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  • java System.nanoTime is really slow. Is it possible to implement a high performance java profiler?

    - by willpowerforever
    I did a test and found the overhead of a function call to System.nanoTime() is at least 500 ns on my machine. Seemed that it is very hard to have a high performance java profiler. For enterprise software, suppose a function takes about 350 seconds and has 12,500,000,000 times of method calls. Therefore, the number of calls to System.nanoTime() is: 12,500,000,000 * 2 = 25,000,000,000 (one for start timestamp, one for end timestamp) And the overhead of System.nanoTime in total is: 500 ns * 25,000,000,000 = 500 * 25000 s = 12500000s. Note: all data from real case. Any better way to acquire the timestamp?

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  • What is an effective way to convert a shared memory-mapped system to another data access model?

    - by Rob Jones
    I have a code base that is designed around shared memory. Each process that needs to access the memory maps it into its own address space. The data structures in the shared memory are directly accessed, that is, there is no API. For example: Assume the following: typedef struct { int x; int y; struct { int a; int b; } z; } myStruct; myStruct s; Then a process might access this structure as: myStruct *s = mapGlobalMem(); And use it as: int tmpX = s->x; The majority of the information in the global structure is configuration information that is set once and read many times. I would like to store this information in a database and develop an API to access the database. The problem is, these references are sprinkled throughout the code. I need a way to parse the code and identify global structure references that will need to be refactored. I've looked into using ANTLR to create a parser that will identify references to a small set of structures and enter them into a custom symbol table. I could then use this symbol table to identify which source files need to be refactored. It looks like a promising approach. What other approaches are there? Of course, I'm looking for a programmatic approach. There are far too many source files to examine each one visually. This is all ordinary ANSI C. Nothing else.

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  • EntLib 5 install gets error “The system administrator has set policies to prevent this installation.

    - by Stan Spotts
    I got this when I tried to install the source code on Windows Server 2008 R2, and this was an issue with EntLib 4.0 as well. The solution is the same now as it was then, but since I had a new OS install I didn't recreate the fix. I had to add a registry key: DisableMSI REG_DWORD value 0 It goes here: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Installer The description for this key is here: http://msdn.microsoft.com/en-us/library/aa368304(VS.85).aspx

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  • Should components have sub-components in a component-based system like Artemis?

    - by Daniel Ingraham
    I am designing a game using Artemis, although this is more of philosophical question about component-based design in general. Let's say I have non-primitive data which applies to a given component (a Component "animal" may have qualities such as "teeth" or "diet"). There are three ways to approach this in data-driven design, as I see it: 1) Generate classes for these qualities using "traditional" OOP. I imagine this has negative implications for performance, as systems then must be made aware of these qualities in order to process them. It also seems counter to the overall philosophy of data-driven design. 2) Include these qualities as sub-components. This seems off, in that we are now confusing the role of components with that of entities. Moreover out of the box Artemis isn't capable of mapping these subcomponents onto their parent components. 3) Add "teeth", "diet", etc. as components to the overall entity alongside "animal". While this feels odd hierarchically, it may simply be a peculiarity of component-based systems. I suspect 3 is the correct way to think about things, but I was curious about other ideas.

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  • How can Agile methodologies be adapted to High Volume processing system development?

    - by luckyluke
    I am developing high volume processing systems. Like mathematical models that calculate various parameters based on millions of records, calculated derived fields over milions of records, process huge files having transactions etc... I am well aware of unit testing methodologies and if my code is in C# I have no problem in unit testing it. Problem is I often have code in T-SQL, C# code that is a SQL stored assembly, and SSIS workflow with a good amount of logic (and outcomes etc) or some SAS process. What is the approach YOu use when developing such systems. I usually develop several tests as Stored procedures in a designed schema(TEST) and then automatically run them overnight and check out the results. But this is only for T-SQL. And Continous integration IS hard. But the problem is with testing SSIS packages. How do You test it? What is Your preferred approach for stubbing data into tables (especially if You need a lot data initialization). I have some approach derived over the years but maybe I am just not reading enough articles. So Banking, Telecom, Risk developers out there. How do You test your mission critical apps that process milions of records at end day, month end etc? What frameworks do You use? How do You validate that Your ssis package is Correct (as You develop it)/ How do You achieve continous integration in such an environment (Personally I never got there)? I hope this is not to open-ended question. How do You test Your map-reduce jobs for example (i do not use hadoop but this is quite similar). luke Hope that this is not too open ended

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  • Reach More Customers - Partner Event Publishing System Now Available!

    - by swalker
    The Partner Event Publishing Service is now available to partners that have completed at least one Specialization. If you are an active Gold, Platinum or Diamond OPN member having accomplished at least one Specialization then you can start publishing your standalone live events today, including both in-person and webinar activities. Events are published on both Oracle.com/events and on Oracle’s internal calendar. You benefit by reaching new potential customers and creating more brand awareness.  Reach more customers by publishing Partner led events on Oracle.com/events by filling out a simple spreadsheet and submitting them to [email protected]. Click here for more information, and click here to download the Partner Event Publishing Form spreadsheet.

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  • Weird system freeze. Nothing works keyboard/mouse/reset button - Ubuntu 12.04 64bits [closed]

    - by Simon
    I have fresh PC: i5 3570K with Intel 4000 onboard ASrock Z77 Extreme4-m 8GG RAM - Adata 1333Mhz... 1TB Seagate drive 7200rpm I've also fresh systems - Ubuntu/Win7 and today there was something strange. Ubuntu twice just freezed. Everything stopped, even keyboard and mouse wasn't responding. Even RESET button didn't work. Right now memtest is running, but I'd like to know, where else can i look for cause. Can it be software fault if even reset isn't working? Only long reset pressing rebooted PC... I'm a bit confused. Or should I test components - CPU, motherboard, disk. Which logs in Ubuntu should I check to diagnose cause? EHm I had few adventures with this PC already. Shipped motherboard was broken (ASrock Z68 Extreme3) and had old bios, so I had to contact with reseller, replace it and at the end decided on Z77, but everything took 3 weeks, so I have bad feelings... Edit: Both freezes were during editing something in gedit (it can be coincidence) and after few updates today - when memtest is end I'll check what was updated

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  • 'Step Into' is suddenly not working in Visual Studio

    - by Nick LaMarca
    All of a sudden, I have run into an issue where I cannot step into any code through debugging in Visual Studio. The step over works fine, but it refuses to step into (F11) any of my code. This was working before, now all of a sudden it does not. I've tried some things below, but I still had no success: Delete all bin files in every project in my solution, clean solution, re-build solution. Build projects in solution indivdualy Restart machine It an ASP.NET C# application consuming a WCF sevice locally. It is in debug mode. I have a breakpoint set on the page consuming the service. The breakpoint hits, but it will not step into the service code. The ASP.NET site and the service code is all in the same solution. This all of a sudden does not work, it did work before. How can I fix this problem? Adding a breakpoint to the service project I get a warning: Breakpoint will not currently be hit. No symbols have been loaded for this document. I deleted all the bin folders for all the projects and re-built them one by one. They all succeeded, but still I am getting the symbols won't load on any breakpoint I put into any project in the solution other than the ASP.NET project where the breakpoint works. I was able to debug step into all the projects before, this is an all of a sudden thing. Information from the output window.. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\SMDiagnostics\v4.0_4.0.0.0__b77a5c561934e089\SMDiagnostics.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.DurableInstancing\v4.0_4.0.0.0__31bf3856ad364e35\System.Runtime.DurableInstancing.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.Xaml.Hosting\v4.0_4.0.0.0__31bf3856ad364e35\System.Xaml.Hosting.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\2d49cf50\14eee2cf\App_Web_jmow15fw.dll', Symbols loaded. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.Serialization\v4.0_4.0.0.0__b77a5c561934e089\System.Runtime.Serialization.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.WorkflowServices\v4.0_4.0.0.0__31bf3856ad364e35\System.WorkflowServices.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Web\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Web.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Discovery\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Discovery.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Activities\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Activities.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Routing\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Routing.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Channels\v4.0_4.0.0.0__31bf3856ad364e35\System.ServiceModel.Channels.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'WebDev.WebServer40.EXE' (Managed (v4.0.30319)): Loaded 'C:\windows\Microsoft.Net\assembly\GAC_MSIL\System.IdentityModel\v4.0_4.0.0.0__b77a5c561934e089\System.IdentityModel.dll', Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.

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  • Problem with continue in While Loop within Try/Catch in C# (2.0)

    - by csharpnoob
    Hi, when i try to use in my ASPX Webpage in the Code Behind this try{ while() { ... db.Open(); readDataMoney = new OleDbCommand("SELECT * FROM Customer WHERE card = '" + customer.card + "';", db).ExecuteReader(); while (readDataMoney.Read()) { try { if (!readDataMoney.IsDBNull(readDataMoney.GetOrdinal("Credit"))) { customer.credit = Convert.ToDouble(readDataMoney[readDataMoney.GetOrdinal("Credit")]); } if (!readDataMoney.IsDBNull(readDataMoney.GetOrdinal("Bonus"))) { customer.bonus = Convert.ToDouble(readDataMoney[readDataMoney.GetOrdinal("Bonus")]); } } catch (Exception ex) { Connector.writeLog("Money: " + ex.StackTrace + "" + ex.Message + "" + ex.Source); customer.credit = 0.0; customer.credit = 0.0; continue; } finally { } } readDataMoney.Close(); vsiDB.Close(); ... } }catch { continue; } The whole page hangs if there is a problem when the read from db isn't working. I tried to check for !isNull, but same problem. I have a lots of differend MDB Files to process, which are readonly (can't repair/compact) and some or others not. Same Design/Layout of Tables. With good old ASP Classic 3.0 all of them are processing with the "On Resume Next". I know I know. But that's how it is. Can't change the source. So the basic question: So is there any way to tell .NET to continue the loop whatever happens within the try loop if there is any exception? After a lots of wating time i get this exceptions: at System.Data.Common.UnsafeNativeMethods.IDBInitializeInitialize.Invoke(IntPtr pThis) at System.Data.OleDb.DataSourceWrapper.InitializeAndCreateSession(OleDbConnectionString constr, SessionWrapper& sessionWrapper) at System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection) at System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.OleDb.OleDbConnection.Open() at GetCustomer(String card)Thread was being aborted.System.Data and System.Runtime.InteropServices.Marshal.ReadInt16(IntPtr ptr, Int32 ofs) System.Data.ProviderBase.DbBuffer.ReadInt16(Int32 offset) System.Data.OleDb.ColumnBinding.Value_I2() System.Data.OleDb.ColumnBinding.Value() System.Data.OleDb.OleDbDataReader.GetValue(Int32 ordinal) System.Data.OleDb.OleDbDataReader.get_Item(Int32 index) Thread was terminated.mscorlib Thanks for any help.

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  • What is the value of an Enterprise Resource Planning (ERP) System?

    According to PWC.com ERP systems can add tremendous value to a company’s core business functionality.  Below PWC.com summarizes the primary value that an ERP can add to a company. ERPs are a collection business application that coordinates the resources, information, and activities required for core business processes. ERPs are strategic tools used to reduce costs, improve business processes, and healthier risk management.

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  • How to load Image in C# and set properties of the Picture Box

    - by SAMIR BHOGAYTA
    Create a C# application drag a picture Box, four buttons and open file dialog on the form. Write code on btn_browse Button click ----------------------------------------- private void btn_browse_Click(object sender, System.EventArgs e) { try { OpenFileDialog open = new OpenFileDialog(); open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp"; if (open.ShowDialog()==DialogResult.OK) { pictureBox1.Image = new Bitmap(open.FileName); } } catch (Exception) { throw new ApplicationException("Failed loading image"); } } Write code on btn_StretchImage Button click ------------------------------------------------ private void btn_StretchImage_Click(object sender, System.EventArgs e) { pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage; } Write code on btn_AutoSize Button click ------------------------------------------------- private void btn_AutoSize_Click(object sender, System.EventArgs e) { pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize; } Write code on btn_CenterImage Button click -------------------------------------------------- private void btn_CenterImage_Click(object sender, System.EventArgs e) { pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.CenterImage; }

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  • Why can Perforce be a better version control system? [closed]

    - by dukeofgaming
    I've seen some people love and some loathe Perforce. As users or administrators with experience with other version control systems (free cookie to the ones with DVCS experience [git, Mercurial]), what is the main reason/feature that makes you love Perforce over other version control systems? Edit: No, I don't sell Perforce... this is just part of my ongoing research to pitch DVCS at my company (see my question history)

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  • Linux is not an operating system, or is it?

    <b>Technology & Life Integration:</b> "There is a word in the English language (which I hope I am using) called context. In other words, I use the word Linux in the context of a complete Linux based distribution and believe that my readers understand that context."

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  • Where does the YouTube video files stored on system nowadays?

    - by souravc
    When I open a youtube video with firefox I could not find any video file inside ~/.mozilla/firefox/<some_string>.default/Cache/. I also tried with google-chrome like, ps ax | grep flash ls -l /proc/[*PID*]/fd | grep Flash But again /proc/[*PID*]/fd does not have any video like file. ls -l /proc/[*PID*]/fd have some results like lrwx------ 1 root root 64 Nov 9 12:18 22 -> /run/shm/.com.google.Chrome.eOsHNu (deleted) lrwx------ 1 root root 64 Nov 9 12:18 23 -> /run/shm/.com.google.Chrome.p8h6BL (deleted) Result of ls -l /proc/[*PID*]/fd | grep Flash for some videos from other site is like lrwx------ 1 root root 64 Nov 9 12:35 26 -> /home/username/.config/google-chrome/Default/Pepper Data/Shockwave Flash/.com.google.Chrome.QMzxP8 (deleted) But could not be copied. Then what are the places where firefox or google-chrome stores the streaming videos? And is it possible to recover(copy) a video from there to watch them offline? P.S I have other ways(downloaders) to have streaming videos, but my question is very specific.

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  • Does my approach for building a real time monitoring system make sense? [closed]

    - by sameer
    I am developing an application that will display a dashboard that will display data from different SQL databases. This needs to happen in almost real time, our refresh time is about 5 minutes. My approach so far is: Develop a Windows service to accumulate the data from various SQL Server instances. Persist those details into a SQL DB, from which the dashboard will display them on the web page. Trigger fetching of data from the Windows service will every x minutes. The details of the SQL Server instances will be stored in the SQL DB which the Windows service will be referring. Does my approach make sense?

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  • How should I structure moving from overworld to menu system / combat?

    - by persepolis
    I'm making a text-based "Arena" game where the player is the owner of 5 creatures that battle other teams for loot, experience and glory. The game is very simple, using Python and a curses emulator. I have a static ASCII map of an "overworld" of sorts. My character, represented by a glyph, can move about this static map. There are locations all over the map that the character can visit, that break down into two types: 1) Towns, which are a series of menus that will allow the player to buy equipment for his team, hire new recruits or do other things. 2) Arenas, where the player's team will have a "battle" interface with actions he can perform, messages about the fight, etc. Maybe later, an ASCII representation of the fight but for now, just screens of information with action prompts. My main problem is what kind of design or structure I should use to implement this? Right now, the game goes through a master loop which waits for keyboard input and then moves the player about the screen. My current thinking is this: 1) Upon keyboard input, the Player coordinates are checked against a list of Location objects and if the Player coords match the Location coords then... 2) ??? I'm not sure if I should then call a seperate function to initiate a "menu" or "combat" mode. Or should I create some kind of new GameMode object that contains a method itself for drawing the screen, printing the necessary info? How do I pass my player's team data into this object? My main concern is passing around the program flow into all these objects. Should I be calling straight functions for different parts of my game, and objects to represent "things" within my game? I was reading about the MVC pattern and how this kind of problem might benefit - decouple the GUI from the game logic and user input but I have no idea how this applies to my game.

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  • Does it make sense to implement OAuth for a 2 party system?

    - by nbv4
    I'm under the impression that OAuth is for authentication between three parties. Does it make sense to implement OAuth in a context where there is just a client and server. We have a server, and a client (HTML/javascript). Currently we authenticate via the normal "post credentials to server, get a cookie, use cookie to authenticate all subsequent requests" method. Will implementing OAuth be a benefit in this situation?

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  • Java: How to test methods that call System.exit()?

    - by Chris Conway
    I've got a few methods that should call System.exit() on certain inputs. Unfortunately, testing these cases causes JUnit to terminate! Putting the method calls in a new Thread doesn't seem to help, since System.exit() terminates the JVM, not just the current thread. Are there any common patterns for dealing with this? For example, can I subsitute a stub for System.exit()? [EDIT] The class in question is actually a command-line tool which I'm attempting to test inside JUnit. Maybe JUnit is simply not the right tool for the job? Suggestions for complementary regression testing tools are welcome (preferably something that integrates well with JUnit and EclEmma).

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  • Ubuntu Variant / Linux Distros which uses least system resources (RAM, CPU)?

    - by elegantonyx
    I have a netbook (an older Asus EEEPC 1005HA) which I want to get rid of Windoze on (I like Windows, but I don't think it works well in a netbook environment). Basically, my question is which Ubuntu variant will use the least RAM and CPU running idle, and/or the same question except when running Firefox and Libreoffice Writer, say. I am also open to suggestions of non-Ubuntu Linux distros, but since this is AskUbuntu I thought the first question would be more appropriate. I have a disk drive which I can attach to the netbook, so it doesn't have to be a Ubuntu Variant / Linux Distro which solely boots from a USB drive. I have at my disposal: DVDs, DVD writer/ disk drive, 4gb flash drive, 8 gb flash drive I was thinking either Lubuntu or Archbang / Crunchbang but I would like some help from more knowledgable people Specs: Can't boot into it right now, but I think I have either Intel Atom N270 @1.60ghz OR Intel Atom N280 @1.66ghz (single core, I think) 2gb RAM 160 GB hard drive

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  • My Folders Become Hidden System Files And Access Denied?

    - by echolab
    I just aske a question in Superuser site , i have an external hdd which suddenly seems infected and one of my folders which contain my photos changed to something like this One of superuser guys suggest that i install an ubuntu and try to scan and change permissions , but i am not an ubuntu expert , and believe me if my problem solve i will switch to it ( cause all i do is writing and taking photos i am tired of malewares and etc ) Now i have ubuntu and fedora installed ( after a long read through guides ) , both of them show infected folder as empty ( in windows 7 i see this strange folders , you can see in picture )

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  • How can I push a string from one client connected to a WCF service to another connected as well?

    - by Sergio Tapia
    Here's what I have so far: IService: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ServiceModel; namespace ServiceLibrary { [ServiceContract(SessionMode = SessionMode.Allowed, CallbackContract = typeof(IServiceCallback))] public interface IService { [OperationContract(IsOneWay = false, IsInitiating = true, IsTerminating = false)] void Join(string userName); } interface IServiceCallback { [OperationContract(IsOneWay = true)] void UserJoined(string senderName); } } Service: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ServiceModel; namespace ServiceLibrary { [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Multiple)] public class Service:IService { IServiceCallback callback = null; public void Join(string userName) { callback = OperationContext.Current.GetCallbackChannel<IServiceCallback>(); } } } Just a simple string passed from one client to another.

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  • Recent 12.04 Upgrade Makes My System and Internet Run Extremely SLOW!

    - by Sterling
    I'm running a Dell Inspiron 1564 with Windows7/Ubuntu dual booting. I haven't logged into the Ubuntu OS partition for some time until recently (trying to force myself into a Linux environment to learn) and when I did, It asked me to upgrade to 12.04 and so I did, restarted and since, everything seems to run extremely slow (startup, opening applications, running applications, switching windows, etc., etc... Another thing is that the Internet cuts out intermittently on my browser. Some pages within my Firefox tabs I can access, some I cant. Almost always while running Skype or some other Internet using application. So I know that I'm getting Internet, I can chat with friends over Skype but certain pages wont load during my Skype calls; the pages just hang upon resfreshing... I can eventually get the page to load after an indefinite amount of waiting and refreshing but this is very annoying. I am extremely new to Linux so I apologize in advance for my absolute ignorance. I am willing to post whatever information you Linux gurus have me type into the terminal in hopes that you can help me =) Thanks in advance!

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  • Is it possible to use multiple desktop environments on same system?

    - by Kshitiz Sharma
    I am using Ubuntu 12.04. I want to try out KDE and other desktop environments. But I'm not sure if I'll like them enough to switch permanently. I want to be safe and make a transition in a piecemeal fashion. Is it possible to install KDE on Ubuntu and yet not do away with the default Unity shell? Could I install multiple desktop environments and switch between them by tweaking some startup configuration and then rebooting?

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  • what are the "Online accounts" used for under System Settings?

    - by user67811
    I previously never bothered with it. but I just did a fresh install of 12.04 and figured "hey maybe i'll put in my google account and see what happens" I logged in with google and everyting like mal/calendar/contacts/chat is set to "on"... I figured it might automatically set up my gmail for various applications like empathy and thunderbird.. but I opened them up and found nothing... What exactly is the purpose of adding your account to "online accounts"? where is it used?

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