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• How to run batched WCF service calls in Silverlight BackgroundWorker

  - by Simon

  Is there any existing plumbing to run WCF calls in batches in a BackgroundWorker? Obviously since all Silverlight WCF calls are async - if I run them all in a backgroundworker they will all return instantly. I just don't want to implement a nasty hack if theres a nice way to run service calls and collect the results. Doesnt matter what order they are done in All operations are independent I'd like to have no more than 5 items running at once Edit: i've also noticed (when using Fiddler) that no more than about 7 calls are able to be sent at any one time. Even when running out-of-browser this limit applies. Is this due to my default browser settings - or configurable also. obviously its a poor man's solution (and not suitable for what i want) but something I'll probably need to take account of to make sure the rest of my app remains responsive if i'm running this as a background task and don't want it using up all my connections.

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• Do MSDTC and disaster recovery go together?

  - by DevDelivery

  Our application writes to multiple Sql Server databases within a distributed transaction. The Ops guys are saying that this messes up their disaster recovery plan because while the transactions on the live tables may commit at the same time, the log shipping on the separate databases happen at slightly different times. So in in a disaster recovery situation, there will be a few partial transactions. Is there a method for maintaining separate but synced databases in DR? Or do we have to re-design to relatively independent databases (or a single database)?

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• Metalanguage like BNF or XML-Schema to validate a tree-instance against a tree-model

  - by Stefan

  Hi! I'm implementing a new machine learning algorithm in Java that extracts a prototype datastructure from a set of structured datasets (tree-structure). As im developing a generic library for that purpose, i kept my design independent from concrete data-representations like XML. My problem now is that I need a way to define a data model, which is basically a ruleset describing valid trees, against which a set of trees is being matched. I thought of using BNF or a similar dialect. Basically I need a way to iterate through the space of all valid TreeNodes defined by the ModelTree (Like a search through the search space for algorithms like A*) so that i can compare my set of concrete trees with the model. I know that I'll have to deal with infinite spaces there but first things first. I know, it's rather tricky (and my sentences are pretty bumpy) but I would appreciate any clues. Thanks in advance, Stefan

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• Parametrized Strategy Pattern

  - by ott

  I have several Java classes which implement the strategy pattern. Each class has variable number parameters of different types: interface Strategy { public data execute(data); } class StrategyA implements Strategy { public data execute(data); } class StrategyB implements Strategy { public StrategyB(int paramA, int paramB); public data execute(data); } class StrategyB implements Strategy { public StrategyB(int paramA, String paramB, double paramC); public data execute(data); } Now I want that the user can enter the parameters in some kind of UI. The UI should be chosen at runtime, i.e. the strategies should be independent of it. The parameter dialog should not be monolithic and there should be the possibility to make it behave and look different for each strategy and UI (e.g. console or Swing). How would you solve this problem?

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• Database per application VS One big database for all applications

  - by Jorge Vargas

  Hello, I'm designing a few applications that will share 2 or 3 database tables and all of the other tables will be independent of each app. The shared databases contain mostly user information, and there might occur the case where other tables need to be shared, but that's my instinct speaking. I'm leaning over the one database for all applications solution because I want to have referential integrity, and I won't have to keep the same information up to date in each of the databases, but I'm probably going to end with a database of 100+ tables where only groups of ten tables will have related information. The database per application approach helps me keep everything more organized, but I don't know a way to keep the related tables in all databases up to date. So, the basic question is: which of both approaches do you recommend? Thanks, Jorge Vargas.

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• teaching my self Z/OS assembler?

  - by Jared

  'I've interned at a company that does a lot of mainframe work. Most of my mainframe experience has been using Java and Unix System Services. I've had some experience with the ISPF interface and C but none with assembler. I’m graduating shortly and will be taking an independent study my last semester. I’d like to stick with the mainframe and was wondering what resources could teach me mainframe assembler? Note I don’t have experience writing assembler for any platform but do understand binary, hex, and have a theoretical understanding of registers.

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• How to start develop for chinese mobile phones based on nucleus RTOS? (MTK)

  - by juckobee

  I've noticed that chinese mobile phones became very popular, perhaps because of their very reasonable price and many modern features (touch screens, advanced multimedia, double sim cards etc). I'm wondering if there's any way to develop custom solutions for this handsets as independent developer? How to obtain a toolkit and documentation? I've found some resources, but mainly inconsistent tech notes, often in chinese only. For now I know, that majority of chinese handsets are based on chips from MediaTek (MTK), with operating system based on Nucleus RTOS and MMI (plutoMMI?) framework. Unfortunately, there is no Java RE avaiable (ok, there are some handsets with Java, however, Java isn't something I'm looking for) Is there any SDK, documentation, emulators/simulators, how-tos, etc avaiable? How to develop, deploy and test custom application for MTK mobile?

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• Unique identifier for an email

  - by Skywalker

  I am writing a C# application which allows users to store emails in a MS SQL Server database. Many times, multiple users will be copied on an email from a customer. If they all try to add the same email to the database, I want to make sure that the email is only added once. MD5 springs to mind as a way to do this. I don't need to worry about malicious tampering, only to make sure that the same email will map to the same hash and that no two emails with different content will map to the same hash. My question really boils down to how one would combine multiple fields into one MD5 (or other) hash value. Some of these fields will have a single value per email (e.g. subject, body, sender email address) while others will have multiple values (varying numbers of attachments, recipients). I want to develop a way of uniquely identifying an email that will be platform and language independent (not based on serialization). Any advice?

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• WPF command/click argument

  - by Joel Barsotti

  So I have a background in ASP.NET where a button could have a click handler or a command handler and then a command argument. That pattern was great for when you had a bunch of buttons that basically needed to execute the same block of code with only a slightly different argument. Is there a collary in WPF? From what I've seen of the Command in WPF is that it revolves around an action that is independent of the control that invokes it (and still doesn't provide a way to provide an argument). Which is not really what I need.

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• How to organize a large number of objects

  - by shane

  We have a large number of documents and metadata (xml files) associated with these documents. What is the best way to organize them? Currently we put them into a series of nested folders: /repository/category/date(when they were loaded into our db)/document_number.pdf and .xml We use the path as a unique identifier for the document in our system. This is more versatile than putting them all in a single flat folder. also it is independent from our database/application, so we can reload them in case of failure. Yet, it introduces some limitations. for example we can't move the files once they've been placed in this structure, also it takes work to put them this way. What is the best practice? How websites such as Scribd deal with this problem?

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• A PHP design pattern for the model part [PHP Zend Framework]

  - by Matthieu

  I have a PHP MVC application using Zend Framework. As presented in the quickstart, I use 3 layers for the model part : Model (business logic) Data mapper Table data gateway (or data access object, i.e. one class per SQL table) The model is UML designed and totally independent of the DB. My problem is : I can't have multiple instances of the same "instance/record". For example : if I get, for example, the user "Chuck Norris" with id=5, this will create a new model instance wich members will be filled by the data mapper (the data mapper query the table data gateway that query the DB). Then, if I change the name to "Duck Norras", don't save it in DB right away, and re-load the same user in another variable, I have "synchronisation" problems... (different instances for the same "record") Right now, I use the Multiton pattern : like Singleton, but multiple instances indexed by a key (wich is the user ID in our example). But this is complicating my developpement a lot, and my testings too. How to do it right ?

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• Entity Framework + SQLite deployment

  - by Pompair

  Hi, I have a ASP.NET MVC app that is using SQLite database through Entity Framework. Everything works on VS 2008's local development webserver. However, deploying the web app to my service provider causes this error: [ArgumentException: Unable to find the requested .Net Framework Data Provider. It may not be installed.] System.Data.Common.DbProviderFactories.GetFactory(String providerInvariantName) +1308959 System.Data.EntityClient.EntityConnection.GetFactory(String providerString) +35 Service provider has commented that they do not support SQLite. I had though that SQLite is independent of service provider's settings since it's App_Data deployable. Has anyone experiences of a succesfull Entity Framework + SQLite deployment? Cheers, -pom-

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• C# Improvement on a Fire-and-Forget

  - by adam

  Greetings I have a program that creates multiples instances of a class, runs the same long-running Update method on all instances and waits for completion. I'm following Kev's approach from this question of adding the Update to ThreadPool.QueueUserWorkItem. In the main prog., I'm sleeping for a few minutes and checking a Boolean in the last child to see if done while(!child[child.Length-1].isFinished){ Thread.Sleep(...); } This solution is working the way I want, but is there a better way to do this? Both for the independent instances and checking if all work is done. Thanks

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• Can someone recommend a bells and whistles CSS framework?

  - by Ali A

  I am looking for a bells and whistles CSS framework. I have found a number online that deal with "grids", and some that deal with "typography" and others that deal with "resetting". What I have not found is something that will give my web applications a consistent reusable style or theme. I guess it would have to have a number of predefined elements that do things, for example: div.boxed {...} And then a number of themes or plugins that provide these in a consistent way. Javascript toolkits like ExtJS, YUI, and also GWT have their own skinability, and I guess this is the featureset that I want, but independent of any Javascript library. (Open source would be best, but we don't mind paying) Edit: 5 good answers, but I have seen all those frameworks, and they are not enough of what I am looking for. Perhaps what I am looking for doesn't exist. Or I haven't explained properly. I will give them a good going over and see.

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• PHP Explode with an Unicode character as separator

  - by Young Roger

  XPDFs pdftotext converts pdf to text and outputs it at command line level. If needed it inserts PageBreaks between the pages as specified in TextOutputDev.cc: eopLen = uMap->mapUnicode(0x0c, eop, sizeof(eop)); This Unicode symbol is encoding independent, -enc ASCII7 wouldn't change it. I'm currently willing to use PHP for converting and splitting the PDF file into several TXT pages for database storage. However, the following function does work, but takes twice as long as a conversion of the whole book in one time. for($i = 1; $i <= $pages[0]; $i++) $page[$i] = shell_exec('/usr/bin/pdftotext sample.pdf -f '.$i.' -l '.$i.' -'); How am I supposed to explode(0x0c, $wholePDF) with an Unicode character as separator? Currently, page[$i] doesn't seem to retrieve those weird Unicode PageBreak characters from the shell_exec(). I tried several headers for encoding (UTF-8 especially) but it didn't work out so far.

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• How to manage test fixtures for end-to-end testing?

  - by Peter Becker

  Having just set up a test framework for a new web application, I realized I missed one of the big questions: "How do I make tests independent from each other?" Years ago I have set up some complicated Ant scripting to do full cycles of deleting all database tables, creating the schema again, adding test data, starting the application, running one test and then stopping the application. That was a pain to maintain and restricted us to nightly tests due to the time it took to run the full suite. It was still worth it, but I wonder if there is an easier way. Are there alternatives to this approach? The main criterion is that each test should not be affected by any other test in the suite, no matter if it failed or succeeded.

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• What kind of window can be docked in Win7?

  - by CuiPengFei

  I have been developing a toy editor, and I want my editor to look like the VS2010 text editor which can be dragged out of the main window to become a independent window and the dragged-out window can be maximized when it's dragged to the top of the screen, and can be docked by being dragged to the left or right side of the screen(which is a new feature in Win7). So I tried to use AvalonDock(a codeplex project) to do that.But I found the dragged-out DocumentContent(a class in AvalonDock,it inherits from ContentControl) is not treated like a real window in Win7. So I wanna know that What kind of window can be docked by being dragged to the left/right side or the top of the screen in Win7? Thanks!!

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• Is there a way to export an XSD schema from a DataContract

  - by Eric

  I'm using DataContractSerializer to serialize/deserialize my classes to/from XML. Everything works fine, but at some point I'd like to establish a standard schema for the format of these XML files independent of the actual code. That way if something breaks in the serialization process I can always go back and check what the standard schema should be. Or if I do need to modify the schema the modification is an explicit decision rather then just a later affect of modifying my code. In addition, other people may be writing other software that may not be .NET based that would need to read from these XML files. I'd like to be able to provide them with some kind of documentation of the schema. Is there some relationship between a DataContract and an XSD schema. Is there a way to export the DataContract attributes in classes as an XSD schema?

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• Visual Studio 2010 automation

  - by JoelFan

  I am trying to run the following code (which I got from here ) Public Sub WriteToMyNewPane() Dim win As Window = _ DTE.Windows.Item(EnvDTE.Constants.vsWindowKindOutput) Dim ow As OutputWindow = win.Object Dim owPane As OutputWindowPane Dim cnt As Integer = ow.OutputWindowPanes.Count owPane = ow.OutputWindowPanes.Add("My New Output Pane") owPane.Activate() owPane.OutputString("My text1" & vbCrLf) owPane.OutputString("My text2" & vbCrLf) owPane.OutputString("My text3" & vbCrLf) End Sub Instead of running it as a Macro, I want to run it as an independent console application that connects to a currently running instance of Visual Studio 2010. I'm having a hard time figuring out how to set the value of DTE. I think I may need to call GetActiveObject, but I'm not sure how. Any pointers?

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• PhysX for massive performance via GPU ?

  - by devdude

  I recently compared some of the physics engine out there for simulation and game development. Some are free, some are opensource, some are commercial (1 is even very commercial $$$$). Havok, Ode, Newton (aka oxNewton), Bullet, PhysX and "raw" build-in physics in some 3D engines. At some stage I came to conclusion or question: Why should I use anything but NVidia PhysX if I can make use of its amazing performance (if I need it) due to GPU processing ? With future NVidia cards I can expect further improvement independent of the regular CPU generation steps. The SDK is free and it is available for Linux as well. Of course it is a bit of vendor lock-in and it is not opensource. Whats your view or experience ? If you would start right now with development, would you agree with the above ? cheers

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• Rails Foreign key setup question.

  - by James P. Wright

  I'm just (re)starting playing around with Rails and I'm making a little card game app. I cannot seem to figure out my Foreign Key setups. Say I have 4 objects: - Game - Player - Hand - Card A Game has many Players, which have many Hands which have many Cards. But the cards are also independent of a Hand, Player and Game. For example, I have 6 Cards in my database (1 to 6). It is possible that Card 3 could be in 2 Players Hands in the same Game. How can I set up my keys for this? Should I just create another object for "CardInHand" to simplify it?

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• Why is the JVM stack-based and the DalvikVM register based?

  - by aioobe

  I'm curious, why did Sun decide to make the JVM stack-based and Google decide to make the DalvikVM register based? I suppose the JVM can't really assume that a certain number of registers are available on the target platform, since it is supposed to be platform independent. Therefor it just postpones the register-allocation etc, to the JIT compiler. (Correct me if I'm wrong.) So the Android guys thought, "hey, that's inefficient, let's go for a register based vm right away..."? But wait, there are multiple different android devices, what number of registers did the Dalvik target? Are the Dalvik opcodes hardcoded for a certain number of registers? Do all current Android devices on the market have about the same number of registers? Or, is there a register re-allocation performed during dex-loading? How does all this fit together?

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• SMO missing dll on a clients

  - by Dale

  I've created an app that connects remotely to SQL Server 2008. SQL connections work and all traditional oCommand.ExecuteNonQuery(), work great! But my SMO class using server.ConnectionContext.ExecuteNonQuery(scriptfile); ERROR: missing batch parsing.dll . I can't install these independent utils on a client machines, and then take them all off when done: as suggested by: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=228de03f-3b5a-428a-923f-58a033d316e1 Since my bulk-inserts are large memory hogs containing complete tables, I wrote the tables to a temptable.sql files and used SQLCMD Util and later switch too SMO and I have the same problem. Neither of these can be leveraged on the client's PCs . Any suggestion? thanks :-)

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• Which language/framework to use for this desktop internet application?

  - by Karsten

  I'd like to experiment with a new language/framework to work on some desktop tools for myself, which will do tasks related to internet services. I.e. i'd like to to monitor some of my servers for http or icmp response, also parse xml responses. I have experience with php, lua, mysql, and basic knowledge of java and c++. I'm also interested in exploring multithreading for this, background tasks and a responsive gui do need that as i have read. Being a private project, i certainly want to learn something new, but i don't have that much free time. The question for you would be which language and what framework to choose that could help me with this tasks: lightweight + fast gui (windows only would be ok, platform-independent even better) network/socket support, html module would be appreciated htmlview support xml "parsing" support (xpath or something like the phpish DOMDocument class) threading support Free software would be nice, but paying some bucks won't hurt me if it really helps the case.

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• JPA @TableGenerator shared between multiple entities

  - by Mauricio

  Hi Guys, I have a 'dog' Entitiy with an @Id and a @TableGenerator ... @TableGenerator(table = "seq", name = "dog_gen", pkColumnName = "seq_name", valueColumnName="seq_val") @Id @GeneratedValue(strategy = GenerationType.TABLE, generator = "dog_gen") private Long id; ... Is there a way to reuse the same table generator (dog_gen) in other entity? I want to keep the same id sequence in two independent Entities, say dog=1, dog=2, dog=3, cat=4, cat=5, dog=6 and so on... Both entities don't share a common superclass to implement some kind of inheritance with the id property. If I add the @GeneratedValue( generator="dog_gen") on my cat entity, omitting the @TableGenerator declaration throws an Exception saying it can't find the generator when starting the context. Caused by: org.hibernate.AnnotationException: Unknown Id.generator: dog_gen at org.hibernate.cfg.BinderHelper.makeIdGenerator(BinderHelper.java:413) at org.hibernate.cfg.AnnotationBinder.bindId(AnnotationBinder.java:1795) at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1229) at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:733) at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:498) at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:277)

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