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• Ubuntu server 10.04 disconnects after short periods of inactivity on my site

  - by user57019

  I'm new to Ubuntu (installed it for the first time just a couple of days ago on my server). I've Ubuntu Server 10.04 and am just using the terminal, no GUI like Gnome. So far it's working pretty great except for one big thing. Whenever I go to sleep and there's no activity on my server (it's not a big site so active users drop to 0 during the night), the server kind of disconnects. The only thing that can bring the site back online is to restart the whole server. I've tried disabling powersaving by using setterm but that changes nothing. Even if I wake up the server by pressing any key or so the site wont go back online! I've tried just restarting both Apache and MySQL (I'm using LAMP-server btw) but not even that works. But as soon as I turn the power off and on at the server, everythings work like normal for a couple of minutes of inactivity (~5-15 minutes I'd guess) and then it's down again unless someone logs in to the site and is active. I was previously using XAMPP on my laptop with Windows XP and that worked 24/7 so I don't think it's anything with my router or ISP. This is driving me crazy! My site is down all the time I'm in school as I have no possibility to restart the server if it becomes offline. Does anyone have a clue to what could be wrong?

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• Should I be able to Windows Phone 8 emulator running with this AMD config

  - by pete

  I have just bought a new system as follows * AMD A4-5300 Trinity 3.4GHz * Gigabyte GA-F2A55M-DS2 Motherboard I checked and the A4-5300 supports Virtualisation. I have run the SLAT checking tool and it says that my machine supports SLAT. Been into the BIOS and ensures that SVN is enabled. I have also run the coreinfo tool that indicates that SVN is not valid fort the machine nor is NPT.. not sure why this conflicts with the true BIOS setting (I checked with GIGABYTE and seems that NPT and NX are not options that can be set in the BIOS) But.. when I run the emulator I it hangs - I can see some activity in Hyper-V manager, but it doesnt get very far and no meaningfull error messages. Been working the plethora of suggestions to get around this, but so far, nothing has worked. My question is should this setup allow the WP8 emulator to run. I am positive the CPU supports virtualisation, but are there issues with the motherboard here? I have spent a huge amount of time on this so far....am I wasting my time with the current configuration, or should it work? thanks

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• Ubuntu server 10.04 disconnects after short periods of inactivity on my site

  - by Melot

  Hi! I'm new to Ubuntu (installed it for the first time just a couple of days ago on my server). I've Ubuntu Server 10.04 and am just using the terminal, no GUI like Gnome. So far it's working pretty great except for one big thing. Whenever I go to sleep and there's no activity on my server (it's not a big site so active users drop to 0 during the night), the server kind of disconnects. The only thing that can bring the site back online is to restart the whole server. I've tried disabling powersaving by using setterm but that changes nothing. Even if I wake up the server by pressing any key or so the site wont go back online! I've tried just restarting both Apache and MySQL (I'm using LAMP-server btw) but not even that works. But as soon as I turn the power off and on at the server, everythings work like normal for a couple of minutes of inactivity (~5-15 minutes I'd guess) and then it's down again unless someone logs in to the site and is active. I was previously using XAMPP on my laptop with Windows XP and that worked 24/7 so I don't think it's anything with my router or ISP. This is driving me crazy! My site is down all the time I'm in school as I have no possibility to restart the server if it becomes offline. Does anyone have a clue to what could be wrong?

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• SSL configuration issue. SSL/IIS7 not loading all scripts/CSS on user's first visit

  - by Chris

  Hi all, Hopefully this isnt a tricky one. I've got a web app that doesn't load all javascript/css/images on the first visit. Second visit is fine. After approximately 2 minutes of inactivity the problem reoccurs. These problems only started occuring after the customer requested SSL be applied to the application. Ajax requests stop working after 2 minutes of activity despite a successful page load of all javascript elements. Application timeout is 30 minutes - like I said, everything was fine before SSL was applied. All javascript and CSS files use absolute URLS - e.g https://blablabla There appears to be no pattern as to why certain files arent loaded. The firebug Net output shows the status for the failed elements as 'Aborted'. For example, site.css and nav.css are in the same folder, are declared after each other in the head tag yet one is loaded and the other is not. Both will load fine after refreshing the page (unless roughly two minutes have passed). An Ajax request also shows as aborted after two minutes. However, if i do the request again the Ajax request will succeed. Almost as if the first request woke something up. None of these problems occur in Chrome Any ideas? FYI this is a .Net 4 C# MVC app running under IIS7 but I'm not sure its relevant since it works in Chrome. Everything worked fine before SSL was applied. Originally posted on stackoverflow but recommended to list here. Can provide additional details if necessary.

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• Web Server slows down (ASP.NET)

  - by mfeingold

  below is a question I posted on stackoverflow . as suggested by Martin Clarke I also post it here. We have a really strange problem. One of the servers in the server farm becomes really slow. We see a number of timeouts in the logs and overall response time is not where it should be (and is on other servers in the farm). What is also strange is that it is not just the web app - Just logging into the server takes up to 1.5 min to show you the desktop. Once you are in, the system is as responsive as ever - unless you try to launch something, i.e. notepad - it takes another minute to launch and after launch it works fine. I checked a number of things - memory utilization is reasonable, CPU is below 15%, windows handles, event logs do not show anything. Recycling the aps.net process does not fix it - it still takes over a minute to log in. Rebooting the server helped, but now it started to slow down again. After a closer look we found out that Windows Temp directory is full of temp files - over 65k files. This is certainly something to take care of. But my question is could it be the root cause of the sluggishness, or there is still something else lurking in the shadows? Edit After more digging I am zeroing in on the issue related to the size of temp directories. This article: (see the original post this thing will not let me include a second link) describes something very similar. It still does not answer the question why the server is still slow even there is no activity.

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• strange Kernel Process Threads taking over my AIX box....

  - by Paul

  When I check the Running Stats of my box I get the following: CPU User% Kern% Wait% Idle% Physc 0 37.5 57.4 0.0 5.1 0.01 2 0.0 18.3 0.0 81.7 0.00 3 0.0 22.5 0.0 77.5 0.00 4 0.0 17.0 0.0 83.0 0.00 5 0.0 20.5 0.0 79.5 0.00 6 0.0 33.7 0.0 66.3 0.00 7 0.0 4.4 0.0 95.6 0.00 8 0.0 19.3 0.0 80.7 0.00 9 0.0 22.3 0.0 77.7 0.00 10 0.0 19.2 0.0 80.8 0.00 1 0.0 1.3 0.0 98.7 0.00 11 0.0 21.8 0.0 78.2 0.00 21 0.0 62.9 0.0 37.1 0.00 12 0.0 21.1 0.0 78.9 0.00 13 0.0 22.7 0.0 77.3 0.00 14 0.0 18.1 0.0 81.9 0.00 15 0.0 21.2 0.0 78.8 0.00 16 0.0 19.1 0.0 80.9 0.00 The Kern% seems high to me and I cannot find a reason for this much Kernel activity.... Doing a deep dive into what User processes are doing I find nothing with significant CPU utilization even though TOPAS and SAR both show the same thing.... One CPU with 30-60 % user and every processor with 5-30% Kernel % utilization... What is my box doing??? here is a second sample of CPU % from TOPAS CPU User% Kern% Wait% Idle% Physc 0 67.8 31.4 0.1 0.7 0.14 2 0.0 18.2 0.0 81.8 0.00 3 0.0 20.3 0.0 79.7 0.00 4 0.0 17.3 0.0 82.7 0.00 5 0.0 20.7 0.0 79.3 0.00 6 0.0 39.2 0.0 60.8 0.00 7 0.0 5.0 0.0 95.0 0.00 8 0.0 17.9 0.0 82.1 0.00 9 0.0 22.0 0.0 78.0 0.00 10 0.0 18.0 0.0 82.0 0.00 1 0.0 0.7 0.0 99.3 0.02 11 0.0 21.7 0.0 78.3 0.00 21 0.0 21.7 0.0 78.3 0.00 12 0.0 17.0 0.0 83.0 0.00 13 0.0 21.1 0.0 78.9 0.00 14 0.0 17.8 0.0 82.2 0.00 15 0.0 21.8 0.0 78.2 0.00 16 0.0 17.6 0.0 82.4 0.00 Any ideas to help identify what is running in the Kernel Space would be great....

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• Server down at 23:26 every night

  - by miccet

  We are having a big problem with our sites stability the last couple of weeks and after endless hours of troubleshooting I don't get anywhere. So I turn to you dear community. Setup: 2 x VPS servers - Front end, 8 core, 8G RAM. - Database, 5 core, 3G RAM. Both running Ubuntu. Ruby on Rails EE with Passenger 3 and Rails 2.3.11. MySQL 5.1.67. The problem is that each night, at the exact same time (23:26) the SQL server suddenly shows a processlist full of COMMIT with an increasing Time. After 30-40 seconds (can go longer) a wave seems processed and the site responds for a few seconds before it repeats. During this hick up the database server load spikes while the front end is relaxing. I have looked at slow queries, but is not finding any locks or other unusual queries ran at this time. I have looked at iotop at the time of the halt and there is no activity from mysql. I also tried turning off query_cache and messed around with the mysql configuration file without much change. Any ideas?

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• Windows 7 "freezes" (chills?), and then "unfreezes" for about 1 minute.

  - by gbc001

  Hi, I have an Acer Timeline 1810T netbook (4GB RAM) with Windows 7 x64. About once or twice a day, it "freezes" - the reason i put this in quotation marks is that it does not really freeze, as in you cant move mouse, etc. I can move my mouse and jump between different applications, but I cant use the applications for anything. So I can jump between notepad and Firefox, but I cant browse to a new web page. I have been trying to determine the source of this misery for a while now, and I suspect it has something to do with the hard drive - indirectly if not directly. Here are some screen shots of the resource monitor during a "freeze" and during normal operation: Freeze: http://imgur.com/Gcgq1.jpg Normal operation: imgur.com/mlHaI.jpg As you can see, CPU is fine during freeze, but the disk is going bananas.. Does anyone have an idea of what these reading mean, or about the problem in general? There seems to be no specific activity that sets this off - it can be during browsing, or during media playback with nothing else open. Very appreciative of any help!

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• How can I document and automate a system's configuration?

  - by Diomidis Spinellis

  Having a system's configuration represented by its current state is risky, inefficient, and opaque. At some point you may be left with an unsupported system and no upgrade path. Then configuring a new system compatible with the old is a process or trial and error. Furthermore, if at some point the system is damaged the only option is to go back to the most recent full backup, and try to remember what changes followed from that point. Also, the only way to create a system compatible with the original is through a complete dump/restore. Finally, in such a setup there's no way to know how you solved a particular problem; the only thing you can do is to look at the corresponding configuration files and try to guess what you changed to achieve the desired effect. Currently for each system I maintain, I keep a log file where I record all system administration activity, starting from the installation: installation options, added packages, changes in configuration files, updates, problem fixes etc. In theory this allows me to (manually) replay all changes to arrive at the current state, or to unroll an erroneous change by executing the reverse commands. However, this process is also inefficient, error-prone, and relies on human judgment. Another thing I've tried is to put /etc configuration files under version control with git. This helps me document the changes automatically and also apply them on a clean setup. But it's not without problems: git has to run under sudo, passwords and private keys may be stored in the repository, installed packages can't be meaningfully tracked, and git will have a fit if I try to extend this approach to all the system's directories. I've also thought about performing all changes through shell scripts or makefiles, but I think this process will require a lot of effort and will be fragile. Are there some better methods or tools that I'm missing?

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• Windows 8 doesn't start up after installation

  - by Raj BD

  I have a DELL INSPIRON n5110 machine running Windows 7 Home Premium 64-bit. It has 6GB of RAM and 500 GB hard disk capable to run any Windows and Linux system. And I recently attempted to install Windows 8 in the machine. Installation goes fine and smooth until the final stage when windows is done installing and GETS DEVICES READY. When GETTNG DEVICES READY reaches about 60%, the screen goes blank with the machine running. After a while it reboots. And after the new Windows Logo with dotted circles are done showing up, the screen goes blank again (when we'd expect login screen to show up). There is not even a cursor. I can see the HARD DISK ACTIVITY LED blinking but nothing shows up in the screen. I've tried CLEAN INSTALL several times. The DVD is fine, it installed and worked well in my friends' laptop PCs. I tried installing both PRO version and ENTERPRISE version and both 32-bit and 64-bit. But the problem was same everytime. Finally, I had to reinstall Windows 7 which installed and ran without any problem. The problem, we can guess, is GRAPHICS perhaps. I have Intel SandyBridge Graphics Mobile Chipset (Intel HD Graphics 3000). But if Windows 7 and Linux distrubutions like Mint and BackTrack can run on the machine, why on earth, would Windows 8 not run?

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• Error message: "Two different contracts have the same ConfigurationName" when downloading wsdl from

  - by rwwilden

  I get the following error message when I try to use svcutil to generate a client proxy for a xamlx file that is hosted by AppFabric beta 2: Two different contracts have the same ConfigurationName I understand the message, however, I cannot find its cause or how to fix it. I'm following the 'Introduction to Workflow Services' lab from the VS2010RC training kit. The web application has two services: SubmitApplication.xamlx and EducationScreening.xamlx. I'm not sure why but both of them have four endpoints. If I take a look via the AppFabric Dashboard in IIS Mgmt Studio: basicHttpBinding (Contract: *) (Type: Application(Default)) netNamedPipeBinding (Contract: System.ServiceModel.Activities.IWorkflowInstanceManagement) (Type: System (workflowControlEndpoint)) netNamedPipeBinding (Contract: *) (Type: Application (Default)) serviceMetadataHttpGetBinding (Contract: serviceMetadataHttpGetContract) (Type: System (serviceMetadataEndpoint)) When taking a look at the SubmitApplication.xamlx in a browser, I see the following stacktrace: [InvalidOperationException: Two different contracts have the same ConfigurationName.] System.ServiceModel.Activities.WorkflowServiceHost.CreateDescription(IDictionary`2& implementedContracts) +361 System.ServiceModel.ServiceHostBase.InitializeDescription(UriSchemeKeyedCollection baseAddresses) +174 System.ServiceModel.Activities.WorkflowServiceHost.InitializeDescription(WorkflowService serviceDefinition, UriSchemeKeyedCollection baseAddresses) +82 System.ServiceModel.Activities.WorkflowServiceHost.InitializeFromConstructor(WorkflowService serviceDefinition, Uri[] baseAddresses) +206 System.ServiceModel.Activities.Activation.WorkflowServiceHostFactory.CreateWorkflowServiceHost(WorkflowService service, Uri[] baseAddresses) +43 System.ServiceModel.Activities.Activation.WorkflowServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +974 System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +1423 System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +50 System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +1132 [ServiceActivationException: The service '/HRApplicationServices/SubmitApplication.xamlx' cannot be activated due to an exception during compilation. The exception message is: Two different contracts have the same ConfigurationName..] System.Runtime.AsyncResult.End(IAsyncResult result) +889824 System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +179150 System.Web.AsyncEventExecutionStep.OnAsyncEventCompletion(IAsyncResult ar) +107 Can anyone tell me what I'm doing wrong? I haven't configured any of the bindings myself. The BasicHttpBinding is what you get by default in .NET 4 when hosting a service inside a web application. The other bindings are configured by AppFabric. I can't find their configuration anywhere. Kind regards, Ronald Wildenberg

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• Instructions on using TortoiseGit to interact with an SVN repository?

  - by markerikson

  I've been using TortoiseSVN on Windows for years with local filesystem repositories for my own projects. I'm planning to start collaborating with a friend on one of the projects, and will be shifting the repository to my own website. I've read a lot of "git beats SVN!" posts over the last couple years, and figured I ought to at least see what the fuss was about. Some research turned up the "git svn" command, and that TortoiseGit claims to have some level of git-svn support. I like the idea of keeping the SVN repository, and doing some local commits or branches with git before committing them to the repository. The "shelve" command also sounds useful. Unfortunately, while there's a number of CLI git-svn tutorials, there's nothing for TortoiseGit (which admittedly seems to be still in early development). As a result, I'm having problems trying to figure out what workflow I need to get these pieces to cooperate. I have an SVN repository in D:\Projects\repositories\MyProject. I created D:\Projects\temp\gittest, and tried to do a TortoiseGit "Git Clone" of the repository. From there, I've had issues trying to indicate the location of the trunk/branches/tags folders (which are just the standard layout in my repository). I was only able to get useful results when I left those unchecked. When I did seem to get the git repository started correctly, I was able to make some changes and do a couple git commits, but then had problems doing an SVN DCommit. So, I'm hoping someone out there can provide a reasonably detailed set of instructions on how to correctly use TortoiseGit with an existing SVN repository (with the repository on either the local filesystem or on a remote server). No "don't use SVN!" responses, please - I'm interested in learning how to get these two pieces to work together. If you feel TortoiseGit's SVN support isn't mature enough to make this work, that would also be useful information. Thanks!

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• What is the difference between System.Speech.Recognition and Microsoft.Speech.Recognition?

  - by Michael

  There are two similar namespaces and assemblies for speech recognition in .NET. I’m trying to understand the differences and when it is appropriate to use one or the other. There is System.Speech.Recognition from the assembly System.Speech (in System.Speech.dll). System.Speech.dll is a core DLL in the .NET Framework class library 3.0 and later There is also Microsoft.Speech.Recognition from the assembly Microsoft.Speech (in microsoft.speech.dll). Microsoft.Speech.dll is part of the UCMA 2.0 SDK I find the docs confusing and I have the following questions: System.Speech.Recognition says it is for "The Windows Desktop Speech Technology", does this mean it cannot be used on a server OS or cannot be used for high scale applications? The UCMA 2.0 Speech SDK ( http://msdn.microsoft.com/en-us/library/dd266409%28v=office.13%29.aspx ) says that it requires Microsoft Office Communications Server 2007 R2 as a prerequisite. However, I’ve been told at conferences and meetings that if I do not require OCS features like presence and workflow I can use the UCMA 2.0 Speech API without OCS. Is this true? If I’m building a simple recognition app for a server application (say I wanted to automatically transcribe voice mails) and I don’t need features of OCS, what are the differences between the two APIs?

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• GIT repository layout for server with multiple projects

  - by Paul Alexander

  One of the things I like about the way I have Subversion set up is that I can have a single main repository with multiple projects. When I want to work on a project I can check out just that project. Like this \main \ProductA \ProductB \Shared then svn checkout http://.../main/ProductA As a new user to git I want to explore a bit of best practice in the field before committing to a specific workflow. From what I've read so far, git stores everything in a single .git folder at the root of the project tree. So I could do one of two things. Set up a separate project for each Product. Set up a single massive project and store products in sub folders. There are dependencies between the products, so the single massive project seems appropriate. We'll be using a server where all the developers can share their code. I've already got this working over SSH & HTTP and that part I love. However, the repositories in SVN are already many GB in size so dragging around the entire repository on each machine seems like a bad idea - especially since we're billed for excessive network bandwidth. I'd imagine that the Linux kernel project repositories are equally large so there must be a proper way of handling this with Git but I just haven't figured it out yet. Are there any guidelines or best practices for working with very large multi-project repositories?

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• "You do not have permissions to do this operation. Ask your website administrator to change your pem

  - by user288728

  I need some help regarding the above title. After applying SP1 pack on our SharePoint Server 2007 (MOSS 3.0) the workflows aren't working anymmore on one of the WebApplications (located in SSP2) Workflows work, however on other existing applications (on SSP1 or SSP2) or newly created applications (on SSP1 or SSP2). Details of error: 1. Default / Built in SharePoint Workflows are not starting 2. Sharepoint Designer Workflows throwing the following error message: "You do not have permissions to do this operation. Ask your website administrator to change your pemissions and then try again, or log on with another account that has this permission. To log on with another user account click ok. " 3. Before applying the SP1 on MOSS the workflows were working perfectly fine on this WebApplication. so far: 1. I am logged in as Administrator (bot on Sharepoint site or when working with Sharepoint Designer). 2. Administrator is included in the list Site Collection Administrators 3. I noticed in Sharepoint designer that the username used for creating the workflow is 'converted' into SHAREPOINT\system (in the Modified By Column). Has anybody come accross/fixed this error? Any help much appreciated. Thanks D

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• R and version control for the solo data analyst

  - by Jeromy Anglim

  Many data analysts that I respect use version control. For example: http://github.com/hadley/ See comments on http://permut.wordpress.com/2010/04/21/revision-control-statistics-bleg/ However, I'm evaluating whether adopting a version control system such as git would be worthwhile. A brief overview: I'm a social scientist who uses R to analyse data for research publications. I don't currently produce R packages. My R code for a project typically includes a few thousand lines of code for data input, cleaning, manipulation, analyses, and output generation. Publications are typically written using LaTeX. With regards to version control there are many benefits which I have read about, yet they seem to be less relevant to the solo data analyst. Backup: I have a backup system already in place. Forking and rewinding: I've never felt the need to do this, but I can see how it could be useful (e.g., you are preparing multiple journal articles based on the same dataset; you are preparing a report that is updated monthly, etc) Collaboration: Most of the time I am analysing data myself, thus, I woudln't get the collaboration benefits of version control. There are also several potential costs involved with adopting version control: Time to evaluate and learn a version control system A possible increase in complexity over my current file management system However, I still have the feeling that I'm missing something. General guides on version control seem to be addressed more towards computer scientists than data analysts. Thus, specifically in relation to data analysts in circumstances similar to those listed above: Is version control worth the effort? What are the main pros and cons of adopting version control? What is a good strategy for getting started with version control for data analysis with R (e.g., examples, workflow ideas, software, links to guides)?

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• Ideas for OpenSource CMS in ASP.NET MVC

  - by rajesh pillai

  I am in the process of collecting ideas for building an opensource CMS based on ASP.net framework. I have choosen ASP.NET MVC with Jquery as the tool to develop this. I have made this as community wiki. Background: Most of the good CMS that is available is built on PHP, though off late CMS built on ASP.net framework seems to be cropping up. I would like to collect ideas/suggestion/expectations from an opensource CMS system for ASP.net platform. I am looking for expectation from technology and features that you wish could find in a modern CMS and any other thoughts/ideas that comes to your mind. Your input would be of great help in this direction. Meanwhile I am also reviewing many opensource CMS system built on ASP.net as well as MS Office Sharepoint to get ideas and I would update my findings here for your reference. The following are some of the opensource CMS/BlogEngines that I am in the process of reviewing. -Oxite (ASP.net MVC) : This is the new kid on the block -Wordpress -BlogEngine.net -Umbraco Some of the features that I can think of is noted below Simplified content creation Support Multiple content author Metadata feature Workflow engine Simplified deployment List based contents (sharepoint like) Customizable URL's Support content Caching Roles (contenauthor, contentpublisher etc) Support different types of content (like html, txt, document, image, videos) Skinnable (support extensible themes) Localization & Globalization Unlimited nesting of categories Readymade template for blog, forums,survey. Good documentation You can add your points or add some depth to any of the above feature.

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• Database Change Management - Setup for Initial Create Scripts, Subsequent Migration Scripts

  - by Martin Aatmaa

  I've got a database change management workflow in place. It's based on SQL scripts (so, it's not a managed code-based solution). The basic setup looks like this: Initial/ Generate Initial Schema.sql Generate Initial Required Data.sql Generate Initial Test Data.sql Migration 0001_MigrationScriptForChangeOne.sql 0002_MigrationScriptForChangeTwo.sql ... The process to spin up a database is to then run all the Initlal scripts, and then run the sequential Migration scripts. A tool takes case of the versioning requirements, etc. My question is, in this kind of setup, is it useful to also maintain this: Current/ Stored Procedures/ dbo.MyStoredProcedureCreateScript.sql ... Tables/ dbo.MyTableCreateScript.sql ... ... By "this" I mean a directory of scripts (separated by object type) that represents the create scripts for spinning up the current/latest version of the database. For some reason, I really like the idea, but I can't concretely justify it's need. Am I missing something? The advantages would be: For dev and source control, we would have the same object-per-file setup that we're used to For deployment, we can spin up a new DB instance to the latest version either by running the Initial+Migrate, or by running the scripts from Current/ For dev, we do not need a DB instance running in order to do development. We can do "offline" development on the Current/ folder. The disadvantages would be: For each change, we need to update the scripts in the Current/ folder, as well as create a Migration script (in the Migration/ folder) Thanks in advance for any input!

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• Best practice: git, github, lighthouse and 2 developers

  - by Alxandr

  I'm setting up a new project and plan on using git and github for sourcecontroll and hosting of repo and lighthouse for bugtracking. I've been working with git for some while now, but only been using it for more of a backup solution than collaborate coding solution. Also, I've noticed that in github you can setup a servicehook to lighthouse so that whenever you push to github it notifies lighthouse of the changes. This uses a token for user-authentication and has the ability to change tickets to resolved etc. However, this token I believe functions that way so that whenever a user pushes to the repo (dosn't matter who), it's the owner of the repo that "updates" to lighthouse. This is a problem. So, I believe it is necessary with 2 separate repos at github (one for each dev), and I'm wondering about the workflow that should be used. Any1 care to shred any light on this matter? Like when to pull and push (and where), and how to make the two github repos in sync or something like that? Or another solution to the problem altogether.

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• Storing a digital signature for bookings on a web based system

  - by Duncan

  I have a web based bookings system built for a UK higher education client to allow students to sign out equipment (laptops, camera's etc). It's been in use successfully for a couple of years, in the current workflow equipment is collected and the booking is printed, signed by the student and kept until the equipment is returned. They are emailed a pdf copy of the booking and reminders if equipment is outstanding. Students can login and prebook equipment using their university LDAP credentials, the booking is then authorised by staff for later collection, but can also walk in and have equipment booked out by staff. They would like to remove the signed paper part of the process and replace this with some sort of digital signature. The suggestion was a graphics tablet but with a web based system this would require a local software package and in my view be impractical. My thought is that students would enter their LDAP username and password upon collection of the equipment, verifying their identity and effectively digitally signing the booking. My question is what would be best to store as a signature or whether to simply authenticate the user and use a boolean flag to indicate that this has been done could be deemed sufficient?

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• FxCop hates my usage of MVVM

  - by Dave

  I've just started to work with FxCop to see how poorly my code does against its full set of rules. I'm starting off with the "Breaking" rules, and the first one I came across was CA2227, which basically says that you should make a collection property's setter readonly, so that you can't accidentally change the collection data. Since I'm using MVVM, I've found it very convenient to use an ObservableCollection with get/set properties because it makes my GUI updates easy and concise in the code-behind. However, I can also see what FxCop is complaining about. Another situation that I just ran into is with WF, where I need to set the parameters when creating the workflow, and I'd hate to have to write a wrapper class around the collection I'm using just to avoid this particular error message. For example, here's a sample runtime error message that I get when I make properties readonly: The activity 'MyWorkflow' has no public writable property named 'MyCollectionOfStuff' What are you opinions on this? I could either ignore this particular error, but that's probably not good because I could conceivably violate this rule elsewhere in the code where MVVM doesn't apply (model only code, for example). I think I could also change it from a property to a class with methods to manipulate the underlying collection, and then raise the necessary notification from the setter method. I'm a little confused... can anyone shed some light on this?

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• Publishing toolchain

  - by Marcelo de Moraes Serpa

  Hello all, I have a book project which I'd like to start sooner than later. This would follow an agile-like publishing workflow, i.e: publish early and often. It is meant to be self-publsihed by me and I'm not really looking to paper-publish it, even though we never know. If I weren't a geek, I'd probably have already started writting in Word or any other WYSIWYG tool and just export to PDF. However, we know it is not the best solution, and emacs rules my text-editing life, so, the output format should be as simple as possible and be text-based. I've thought about the following options: 1) Use orgmode and export to PDF; 2) Use markdown mode and export to PDF; 3) Use something similar to what the guys @ Pragmatic Progammers do: A XML + XSLT + LaTeX. More complex, but much more control over the style. Any other ideas / references ? I want to start writting as soon as possible. In fact, I already have a draft in an org-formatted file. However, I do want to have and use the full power of LaTex later on to format it the way I want and make it look fabulous :) Thanks in advance, Marcelo.

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• Dynamic State Machine in Ruby? Do State Machines Have to be Classes?

  - by viatropos

  Question is, are state machines always defined statically (on classes)? Or is there a way for me to have it so each instance of the class with has it's own set of states? I'm checking out Stonepath for implementing a Task Engine. I don't really see the distinction between "states" and "tasks" in there, so I'm thinking I could just map a Task directly to a state. This would allow me to be able to define task-lists (or workflows) dynamically, without having to do things like: aasm_event :evaluate do transitions :to => :in_evaluation, :from => :pending end aasm_event :accept do transitions :to => :accepted, :from => :pending end aasm_event :reject do transitions :to => :rejected, :from => :pending end Instead, a WorkItem (the main workflow/task manager model), would just have many tasks. Then the tasks would work like states, so I could do something like this: aasm_initial_state :initial tasks.each do |task| aasm_state task.name.to_sym end previous_state = nil tasks.each do |tasks| aasm_event task.name.to_sym do transitions :to => "#{task.name}_phase".to_sym, :from => previous_state ? "#{task.name}_phase" : "initial" end previous_state = state end However, I can't do that with the aasm gem because those methods (aasm_state and aasm_event) are class methods, so every instance of the class with that state machine has the same states. I want it so a "WorkItem" or "TaskList" dynmically creates a sequence of states and transitions based on the tasks it has. This would allow me to dynamically define workflows and just have states map to tasks. Are state machines ever used like this?

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• How do I create a C# .NET Web Service that Posts items to a users Facebook Wall?

  - by Jourdan

  I'm currently toying around with the Clarity .NET Facebook API but am finding certain situations with authentication to be kind of limiting. I keep going through the tutorials but always end up hitting a brick wall with what I want to do. Perhaps I just cannot do it? I want to make a Web Service that takes in the require credentials (APIKey, SecretKey, UsersId (or Session Key?) and whatever else I would need), and then do various tasks: Post to users wall, add events etc. The problem I am having is this: The current documentation, examples and support provide a way to do this within the context of a Web site. Within this context, the required "connect" popup can be initiated and allow the user to authenticate and and connect the application. From that point on the Web can go on with its business to do what it needs to do. If I close the browser and come back to the page, I have to push the connect button again. Except this time, since I was already logged into facebook, I don't have to go through the whole connection process. But still ... How do applications like Tweetdeck get around this? They seemingly have you connect once, when you install their application, and you don't have to do it again. I would assume that this same idea would have to applied towards making a web service because: You don't know what context the user is in when making the Web service call. The web service methods being called could be coming from a Windows Form app, or code behind in a workflow.

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• Cocoa memory management

  - by silvio

  At various points during my application's workflow, I need so show a view. That view is quite memory intensive, so I want it to be deallocated when it gets discarded by the user. So, I wrote the following code: - (MyView *)myView { if (myView != nil) return myView; myView = [[UIView alloc] initWithFrame:CGRectZero]; // allocate memory if necessary. // further init here return myView; } - (void)discardView { [myView discard]; // the discard methods puts the view offscreen. [myView release]; // free memory! } - (void)showView { view = [self myView]; // more code that puts the view onscreen. } Unfortunately, this methods only works the first time. Subsequent requests to put the view onscreen result in "message sent to deallocated instance" errors. Apparently, a deallocated instance isn't the same thing as nil. I thought about putting an additional line after [myView release] that reads myView = nil. However, that could result in errors (any calls to myView after that line would probably yield errors). So, how can I solve this problem?

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