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What is the R Language?

- by TATWORTH

I encountered the R Language recently with O'Reilly books and while from the context I knew it was a language for dealing with statistics, doing a web search for the support web site was futile. However I have now located the web site and it is at http://www.r-project.org/R is a free language available for a number of platforms including windows. CRAN mirrors are available at a number of locations worldwide.Here is the official description:"R is a language and environment for statistical computing and graphics. It is a GNU project which is similar to the S language and environment which was developed at Bell Laboratories (formerly AT&T, now Lucent Technologies) by John Chambers and colleagues. R can be considered as a different implementation of S. There are some important differences, but much code written for S runs unaltered under R. R provides a wide variety of statistical (linear and nonlinear modelling, classical statistical tests, time-series analysis, classification, clustering, ...) and graphical techniques, and is highly extensible. The S language is often the vehicle of choice for research in statistical methodology, and R provides an Open Source route to participation in that activity. One of R's strengths is the ease with which well-designed publication-quality plots can be produced, including mathematical symbols and formulae where needed. Great care has been taken over the defaults for the minor design choices in graphics, but the user retains full control. R is available as Free Software under the terms of the Free Software Foundation's GNU General Public License in source code form. It compiles and runs on a wide variety of UNIX platforms and similar systems (including FreeBSD and Linux), Windows and MacOS."

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What is the standard technique for shifting the frames of a sprite according to user input?

- by virtual__

From my own experience, I developed two techniques for changing the sprites of a character that's reacting to user input -- this in the context of a classic 2D platformer. The first one is to store all character's pixmaps in a list, putting the index of the currently used pixmap in an ordinary variable. This way, every time the player presses a key -- say the right arrow for moving the character forward -- the graphics engine sees what's the next pixmap to draw, draws it, and increments the index counter. That's a pretty common approach I believe, the problem is that in this case the animation's quality depends not only on the number of sprites available but also on how often your engine listens to user input. The second technique is to actually play an animation every key press event. For this you can use any sort of animation framework you want. It's only necessary to set the timer, the animation steps and to call the animation's play() method on your key press event handler. The problem with that approach is that is lacks responsiveness, since the character won't react to any input while the current animation is still being played. What I want to know is whether you are using one of these techniques -- or something similar -- in your games, or whether there's a standard method for animating sprites out there that's widely known by everybody but me.

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List all BPM Processes for a user

- by kasriniv

Hello, Happy to start contributing to this blog.. The title of the blog is probably deceptively simple and warrants an elaboration. Customized BPM workspaces/user interfaces are a fairly common requirement. One of our marquee customers in the online stock trading business, envisioned this user interaction for their BPM application: User logs in to the internal portal Use will have list of roles which he is granted as a drop down list Once user selects the role, a list of processes which user is part of appear. Logged in user can be part of any swimlane role of the process This can be a fairly common/reasonable user-UI interaction pattern. 1. and 2. are easily achievable and hence the subject matter of this blog is the requirement in 3. Objective: Given a username and a role, list all the BPM processes that the user is part of, in any swimlane of any process. Here is quick overview of the major steps/logic in the code: Intialize workflow/BPM context as usual Get a handle on InstanceQueryService(getInstanceQueryService), InstanceManagementService, ProcessMetadataService and ProcessModelService List all Processes for that bpmcontext (listProcessMetadataSumary) and get Granted roles to that user For each of the processes [method getAccessibleProcesss(ProcessMetadataSummary, Set)]for each of the lanes in the process, check if the role granted to the user, matches the roleName for that swimlane. If so, add to output. Notes: The usual caveats apply including BPM APIs are subject to change. JDeveloper method introspection is your better friend than API documentation :-)... (I am going to try upload the source code and if it doesnt work, will follow this blog up with the corresponding source code.) Hope this helps. Ack: Yogesh K, BPM Dev team.

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Are DDD Aggregates really a good idea in a Web Application?

- by Mystere Man

I'm diving in to Domain Driven Design and some of the concepts i'm coming across make a lot of sense on the surface, but when I think about them more I have to wonder if that's really a good idea. The concept of Aggregates, for instance makes sense. You create small domains of ownership so that you don't have to deal with the entire domain model. However, when I think about this in the context of a web app, we're frequently hitting the database to pull back small subsets of data. For instance, a page may only list the number of orders, with links to click on to open the order and see its order id's. If i'm understanding Aggregates right, I would typically use the repository pattern to return an OrderAggregate that would contain the members GetAll, GetByID, Delete, and Save. Ok, that sounds good. But... If I call GetAll to list all my order's, it would seem to me that this pattern would require the entire list of aggregate information to be returned, complete orders, order lines, etc... When I only need a small subset of that information (just header information). Am I missing something? Or is there some level of optimization you would use here? I can't imagine that anyone would advocate returning entire aggregates of information when you don't need it. Certainly, one could create methods on your repository like GetOrderHeaders, but that seems to defeat the purpose of using a pattern like repository in the first place. Can anyone clarify this for me?

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How to enable a Web portal-based rich enterprise platform on different domains and hosts using JS without customization/ server configuration

- by S.Jalali

Our company Coscend has built a Web portal-based communications and cloud collaboration platform by using JavaScript (JS), which is embedded in HTML5 and formatted with CSS3. Other technologies used in the core code include Flash, Flex, PostgreSQL and MySQL. Our team would like to host this platform on five different Windows and Linux environments that run different types of Web servers such as IIS and Apache. Technical challenge: Each of these Windows and Linux servers have a different host name and domain name (and IP address), but we would like to keep our enterprise platform independent of host server configuration. Possible approach to solution: We think an API (interface module with a GUI) is needed to accomplish this level of modularity and flexibility while deploying at our enterprise customers. Seeking your insights: In this context, our team would appreciate your guidance on: Is there an algorithmic method to implement this Web portal-based platform in these Windows and Linux environments while separating it from server configuration, i.e., customizing the host name, domain name and IP address for each individual instance? For example, would it be suitable to create some JS variables / objects for host name and domain name and call them in the different implementations? If a reference to the host/domain names occurs on hundreds of portal modules, these variables or JS objects would replace that. If so, what is the best way to make these object modules written in JS portable and re-usable across different environments and instances for enterprise customers? Here is an example of the implemented code for the said platform. The following Web site (www.CoscendCommunications.com) was built using this enterprise collaboration platform and has the base code examples of the platform. This Web site is domain-specific. We like to make the underlying platform such that it is domain and host-independent. This will allow the underlying platform to be deployed in multiple instances of our enterprise customers.

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What exactly is bootstrap admin-template and how it is supposed to be used

- by Leron

So this is my second ASP.NET MVC 4 project. It's decided that for this one we will use this template and it was said in a way that I felt really stupid for not knowing how exactly this template will help us and what exactly we gain by using it. I'm used to using HTML/CSS for the UI combined with jQuery. Now it seems that instead of jQuery we will be using bootstrap which as far as I understand is just another JS library created from twitter, so if that's it then this part is clear. What I really need to clarify for myself is what exactly this theme is used for, what is offering, why one would want to use such a theme? From what I see in the live demo maybe it's just a stack of premade controls that you can use in the front end along with bootstrap.js and maybe I'm just confused because on the page is shown as much as possible just for presentational purposes. If that's right, still I wonder where I can find info for the current theme, the controls that it offers and the functionality that I get and not least - how to use it. But still those are just my assumptions. What I really need is a clarification on what exactly is this theme for, what is the advantage using it, is there a good tutorials about how to use such themes in the context of ASP.NET MVC 3+. Also any additional info about this theme and generally on using themes in ASP.NET MVC will be much appreciated.

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What tools and knowledge do I need to create an application which generates bespoke automated e-mails? [on hold]

- by Seraphina

I'd like some suggestions as to how to best go about creating an application which can generate bespoke automated e-mails- i.e. send a personalized reply to a particular individual, interpreting the context of the message as intelligently as possible... (This is perhaps too big a question to be under one title?) What would be a good starting point? What concepts do I need to know? I'd imagine that the program needs to be able trawl through e-mails as and when they come in, and search for keywords in e-mail content, in order to write an appropriate reply. So there needs to be some form of automated response embedded in the code. Machine learning and databases come to mind here, as I'm aware that google incorporates machine learning already in gmail etc. It is quite tricky to google the above topic, and find the perfect tutorial. But there are some interesting articles and papers out there: Machine Learning in Automated Text Categorization (2002) by Fabrizio Sebastiani , Consiglio Nazionale Delle Ricerche However, this is not exactly a quick start guide. I intend to add to this question, and no doubt other questions will spark off this one. I look forward to suggestions.

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JEditorPane on Steroids with Nashorn

- by Geertjan

Continuing from Embedded Nashorn in JEditorPane, here is the same JEditorPane on steroids with Nashorn, in the context of some kind of CMS backend system: Above, you see heavy reusage of NetBeans IDE editor infrastructure. Parts of it are with thanks to Steven Yi, who has done some great research in this area. Code completion, right-click popup menu, line numbering, editor toolbar, find/replace features, block selection, comment/uncomment features, etc, etc, etc, all the rich editor features from NetBeans IDE are there, within a plain old JEditorPane. And everything is externally extensible, e.g., new actions can be registered by external modules into the right-click popup menu or the editor toolbar or the sidebar, etc. For example, here's code completion (Ctrl-Space): It even has the cool new feature where if you select a closing brace and the opening brace isn't in the visible area, a rectangular popup appears at the top of the editor, to show how the current piece of code begins: The only thing I am missing is code folding! I wish that would work too, still figuring it out. What's also cool is that this is a Maven project. The sources: http://java.net/projects/nb-api-samples/sources/api-samples/show/versions/7.3/misc/CMSBackOffice2

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xubuntu 12.04 screen regularly stops refreshing, refreshing resumes after un-/re-maximizing a window

- by user68477

My screen frequently stops completely refreshing. I can make it resume refreshing by un-maximizing/re-maximize a window or by switching workspace (the un-/re-maximizing works every time. Switching workspace sometimes has to be done a couple of times). The immediate impression is that the system is frozen: there is apparently no reaction to anything I do but interestingly window title bar will change, if I switch application with (i.e alt+tab or browse through folders) I saw an identical issue in ubuntu 10.04, though a lot less frequent, I never saw this in ubuntu 12.04 (which I have been using the last 4-5 months). After switching to Xubuntu I'm seeing this again and more frequently. The specific reason I'm not sure this is a bug: I installed gnome-control-center which dragged in tons of packages. This was while trying to fix dual-screen setup. I believe the issue surfaced after this. I later meticulously removed every package from this batch (purge) in the hope that every setting would also be removed. But the issue has persisted. Another issue happened at the same time, it may be totally unrelated but it feels as if it is the same basic issue: the screen resolution of the greeter became less than the expected 1680x1050 and often after login there's just a blank and totally unresponsive wallpaper without panel so I have to force reboot. When the login is successful it's very clear that it works hard to determine the correct resolution which is achieved after a few blink to black screens. My questions: 1) Is this a settings issue or a bug? 2) How do I begin to research the issue - could I perhaps some way reset xubuntu/xfce to default. 3) If this is a bug where would be the most appropriate place report this? System: Thinkpad T500 ati radeon HD 3650 $ fglrxinfo display: :0.0 screen: 0 OpenGL vendor string: Advanced Micro Devices, Inc. OpenGL renderer string: ATI Mobility Radeon HD 3650 OpenGL version string: 3.3.11627 Compatibility Profile Context $ uname -a Linux srvname 3.2.0-32-generic #51-Ubuntu SMP Wed Sep 26 21:33:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux xfce 4.10 Compiz 0.9.7.8

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Should I use a separate 'admin' user as my "root sudo" or grant sudo to my 'app' user?

- by AJB

I'm still wrapping my brain around the Ubuntu 'nullify root' user management philosophy (and Linux in general) and I'm wondering if I should 'replace' my root user with a user called 'admin' (which basically has all the powers of the root, when using sudo) and create another user called 'app' that will be the primary user for my app. Here's the context: I'll be running a LNMP stack on Ubuntu 12.04 Server LTS. There will be only one app running on the server. The 'app' user needs to have SUPER privileges for MySQL. PHP will need to be able to exec() shell commands. The 'app' user will need to be able to transfer files via SFTP. And I'm thinking this would be the best approach: nullify 'root' user create a user called 'admin' that will be a full sudoer of root, this will be the new "root" user of NGINX, PHP, and MySQL (and all system software) grant SUPER privileges to 'app' in MySQL Grant SFTP privileges to only the 'app' user. As I'm new to this, and the information I've found in researching it tends to be of a more general nature, I'm wondering if this is a solid approach, or if it's unorthodox in a way that would cause issues down the road. Thanks in advance for any help.

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Do cross reference database tables have a place in domain driven design?

- by Mike Cellini

First some background. Let's say we have a system where a customer is placing an order in a web interface. The items that customer is ordering can priced in various ways. Sometimes including the cost of delivery and sometimes not at all. That pricing effectively depends on a variety of factors including the vendor's own pricing model, that vendor's individual contracts with customers as well as that vendor's contracts with its own suppliers. Let's assume that once a customer places an order for a particular item and chooses a contract if any, the method of delivery can be determined by variables on those contracts. Those delivery methods also live in their own table in the database and have various properties consumed downstream. It makes sense that a cross reference or lookup table would store that information. That table would be loaded into the domain and could then be used to apply the appropriate delivery method while processing the order. Does this make sense in the context of domain driven design? Or is my thinking too relational? Is this logic that should be built into it's own class/method (I mean beyond apply the cross reference table data)?

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Why is Python used for high-performance/scientific computing (but Ruby isn't)?

- by Cyclops

There's a quote from a PyCon 2011 talk that goes: At least in our shop (Argonne National Laboratory) we have three accepted languages for scientific computing. In this order they are C/C++, Fortran in all its dialects, and Python. You’ll notice the absolute and total lack of Ruby, Perl, Java. It was in the more general context of high-performance computing. Granted the quote is only from one shop, but another question about languages for HPC, also lists Python as one to learn (and not Ruby). Now, I can understand C/C++ and Fortran being used in that problem-space (and Perl/Java not being used). But I'm surprised that there would be a major difference in Python and Ruby use for HPC, given that they are fairly similar. (Note - I'm a fan of Python, but have nothing against Ruby). Is there some specific reason why the one language took off? Is it about the libraries available? Some specific language features? The community? Or maybe just historical contigency, and it could have gone the other way?

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Join me at OpenWorld 2012

- by Michael Palmeter (Exalogic PM)

For those of you that will be coming out to Oracle OpenWorld 2012 next ween in San Francisco, I encourage you to take a few minutes on Monday afternoon to come to my session on Oracle Exalogic. Click here for more info: CON9416 - Oracle Exalogic 2.0: Ready-to-Deploy, Mission-Critical Private Cloud My session is one of the first on Oracle Exalogic (one of the privileges of running Product Management for the product) and with that in mind it is going to be something of an introduction and overview. The material I will present is tailored for C-level customers that are interested in the product but haven't really been exposed to it in any detail. This is essentially the same sort of presentation I give to customers that visit Oracle HQ, and it provides context for all of the other excellent sessions that follow. During this session I will talk about: The macro-trends in the industry that are driving Exalogic strategy - IT-as-a-Service and infrastructure convergence The first two years of market success with Exalogic - who's bought it, why, and what their results have been Exalogic key features and differentiation - why it's the best possible platform for Oracle business applications and middleware How Exalogic performs, and why it is the hands-down performance champion of Enterprise cloud platforms If you haven't signed up yet, please do. I'd love to see you there.

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How do you proactively guard against errors of omission?

- by Gabriel

I'll preface this with I don't know if anyone else who's been programming as long as I have actually has this problem, but at the very least, the answer might help someone with less xp. I just stared at this code for 5 minutes, thinking I was losing my mind that it didn't work: var usedNames = new HashSet<string>(); Func<string, string> l = (s) => { for (int i = 0; ; i++) { var next = (s + i).TrimEnd('0'); if (!usedNames.Contains(next)) { return next; } } }; Finally I noticed I forgot to add the used name to the hash set. Similarly, I've spent minutes upon minutes over omitting context.SaveChanges(). I think I get so distracted by the details that I'm thinking about that some really small details become invisible to me - it's almost at the level of mental block. Are there tactics to prevent this? update: a side effect of asking this was fixing the error it would have for i 9 (Thanks!) var usedNames = new HashSet<string>(); Func<string, string> name = (s) => { string result = s; if(usedNames.Contains(s)) for (int i = 1; ; result = s + i++) if (!usedNames.Contains(result)) break; usedNames.Add(result); return result; };

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Pair Programming, for or against? [on hold]

- by user1037729

I believe it has many advantages over individual programming: Pros By pairing senior with relatively junior staff, the more junior can get up to speed with both project and computing experience, and the senior will re-think the problem in order to communicate with the junior, thus re-checking his own thinking (rubber duck principle!). At least 2 people will know about any single piece of work, if one person is away the other can cover, or if some one leaves a project knowledge transfer is easier. Two brains on a complex task is more effective, communication keeps the work free flowing and provides redundancy in decision making. Code is effectively reviewed as its being written, no need for a separate reviewing phase which requires a context switch as someone who has not been working on the piece in question would be required to understand and review the related code. Reviewing code on your own which you haven't written or architected is not fun, hence counter productive. Cons Less bandwith for performing tasks, lets say we have 4 devs, pair programming requires 2 devs per task, so we would be doing 2 tasks concurrently as a posed to 4. I believe this "Con" does not stand up as the pair programmed task would complete sooner and comes with a review built in for free! Ie the pair programming task would be more efficient and thus free up resources earlier. Less flexibility to chop and change tasks as two developers are tied into a task, when flexibility is required this could be a problem.

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Engineered Systems and PCI

- by Joel Weise

Oracle has a number of different engineered systems. These are design to be highly integrated, optimized and secure systems. The Exadata database engineered system and the Exalogic application engineered system are two good examples. Often I am asked how these comply with different standards and regulations. Exalogic is the Oracle engineered system that supports applications and the focus of today's blog. First, we must recognize that as a collection of hardware and software, we cannot simply state that Exalogic is "compliant" with PCI DSS. This is because Exalogic must be implemented within the context of one's existing IT infrastructure, the security features of that infrastructure, the governance framework that exists, security policies, operational procedures, and other factors. What we can say though, is that Exalogic has been designed with various security capabilities that can be utilized to support compliance to PCI DSS as well as other standards and regulations (e.g., NIST and HIPAA). Given that, Exalogic can be an excellant platform for running PCI related payment applications. Coalfire Systems, a leading QSA in the US, has evaluated Exalogic against PCI DSS and supports this position. Their evaluation can be found here: Exalogic and PCI Compliance. I hope you find it useful.

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Can't get Unity 3D to work in 11.10

- by pmoseph

I recently upgraded to 11.10 on my Lenovo ThinkPad T520, and I'm not able to load Unity 3D (I'm not selecting 2D at login menu either). me@mycomp:~$ echo $DESKTOP_SESSION ubuntu-2d I ran the unity support test below as well. me@mycomp:~$ /usr/lib/nux/unity_support_test -p Xlib: extension "GLX" missing on display ":0.0". Xlib: extension "GLX" missing on display ":0.0". Xlib: extension "GLX" missing on display ":0.0". Error: unable to create the OpenGL context And it looks like I only have one graphics card: me@mycomp:~$ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) Also, Ubuntu lists nothing under the "Additional Drivers" window. Any help would be extremely appreciated as I'm somewhat of a noob. Thanks! Edit 1: Here is the output of lshw -C display me@mycomp:~$ sudo lshw -C display *-display description: VGA compatible controller product: 2nd Generation Core Processor Family Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:43 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:5000(size=64)

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How to configure background image to be at the bottom OpenGL Android

- by Maxim Shoustin

I have class that draws white line: public class Line { //private FloatBuffer vertexBuffer; private FloatBuffer frameVertices; ByteBuffer diagIndices; float[] vertices = { -0.5f, -0.5f, 0.0f, -0.5f, 0.5f, 0.0f }; public Line(GL10 gl) { // a float has 4 bytes so we allocate for each coordinate 4 bytes ByteBuffer vertexByteBuffer = ByteBuffer.allocateDirect(vertices.length * 4); vertexByteBuffer.order(ByteOrder.nativeOrder()); // allocates the memory from the byte buffer frameVertices = vertexByteBuffer.asFloatBuffer(); // fill the vertexBuffer with the vertices frameVertices.put(vertices); // set the cursor position to the beginning of the buffer frameVertices.position(0); } /** The draw method for the triangle with the GL context */ public void draw(GL10 gl) { gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glVertexPointer(2, GL10.GL_FLOAT, 0, frameVertices); gl.glColor4f(1.0f, 1.0f, 1.0f, 1f); gl.glDrawArrays(GL10.GL_LINE_LOOP , 0, vertices.length / 3); gl.glLineWidth(5.0f); gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); } } It works fine. The problem is: When I add BG image, I don't see the line glView = new GLSurfaceView(this); // Allocate a GLSurfaceView glView.setEGLConfigChooser(8, 8, 8, 8, 16, 0); glView.setRenderer(new mainRenderer(this)); // Use a custom renderer glView.setBackgroundResource(R.drawable.bg_day); // <- BG glView.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY); glView.getHolder().setFormat(PixelFormat.TRANSLUCENT); How to get rid of that?

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IZWebFileManager

- by csharp-source.net

IZWebFileManager is featured File Manager control for ASP.NET 2 compatible with most-used browsers like MS Internet Explorer and Firefox. Features: * Copying, moving, renaming, deletion of files and folders; * Ability to work (copy, move, delete) with several files at once; * File upload; * Easy duplication of files and folders; * Right-click context menu (Windows Explorer like); * Common shortcuts supported. Arrow Keys, F5 - refresh, F2 - rename, Enter - default action, Delete; * Permission control: you can forbid uploading, renaming or deletion of files and folders. You can limit size of files that can be uploaded and restrict types of files which could be uploaded by their extensions. For example, you can let users upload pictures (gifs and jpgs) only with the size not more than 50KB. * Multilingual interface. English, Russian and Hebrew are already supported. Other languages can be added without even recompilation of the component; * Full Unicode and Right-to-Left support; * All major browsers supported. The component has been tested and works fine in Netscape 8.0, Firefox 1.5, IE 6.0 (SP2); * Optimized and compiled for .Net Framework 2.0; * Totally easy to install and to use. No additional configuration in web.config need. Deployed with *.dll only; * XHTML capability.

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My application had a WindowsIdentity crisis

- by Brian Donahue

The project I have been working on this week to test computer environments needs to do various actions as a user other than the one running the application. For instance, it looks up an installed Windows Service, finds out who the startup user is, and tries to connect to a database as that Windows user. Later on, it will need to access a file in the context of the currently logged-in user. With ASP .NET, this is super-easy: just go into Web.Config and set up the "identity impersonate" node, which can either impersonate a named user or the one who had logged into the website if authentication was enabled. With Windows applications, this is not so straightforward. There may be something I am overlooking, but the limitation seems to be that you can only change the security context on the current thread: any threads spawned by the impersonated thread also inherit the impersonated credentials. Impersonation is easy enough to do, once you figure out how. Here is my code for impersonating a user on the current thread: using System; using System.ComponentModel; using System.Runtime.InteropServices; using System.Security.Principal; public class ImpersonateUser { IntPtr userHandle; [DllImport("advapi32.dll", SetLastError = true)] static extern bool LogonUser( string lpszUsername, string lpszDomain, string lpszPassword, LogonType dwLogonType, LogonProvider dwLogonProvider, out IntPtr phToken ); [DllImport("kernel32.dll", SetLastError = true)] static extern bool CloseHandle(IntPtr hHandle); enum LogonType : int { Interactive = 2, Network = 3, Batch = 4, Service = 5, NetworkCleartext = 8, NewCredentials = 9, } enum LogonProvider : int { Default = 0, } public static WindowsImpersonationContext Impersonate(string user, string domain, string password) { IntPtr userHandle = IntPtr.Zero; bool loggedOn = LogonUser( user, domain, password, LogonType.Interactive, LogonProvider.Default, out userHandle); if (!loggedOn) throw new Win32Exception(Marshal.GetLastWin32Error()); WindowsIdentity identity = new WindowsIdentity(userHandle); WindowsPrincipal principal = new WindowsPrincipal(identity); System.Threading.Thread.CurrentPrincipal = principal; return identity.Impersonate(); } } /* Call impersonation */ ImpersonateUser.Impersonate("UserName","DomainName","Password"); /* When you want to go back to the original user */ WindowsIdentity.Impersonate(IntPtr.Zero); When you want to stop impersonating, you can call Impersonate() again with a null pointer. This will allow you to simulate a variety of different Windows users from the same applicaiton.

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"That's cool. But it would be even better if..."

- by Geertjan

I recently talked to some NetBeans users who were interested in a demonstration of the features that will be part of NetBeans IDE 7.2. (See the 7.2 New and Noteworthy for the full list.) One of the new features I demonstrated was this one. In an interface declaration, NetBeans IDE 7.2 will provide a hint, as can be seen in the sidebar below: When the lightbulb is clicked, or Alt-Enter is pressed, this will be shown: When the hint is invoked, the user will see this: And then the user will be able to enter the name of a class, and the name of a package, and assuming the defaults above are taken, a class with this content will be generated: package demo; public class WordProcessorImpl implements WordProcessor { @Override public String process(String word) { throw new UnsupportedOperationException("Not supported yet."); } } When I demonstrated the above, the response from the audience was: "That's cool. But it would be even better if..." it was possible to implement an interface into an existing class. it was possible to select a class and specify the interfaces that it should implement. it was possible, in the context of a NetBeans Platform application, to specify the module where the class should be implemented. So I created some issues: Implement an interface into an existing class http://netbeans.org/bugzilla/show_bug.cgi?id=210804 Select class and specify interfaces to implement http://netbeans.org/bugzilla/show_bug.cgi?id=210805 Allow user to select module for generating implementation http://netbeans.org/bugzilla/show_bug.cgi?id=210807

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How do you tell if advice from a senior developer is bad?

- by learnjourney

Recently, I started my first job as a junior developer and I have a more senior developer in charge of mentoring me in this small company. However, there are several times when he would give me advice on things that I just couldn't agree with (it goes against what I learned in several good books on the topic written by the experts, questions I asked on some Q&A sites also agree with me) and given our busy schedule, we probably have no time for long debates. So far, I have been trying to avoid the issue by listening to him, raising a counterpoint based on what I've learned as current good practices. He raises his original point again (most of the time he will say best practice, more maintainable but just didn't go further), I take a note (since he didn't raise a new point to counter my counterpoint), think about it and research at home, but don't make any changes (I'm still not convinced). But recently, he approached me yet again, saw my code and asked me why haven't I changed it to his suggestion. This is the 3rd time in 2--3 weeks. As a junior developer, I know that I should respect him, but at the same time I just can't agree with some of his advice. Yet I'm being pressured to make changes that I think will make the project worse. Of course as an inexperienced developer, I could be wrong and his way might be better, it may be 1 of those exception cases. My question is: what can I do to better judge if a senior developer's advice is good, bad or maybe it's (good but outdated in today context)? And if it is bad/outdated, what tactics can I use to not implement it his way despite his 'pressures' while maintaining the fact that I respect him as a senior?

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How do you compare programming job offers from companies in different countries?

- by Danny Tuppeny

This isn't really a programmer-specific question, but I'm not sure of a more appropriate place, and I think the users of this site are best able to answer the question in the context of programmers. Relocating to the US seems fairly common in the programming industry. I live in the UK, and maybe one day, I might do it too. So, if that day comes - how would you go about comparing job offers? Benefits are fairly easy to compare, but given the differences in cost of living, how would you go about comparing salaries and the quality of living you'll have? In a country where the cost of living is lower, you might be able to accept a lower salary (based on exchange rate) and still have the same quality of living. But what can you do to ensure this? In some cases, you may even take a "pay rise" in terms of exchange rate, but end up far worse off. How can you compare job offers across different countries to get an idea of the salary you would need in order to not feel you've gone "backwards"?

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Showing an Action on a TopComponent Node

- by Geertjan

Let's say you want to extend the tools in NetBeans IDE, specifically for TopComponents. When the user right-clicks in the Projects window (or Files window or Favorites window) on a Java class that extends TopComponent, a menu item should be available for branding the TopComponent. What "branding" entails is, at this stage, a secondary question. The primary question, from an implementation point of view, is "how do I create an action that is only shown when the user right-clicks on a TopComponent?" Here's the solution, in NetBeans IDE 7.2 (the "lazy" attribute, here set to false, is new in 7.2): import com.sun.source.tree.ClassTree; import com.sun.source.util.TreePathScanner; import java.awt.event.ActionEvent; import java.io.IOException; import javax.lang.model.element.Element; import javax.lang.model.element.TypeElement; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JOptionPane; import org.netbeans.api.java.source.CompilationController; import org.netbeans.api.java.source.CompilationInfo; import org.netbeans.api.java.source.JavaSource; import org.netbeans.api.java.source.JavaSource.Phase; import org.netbeans.api.java.source.Task; import org.openide.awt.ActionID; import org.openide.awt.ActionReference; import org.openide.awt.ActionReferences; import org.openide.awt.ActionRegistration; import org.openide.awt.DynamicMenuContent; import org.openide.loaders.DataObject; import org.openide.util.ContextAwareAction; import org.openide.util.Exceptions; import org.openide.util.Lookup; import org.openide.util.NbBundle.Messages; import org.openide.util.Utilities; @ActionID( category = "Tools", id = "org.tc.customizer.BrandTopComponentAction") @ActionRegistration( displayName = "#CTL_BrandTopComponentAction", lazy = false) @ActionReferences({ @ActionReference(path = "Loaders/text/x-java/Actions", position = 150) }) @Messages("CTL_BrandTopComponentAction=Brand") public final class BrandTopComponentAction extends AbstractAction implements ContextAwareAction { private final DataObject dobj; public BrandTopComponentAction() { this(Utilities.actionsGlobalContext()); } public BrandTopComponentAction(Lookup context) { super(Bundle.CTL_BrandTopComponentAction()); this.dobj = context.lookup(DataObject.class); //Enable the menu item only if we're dealing with a TopComponent JavaSource javaSource = JavaSource.forFileObject(dobj.getPrimaryFile()); try { javaSource.runUserActionTask(new ScanForTopComponentTask(this), true); } catch (IOException ex) { Exceptions.printStackTrace(ex); } //Hide the menu item if it isn't enabled: putValue(DynamicMenuContent.HIDE_WHEN_DISABLED, true); } @Override public void actionPerformed(ActionEvent ev) { JOptionPane.showMessageDialog(null, "Hurray, I am a TopComponent!"); //Now add your code for showing a dialog, //where the dialog will display UI for branding the TopComponent somehow //and retrieve those branding values //and then change the TopComponent class accordingly. } @Override public Action createContextAwareInstance(Lookup actionContext) { return new BrandTopComponentAction(actionContext); } private static class ScanForTopComponentTask implements Task<CompilationController> { private final BrandTopComponentAction action; private ScanForTopComponentTask(BrandTopComponentAction action) { this.action = action; } @Override public void run(CompilationController compilationController) throws Exception { compilationController.toPhase(Phase.ELEMENTS_RESOLVED); new MemberVisitor(compilationController, action).scan( compilationController.getCompilationUnit(), null); } } private static class MemberVisitor extends TreePathScanner<Void, Void> { private CompilationInfo info; private final AbstractAction action; public MemberVisitor(CompilationInfo info, AbstractAction action) { this.info = info; this.action = action; } @Override public Void visitClass(ClassTree t, Void v) { Element el = info.getTrees().getElement(getCurrentPath()); if (el != null) { TypeElement te = (TypeElement) el; if (te.getSuperclass().toString().equals("org.openide.windows.TopComponent")){ action.setEnabled(true); } else { action.setEnabled(false); } } return null; } } } The code above is the result of combining various tutorials found on the NetBeans Platform Learning Trail.

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Classes as a compilation unit

- by Yannbane

If "compilation unit" is unclear, please refer to this. However, what I mean by it will be clear from the context. Edit: my language allows for multiple inheritance, unlike Java. I've started designing+developing my own programming language for educational, recreational, and potentially useful purposes. At first, I've decided to base it off Java. This implied that I would have all the code be written inside classes, and that code compiles to classes, which are loaded by the VM. However, I've excluded features such as interfaces and abstract classes, because I found no need for them. They seemed to be enforcing a paradigm, and I'd like my language not to do that. I wanted to keep the classes as the compilation unit though, because it seemed convenient to implement, familiar, and I just liked the idea. Then I noticed that I'm basically left with a glorified module system, where classes could be used either as "namespaces", providing constants and functions using the static directive, or as templates for objects that need to be instantiated ("actual" purpose of classes in other languages). Now I'm left wondering: what are the benefits of having classes as compilation units? (Also, any general commentary on my design would be much appreciated.)

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