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  • Identifying test machines in analytics logs

    - by RTigger
    We're just beginning to add analytics to our SaaS application, to begin (among other things) billing clients based on usage. The problem we're running into is there's a few circumstances where our support team will simulate a log in into production to try to reproduce reported issues with a client's configuration. When they log in, an entry will be made into our analytics logs that their specific account has logged in, which we use to calculate billing. A few ideas we had to solve this: 1) We log IP addresses as well as machine keys for each PC that logs in - we could filter out known IP addresses and/or machine keys belonging to support. The drawback is we have to maintain a list of keys / addresses manually. 2) If support (or anyone else internal) runs our application in debug mode (as opposed to release), it will not report analytics. This is fine, as long as support / anyone else remembers to switch to debug mode. 3) Include some sort of reg key / similar setting required to be set when configuring a production system in order to send analytics. Again, fine, as long as our infrastructure team remembers to set the reg key or setting. All of these approaches require some sort of human involvement, which we all know can be iffy at best. Has anyone run into a similar situation? Is there an automated approach to this problem? (PS Of course, we shouldn't be testing in production, but there are a few one-off instances with customer set up that we can't reproduce without logging in as them in production. This is the only time we do so, and this is the case I'm talking about in this question.)

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  • System Issues and Major Malfuctions after Failed hibernation Exit

    - by Sarah Seguin
    I have a HP G71-340US that went into hibernation mode for a while and when I tried coming out of it, I got an error message: You're computer cannot come out if hibernation . Status: 0xc000009a Info: A fatal error occurred processing the restoration data. File: \hiberfil.sys Any information that was not saved before the computer went into hybernation will be lost enter=continue So I hit continue and it ran soooo super slow it. It was seriously crawling. Finally I gave up and turned it off manually (IE press and hold the button). It's been a week or two since then and EVERY SINGLE TIME I have tried to to do ANYTHING it takes forever. When I say forever, I literally mean takes 5-7 minutes to load the internet, then the page itself, then to click a link, so on so forth. Eventually everything just goes not responding and I have to give up (4-6 HOURS later). I also cannot access my thumb/jump drives once I've managed to load windows. I was going to try runing malware bytes incase of a virus, but it's windows explorer developes errors and goes not responding on me. Currently I'm running scan disk or check disk and like every file is coming back unreadable. I let it run the last 2 hours straight in chkdesk and I'm only at 6 percent with around 500+ errors and still going. Yes, I've taken logs of the errors via cell phone camera and patience. A week or two prior to this happening I had to change our the hard drive due to blunt force trama next to the mouse. OH! Running on Windows 7: ) And I've tried loading the computer in safe mode and it makes absolutely no difference. Any and all help would be appreciated. I really don't know what to do from here and I'm kind of freaking out. I've googled different part of the error and things that I've done/seen and there are so many different answers/topics that I thought it best to just post the questions.

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  • Vim: auto-comment in new line

    - by padde
    Vim automatically inserts a comment when I start a new line from a commented out line, because I have set formatoptions=tcroql. For example (cursor is *): // this is a comment* and after hitting <Enter> (insert mode) or o (normal mode) i am left with: // this is a comment // * This feature is very handy when writing long multi-line comments, but often I just want a single line comment. Now if I want to end the comment series I have several options: hit <Esc>S hit <BS> three times Both of these afford three keystrokes, taken together with the <Enter> this means four keystrokes for a new line, which I think is too much. Ideally, I would like to just hit <Enter> a second time to be left with: // this is a comment * It is important that the solution will also work with different indentation levels, i.e. int main(void) { // this is a comment* } hit <Enter> int main(void) { // this is a comment // * } hit <Enter> int main(void) { // this is a comment * } I think I have seen this feature in some text editor a few years ago but I do not recall which one it was. Is anyone aware of a solution that will do this for me in Vim? Pointers in the right direction on how to roll my own solution are also very welcome.

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  • Can't get 1440x900 resolution with GRUB2 although vbeinfo says it's available

    - by TomSW
    I'm trying to use GRUB2 in graphical mode with 1440x900 resolution, but the result is always garbled nonsense: the highest resolution I can get is 1280x800. Word is from googling that long as vbeinfo lists a resolution, GRUB2 can use it. This doesn't seem to be true: vbeinfo says that 1440x900 is available but it doesn't work. Testing it from the GRUB2 command line: set gxfmode=1440x900 terminal_output gfxterm # -> garbled nonsense # back to trusty 640x480 terminal_output console The graphics card is an Intel GM965. Once linux boots the framebuffer switches to 1440x900. Added after epheminent's reply and various experiments vbeinfo lists two sets of modes. The first set runs from 0x160 to 0x16b, with resolutions 768x480, 960x600, 1280x800 and 1440x900 Then - after a bunch of text-only modes - the second set, containing resolutions 1024x768, 800x600, and 640x480 The first set of modes aren't altered by 915resolution. They all work except 1440x900. The resolution of modes in the second set can be altered using the 915resolution module / command available in GRUB2 = 1.99. # in /boot/grub/grub.cfg insmod 915resolution # 30, 32, 34 all work for me: all that varies is which modes are altered 915resolution 30 1440 900 # setting an impossible resolution changes the mode to "text-only" # in my case 1280x1024 is not supported 915resolution 30 1280 1024 Clearly, 1440x900 should just work: adding it with 915resolution is just a workaround.

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  • How to divert traffic based on hostname using HAProxy?

    - by Bosky
    I've had some initial success with HAProxy setting up a bunch of app servers listening on various other ports. I now have another webserver listening on one port, and i'd like to what changes to make to my config to flow traffic by hostname as well. The following is the current setup, assuming: my apache webserver is running at examplecom:8001 my bunch of app servers 0.0.0.0:8081, 0.0.0.0:8082 , 0.0.0.0:8083 global log 127.0.0.1 local0 log 127.0.0.1 local1 notice maxconn 4096 debug #quiet #user haproxy #group haproxy defaults log global mode http option httplog option dontlognull retries 3 redispatch maxconn 2000 contimeout 5000 clitimeout 50000 srvtimeout 50000 listen appservers 0.0.0.0:80 mode http balance roundrobin option httpclose option forwardfor #option httpchk HEAD /check.txt HTTP/1.0 server inst1 0.0.0.0:8081 cookie server01 check inter 2000 fall 3 server inst2 0.0.0.0:8082 cookie server02 check inter 2000 fall 3 server inst3 0.0.0.0:8083 cookie server01 check inter 2000 fall 3 server inst4 0.0.0.0:8084 cookie server02 check inter 2000 fall 3 capture cookie vgnvisitor= len 32 (any other comments on the ^ setup are welcome.) Now I'd like to continue the same above, but in addition in case - if the hostname is myspecialtopleveldomain<dot>com, then would like to flow traffic to example<dot>com:8001 ~B

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  • Remote Desktop connection to vista vs. xp

    - by CMP
    I am trying to log into my work computer remotely. I am using Windows 7 on my laptop. I have created a vpn connection to the network, and I am doing a remote desktop connection directly to the ip of my box (192.168.xxx.yyy). If I do a remote connection to a different box, running xp, it goes into remote desktop mode immediately and I see the windows login dialog as I am used to seeing. If I try remoting to my box, which is running vista, I do not see the remote desktop mode, but an additional dialog on my local machine asking for my credentials. It defaults in my local username. It allows me to log in as a different user, but the domain it has is still my local domain, not my work domain, so none of my usernames or passwords work. There doesn't appear to be a way to change the domain. Trying to hit several more boxes, it appears to act differently on xp and vista target machines. I feel like this must be a configuration issue, but I am not sure what the problem is. Any idea on how I can connect?

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  • Install Windows 8 on SSD and Program & Users on HDD

    - by Foe
    I have been dealing with a few problems while installing Windows 8 on my computer. On my old configuration, I had Windows 7 installed on my 60Go SSD, and my programs and user data on my 1To HDD, thanks to relative links. Yet, while installing Windows 8 on my SSD, he made a small partition on my HDD "System related". Plus, I'm afraid using only links is a bit cheap, and I saw lots of people messing with their registry when trying to put user data on another drive. I read a lot about optimizing Windows 8 for SSD, putting Users on another drive, and very similar situation that didn't quite correspond to what I was trying to achieve. Here's what I tried : http://www.eightforums.com/tutorials/4275-user-profiles-relocate-another-partition-disk.html Booting on Audit mode and using an XML to relocate Users didn't work as the specified version in the file is a test one, and I don't what to enter if I'm using the last release. Booting with the install DVD in repair mode to do a copy of the User and create a relative link, resulting in an error on the logon screen while entering my password saying that "The profile can't be load" (average translation of my error from french to english) Do anyone know how to do a clean separated install of Windows 8, with OS on a drive, and the other data on a second one ? Thanks.

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  • VirtualBox bridged network not working as expected

    - by iby chenko
    I am having hard time getting Bridged network to work with VirtualBox. Idea is to have host as well as one or more guests on same LAN. Using NAT (default) I do get access to internet and any node on the LAN when working from one of the VM guests. However, no LAN node including host can access (or ping) guest in VM. I need to be able to use any guest as if it was a physical computer on the network (need to be accessed by any machine on LAN). According to my understanding of the VirtualBox documentation, this should be Bridged mode. I think I set it correctly, well, actually there is not much to it: 1. select Bridged mode in VM network setup 2. select physical NIC of the host to connect bridge to 3. start VM When I do this, each VM does get new IP address that corresponds to LAN settings : 192.168.1.100 192.168.1.102 192.168.1.103 etc. where host is 192.168.1.80 / 255.255.255.0 (IP addresses above 100 are served by DHCP server). This seem to be correct based on what I know about ethernet. From VM I can ping other nodes like 192.168.1.50 etc. and I still get ethernet access. So far so good... But I STILL cannot ping any of the other VMs (running ones of course). I cannot ping them from other VMs, from host or from other nodes on the LAN. Aside from fact that IP addresses handed to guests are now local, this still acts same as NAT. What is going on? What am I missing? Regards, I

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  • Python 2.7 and Ubuntu 10.10: X11 fails

    - by c.a.p.
    Against every recommendation I have apt-get remove python in Ubuntu 10.10 (build 2.6.24-29-server x86_64) and apt-get install python2.7 Some built-in software with python2.6 dependencies (like firefox, other minor stuff) was fixed just by apt-get reinstalling or reinstalling from source and the system was stable for one day until I rebooted. Upon booting I got the message "ubuntu is running in low-graphics mode" I have an NVIDIA Quadro NVS 295 256 running on a HP Z600 Workstation so I sudoed: apt-get --purged nvidia* apt-get --purged xserver apt-get install linux-headers-generic apt-get install nvidia-* apt-get install xserver-xorg dpkg-reconfigure xserver-xorg nvidia-xconfig upon rebooting i get the same "ubuntu is running in low-graphics mode" if I decide to tell the boot menu to restart X, the Ubuntu 10.10 "load screen" shows up and does not do anything for hours. If I "X" the screen remains black for hours; ctrl-c shows that /etc/X11/xorg.conf did not produce any errors just a warning "Type "ONE_LEVEL"...". /var/log/Xorg.0.log issues the following warnings (no errors) (WW) AllowEmptyInput is on (WW) NVIDIA(0): UBB is incompatible If I "startX" I get /usr/bin/python: can't find '__main__.py"' in '/usr/share/command-not-found' Before re-installing xserver-xorg however "startX" ran, just by changing the resolution of the tty1 console. Any hints?

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  • MacMini transmit rate stuck at 11, every other device can connect at full 54Mbit/s?

    - by chum of chance
    I have a MacMini circa 2007 that's getting very low transmit rates via wifi, 8-11. I have other devices that are getting full 54, including a MacBook Air. With everything else off, the MacMini doesn't want to seem to go any faster. Since it has been previously connected to ethernet its entire life, I was wondering if there were some settings I can change to speed up the connection. Option-clicking the network icon gives this read out: PHY Mode: 802.11g Channel: 1 (2.4 Ghz) Security: WPA2 Personal RSSI: -73 Transmit Rate: 11 My new MacBook Air has the following readout: PHY Mode: 802.11n Channel: 1 (2.4 Ghz) Security: WPA2 Personal RSSI: -66 Transmit Rate: 79 Both have full bars and the wireless router is in the same room to eliminate any obstructions from the equation. Could the MacMini be connecting at an older protocol, like 802.11b and be reporting erroneously that it is connected at 802.11g? This would explain why I haven't seen a transmit rate above 11. Any further trouble shooting I can try before buying a new USB 802.11n device? The WiFi router is a DLink DIR-615. I can see other devices, and none, even the other g connected devices, are getting below 30-40 MBit/s. What's going on here?

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  • How to turn off the display in Windows 8 without locking or making computer go to sleep?

    - by darshshah
    How to turn of the display in Windows 8 without locking or making computer go to sleep ? The problem is that when I enable ‘Turn off display after x minutes’ feature from control panel, the device goes into sleep after ‘x’ minutes. It seems that both the options – turn off display/put computer to sleep are connected. It devices goes automatically to sleep mode as soon as the display is turned off. So, is there any method to turn off the display of the device without it going into sleep mode ? Someone wrote in the microsoft forum " The whole key to this problem seems to be the "Turn off the Display" setting. If you have that set to 5 minutes, 10 minutes, 15 minutes, etc...the computer will go to sleep one minute after you lock the screen. With this setting set to "Never", it doesn't do it. So something is wrong there." I want to turnoff the display but don't want to lock the device. Is that also possible ? Thanks

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  • "Unverifiable code failed policy check" for a closed source assembly

    - by Jason
    I'm attempting to dynamically load some (purchased) assemblies from resource streams in a C# program during an MSI installation routine, but I'm getting "Unverifiable code failed policy check". I read some tips online about compiling the embedded assembly with /clr:safe, but I don't have that option. Is there a way to work around this policy check? Thanks.

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  • SharePoint 2010: CheckSuspiciousPhysicalPath exception

    - by Tommy Jakobsen
    I just installed SharePoint 2010 on my Windows Server 2008 R2 x64 server with SQL Server 2008. Everything is installed on this single server, and I configured SharePoint 2010 as described here: http://sharepoint.microsoft.com/blogs/fromthefield/Lists/Posts/Post.aspx?ID=112 Everything installed correct, and the SQL databases were created. But when I try to access the administration site through http://server:47632/_admin/adminconfigintro.aspx, I get the following exception: [HttpException] at System.Web.Util.FileUtil.CheckSuspiciousPhysicalPath(String physicalPath) at System.Web.CachedPathData.GetConfigPathData(String configPath) at System.Web.CachedPathData.GetConfigPathData(String configPath) at System.Web.CachedPathData.GetConfigPathData(String configPath) at System.Web.HttpContext.GetFilePathData() at System.Web.Configuration.CustomErrorsSection.GetSettings(HttpContext context, Boolean canThrow) at System.Web.HttpResponse.ReportRuntimeError(Exception e, Boolean canThrow, Boolean localExecute) at System.Web.HttpRuntime.FinishRequest(HttpWorkerRequest wr, HttpContext context, Exception e) The same error occurs when accessing http://server:47632/. Do you have any ideas whats causing this? I haven't been able to find anything about this issue. Edit 1: I just tried reinstalling SharePoint 2010 while monitoring the error log. When I run the configuration wizard, the following errors show up in the event log: The site /sites/Help could not be created. The following exception occurred: Dependency feature with id 5f3b0127-2f1d-4cfd-8dd2-85ad1fb00bfc for feature 'BaseSite' (id: b21b090c-c796-4b0f-ac0f-7ef1659c20ae) is not installed.. Safe mode did not start successfully. This page has encountered a critical error. Contact your system administrator if this problem persists. Safe mode did not start successfully. This page has encountered a critical error. Contact your system administrator if this problem persists. The site /sites/Help could not be created. The following exception occurred: Dependency feature with id 2ed1c45e-a73b-4779-ae81-1524e4de467a for feature 'BaseSite' (id: b21b090c-c796-4b0f-ac0f-7ef1659c20ae) is not installed.. The Execute method of job definition Microsoft.Office.InfoPath.Server.Administration.FormsMaintenanceJobDefinition (ID 59158daa-d0b6-458f-bd0a-7d1d713ac743) threw an exception. More information is included below. Access to the path 'C:\ProgramData\Microsoft\SharePoint\Config\319280433bd74178b6b1fd945c064698' is denied. The Execute method of job definition Microsoft.Office.InfoPath.Server.Administration.FormsMaintenanceJobDefinition (ID b3f45215-4d18-44f2-84bd-cc16bc339dd7) threw an exception. More information is included below. Access to the path 'C:\ProgramData\Microsoft\SharePoint\Config\319280433bd74178b6b1fd945c064698' is denied. Any ideas?

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  • Dijkstra's Bankers Algorithm

    - by idea_
    Could somebody please provide a step-through approach to solving the following problem using the Banker's Algorithm? How do I determine whether a "safe-state" exists? What is meant when a process can "run to completion"? In this example, I have four processes and 10 instances of the same resource. Resources Allocated | Resources Needed Process A 1 6 Process B 1 5 Process C 2 4 Process D 4 7

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  • Combining MVVM Light Toolkit and Unity 2.0

    - by Alan Cordner
    This is more of a commentary than a question, though feedback would be nice. I have been tasked to create the user interface for a new project we are doing. We want to use WPF and I wanted to learn all of the modern UI design techniques available. Since I am fairly new to WPF I have been researching what is available. I think I have pretty much settled on using MVVM Light Toolkit (mainly because of its "Blendability" and the EventToCommand behavior!), but I wanted to incorporate IoC also. So, here is what I have come up with. I have modified the default ViewModelLocator class in a MVVM Light project to use a UnityContainer to handle dependency injections. Considering I didn't know what 90% of these terms meant 3 months ago, I think I'm on the right track. // Example of MVVM Light Toolkit ViewModelLocator class that implements Microsoft // Unity 2.0 Inversion of Control container to resolve ViewModel dependencies. using Microsoft.Practices.Unity; namespace MVVMLightUnityExample { public class ViewModelLocator { public static UnityContainer Container { get; set; } #region Constructors static ViewModelLocator() { if (Container == null) { Container = new UnityContainer(); // register all dependencies required by view models Container .RegisterType<IDialogService, ModalDialogService>(new ContainerControlledLifetimeManager()) .RegisterType<ILoggerService, LogFileService>(new ContainerControlledLifetimeManager()) ; } } /// <summary> /// Initializes a new instance of the ViewModelLocator class. /// </summary> public ViewModelLocator() { ////if (ViewModelBase.IsInDesignModeStatic) ////{ //// // Create design time view models ////} ////else ////{ //// // Create run time view models ////} CreateMain(); } #endregion #region MainViewModel private static MainViewModel _main; /// <summary> /// Gets the Main property. /// </summary> public static MainViewModel MainStatic { get { if (_main == null) { CreateMain(); } return _main; } } /// <summary> /// Gets the Main property. /// </summary> [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic", Justification = "This non-static member is needed for data binding purposes.")] public MainViewModel Main { get { return MainStatic; } } /// <summary> /// Provides a deterministic way to delete the Main property. /// </summary> public static void ClearMain() { _main.Cleanup(); _main = null; } /// <summary> /// Provides a deterministic way to create the Main property. /// </summary> public static void CreateMain() { if (_main == null) { // allow Unity to resolve the view model and hold onto reference _main = Container.Resolve<MainViewModel>(); } } #endregion #region OrderViewModel // property to hold the order number (injected into OrderViewModel() constructor when resolved) public static string OrderToView { get; set; } /// <summary> /// Gets the OrderViewModel property. /// </summary> public static OrderViewModel OrderViewModelStatic { get { // allow Unity to resolve the view model // do not keep local reference to the instance resolved because we need a new instance // each time - the corresponding View is a UserControl that can be used multiple times // within a single window/view // pass current value of OrderToView parameter to constructor! return Container.Resolve<OrderViewModel>(new ParameterOverride("orderNumber", OrderToView)); } } /// <summary> /// Gets the OrderViewModel property. /// </summary> [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic", Justification = "This non-static member is needed for data binding purposes.")] public OrderViewModel Order { get { return OrderViewModelStatic; } } #endregion /// <summary> /// Cleans up all the resources. /// </summary> public static void Cleanup() { ClearMain(); Container = null; } } } And the MainViewModel class showing dependency injection usage: using GalaSoft.MvvmLight; using Microsoft.Practices.Unity; namespace MVVMLightUnityExample { public class MainViewModel : ViewModelBase { private IDialogService _dialogs; private ILoggerService _logger; /// <summary> /// Initializes a new instance of the MainViewModel class. This default constructor calls the /// non-default constructor resolving the interfaces used by this view model. /// </summary> public MainViewModel() : this(ViewModelLocator.Container.Resolve<IDialogService>(), ViewModelLocator.Container.Resolve<ILoggerService>()) { if (IsInDesignMode) { // Code runs in Blend --> create design time data. } else { // Code runs "for real" } } /// <summary> /// Initializes a new instance of the MainViewModel class. /// Interfaces are automatically resolved by the IoC container. /// </summary> /// <param name="dialogs">Interface to dialog service</param> /// <param name="logger">Interface to logger service</param> public MainViewModel(IDialogService dialogs, ILoggerService logger) { _dialogs = dialogs; _logger = logger; if (IsInDesignMode) { // Code runs in Blend --> create design time data. _dialogs.ShowMessage("Running in design-time mode!", "Injection Constructor", DialogButton.OK, DialogImage.Information); _logger.WriteLine("Running in design-time mode!"); } else { // Code runs "for real" _dialogs.ShowMessage("Running in run-time mode!", "Injection Constructor", DialogButton.OK, DialogImage.Information); _logger.WriteLine("Running in run-time mode!"); } } public override void Cleanup() { // Clean up if needed _dialogs = null; _logger = null; base.Cleanup(); } } } And the OrderViewModel class: using GalaSoft.MvvmLight; using Microsoft.Practices.Unity; namespace MVVMLightUnityExample { /// <summary> /// This class contains properties that a View can data bind to. /// <para> /// Use the <strong>mvvminpc</strong> snippet to add bindable properties to this ViewModel. /// </para> /// <para> /// You can also use Blend to data bind with the tool's support. /// </para> /// <para> /// See http://www.galasoft.ch/mvvm/getstarted /// </para> /// </summary> public class OrderViewModel : ViewModelBase { private const string testOrderNumber = "123456"; private Order _order; /// <summary> /// Initializes a new instance of the OrderViewModel class. /// </summary> public OrderViewModel() : this(testOrderNumber) { } /// <summary> /// Initializes a new instance of the OrderViewModel class. /// </summary> public OrderViewModel(string orderNumber) { if (IsInDesignMode) { // Code runs in Blend --> create design time data. _order = new Order(orderNumber, "My Company", "Our Address"); } else { _order = GetOrder(orderNumber); } } public override void Cleanup() { // Clean own resources if needed _order = null; base.Cleanup(); } } } And the code that could be used to display an order view for a specific order: public void ShowOrder(string orderNumber) { // pass the order number to show to ViewModelLocator to be injected //into the constructor of the OrderViewModel instance ViewModelLocator.OrderToShow = orderNumber; View.OrderView orderView = new View.OrderView(); } These examples have been stripped down to show only the IoC ideas. It took a lot of trial and error, searching the internet for examples, and finding out that the Unity 2.0 documentation is lacking (at best) to come up with this solution. Let me know if you think it could be improved.

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  • Singleton pattern in web applications

    - by ryudice
    I'm using a singleton pattern for the datacontext in my web application so that I dont have to instantiate it every time, however I'm not sure how web applications work, does IIS open a thread for every user connected? if so, what would happend if my singleton is not thread safe? Also, is it OK to use a singleton pattern for the datacontext? Thanks.

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  • Interpreting w3wp.exe thread-infos, does mscorwks.dll!StrongNameErrorInfo+0x7688 has a negative impa

    - by Robert
    I am trying to interpret the meaning of "mscorwks.dll!StrongNameErrorInfo+0x7688". I guess it means, that the assembly loaded by the mscorworks.dll has no StrongName? If yes, does this have any negative impact for a web application? Is it safe to assume that the thread count of 107 means, that web application has needed a maximum of 107 concurrent threads to handle incoming requests?

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  • T-SQL: @@IDENTITY, SCOPE_IDENTITY(), OUTPUT and other methods of retrieving last identity

    - by Terrapin
    I have seen various methods used when retrieving the value of a primary key identity field after insert. declare @t table ( id int identity primary key, somecol datetime default getdate() ) insert into @t default values select SCOPE_IDENTITY() --returns 1 select @@IDENTITY --returns 1 Returning a table of identities following insert: Create Table #Testing ( id int identity, somedate datetime default getdate() ) insert into #Testing output inserted.* default values What method is proper or better? Is the OUTPUT method scope-safe? The second code snippet was borrowed from SQL in the Wild

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  • Matlab Simulink version control with multiple developers

    - by Jon Mills
    We're using Matlab Simulink for model development (and Real-Time Workshop autocoding) within a team of several developers. We currently use Visual Source Safe (yes, I know its terrible) for version control, using locks to prevent conflicting changes. We'd like to migrate our programme to a different version control system (svn, hg or git), but we're concerned about performing merges and diffs on Simulink .mdl files. Does anybody have useful experience in performing merges on Simulink files?

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  • How many inserts can you have in a sql transaction.

    - by Mav
    I have a task to do that will require me using a transaction to ensure that many inserts will be completed or the entire update rolled back. I am concerned about the amount of data that needs to be inserted in this transaction and whether this will have a negative affect on the server. We are looking at about 10,000 records in table1 and 60,0000 records into table2. Is this safe to do in a single transaction?

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  • Can I query DOM Document with xpath expression from multiple threads safely?

    - by Dan
    I plan to use dom4j DOM Document as a static cache in an application where multiples threads can query the document. Taking into the account that the document itself will never change, is it safe to query it from multiple threads? I wrote the following code to test it, but I am not sure that it actually does prove that operation is safe? package test.concurrent_dom; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.dom4j.Node; /** * Hello world! * */ public class App extends Thread { private static final String xml = "<Session>" + "<child1 attribute1=\"attribute1value\" attribute2=\"attribute2value\">" + "ChildText1</child1>" + "<child2 attribute1=\"attribute1value\" attribute2=\"attribute2value\">" + "ChildText2</child2>" + "<child3 attribute1=\"attribute1value\" attribute2=\"attribute2value\">" + "ChildText3</child3>" + "</Session>"; private static Document document; private static Element root; public static void main( String[] args ) throws DocumentException { document = DocumentHelper.parseText(xml); root = document.getRootElement(); Thread t1 = new Thread(){ public void run(){ while(true){ try { sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } Node n1 = root.selectSingleNode("/Session/child1"); if(!n1.getText().equals("ChildText1")){ System.out.println("WRONG!"); } } } }; Thread t2 = new Thread(){ public void run(){ while(true){ try { sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } Node n1 = root.selectSingleNode("/Session/child2"); if(!n1.getText().equals("ChildText2")){ System.out.println("WRONG!"); } } } }; Thread t3 = new Thread(){ public void run(){ while(true){ try { sleep(3); } catch (InterruptedException e) { e.printStackTrace(); } Node n1 = root.selectSingleNode("/Session/child3"); if(!n1.getText().equals("ChildText3")){ System.out.println("WRONG!"); } } } }; t1.start(); t2.start(); t3.start(); System.out.println( "Hello World!" ); } }

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  • ArrayCollection versus Vector Objects in FLEX

    - by Vetsin
    Can anyone tell me the applicable differences between an ArrayCollection and a Vector in flex? I'm unsure if I should be using one over the other. I saw that Vector is type safe and that makes me feel better, but are there disadvantages? public var ac:ArrayCollection = new ArrayCollection(); versus public var vec:Vector.<String> = new Vector.<String>(); Thanks.

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  • Ubuntu 13.10 Symfony installation date time issue

    - by Sambo
    I'm installing Symfony on my Ubuntu system, everything was going fine until the very last moment when I was met with a screen that said: ContextErrorException: Warning: date_default_timezone_get(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /var/www/symfony-test/app/cache/dev/classes.php line 5107 in /var/www/symfony-test/app/cache/dev/classes.php line 5107 at ErrorHandler->handle('2', 'date_default_timezone_get(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone.', '/var/www/symfony-test/app/cache/dev/classes.php', '5107', array('level' => '100', 'message' => 'Notified event "kernel.exception" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelException".', 'context' => array())) at date_default_timezone_get() in /var/www/symfony-test/app/cache/dev/classes.php line 5107 at Logger->addRecord('100', 'Notified event "kernel.exception" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelException".', array()) in /var/www/symfony-test/app/cache/dev/classes.php line 5193 at Logger->debug('Notified event "kernel.exception" to listener "Symfony\Component\HttpKernel\EventListener\ProfilerListener::onKernelException".') in /var/www/symfony-test/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php line 246 at TraceableEventDispatcher->preListenerCall('kernel.exception', array(object(ProfilerListener), 'onKernelException')) in /var/www/symfony-test/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php line 448 at TraceableEventDispatcher->Symfony\Component\HttpKernel\Debug\{closure}(object(GetResponseForExceptionEvent)) at call_user_func(object(Closure), object(GetResponseForExceptionEvent)) in /var/www/symfony-test/app/cache/dev/classes.php line 1667 at EventDispatcher->doDispatch(array(object(Closure), object(Closure)), 'kernel.exception', object(GetResponseForExceptionEvent)) in /var/www/symfony-test/app/cache/dev/classes.php line 1600 at EventDispatcher->dispatch('kernel.exception', object(GetResponseForExceptionEvent)) in /var/www/symfony-test/app/cache/dev/classes.php line 1764 at ContainerAwareEventDispatcher->dispatch('kernel.exception', object(GetResponseForExceptionEvent)) in /var/www/symfony-test/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php line 139 at TraceableEventDispatcher->dispatch('kernel.exception', object(GetResponseForExceptionEvent)) in /var/www/symfony-test/app/bootstrap.php.cache line 2870 at HttpKernel->handleException(object(ContextErrorException), object(Request), '1') in /var/www/symfony-test/app/bootstrap.php.cache line 2823 at HttpKernel->handle(object(Request), '1', true) in /var/www/symfony-test/app/bootstrap.php.cache line 2947 at ContainerAwareHttpKernel->handle(object(Request), '1', true) in /var/www/symfony-test/app/bootstrap.php.cache line 2249 at Kernel->handle(object(Request)) in /var/www/symfony-test/web/app_dev.php line 28 After many hours of trying ideas in other threads, editing php.ini and classes.php to something that might work, I have gotten absolutely nowhere! Has anyone else had this problem

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