " Console.WriteLine(Example.Bar());", " }", "}"); var parameters = new CompilerParameters(new[] { "system.dll", "Common.dll" }, name); new CSharpCodeProvider().CompileAssemblyFromSource(parameters, callerCode); } static void Main() { // Example class - Foo uses overloading while Bar uses C# 4.0 default parameters string exampleCode = String.Concat( "using System;", "public class Example", "{{", " public static string Foo() {{ return Foo(\"{0}\"); }}", " public static string Foo(string key) {{ return \"FOO-\" + key; }}", " public static string Bar(string key = \"{0}\") {{ return \"BAR-\" + key; }}", "}}"); var compiler = new CSharpCodeProvider(); var parameters = new CompilerParameters(new[] { "system.dll" }, "Common.dll"); // Build Common.dll with default value of "V1" compiler.CompileAssemblyFromSource(parameters, String.Format(exampleCode, "V1")); // Caller1 built against Common.dll that uses a default of "V1" CreateCallerAssembly("Caller1.dll"); // Rebuild Common.dll with default value of "V2" compiler.CompileAssemblyFromSource(parameters, String.Format(exampleCode, "V2")); // Caller2 built against Common.dll that uses a default of "V2" CreateCallerAssembly("Caller2.dll"); dynamic caller1 = Assembly.LoadFrom("Caller1.dll").CreateInstance("Caller"); dynamic caller2 = Assembly.LoadFrom("Caller2.dll").CreateInstance("Caller"); Console.WriteLine("Caller1.dll:"); caller1.Print(); Console.WriteLine("Caller2.dll:"); caller2.Print(); } And if you run this code you will get the following output: // Caller1.dll: // FOO-V2 // BAR-V1 // Caller2.dll: // FOO-V2 // BAR-V2 You see that even though Caller1.dll runs against the current Common.dll assembly where method Bar defines a default value of “V2″ the output show us the default value defined at the time Caller1.dll compiled against the first version of Common.dll. This happens because the compiler will copy the current default value to each method call, much in the same way a constant value (const keyword) is copied to a calling assembly and changes to it’s value will only be reflected if you rebuild the calling assembly again. The use of default parameters is also discouraged by Microsoft in public API’s as stated in (CA1026: Default parameters should not be used) code analysis rule.

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  • Part 7: EBS Modifications and Flagged Files in R12

    - by volker.eckardt(at)oracle.com
    Let me, based on my previous blog, explain the procedure of flagged files a bit better and facilitate the same with screenshots. Flagged files is a concept within the Oracle eBusiness Suite (EBS) release 12, where you flag a standard deployment file, let’s say a Forms file, a Package or a Java class file. When you run the patch analyse, the list of flagged files will be checked and in case one of these files gets patched, the analyse report will tell you. Note: This functionality is also available in release 11, here it is implemented and known as “applcust.txt”. You can flag as many files as you want, in whatever relationship they are with your customizations. In addition to the flag itself you can add a comment. You should use this comment to point to your customization reference (here XXAR_RPT_066 or XXAP_CUST_030). Consider the following two cases: You have created your own report, based on a standard report. In this case you will flag the report file itself, and the key views used. When a patch updates one of these files, you will be informed and can initiate a proper review and testing. (ex.: first line for ARXCTA.rdf) You have created an extensive personalization and because it is business critical you like to be informed if the page definition gets updated. In this case you register the PG.xml file as flagged file. (ex.: second line below for CreateExtBankAcctPG.xml) The menu path to register flagged files is the following: (R) System Administrator > (M) Oracle Applications Manager > Site Map > Maintenance > Register Flagged Files     Your DBA should now run the Patch Analyse every time he is going to apply a new patch. (R) System Administrator > (M) Oracle Applications Manager > Patch Wizard > Task “Recommend/Analyze Patches” The screenshot above shows the impact summary. For this blog entry the number “2” titled “Flagged Files Changed“ is in our focus. When you click the “2” you will get a similar screen like the first in this blog, showing you exactly the files which will get patched if you continue and apply this patch in this environment right now. Note: It is also shown that just 20% of all patch files will get applied. This situation might be different in case your environments are on a different patch level. For sure also the customization impact might then be different. The flagging step can be done directly in the Oracle Applications Manager.  Our developers are responsible for. To transport such a flag+comment we use a FNDLOAD script. It is suggested to put the flagged files data file directly into your CEMLI patch. Herewith the flagged files registration will be executed right at the same time when the patch gets applied. Process Steps: Developer: Builds CEMLI Reviews code and identifies key standard objects referenced Determines standard object files and flags them Creates FNDLOAD file and adds the same to the CEMLI patch DBA: Executes for every new Oracle standard patch the patch analyse in a representative environment Checks and retrieves the flagged files and comments Sends flagged file list back to development team for analyse / retest Developer: Analyses / Updates / Retests effected CEMLIs Prerequisite: The patch analyse has to be executed in an environment where flagged files have been registered. (If you run the patch analyse in a vanilla or outdated environment (compared to your PROD), the analyse will not be so helpful!) When to start with Flagged files? Start right now utilizing this feature. It is an invest to improve the production stability and fulfil your SLA!   Summary Flagged Files is a very helpful EBS R12 technique when analysing patches. Implement a procedure within your development process to maintain such flags. Let the DBA run the patch analyse in an environment with a similar patch and customization level as your current production.   Related Links: EBS Patching Procedures - Chapter 2-13 - Registered Flagged Files

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  • What Counts For a DBA: Replaceable

    - by Louis Davidson
    Replaceable is what every employee in every company instinctively strives not to be. Yet, if you’re an irreplaceable DBA, meaning that the company couldn’t find someone else who could do what you do, then you’re not doing a great job. A good DBA is replaceable. I imagine some of you are already reaching for the lighter fluid, about to set the comments section ablaze, but before you destroy a perfectly good Commodore 64, read on… Everyone is replaceable, ultimately. Anyone, anywhere, in any job, could be sitting at their desk reading this, blissfully unaware that this is to be their last day at work. Morbidly, you could be about to take your terminal breath. Ideally, it will be because another company suddenly offered you a truck full of money to take a new job, forcing you to bid a regretful farewell to your current employer (with barely a “so long suckers!” left wafting in the air as you zip out of the office like the Wile E Coyote wearing two pairs of rocket skates). I’ve often wondered what it would be like to be present at the meeting where your former work colleagues discuss your potential replacement. It is perhaps only at this point, as they struggle with the question “What kind of person do we need to replace old Wile?” that you would know your true worth in their eyes. Of course, this presupposes you need replacing. I’ve known one or two people whose absence we adequately compensated with a small rock, to keep their old chair from rolling down a slight incline in the floor. On another occasion, we bought a noise-making machine that frequently attracted attention its way, with unpleasant sounds, but never contributed anything worthwhile. These things never actually happened, of course, but you take my point: don’t confuse replaceable with expendable. Likewise, if the term “trained seal” comes up, someone they can teach to follow basic instructions and push buttons in the right order, then the replacement discussion is going to be over quickly. What, however, if your colleagues decide they’ll need a super-specialist to replace you. That’s a good thing, right? Well, usually, in my experience, no it is not. It often indicates that no one really knows what you do, or how. A typical example is the “senior” DBA who built a system just before 16-bit computing became all the rage and then settled into a long career managing it. Such systems are often central to the company’s operations and the DBA very skilled at what they do, but almost impossible to replace, because the system hasn’t evolved, and runs on processes and routines that others no longer understand or recognize. The only thing you really want to hear, at your replacement discussion, is that they need someone skilled at the fundamentals and adaptable. This means that the person they need understands that their goal is to be an excellent DBA, not a specialist in whatever the-heck the company does. Someone who understands the new versions of SQL Server and can adapt the company’s systems to the way things work today, who uses industry standard methods that any other qualified DBA/programmer can understand. More importantly, this person rarely wants to get “pigeon-holed” and so documents and shares the specialized knowledge and responsibilities with their teammates. Being replaceable doesn’t mean being “dime a dozen”. The company might need four people to take your place due to the depth of your skills, but still, they could find those replacements and those replacements could step right in using techniques that any decent DBA should know. It is a tough question to contemplate, but take some time to think about the sort of person that your colleagues would seek to replace you. If you think they would go looking for a “super-specialist” then consider urgently how you can diversify and share your knowledge, and start documenting all the processes you know as if today were your last day, because who knows, it just might be.

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  • Review&ndash;Build Android and iOS apps in Visual Studio with Nomad

    - by Bill Osuch
    Nomad is a Visual Studio extension that allows you build apps for both Android and iOS platforms in Visual Studio using HTML5. There is no need to switch between .Net, Java and Objective-C to target different platforms - write your code once in HTML5 and build for all common mobile platforms and tablets. You have access to the native hardware functions (such as camera and GPS) through the PhoneGap library, UI libraries such as jQuery mobile allow you to create an impressive UI with minimal work. Nomad is still in an early access beta stage, so the documentation is a bit sparse. In fact, the only documentation is a simple series of steps on how to install the plug-in, set up a project, build and deploy it. You're going to want to be a least a little familiar with the PhoneGap library and jQuery mobile to really tap into the power of this. The sample project included with the download shows you just how simple it is to create projects in Visual Studio. The sample solution comes with an index.html file containing the HTML5 code, the Cordova (PhoneGap) library, jQuery libraries, and a JQuery style sheet: The html file is pretty straightforward. If you haven't experimented with JQuery mobile before, some of the attributes (such as data-role) might be new to you, but some quick Googling will fill in everything you need to know. The first part of the file builds a simple (but attractive) list with some links in it: The second part of the file is where things get interesting and it taps into the PhoneGap library. For instance, it gets the geolocation position by calling position.coords.latitude and position.coords.longitude: ...and then displays it in a simple span: Building is pretty simple, at least for Android (I'm not an iOS developer so I didn't look at that feature) - just configure the display name, version number, and package ID. There's no need to specify Android version; Nomad supports 2.2 and later. Enter these bits of information, click the new "Build for Android" button (not the regular Visual Studio Build link...) and you get a dialog box saying that your code is being built by their cloud build service (so no building while away from a WiFi signal apparently). After a couple minutes you wind up with a .apk file that can be copied over to your device. Applications built with Nomad for Android currently use a temporary certificate, so you can test the app on your devices but you cannot publish them in the Google Play Store (yet). And I love the "success" dialog box: Since Nomad is still in Beta, no pricing plans have been announced yet, so I'll be curious to see if this becomes a cost-effective solution to mobile app development. If it is, I may even be tempted to spring for the $99 iOS membership fee! In the meantime, I plan to work on porting some of my apps over to it and seeing how they work. My only quibble at this time is the lack of a centralized documentation location - I'd like to at least see which (if any) features of JQuery and PhoneGap are limited or not supported. Also, some notes on targeting different Android screen sizes would be nice, but it's relatively easy to find jQuery examples out on the InterWebs. Oh well, trial and error! You can download the Nomad extension for Visual Studio by going to their web site: www.vsnomad.com. Technorati Tags: Android, Nomad

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  • Java EE @ No Fluff Just Stuff Tour

    - by reza_rahman
    If you work in the US and still don't know what the No Fluff Just Stuff (NFJS) Tour is, you are doing yourself a very serious disfavor. NFJS is by far the cheapest and most effective way to stay up to date through some world class speakers and talks. This is most certainly true for US enterprise Java developers in particular. Following the US cultural tradition of old-fashioned roadshows, NFJS is basically a set program of speakers and topics offered at major US cities year round. Many now famous world class technology speakers can trace their humble roots to NFJS. Via NFJS you basically get to have amazing training without paying for an expensive venue, lodging or travel. The events are usually on the weekends so you don't need to even skip work if you want (a great feature for consultants on tight budgets and deadlines). I am proud to share with you that I recently joined the NFJS troupe. My hope is that this will help solve the lingering problem of effectively spreading the Java EE message here in the US. For NFJS I hope my joining will help beef up perhaps much desired Java content. In any case, simply being accepted into this legendary program is an honor I could have perhaps only dreamed of a few years ago. I am very grateful to Jay Zimmerman for seeing the value in me and the Java EE content. The current speaker line-up consists of the likes of Neal Ford, Venkat Subramaniam, Nathaniel Schutta, Tim Berglund and many other great speakers. I actually had my tour debut on April 4-5 with the NFJS New York Software Symposium - basically a short train commute away from my home office. The show is traditionally one of the smaller ones and it was not that bad for a start. I look forward to doing a few more in the coming months (more on that a bit later). I had four talks back to back (really my most favorite four at the moment). The first one was a talk on JMS 2 - some of you might already know JMS is one of my most favored Java EE APIs. The slides for the talk are posted below: What’s New in Java Message Service 2 from Reza Rahman The next talk I delivered was my Cargo Tracker/Java EE + DDD talk. This talk basically overviews DDD and describes how DDD maps to Java EE using code examples/demos from the Cargo Tracker Java EE Blue Prints project. Applied Domain-Driven Design Blue Prints for Java EE from Reza Rahman The third talk I delivered was our flagship Java EE 7/8 talk. As you may know, currently the talk is basically about Java EE 7. I'll probably slowly evolve this talk to gradually transform it into a Java EE 8 talk as we move forward (I'll blog about that separately shortly). The following is the slide deck for the talk: JavaEE.Next(): Java EE 7, 8, and Beyond from Reza Rahman My last talk for the show was my JavaScript+Java EE 7 talk. This talk is basically about aligning EE 7 with the emerging JavaScript ecosystem (specifically AngularJS). The slide deck for the talk is here: JavaScript/HTML5 Rich Clients Using Java EE 7 from Reza Rahman Unsurprisingly this talk was well-attended. The demo application code is posted on GitHub. The code should be a helpful resource if this development model is something that interests you. Do let me know if you need help with it but the instructions should be fairly self-explanatory. My next NFJS show is the Central Ohio Software Symposium in Columbus on June 6-8 (sorry for the late notice - it's been a really crazy few weeks). Here's my tour schedule so far, I'll keep you up-to-date as the tour goes forward: June 6 - 8, Columbus Ohio. June 24 - 27, Denver Colorado (UberConf) - my most extensive agenda on the tour so far. July 18 - 20, Austin Texas. I hope you'll take this opportunity to get some updates on Java EE as well as the other awesome content on the tour?

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  • Workflow versioning

    - by Nitra
    I believe I have a fundamental misunderstanding when it comes to workflow engines which I would appreciate if you could help me sort out. I'm not sure if my misunderstanding is specific to the workflow engine I'm using, or if it's a general misunderstanding. I happen to use Windows Workflow Foundation (WWF). TLDR-version WWF allows you to implement business processes in long-running workflows (think months or even years). When started, the workflows can't be changed. But what business process can't change at any time? And if a business process changes, wouldn't you want your software to reflect this change for already started 'instances' of the business process? What am I missing? Background In WWF you define a workflow by combining a set of activites. There are different types of activities - some of them are for flow control, such as the IfElseActivity and the WhileActivty while others allows you to perform actual tasks, such as the CodeActivity wich allows you to run .NET code and the InvokeWebServiceActivity which allows you to call web services. The activites are combined to a workflow using a visual designer. You pretty much drag-and-drop activities from a toolbox to a designer area and connect the activites to each other. The workflow and activities have input paramters, output parameters and variables. We have a single workflow which sometimes runs in a matter of a few days, but it may run for 5-6 months. WWF takes care of persisting the workflow state (what activity are we currently executing, what are the variable values and so on). So far I think WWF makes sense. Some people will prefer to implement a software representation of a business process using a visual designer over writing all of it in code. So what's the issue then? What I don't really get is the following: WWF is designed to take care of long-running workflows. But at the same time, WWF has no built-in functionality which allows you to modify the running workflows. So if you model a business process using a workflow and run that for 6 months, you better hope that the business process does not change. Because if it do, you'll have to have multiple versions of the workflow executing at the same time. This seems like a fundamental design mistake to me, but at the same time it seems more likely that I've misunderstood something. For us, this has had some real-world effects: We release new versions every month, but some workflows may run for a year. This means that we have several versions of the workflow running in parallell, in other words several versions of the business logics. This is the same as having many differnt versions of your code running in production in the same system at the same time, which becomes a bit hard to understand for users. (depending on on whether they clicked a 'Start' button 9 or 10 months ago, the software will behave differently) Our workflow refers to different types of entities and since WWF now has persisted and serialized these we can't really refactor the entities since then existing workflows can't be resumed (deserialization will fail We've received some suggestions on how to handle this When we create a new version of the workflow, cancel all running workflows and create new ones. But in our workflows there's a lot of manual work involved and if we start from scratch a lot of people has to re-do their work. Track what has been done in the workflow and when you create a new one skip activites which have already been executed. I feel that this alternative may work for simple workflows, but it becomes hairy to automatically figure out what activities to skip if there's major refactoring done to a workflow. When we create a new version of the workflow, upgrade old versions using the new WWF 4.5 functionality for upgrading workflows. But then we would have to skip using the visual designer and write code to inject activities in the right places in the workflow. According to MSDN, this upgrade functionality is only intended for minor bug fixes and not larger changes. What am I missing?

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  • How to prepare for a programming competition? Graphs, Stacks, Trees, oh my! [closed]

    - by Simucal
    Last semester I attended ACM's (Association for Computing Machinery) bi-annual programming competition at a local University. My University sent 2 teams of 3 people and we competed amongst other schools in the mid-west. We got our butts kicked. You are given a packet with about 11 problems (1 problem per page) and you have 4 hours to solve as many as you can. They'll run your program you submit against a set of data and your output must match theirs exactly. In fact, the judging is automated for the most part. In any case.. I went there fairly confident in my programming skills and I left there feeling drained and weak. It was a terribly humbling experience. In 4 hours my team of 3 people completed only one of the problems. The top team completed 4 of them and took 1st place. The problems they asked were like no problems I have ever had to answer before. I later learned that in order to solve them some of them effectively you have to use graphs/graph algorithms, trees, stacks. Some of them were simply "greedy" algo's. My question is, how can I better prepare for this semesters programming competition so I don't leave there feeling like a complete moron? What tips do you have for me to be able to answer these problems that involve graphs, trees, various "well known" algorithms? How can I easily identify the algorithm we should implement for a given problem? I have yet to take Algorithm Design in school so I just feel a little out of my element. Here are some examples of the questions asked at the competitions: ACM Problem Sets Update: Just wanted to update this since the latest competition is over. My team placed 1st for our small region (about 6-7 universities with between 1-5 teams each school) and ~15th for the midwest! So, it is a marked improvement over last years performance for sure. We also had no graduate students on our team and after reviewing the rules we found out that many teams had several! So, that would be a pretty big advantage in my own opinion. Problems this semester ranged from about 1-2 "easy" problems (ie bit manipulation, string manipulation) to hard (graph problems involving fairly complex math and network flow problems). We were able to solve 4 problems in our 5 hours. Just wanted to thank everyone for the resources they provided here, we used them for our weekly team practices and it definitely helped! Some quick tips that I have that aren't suggested below: When you are seated at your computer before the competition starts, quickly type out various data structures that you might need that you won't have access to in your languages libraries. I typed out a Graph data-structure complete with floyd-warshall and dijkstra's algorithm before the competition began. We ended up using it in our 2nd problem that we solved and this is the main reason why we solved this problem before anyone else in the midwest. We had it ready to go from the beginning. Similarly, type out the code to read in a file since this will be required for every problem. Save this answer "template" someplace so you can quickly copy/paste it to your IDE at the beginning of each problem. There are no rules on programming anything before the competition starts so get any boilerplate code out the way. We found it useful to have one person who is on permanent whiteboard duty. This is usually the person who is best at math and at working out solutions to get a head start on future problems you will be doing. One person is on permanent programming duty. Your fastest/most skilled "programmer" (most familiar with the language). This will save debugging time also. The last person has several roles between assessing the packet of problems for the next "easiest" problem, helping the person on the whiteboard work out solutions and helping the person programming work out bugs/issues. This person needs to be flexible and be able to switch between roles easily.

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  • My search what the Cloud will mean for my Work, part 2

    - by Kay Sellenrode
    My experience with the cloud and why work will change and not disappear. Until now I have multiple experiences with the cloud, for the most good. i have worked on multiple cloud solutions in the past but let me describe them as 0.x versions. For me the 1st real serious cloud experience was a bit more than 1 year ago, when our company switched from an in house server to Microsoft BPOS as a complete replacement. Since we are a small consultancy firm and don’t have that much else to do than consulting, our IT requirements are quite simple. We need Mail and Storage space for our documents. With the in house server we had multiple outages during a year, mostly by lack of administering. Being consultants in the field and hardly having time to maintain a server, BPOS was and still is for us the right solution. Since the migration we have less outages and a much more robust solution. Have we run into issues with BPOS for our own environment? No not that I’m aware of. Based on this experience I made a stance about deploy ability of BPOS and cloud solutions, they are suitable for MKB (Dutch for Medium and Small Businesses). Most Small businesses don’t have the amount of work to hire a full time it admin. Hiring a service provider to maintain their own server might be even more costly than hiring an admin. So seeing the capabilities of BPOS and the needs of most businesses I see it as a great solution that gives the business a complete Server replacement solution for a fixed price per user. resulting in a clear budget for IT spending, something most small businesses were looking for, for a long time. So right now I’m deploying BPOS with a customer, and I run into some of the Cloud 1.0 issues. In my opinion BPOS is a good working Cloud version 1.0 solution. What do I mean with 1.0? Well 1.0 is mostly a tested solution (unlike 0.x versions) but still have quite some limitations caused by too few market experience. in my opnion this is also the reason why we don’t see that much BPOS customers yet and why I think Office 365 will make a huge difference. What I have seen of 365 shows me it is a Cloud 2.0 version, meaning it has all needed features and is much more flexible to the customer. This is also why I see changes happen in my work field, changes and not unemployment due to Cloud solutions. Cloud 1.0 solutions gave me the idea that if every customer would adopt them I would be out of work. But in reality Cloud 1.0 solutions are here just to set the market needs. The Cloud 2.0 and higher versions will give the customer much more flexibility, but also require the need for a consultant. Where the 1.0 versions are simple to setup and maintain, the 2.0 solution needs more thought upfront and afterwards. ie. BPOS in its 1.0 version brings you a very simplified Exchange 2007 solution, Suitable for some customers. Looking at Office 365 you receive almost a full blown Exchange 2010 solution. I expect this to be even more customizable in the next version. In my search for the changes to my work I try to regulary write a post with my thought around the Cloud and the impact on my work as a consultant. I'm also planning to present around this topic, so if anyone is interested to see me present around this topic, you're more than welcome to contact me.

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  • First Impressions of a MacBook (from a PC guy)

    - by dgreen
    Disclaimer: I've been a PC guy my entire working career. I'd probably characterize myself as a power user. Never afraid to bust out the console line. But working with a Mac is totally foreign to me. So for those Mac guys who are curious, this is how your world appears from the outside to a computer literate person :)My Macbook Air has arrived! And it's a thing of beauty:First, the specs: 13" MacBook Air, 2.0GHz Core i7 processor. Upgraded to 8GB of RAM for an additional $100, SSD flash storage  = 256GB. The plan is ultimately to use this baby for some iOS development but also some decent lifting in Windows with Visual Studio. Done a lot of reading  and between VMWare Fusion, Parallels and Bootcamp...I'm going to go with VMWare Fusion for $49.99And now my impressions (please re-read disclaimer before proceeding!):I open the box and am trying to understand exactly how the magsafe connector works (and how to disconnect it).  Why does it have two socket outlet plugs? Who knows.  I feel like Hansel in Zoolander. The files are "in" the computer.Stuck in my external hard drive (usb). So how do I get to the files? To the Googles!Argh...it can't read my external NTFS drive. Fat32 can't support field over 4GB…problematic since some of my existing VMWare image files are much larger than 4GB. Didn't see this coming.Three year old loves iPhoto. Super easy to use. Don't even know what I'm doing but I've already (accidentally) discovered the image filtering options. Fun stuff.First thing I downloaded ever => Chrome. I need something to ground me, something familiar. My token, if you will (sorry, gratuitous Inception joke).Ok, I get it… Finder == windows explorer. But where is my hierarchical structure? I miss the tree :(On that note, yeah…how do I see what "path" my files reside in? I'm afraid to know the answer. You know what scares more though…this notion of a smart folder. Feel like the godfather - just get the job done, I don't care how you handle it, I don't want to know...just get it done. What the hell is AirDrop?Mail…just worked. Still in shock that they have a free client for yahoo mail (please no yahoo jokes).mail -> deleting a message takes 5 seconds. Have they heard of async?"Command" key instead of "Control" ok, then what the $%&^! is the control key for then"aliases" == shortcuts I thinkI don't see the file system. And I'm scared. All these things I'm downloading…these .dmg files (bad name) where are they going? Can't seem to delete when they're doneUgh...realized need to buy a mini-to-vga adaptor if I want to use my external monitor ($13 on ebay, $39 in apple store).Windows docking is trickiest for me…this notion of detached windows with a menu bar at the top. I don't like this paradigm, it's confusing. But maybe because I've been using Windows for too long.Evernote, Dropbox desktop clients seem almost identical…few quirks here and there I need to get used to.iTunes is still a bit gross. In a weird way it's actually worse on a Mac if thats possible. This is not the MacBook's fault…this is a software design issue. Overall: UI will take some getting used to. Can't decide if this represents the future and I'm stuck in the past…or this is the past and I've been spoiled by the future (which would be Windows…don't be hating I happen to be very productive in Win7)  So there you go - my 90 minute first impression of the MacBook universe.

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  • Unable to make properly work the Ralink rt3090 wifi card on my Lenovo B575 with Kubuntu 12.04 64bit

    - by Sebastien
    I look and tried many solution from many thread but I still unable to make this wifi card work properly (very slow, unable to connect to some wifi spot, etc.). I tried to compile the driver from the ralink website but it doesn't work. Tried to blacklist many mod, withou any result. So here are some command results, hope their help you help me: lspci sebastien@sebastien-portable:~$ lspci 00:00.0 Host bridge: Advanced Micro Devices [AMD] Family 14h Processor Root Complex 00:01.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Wrestler [Radeon HD 6310] 00:01.1 Audio device: Advanced Micro Devices [AMD] nee ATI Wrestler HDMI Audio [Radeon HD 6250/6310] 00:11.0 SATA controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode] 00:12.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller 00:12.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller 00:13.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller 00:13.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller 00:14.0 SMBus: Advanced Micro Devices [AMD] nee ATI SBx00 SMBus Controller (rev 42) 00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) (rev 40) 00:14.3 ISA bridge: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 LPC host controller (rev 40) 00:14.4 PCI bridge: Advanced Micro Devices [AMD] nee ATI SBx00 PCI to PCI Bridge (rev 40) 00:14.5 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI2 Controller 00:15.0 PCI bridge: Advanced Micro Devices [AMD] nee ATI SB700/SB800/SB900 PCI to PCI bridge (PCIE port 0) 00:15.2 PCI bridge: Advanced Micro Devices [AMD] nee ATI SB900 PCI to PCI bridge (PCIE port 2) 00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 0 (rev 43) 00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 1 00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 2 00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 3 00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 4 00:18.5 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 6 00:18.6 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 5 00:18.7 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 7 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06) 03:00.0 Network controller: Ralink corp. RT3090 Wireless 802.11n 1T/1R PCIe lsmod sebastien@sebastien-portable:~$ lsmod Module Size Used by rt2800pci 18715 0 arc4 12529 2 rt2800lib 58925 1 rt2800pci crc_ccitt 12667 1 rt2800lib rt2x00pci 14577 1 rt2800pci rt2x00lib 55301 3 rt2800pci,rt2800lib,rt2x00pci mac80211 506816 3 rt2800lib,rt2x00pci,rt2x00lib cfg80211 205544 2 rt2x00lib,mac80211 eeprom_93cx6 12725 1 rt2800pci rt2860sta 864748 0 snd_hda_codec_conexant 62128 1 snd_hda_codec_hdmi 32474 1 uvcvideo 72627 0 rts5139 351143 0 snd_hda_intel 33773 4 videodev 98259 1 uvcvideo snd_hda_codec 127706 3 snd_hda_codec_conexant,snd_hda_codec_hdmi,snd_hda_intel snd_hwdep 13668 1 snd_hda_codec psmouse 87692 0 v4l2_compat_ioctl32 17128 1 videodev serio_raw 13211 0 k10temp 13166 0 snd_pcm 97188 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec sp5100_tco 13791 0 i2c_piix4 13301 0 snd_seq_midi 13324 0 snd_rawmidi 30748 1 snd_seq_midi ideapad_laptop 18234 0 sparse_keymap 13890 1 ideapad_laptop rfcomm 47604 0 joydev 17693 0 snd_seq_midi_event 14899 1 snd_seq_midi bnep 18281 2 bluetooth 180104 10 rfcomm,bnep parport_pc 32866 0 ppdev 17113 0 snd_seq 61896 2 snd_seq_midi,snd_seq_midi_event snd_timer 29990 2 snd_pcm,snd_seq snd_seq_device 14540 3 snd_seq_midi,snd_rawmidi,snd_seq snd 78855 18 snd_hda_codec_conexant,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device soundcore 15091 1 snd mac_hid 13253 0 snd_page_alloc 18529 2 snd_hda_intel,snd_pcm lp 17799 0 parport 46562 3 parport_pc,ppdev,lp usbhid 47199 0 hid 99559 1 usbhid r8169 62099 0 radeon 804372 4 video 19596 0 wmi 19256 0 ttm 76949 1 radeon drm_kms_helper 46978 1 radeon drm 242038 6 radeon,ttm,drm_kms_helper i2c_algo_bit 13423 1 radeon iwconfig sebastien@sebastien-portable:~$ iwconfig lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"4CE6763F0E0A" Mode:Managed Frequency:2.452 GHz Access Point: 4C:E6:76:3F:0E:0A Bit Rate=54 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=70/70 Signal level=-39 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:100 Missed beacon:0 eth0 no wireless extensions.

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  • Insurers Pushed to Transform Their Business

    - by Calvin Glenn
    Everyone in the P&C industry has heard it “We can’t do it.” “Nobody wants to do it.” “We can’t afford to do it.”  Unfortunately, what they’re referencing are the reasons many insurers are still trying to maintain their business processing on legacy policy administration systems, attempting to bide time until there is no other recourse but to give in, bite the bullet, and take on the monumental task of replacing an entire policy administration system (PAS). Just the thought of that project sends IT, Business Users and Management reeling. However, is that fear real?  It is a bit daunting when one realizes that a complete policy administration system replacement will touch most every function an insurer manages, from quoting and rating, to underwriting, distribution, and even customer service. With that, everyone has heard at least one horror story around a transformation initiative that has far exceeded budget and the promised implementation / go-live timeline.    But, does it have to be that hard?  Surely, in the age where a person can voice-activate their DVR to record a TV program from a cell phone, there has to be someone somewhere who’s figured out how to simplify this process. To be able to help insurers, of all sizes, transform and grow their business while also delivering on their overall objectives of providing speed to market, straight-through-processing for applications, quoting, underwriting, and simplified product development. Maybe we’re looking too hard and the answer is simple and straight-forward. Why replace the entire machine when all it really needs is a new part…a single enterprise rating system? This core, modular piece of the policy administration system is the foundation of product development and rate management that enables insurers to provide the right product at the right price to the right customer through the best channels at any given moment in time. The real benefit of a single enterprise rating system is the ability to deliver enhanced business capabilities, such as improved product management, streamlined underwriting, and speed to market. With these benefits, carriers have accomplished a portion of their overall transformation goal. Furthermore, lessons learned from the rating project can be applied to the bigger, down-the-road PAS project to support the successful completion of the overall transformation endeavor. At the recent Oracle OpenWorld Conference in San Francisco, information was shared with attendees about a recent “go-live” project from an Oracle Insurance Tier 1 insurer who did what is proposed above…replaced just the rating portion of their legacy policy administration system with Oracle Insurance Insbridge Rating and Underwriting.  This change provided the insurer greater flexibility to set rates that better reflect risk while enabling the company to support its market segment strategy. Using the Oracle Insurance Insbridge enterprise rating solution, the insurer was able to reduce processing time for agents and underwriters, gained the ability to support proprietary rating models and improved pricing accuracy.      There is mounting pressure on P&C insurers to produce growth and show net profitability in the midst of modest overall industry growth, large weather-related losses and intensifying competition for market share.  Insurers are also being asked to improve customer service, offer a differentiated value proposition and simplify insurance processes.  While the demands are many there is an easy answer…invest in and update the most mission critical application in your arsenal, the single enterprise rating system. Download the Podcast to listen to “Stand-Alone Rating Engine - Leading Force Behind Core Transformation Projects in the P&C Market,” a podcast originally recorded in October 2013. Related Resources: White Paper: Stand-Alone Rating Engine: Leading Force Behind Core Transformation Projects in the P&C Market Webcast On Demand: Stand-Alone Rating Engine and Core Transformation for P&C Insurers Don’t forget to keep up with us year-round: Facebook: www.facebook.com/oracleinsurance Twitter: www.twitter.com/oracleinsurance YouTube: www.youtube.com/oracleinsurance

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  • Lessons Building KeyRef (a .NET developer learning Rails)

    - by Liam McLennan
    Just because I like to build things, and I like to learn, I have been working on a keyboard shortcut reference site. I am using this as an opportunity to improve my ruby and rails skills. The first few days were frustrating. Perhaps the learning curve of all the fun new toys was a bit excessive. Finally tonight things have really started to come together. I still don’t understand the rails built-in testing support but I will get there. Interesting Things I Learned Tonight RubyMine IDE Tonight I switched to RubyMine instead of my usual Notepad++. I suspect RubyMine is a powerful tool if you know how to use it – but I don’t. At the moment it gives me errors about some gems not being activated. This is another one of those things that I will get to. I have also noticed that the editor functions significantly differently to the editors I am used to. For example, in visual studio and notepad++ if you place the cursor at the start of a line and press left arrow the cursor is sent to the end of the previous line. In RubyMine nothing happens. Haml Haml is my favourite view engine. For my .NET work I have been using its non-union Mexican CLR equivalent – nHaml. Multiple CSS Classes To define a div with more than one css class haml lets you chain them together with a ‘.’, such as: .span-6.search_result contents of the div go here Indent Consistency I also learnt tonight that both haml and nhaml complain if you are not consistent about indenting. As a consequence of the move from notepad++ to RubyMine my haml views ended up with some tab indenting and some space indenting. For the view to render all of the indents within a view must be consistent. Sorting Arrays I guessed that ruby would be able to sort an array alphabetically by a property of the elements so my first attempt was: Application.all.sort {|app| app.name} which does not work. You have to supply a comparer (much like .NET). The correct sort is: Application.all.sort {|a,b| a.name.downcase <=> b.name.downcase} MongoMapper Find by Id Since document databases are just fancy key-value stores it is essential to be able to easily search for a document by its id. This functionality is so intrinsic that it seems that the MongoMapper author did not bother to document it. To search by id simply pass the id to the find method: Application.find(‘4c19e8facfbfb01794000002’) Rails And CoffeeScript I am a big fan of CoffeeScript so integrating it into this application is high on my priorities. My first thought was to copy Dr Nic’s strategy. Unfortunately, I did not get past step 1. Install Node.js. I am doing my development on Windows and node is unix only. I looked around for a solution but eventually had to concede defeat… for now. Quicksearch The front page of the application I am building displays a list of applications. When the user types in the search box I want to reduce the list of applications to match their search. A quick googlebing turned up quicksearch, a jquery plugin. You simply tell quicksearch where to get its input (the search textbox) and the list of items to filter (the divs containing the names of applications) and it just works. Here is the code: $('#app_search').quicksearch('.search_result'); Summary I have had a productive evening. The app now displays a list of applications, allows them to be sorted and links through to an application page when an application is selected. Next on the list is to display the set of keyboard shortcuts for an application.

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  • Building on someone else's DefaultButton Silverlight work...

    - by KyleBurns
    This week I was handed a "simple" requirement - have a search screen execute its search when the user pressed the Enter key instead of having to move hands from keyboard to mouse and click Search.  That is a reasonable request that has been met for years both in Windows and Web apps.  I did a quick scan for code to pilfer and found Patrick Cauldwell's Blog posting "A 'Default Button' In Silverlight".  This posting was a great start and I'm glad that the basic work had been done for me, but I ran into one issue - when using bound textboxes (I'm a die-hard MVVM enthusiast when it comes to Silverlight development), the search was being executed before the textbox I was in when the Enter key was pressed updated its bindings.  With a little bit of reflection work, I think I have found a good generic solution that builds upon Patrick's to make it more binding-friendly.  Also, I wanted to set the DefaultButton at a higher level than on each TextBox (or other control for that matter), so the use of mine is intended to be set somewhere such as the LayoutRoot or other high level control and will apply to all controls beneath it in the control tree.  I haven't tested this on controls that treat the Enter key special themselves in the mix. The real change from Patrick's solution here is that in the KeyUp event, I grab the source of the KeyUp event (in my case the textbox containing search criteria) and loop through the static fields on the element's type looking for DependencyProperty instances.  When I find a DependencyProperty, I grab the value and query for bindings.  Each time I find a binding, UpdateSource is called to make sure anything bound to any property of the field has the opportunity to update before the action represented by the DefaultButton is executed. Here's the code: public class DefaultButtonService { public static DependencyProperty DefaultButtonProperty = DependencyProperty.RegisterAttached("DefaultButton", typeof (Button), typeof (DefaultButtonService), new PropertyMetadata (null, DefaultButtonChanged)); private static void DefaultButtonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var uiElement = d as UIElement; var button = e.NewValue as Button; if (uiElement != null && button != null) { uiElement.KeyUp += (sender, arg) => { if (arg.Key == Key.Enter) { var element = arg.OriginalSource as FrameworkElement; if (element != null) { UpdateBindings(element); } if (button.IsEnabled) { button.Focus(); var peer = new ButtonAutomationPeer(button); var invokeProv = peer.GetPattern(PatternInterface.Invoke) as IInvokeProvider; if (invokeProv != null) invokeProv.Invoke(); arg.Handled = true; } } }; } } public static DefaultButtonService GetDefaultButton(UIElement obj) { return (DefaultButtonService) obj.GetValue(DefaultButtonProperty); } public static void SetDefaultButton(DependencyObject obj, DefaultButtonService button) { obj.SetValue(DefaultButtonProperty, button); } public static void UpdateBindings(FrameworkElement element) { element.GetType().GetFields(BindingFlags.Public | BindingFlags.Static).ForEach(field => { if (field.FieldType.IsAssignableFrom(typeof(DependencyProperty))) { try { var dp = field.GetValue(null) as DependencyProperty; if (dp != null) { var binding = element.GetBindingExpression(dp); if (binding != null) { binding.UpdateSource(); } } } // ReSharper disable EmptyGeneralCatchClause catch (Exception) // ReSharper restore EmptyGeneralCatchClause { // swallow exceptions } } }); } }

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  • How would I handle input with a Game Component?

    - by Aufziehvogel
    I am currently having problems from finding my way into the component-oriented XNA design. I read an overview over the general design pattern and googled a lot of XNA examples. However, they seem to be right on the opposite site. In the general design pattern, an object (my current player) is passed to InputComponent::update(Player). This means the class will know what to do and how this will affect the game (e.g. move person vs. scroll text in a menu). Yet, in XNA GameComponent::update(GameTime) is called automatically without a reference to the current player. The only XNA examples I found built some sort of higher-level Keyboard engine into the game component like this: class InputComponent: GameComponent { public void keyReleased(Keys); public void keyPressed(Keys); public bool keyDown(Keys); public void override update(GameTime gameTime) { // compare previous state with current state and // determine if released, pressed, down or nothing } } Some others went a bit further making it possible to use a Service Locator by a design like this: interface IInputComponent { public void downwardsMovement(Keys); public void upwardsMovement(Keys); public bool pausedGame(Keys); // determine which keys pressed and what that means // can be done for different inputs in different implementations public void override update(GameTime); } Yet, then I am wondering if it is possible to design an input class to resolve all possible situations. Like in a menu a mouse click can mean "click that button", but in game play it can mean "shoot that weapon". So if I am using such a modular design with game components for input, how much logic is to be put into the InputComponent / KeyboardComponent / GamepadComponent and where is the rest handled? What I had in mind, when I heard about Game Components and Service Locator in XNA was something like this: use Game Components to run the InputHandler automatically in the loop use Service Locator to be able to switch input at runtime (i.e. let player choose if he wants to use a gamepad or a keyboard; or which shall be player 1 and which player 2). However, now I cannot see how this can be done. First code example does not seem flexible enough, as on a game pad you could require some combination of buttons for something that is possible on keyboard with only one button or with the mouse) The second code example seems really hard to implement, because the InputComponent has to know in which context we are currently. Moreover, you could imagine your application to be multi-layered and let the key-stroke go through all layers to the bottom-layer which requires a different behaviour than the InputComponent would have guessed from the top-layer. The general design pattern with passing the Player to update() does not have a representation in XNA and I also cannot see how and where to decide which class should be passed to update(). At most time of course the player, but sometimes there could be menu items you have to or can click I see that the question in general is already dealt with here, but probably from a more elobate point-of-view. At least, I am not smart enough in game development to understand it. I am searching for a rather code-based example directly for XNA. And the answer there leaves (a noob like) me still alone in how the object that should receive the detected event is chosen. Like if I have a key-up event, should it go to the text box or to the player?

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  • T-SQL (SCD) Slowly Changing Dimension Type 2 using a merge statement

    - by AtulThakor
    Working on stored procedure recently which loads records into a data warehouse I found that the existing record was being expired using an update statement followed by an insert to add the new active record. Playing around with the merge statement you can actually expire the current record and insert a new record within one clean statement. This is how the statement works, we do the normal merge statement to insert a record when there is no match, if we match the record we update the existing record by expiring it and deactivating. At the end of the merge statement we use the output statement to output the staging values for the update,  we wrap the whole merge statement within an insert statement and add new rows for the records which we inserted. I’ve added the full script at the bottom so you can paste it and play around.   1: INSERT INTO ExampleFactUpdate 2: (PolicyID, 3: Status) 4: SELECT -- these columns are returned from the output statement 5: PolicyID, 6: Status 7: FROM 8: ( 9: -- merge statement on unique id in this case Policy_ID 10: MERGE dbo.ExampleFactUpdate dp 11: USING dbo.ExampleStag s 12: ON dp.PolicyID = s.PolicyID 13: WHEN NOT MATCHED THEN -- when we cant match the record we insert a new record record and this is all that happens 14: INSERT (PolicyID,Status) 15: VALUES (s.PolicyID, s.Status) 16: WHEN MATCHED --if it already exists 17: AND ExpiryDate IS NULL -- and the Expiry Date is null 18: THEN 19: UPDATE 20: SET 21: dp.ExpiryDate = getdate(), --we set the expiry on the existing record 22: dp.Active = 0 -- and deactivate the existing record 23: OUTPUT $Action MergeAction, s.PolicyID, s.Status -- the output statement returns a merge action which can 24: ) MergeOutput -- be insert/update/delete, on our example where a record has been updated (or expired in our case 25: WHERE -- we'll filter using a where clause 26: MergeAction = 'Update'; -- here   Complete source for example 1: if OBJECT_ID('ExampleFactUpdate') > 0 2: drop table ExampleFactUpdate 3:  4: Create Table ExampleFactUpdate( 5: ID int identity(1,1), 3: go 6: PolicyID varchar(100), 7: Status varchar(100), 8: EffectiveDate datetime default getdate(), 9: ExpiryDate datetime, 10: Active bit default 1 11: ) 12:  13:  14: insert into ExampleFactUpdate( 15: PolicyID, 16: Status) 17: select 18: 1, 19: 'Live' 20:  21: /*Create Staging Table*/ 22: if OBJECT_ID('ExampleStag') > 0 23: drop table ExampleStag 24: go 25:  26: /*Create example fact table */ 27: Create Table ExampleStag( 28: PolicyID varchar(100), 29: Status varchar(100)) 30:  31: --add some data 32: insert into ExampleStag( 33: PolicyID, 34: Status) 35: select 36: 1, 37: 'Lapsed' 38: union all 39: select 40: 2, 41: 'Quote' 42:  43: select * 44: from ExampleFactUpdate 45:  46: select * 47: from ExampleStag 48:  49:  50: INSERT INTO ExampleFactUpdate 51: (PolicyID, 52: Status) 53: SELECT -- these columns are returned from the output statement 54: PolicyID, 55: Status 56: FROM 57: ( 58: -- merge statement on unique id in this case Policy_ID 59: MERGE dbo.ExampleFactUpdate dp 60: USING dbo.ExampleStag s 61: ON dp.PolicyID = s.PolicyID 62: WHEN NOT MATCHED THEN -- when we cant match the record we insert a new record record and this is all that happens 63: INSERT (PolicyID,Status) 64: VALUES (s.PolicyID, s.Status) 65: WHEN MATCHED --if it already exists 66: AND ExpiryDate IS NULL -- and the Expiry Date is null 67: THEN 68: UPDATE 69: SET 70: dp.ExpiryDate = getdate(), --we set the expiry on the existing record 71: dp.Active = 0 -- and deactivate the existing record 72: OUTPUT $Action MergeAction, s.PolicyID, s.Status -- the output statement returns a merge action which can 73: ) MergeOutput -- be insert/update/delete, on our example where a record has been updated (or expired in our case 74: WHERE -- we'll filter using a where clause 75: MergeAction = 'Update'; -- here 76:  77:  78: select * 79: from ExampleFactUpdate 80: 

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  • DataContractSerializer: type is not serializable because it is not public?

    - by Michael B. McLaughlin
    I recently ran into an odd and annoying error when working with the DataContractSerializer class for a WP7 project. I thought I’d share it to save others who might encounter it the same annoyance I had. So I had an instance of  ObservableCollection<T> that I was trying to serialize (with T being a class I wrote for the project) and whenever it would hit the code to save it, it would give me: The data contract type 'ProjectName.MyMagicItemsClass' is not serializable because it is not public. Making the type public will fix this error. Alternatively, you can make it internal, and use the InternalsVisibleToAttribute attribute on your assembly in order to enable serialization of internal members - see documentation for more details. Be aware that doing so has certain security implications. This, of course, was malarkey. I was trying to write an instance of MyAwesomeClass that looked like this: [DataContract] public class MyAwesomeClass { [DataMember] public ObservableCollection<MyMagicItemsClass> GreatItems { get; set; }   [DataMember] public ObservableCollection<MyMagicItemsClass> SuperbItems { get; set; }     public MyAwesomeClass { GreatItems = new ObservableCollection<MyMagicItemsClass>(); SuperbItems = new ObservableCollection<MyMagicItemsClass>(); } }   That’s all well and fine. And MyMagicItemsClass was also public with a parameterless public constructor. It too had DataContractAttribute applied to it and it had DataMemberAttribute applied to all the properties and fields I wanted to serialize. Everything should be cool, but it’s not because I keep getting that “not public” exception. I could tell you about all the things I tried (generating a List<T> on the fly to make sure it wasn’t ObservableCollection<T>, trying to serialize the the Collections directly, moving it all to a separate library project, etc.), but I want to keep this short. In the end, I remembered my the “Debug->Exceptions…” VS menu option that brings up the list of exception-related circumstances under which the Visual Studio debugger will break. I checked the “Thrown” checkbox for “Common Language Runtime Exceptions”, started the project under the debugger, and voilà: the true problem revealed itself. Some of my properties had fairly elaborate setters whose logic I wanted to ignore. So for some of them, I applied an IgnoreDataMember attribute to them and applied the DataMember attribute to the underlying fields instead. All of which, in line with good programming practices, were private. Well, it just so happens that WP7 apps run in a “partial trust” environment and outside of “full trust”-land, DataContractSerializer refuses to serialize or deserialize non-public members. Of course that exception was swallowed up internally by .NET so all I ever saw was that bizarre message about things that I knew for certain were public being “not public”. I changed all the private fields I was serializing to public and everything worked just fine. In hindsight it all makes perfect sense. The serializer uses reflection to build up its graph of the object in order to write it out. In partial trust, you don’t want people using reflection to get at non-public members of an object since there are potential security problems with allowing that (you could break out of the sandbox pretty quickly by reflecting and calling the appropriate methods and cause some havoc by reflecting and setting the appropriate fields in certain circumstances. The fact that you cannot reflect your own assembly seems a bit heavy-handed, but then again I’m not a compiler writer or a framework designer and I have no idea what sorts of difficulties would go into allowing that from a compilation standpoint or what sorts of security problems allowing that could present (if any). So, lesson learned. If you get an incomprehensible exception message, turn on break on all thrown exceptions and try running it again (it might take a couple of tries, depending) and see what pops out. Chances are you’ll find the buried exception that actually explains what was going on. And if you’re getting a weird exception when trying to use DataContractSerializer complaining about public types not being public, chances are you’re trying to serialize a private or protected field/property.

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