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• How to plan/manage multi-platform (mobile) products?

  - by PhD

  Say I've to develop an app that runs on iOS, Android and Windows 8 Mobile. Now all three platforms are technically in different program languages. The only 'reuse' that I can see is that of the boxes-and-lines drawings (UML :) charts and nothing else. So how do companies/programmers manage the variation of the same product across different platforms especially since the implementation languages differ? It's 'easier' in the desktop world IMO given the plethora of languages and cross-platform libraries to make your life easier. Not so in the mobile world. More so, product line management principles don't seem to be all that applicable - what is same and variant doesn't really matter - the application is the same (conceptually) and the implementation is variant. Some difficulties that come to mind: Bug Fixing: Applications maybe designed in a similar manner but the bug identification and fixing would be radically different. A bug on iOS may/may-not be existent for that on Android. Or a bug fix approach on one platform may not be the same on another (unless it's a semantic bug like a!=b instead of a==b which would require the same 'approach' to fixing in essence Enhancements: Making a change on one platform would be radically different than on another Code-Design Divergence: They way the code is written/organized, the class structures etc., could be very different given the different implementation environments - leading to further reuse of the (above) UML models. There are of course many others - just keeping the development in sync and making sure all applications are up to the same version with the same set of features etc. Seems the effort is 3x that of a single application. So how exactly does one manage this nightmarish situation? Some thoughts: Split application to client/server to minimize the effect to client side only (not always doable) Use frameworks like Unity-3D that could take care of the cross-platform problem (mostly applicable to games and probably not to other applications etc.) Any other ways of managing a platform line? What are some proven approaches to managing/taming the effects?

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• Should I encrypt data in database?

  - by Tio

  I have a client, for which I'm going to do an Web application about patient care, managing patients, consults, history, calendars, everything about that basically. The problem is that this is sensitive data, patient history and such. The client insists on encrypting the data at the database level, but I think this is going to deteriorate the performance of the web app. ( But maybe I shouldn't be worried about this ) I've read the laws about data protection on health issues ( Portugal ), but isn't very specific about this ( I just questioned them about this, I'm waiting for their response ). I've read the following link, but my question is different, should I encrypt the data in the database, or not. One problem that I foresee in encrypting data, is that I'm going to need a key, this could be the user password, but we all know how user passwords are ( 12345 etc etc ), and generating a key I would have to store it somewhere, this means that the programmer, dba, whatever could have access to it, any thoughts on this? Even adding an random salt to the user password isn't going to solve the problem since I can always access it, and therefore decrypt the data.

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• For an ORM supporting data validation, should constraints be enforced in the database as well?

  - by Ramnique Singh

  I have always applied constraints at the database level in addition to my (ActiveRecord) models. But I've been wondering if this is really required? A little background I recently had to unit test a basic automated timestamp generation method for a model. Normally, the test would create an instance of the model and save it without validation. But there are other required fields that aren't nullable at the in the table definition, meaning I cant save the instance even if I skip the ActiveRecord validation. So I'm thinking if I should remove such constraints from the db itself, and let the ORM handle them? Possible advantages if I skip constraints in db, imo - Can modify a validation rule in the model, without having to migrate the database. Can skip validation in testing. Possible disadvantage? If its possible that ORM validation fails or is bypassed, howsoever, the database does not check for constraints. What do you think? EDIT In this case, I'm using the Yii Framework, which generates the model from the database, hence database rules are generated also (though I could always write them post-generation myself too).

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• How-To: Run CMSDK against a RAC cluster

  - by frank.closheim

  Using CMSDK in a production environment often requires a robust, reliable and failover enabled repository. When using Oracle Real Application Cluster (RAC) with your CMSDK repository you need to have a specific configuration in place to support such a setup. This post will explain the configuration steps required when running CMSDK 9.0.4.6 with Oracle WebLogic Server (WLS).In the previous CMSDK 9.0.4.2 version a RAC enabled connect string looked like this: (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = rac1)(PORT = 1521))(ADDRESS = (PROTOCOL = TCP)(HOST = rac2)(PORT = 1521))(LOAD_BALANCE = NO)(FAILOVER = ON)(CONNECT_DATA =(SERVICE_NAME = rac)(failover_mode = (type=select)(method=basic)))CMSDK 9.0.4.6 makes use of data sources to connect to the underlying database. These data sources are configured inside your Application Server, such as Oracle WebLogic Server.In Oracle WebLogic Server 10.3.4, a single data source implementation has been introduced to support an RAC cluster. It responds to Fast Application Notification (FAN) events to provide Fast Connection Failover (FCF), Runtime Connection Load-Balancing (RCLB), and RAC instance graceful shutdown. XA affinity is supported at the global transaction Id level. The new feature is called WebLogic Active GridLink for RAC; which is implemented as the GridLink data source within WebLogic Server.This GridLink data source also works with Oracle Single Client Access Name (SCAN). SCAN is a feature used in RAC environments that provides a single name for clients to access any Oracle Database running in a cluster. You can think of SCAN as a cluster alias for databases in the cluster. The benefit is that the client’s connect information does not need to change if you add or remove nodes or databases in the cluster.The CMSDK 9.0.4.6 documentation describes how to create a regular JDBC data source named jdbc/OracleDS. Please refer to the following document which describes in detail how to create a GridLink data source in WLS.

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• Input prediction and server re-simultaion

  - by Lope

  I have read plenty of articles about multiplayer principles and I have basic client-server system set up. There is however one thing I am not clear on. When player enters input, it is sent to the server and steps back in time to check if what should have happened at the time of that input and it resimulates the world again. So far everything's clear. All articles took shooting as an example, because it is easy to explain and it is pretty straightforward, but I believe movement is more complicated. Imagine following situation: 2 players move towards each other. A------<------B Player A stops halfway towards the collision point, but there is lag spike so the command does not arrive on the server for a second or so. Current state of the world on the server (and on the other clients as well) at the time when input arrives is this: [1]: -------AB------- The command arrives and we go back in time and re-simulate the world, the result is this: [2]: ---AB----------- Player A sees situation [2] which is correct, but the player is suddenly teleported from the position in [1] (center) to the position in [2]. Is this how this is supposed to work? Point of the client prediction is to give lagged player feeling that everything is smooth, not to ruin experience for other players. Alternative is to discard timestamp on the player's input and handle it when it arrives on the server without going back in time. This, however, creates even more severe problems for lagged player (even if he is lagging just a bit)

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• Is there a simple, flat, XML-based query-able data storage solution? [closed]

  - by alex gray

  I have been in long pursuit of an XML-based query-able data store, and despite continued searches and evaluations, I have yet to find a solution that meets the my needs, which include: Data is wholly contained within XML nodes, in flat text files. There is a "native" - or at least unobtrusive - method with which to perform Create/Read/Update/Delete (CRUD) operations onto the "schema". I would consider access via http, XHR, javascript, PHP, BASH, or PERL to be unobtrusive, dependent on the complexity of the set of dependencies. Server-side file-system reads and writes. A client-side interface element, accessible in any browser without a plug-in. Some extra, preferred (but optional) requirements include: Respond to simple SQL, or similarly syntax queries. Serve the data on a bare bones https server, with no "extra stuff", either via XMLHTTPRequest, HTTP proper, or JSON. A few thoughts: What I'm looking for may be possible via some Java server implementations, but for the sake of this question, please do not suggest that - unless it meets ALL the requirements. Java, especially on the client-side is not really an option, nor is it appealing from a development viewpoint.* I know walking the filesystem is a stretch, and I've heard it's possible with XPATH or XSLT, but as far as I know, that's not ready for primetime, nor even yet a recommendation. However the ability to recursively traverse the filesystem is needed for such a system to be of useful facility. At this point, I have basically implemented what I described via, of all things, CGI and Bash, but there has to be an easier way. Thoughts?

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• Problems setting Hyper-V permissions

  - by Drew Burchett

  I am using a Windows 2012 Hyper-V server to host some test PCs. Our support personnel should be able to take snapshots of these machines and roll a test machine back to a specific snapshot, but they should not have any other permissions. I have followed the directions in this article and, on suggestion of another article have added the specific AD group to the local Hyper-V Administrators group, but whenever one of them attempts to connect to the server to take a snapshot, they get an error stating that they do not have permission to connect to that server. I'm sure I'm missing something, but at this point I'm at a loss as to what that would be. Can anyone tell me how to properly set these permissions? edit: Per request I am attaching a screenshot of the permissions I have set for this group.

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• Good technologies for developing a modular server component in .net?

  - by nubbers

  I am using WPF, Prism and Unity to develop the user interface for a .net application. The UI will run from a PC, but I also need to develop a separate complex server component that will provide services to the PC component via WCF. Prism and Unity have proved to be of great value in creating a modular application, at least as far as the user interface is concerned. I would also like to make the server component modular, but I cannot find anywhere what techniques, patterns and technologies are suitable. I have considered: Unity or one of the other DI containers Selected parts of Prism, such as modules and events Are these suitable for developing a modular server component? Or are these UI technologies only and should I be looking at something completely different?

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• Unable to set .NET 4 on Application Pool from remote, works locally on server

  - by Robin Wassén-Andersson

  I have setup Remote Administration for IIS successfully and connected to it. For some reason .NET Framework 4 doesn't show up as an option when configuring the Application Pools from remote even though .NET 4 is installed on both server and client (not that client should matter). If I login to the server with RDP and configure the Application Pools it work as intended, the option shows up. Even more odd is if I edit an Application Pool that already runs .Net 4 it shows up as an alternative (kind of strangly formatted text though, just says v4.0 instead of .NET Framework v4.0.30319 ) How should I proceed to solve this?

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• public_html permissions for local development

  - by maGz

  I know this question has popped up a couple times, but I can't seem to find a definitive answer to my issue, so please bear with me. I have Ubuntu Server 12.04 setup in VirtualBox for PHP development and testing (Drupal plus other PHP sites using Yii framework). My question is in 3 parts... 1) If I create a public_html folder under /home/myuser, do I need to give ownership of that folder to the Apache www-data group? If so, are there any specific permissions I should be setting? 755? (Btw, I am following this guide to create the public_html directory and set up multiple virtual hosts per site I create and test) I previously had all of my sites under /var/www, but ran into massive permission denied errors whenever I tried to sFTP to it, either through FileZilla or PhpStorm. This is what I had previously done: sudo chgrp www-data /var/www sudo chmod -R 775 /var/www sudo chmod -R g+s /var/www sudo usermod -G www-data [my_ftp_user] 2) The second part of my question is this: If I create my PHP project and files in Windows through PhpStorm, and then upload via sFTP, will permissions get affected? 3) Once I am satisfied with my developed project, would it be advisable to move and test them under /var/www to see how it would fair in a production-ish environment? I would really appreciate the help and advice here. I'm learning more as I go along, but dealing with Linux files and permissions is a bit of a new ballgame for me! Thank you

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• Wrong owner and group for files created under a samba shared directory

  - by agmao

  I am trying to make writing to a shared samba directory work. I got a very weird problem. Now the shared directory is writable from a client machine. But the files created under the samba share directory have weird owner and group names. I am writing to the shared directory as user mike under the client machine, but the file created always has user and group name as steve instead... Does anybody know why that would happen...? Another thing I just noticed is that on the samba server, the files have owner and user name as samba, which I created for samba clients. Thanks a lot

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• Asus EEE PC 1005HA (XP Home) refuses to connect to Virgin Mobile MiFi

  - by Dennis Wurster

  My client has an Asus EEE PC model 1005HA, and we're attempting to connect it to the WiFi network created by a VirginMobile MiFi unit. They also have a MacBook Pro with Snow Leopard that has absolutely no issue connecting to the MiFi. The specific symptom is that the netbook fails to lease an IP address from the MiFi unit. I supply the 12-digit numerical password (WPA) to the netbook, it throws a 'waiting for network' dialog with an indeterminate progress indicator, and then times out. Update: We've determined that this behavior has stopped when the EEE PC and the MiFi unit were taken out of the client's home, and to a different home that didn't have an existing wifi network. Similarly, when taken to a third location that didn't have wifi, the EEE PC and MiFi got along swimmingly. My current theory is that the existing wifi networks and the wifi leg of the MiFi unit are on the same channel and competing with one another. Perhaps the MacBook Pro has the capability to overcome this interference, while the EEE PC doesn't.

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• Figuring our complex REST queries for SharePoint

  - by Sahil Malik

  SharePoint 2010 Training: more information A little while ago, I showed the REST query for a relatively complex query. Some readers have emailed me about how to figure out further queries, and especially for complex insert/delete/update scenarios. Well it is quite easy to figure out almost any query for SharePoint REST API. Okay, this is not just about SharePoint – you can apply what you read here for any REST API interface supported by Microsoft, like WCF data services. But, sometimes when you have many columns, or complex update operations, or are working with weird providers, it is tough to figure out the specific HTTP request you need to craft, error free, using REST. Well fear not, there is hope. As an example, what I did is, I created a SharePoint site at http://sp2010.winsmarts.internal/sampledata with 3 lists in it - 1. Artists (with one Column, Title) Read full article ....

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• Unable to create a Windows 7 system image of a failing hard drive

  - by Rahul

  The hard disk of my one year old T400 Thinkpad has started failing periodic hardware tests. I get a "Targeted Read Test Failed" error. The "SMART short self test" times out. I am now trying to create a Windows 7 System image of the hard disk but it fails without giving any specific error messages. I tried using Comodo Backup but got an error (code 101117) there as well. I have copied the important files in Dropbox but would like to take a full System backup as I have plenty of software installed on the machine. Does anyone know why this is happening and how I can take a backup of the system image ?

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• How to benchmark kernel (-Os vs -O2)

  - by NightwishFan

  It seems logical to me that on a 64-bit kernel compiling it to optimize for size might help overall. (My distro of choice uses -O2) It has the benefits of more registers and memory and perhaps less cache contention than normal optimized code. I have a kernel compiled like this and it seems excellent. However my question is how can I prove this? I like using Phoronix for "real world" sort of benchmarks so I would prefer to test cases like that. What should I pick to test? Does anyone else have any alternatives? Thank you very much in advance.

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• web based source control management software [closed]

  - by tom smith

  hi. not sure if this is the right place, but hopefully someone might have thoughts on a solution/vendor. Starting to spec out a project that will require multiple (50-100) developers to be able to manipulate source files/scripts for a large scale project. The idea is to be able to have each app go through a dev/review/test process, where the users can select (or be assigned) the role they're going to have for the given app. I'm looking for web-based, version control, issue tracking, user roles/access, workflow functionality, etc... Ideally, the process will also allow for the reviewed/valid app to then be exported to a separate system for testing on the test server/environment. This can be hosted on our servers, or we can do the colo process. I've checked out Alassian/Collabnet, but any thoughts you can provide would me appreciated as well. thanks

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• Live CD installer gets stuck with a grayed out forward button.

  - by TRiG

  I have a CD with Ubuntu 10.10 and a laptop with Ubuntu 8.10. The laptop had all sorts of crud on it, and anything I wanted to keep was backed up on an external drive, so I was happy to do a wipe and reinstall instead of an update. So after a bit of faffing about trying to work out how to get the thing to boot from the CD drive, I did that. So the screen comes up with the choice: the options are Try Ubuntu and Install Ubuntu. I choose to install and to overwrite my current installation. So far so good. I then get a progress bar labelled something like copying files (I forget the exact wording) and further options to fill in for my location, keyboard locale, username and password. On each of these screens there are forward and back buttons. On the last screen (password), the forward button is greyed out. Well, I think to myself, no doubt it will become active when that copying files progress bar completes. The progress bar never completes. It hangs. And the label changes from copying files to the chirpy ready when you are. The forward button remains greyed out. The back button is as unhelpful as you'd expect it to be. And there's nothing else to click. We have reached an impasse. I tried restarting the laptop, to test whether it actually was properly installed. It wasn't. I tried to run Ubuntu live from the CD, to test whether the disk was damaged. That wouldn't work either, but I suspect it's just because the laptop is old and has a slow disk drive. I'm typing this question on another computer using the Ubuntu live CD and it's working fine. So there's nothing wrong with the CD.

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• How do I daemonify my daemon?

  - by jonobacon

  As part of the Ubuntu Accomplishments system I have a daemon that runs as well as a client that connects to it. The daemon is written in Python (using Twisted) and provides a dbus service and a means of processing requests from the clients. Right now the daemon is just a program I run before I run the client and it sets up the dbus service and provides an API that can be used by the clients. I want to transform this into something that can be installed and run as a system service for the user's session (e.g. starting on boot) and providing a means to start and stop it etc. The problem is, I am not sure what I need to do to properly daemonify it so it can run as this service. I wanted to ask if others can provide some guidance. Some things I need to ask: How can I treat it as a service that is run for the current user service (not a system service right now)? How do I ensure I can start, stop, and restart this session service? When packaging this, how do I ensure that it installs it as a service for the user's session and is started on login etc? In responding, if you can point me to specific examples or solutions I need to implement, that would be helpful. :-) Thanks! Jono

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• Why are some web clients requesting a page named "cache"?

  - by Toto

  We see errors like this in the apache error log: [Thu May 17 14:32:35 2012] [error] [client 192.168.1.1] File does not exist: /home/www-data/mywebsite.com/r/cache, referer: http://www.mywebsite.com/r/1010 It is strange because: There is no reference in the code/url about a folder/file "cache". The folder/file "cache" does not exist The client is randomly trying to access a "cache" folder everywhere on the website. It is always trying to access the folder/file "cache" following this pattern: Pattern: /level1/.../levelwhatever/filename (referer) /level1/.../levelwhatever/cache We run a LAMP (Debian stable: PHP 5.3.3-7+squeeze9. We also use APC 3.1.3p1). We use Google Analytics and AdSense. We do not know how to reproduce the problem. Note: I replaced the user's IP in the code for privacy.

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• How to clear the REPLACEBATT state from APC UPS after hot-swapping the battery

  - by Hubert Kario

  I replaced a battery in APC SmartUPS by hot-swapping. While the swap was all right and didn't disturb connected computers, the "Battery failed" LED on the front face kept glowing. I tried to use apctest from apcups package. Turned off the daemon and run self test (first changing BATTDATE in EEPROM). The test run fine but didn't clear the REPLACEBATT status or the glowing LED. How to clear the failed battery state without powering the UPS and connected equipment down?

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• Single-developer GIT workflow (moving from straightforward FTP)

  - by melat0nin

  I'm trying to decide whether moving to VCS is sensible for me. I am a single web developer in a small organisation (5 people). I'm thinking of VCS (Git) for these reasons: version control, offsite backup, centralised code repository (can access from home). At the moment I work on a live server generally. I FTP in, make my edits and save them, then reupload and refresh. The edits are usually to theme/plugin files for CMSes (e.g. concrete5 or Wordpress). This works well but provides no backup and no version control. I'm wondering how best to integrate VCS into this procedure. I would envisage setting up a Git server on the company's web server, but I'm not clear how to push changes out to client accounts (usually VPSes on the same server) - at the moment I simply log into SFTP with their details and make the changes directly. I'm also not sure what would sensibly represent a repository - would each client's website get their own one? Any insights or experience would be really helpful. I don't think I need the full power of Git by any means, but basic version control and de facto cloud access would be really useful.

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• How *NAT* was Implemented in Home Based Routers ? [closed]

  - by Sumit Arora

  Different Types of Home-Based Routers Exist, and those routers provide NAT Feature as well e.g; and most of them are Port Restricted. Q-1 : What kind of Base Softwares Manufactures use to develop NAT Functionality ? Q-2 : Is that Technology Proprietary ? Or some Open-Source used to develop that e.g; Firehol ? Q-3 : I am looking for a software which works exactly like a NAT,and by doing very basic configuration it should work either Symmetric NAT, Port Restricted NAT or Address Restricted NAT ? So that I can test some of my Network Application which are dependent on NAT via this way on same PC ? e.g; I can test my developed ICE Algorithms

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• How does one go about fixing a pixelation issue?

  - by Tyler

  I've been having a lot of trouble with pixelation and also in-game display driver crashes. At first I thought the problem may have been my graphics card (Sapphire 5750) but I have RMA'd it three times and I'm still having trouble. So what I think it might be is my PSU, its 650Watt but its made by Azza so it was cheap and not made by a necessarily good company. Or maybe it could be the CPU (AMD Phenom Black Edition 3.4Ghz) It runs hot (60C) but it passes Everest's test. Someone told me it could be the memory (8GB DDR3) but I don't really see how RAM has anything to do with my problem. So what are some of you suggestions? Here is a video a made awhile ago of what is happening. http://www.metacafe.com/watch/4392213/ati_radeon_5750/ That was just a stress test most games tend to just freeze and crash or lock my system up.

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• Boundary conditions for testing

  - by Loggie

  Ok so in a programming test I was given the following question. Question 1 (1 mark) Spot the potential bug in this section of code: void Class::Update( float dt ) { totalTime += dt; if( totalTime == 3.0f ) { // Do state change m_State++; } } The multiple choice answers for this question were. a) It has a constant floating point number where it should have a named constant variable b) It may not change state with only an equality test c) You don't know what state you are changing to d) The class is named poorly I wrongly answered this with answer C. I eventually received feedback on the answers and the feedback for this question was Correct answer is a. This is about understanding correct boundary conditions for tests. The other answers are arguably valid points, but do not indicate a potential bug in the code. My question here is, what does this have to do with boundary conditions? My understanding of boundary conditions is checking that a value is within a certain range, which isn't the case here. Upon looking over the question, in my opinion, B should be the correct answer when considering the accuracy issues of using floating point values.

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• Resume on 30 Days of SharePoint

  Dear readers, as you might have noticed... It was an organisational desaster on my end! Even though I continued my studies and research on Microsoft SharePoint 2013 during the last 30 days, I wasn't able to write an article a day to keep you posted on my progress. Nonetheless, I gathered a good number of additional blogs, mainly SharePoint MVP sites, and online forums which will be helpful in the next couple of weeks while I'm actually going to develop a C#-based client which will enable an existing 'legacy' application to SharePoint as a document management system (DMS) besides other already existing solutions. Finding excuses Well, no. Not really. I simply didn't block any or enough time every day to write down my progress during my own challenge. My log book on learning about SharePoint stands at 41 hours and 15 minutes during this month. Which means that I spent an average of more than 1 hour per day on getting into SharePoint. I know that might sound a little bit low but also keep in mind that I went for the challenge on top of my daily job and private responsibilities. During the same period there had been two priority 0 incidents from clients - external root cause - which took presedence over this leisure project. More to come Anyway, it was a first trial and despite the low level of reporting on my blog, I'm confident about what I learned during the last 30 days, and I'm ready to implement the client's requirements. At least, I would say that I have a better understanding about the road map or the path to walk during the next month. As time and secrecy allows I'm going to note down some bits and pieces... During the process of development, I'm going to 'cheat' on the challenge summary article and add links to those new entries. Just for the sake of completeness. Next challenge? Hmm, there had been ideas during the last meetup of the Mauritius Software Craftsmanship Community (MSCC) regarding certifications in IT and eventually we might organise some kind of a study group for specific exams, most probably Microsoft exams towards MCSD Web Developer or Windows Developer.

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