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  • Using C# 4.0’s DynamicObject as a Stored Procedure Wrapper

    - by EltonStoneman
    [Source: http://geekswithblogs.net/EltonStoneman] Overview Ignoring the fashion, I still make a lot of use of DALs – typically when inheriting a codebase with an established database schema which is full of tried and trusted stored procedures. In the DAL a collection of base classes have all the scaffolding, so the usual pattern is to create a wrapper class for each stored procedure, giving typesafe access to parameter values and output. DAL calls then looks like instantiate wrapper-populate parameters-execute call:       using (var sp = new uspGetManagerEmployees())     {         sp.ManagerID = 16;         using (var reader = sp.Execute())         {             //map entities from the output         }     }   Or rolling it all into a fluent DAL call – which is nicer to read and implicitly disposes the resources:   This is fine, the wrapper classes are very simple to handwrite or generate. But as the codebase grows, you end up with a proliferation of very small wrapper classes: The wrappers don't add much other than encapsulating the stored procedure call and giving you typesafety for the parameters. With the dynamic extension in .NET 4.0 you have the option to build a single wrapper class, and get rid of the one-to-one stored procedure to wrapper class mapping. In the dynamic version, the call looks like this:       dynamic getUser = new DynamicSqlStoredProcedure("uspGetManagerEmployees", Database.AdventureWorks);     getUser.ManagerID = 16;       var employees = Fluently.Load<List<Employee>>()                             .With<EmployeeMap>()                             .From(getUser);   The important difference is that the ManagerId property doesn't exist in the DynamicSqlStoredProcedure class. Declaring the getUser object with the dynamic keyword allows you to dynamically add properties, and the DynamicSqlStoredProcedure class intercepts when properties are added and builds them as stored procedure parameters. When getUser.ManagerId = 16 is executed, the base class adds a parameter call (using the convention that parameter name is the property name prefixed by "@"), specifying the correct SQL Server data type (mapping it from the type of the value the property is set to), and setting the parameter value. Code Sample This is worked through in a sample project on github – Dynamic Stored Procedure Sample – which also includes a static version of the wrapper for comparison. (I'll upload this to the MSDN Code Gallery once my account has been resurrected). Points worth noting are: DynamicSP.Data – database-independent DAL that has all the data plumbing code. DynamicSP.Data.SqlServer – SQL Server DAL, thin layer on top of the generic DAL which adds SQL Server specific classes. Includes the DynamicSqlStoredProcedure base class. DynamicSqlStoredProcedure.TrySetMember. Invoked when a dynamic member is added. Assumes the property is a parameter named after the SP parameter name and infers the SqlDbType from the framework type. Adds a parameter to the internal stored procedure wrapper and sets its value. uspGetManagerEmployees – the static version of the wrapper. uspGetManagerEmployeesTest – test fixture which shows usage of the static and dynamic stored procedure wrappers. The sample uses stored procedures from the AdventureWorks database in the SQL Server 2008 Sample Databases. Discussion For this scenario, the dynamic option is very favourable. Assuming your DAL is itself wrapped by a higher layer, the stored procedure wrapper classes have very little reuse. Even if you're codegening the classes and test fixtures, it's still additional effort for very little value. The main consideration with dynamic classes is that the compiler ignores all the members you use, and evaluation only happens at runtime. In this case where scope is strictly limited that's not an issue – but you're relying on automated tests rather than the compiler to find errors, but that should just encourage better test coverage. Also you can codegen the dynamic calls at a higher level. Performance may be a consideration, as there is a first-time-use overhead when the dynamic members of an object are bound. For a single run, the dynamic wrapper took 0.2 seconds longer than the static wrapper. The framework does a good job of caching the effort though, so for 1,000 calls the dynamc version still only takes 0.2 seconds longer than the static: You don't get IntelliSense on dynamic objects, even for the declared members of the base class, and if you've been using class names as keys for configuration settings, you'll lose that option if you move to dynamics. The approach may make code more difficult to read, as you can't navigate through dynamic members, but you do still get full debugging support.     var employees = Fluently.Load<List<Employee>>()                             .With<EmployeeMap>()                             .From<uspGetManagerEmployees>                             (                                 i => i.ManagerID = 16,                                 x => x.Execute()                             );

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  • Asp.Net MVC does automatic model validation for DateTime but no others

    - by MattSlay
    I'm using MVC 2 with some Models from a LinqToSql project that I built. I see that when I post back to a Controller Action after editing a form that has a DateTime field from the Model, the MVC Html.ValidationMessageFor() helper will nicely display an error beside the Date text box. This seems to happen automatically when the you test ModelState.IsValid() in the Controller Action, as if the MVC model binding automatically knows that the DateTime field cannot be empty. My question is... I have some other string fields in these LinqToSql generated classes that are Not-Nullable (marked as Not Nullable in Sql Server which passes thourgh to the LinqToSql generated classes), so why doesn't Mr. MVC pick up on those as well and display a "Required" message in the ValidationMessageFor() placeholders I have added for those fields? Sure, I have successfully added the MetadataType(typeof) buddy classes to cover these Non-nullable string fields, but it sure does seem redundant to add all this metadata in buddy classes when the LinqToSql generated classes already contain enough info that MVC could sniff out. It MVC validation works with DateTime automatically, why not these Not-nullable fields too?

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  • College Courses through distance learning

    - by Matt
    I realize this isn't really a programming question, but didn't really know where to post this in the stackexchange and because I am a computer science major i thought id ask here. This is pretty unique to the programmer community since my degree is about 95% programming. I have 1 semester left, but i work full time. I would like to finish up in December, but to make things easier i like to take online classes whenever I can. So, my question is does anyone know of any colleges that offer distance learning courses for computer science? I have been searching around and found a few potential classes, but not sure yet. I would like to gather some classes and see what i can get approval for. Class I need: Only need one C SC 437 Geometric Algorithms C SC 445 Algorithms C SC 473 Automata Only need one C SC 452 Operating Systems C SC 453 Compilers/Systems Software While i only need of each of the above courses i still need to take two more electives. These also have to be upper 400 level classes. So i can take multiple in each category. Some other classes I can take are: CSC 447 - Green Computing CSC 425 - Computer Networking CSC 460 - Database Design CSC 466 - Computer Security I hoping to take one or two of these courses over the summer. If not, then online over the regular semester would be ok too. Any help in helping find these classes would be awesome. Maybe you went to a college that offered distance learning. Some of these classes may be considered to be graduate courses too. Descriptions are listed below if you need. Thanks! Descriptions Computer Security This is an introductory course covering the fundamentals of computer security. In particular, the course will cover basic concepts of computer security such as threat models and security policies, and will show how these concepts apply to specific areas such as communication security, software security, operating systems security, network security, web security, and hardware-based security. Computer Networking Theory and practice of computer networks, emphasizing the principles underlying the design of network software and the role of the communications system in distributed computing. Topics include routing, flow and congestion control, end-to-end protocols, and multicast. Database Design Functions of a database system. Data modeling and logical database design. Query languages and query optimization. Efficient data storage and access. Database access through standalone and web applications. Green Computing This course covers fundamental principles of energy management faced by designers of hardware, operating systems, and data centers. We will explore basic energy management option in individual components such as CPUs, network interfaces, hard drives, memory. We will further present the energy management policies at the operating system level that consider performance vs. energy saving tradeoffs. Finally we will consider large scale data centers where energy management is done at multiple layers from individual components in the system to shutting down entries subset of machines. We will also discuss energy generation and delivery and well as cooling issues in large data centers. Compilers/Systems Software Basic concepts of compilation and related systems software. Topics include lexical analysis, parsing, semantic analysis, code generation; assemblers, loaders, linkers; debuggers. Operating Systems Concepts of modern operating systems; concurrent processes; process synchronization and communication; resource allocation; kernels; deadlock; memory management; file systems. Algorithms Introduction to the design and analysis of algorithms: basic analysis techniques (asymptotics, sums, recurrences); basic design techniques (divide and conquer, dynamic programming, greedy, amortization); acquiring an algorithm repertoire (sorting, median finding, strong components, spanning trees, shortest paths, maximum flow, string matching); and handling intractability (approximation algorithms, branch and bound). Automata Introduction to models of computation (finite automata, pushdown automata, Turing machines), representations of languages (regular expressions, context-free grammars), and the basic hierarchy of languages (regular, context-free, decidable, and undecidable languages). Geometric Algorithms The study of algorithms for geometric objects, using a computational geometry approach, with an emphasis on applications for graphics, VLSI, GIS, robotics, and sensor networks. Topics may include the representation and overlaying of maps, finding nearest neighbors, solving linear programming problems, and searching geometric databases.

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  • Is a base class with shared fields and functions good design

    - by eych
    I've got a BaseDataClass with shared fields and functions Protected Shared dbase as SqlDatabase Protected Shared dbCommand as DBCommand ... //also have a sync object used by the derived classes for Synclock'ing Protected Shared ReadOnly syncObj As Object = New Object() Protected Shared Sub Init() //initializes fields, sets connections Protected Shared Sub CleanAll() //closes connections, disposes, etc. I have several classes that derive from this base class. The derived classes have all Shared functions that can be called directly from the BLL with no instantiation. The functions in these derived classes call the base Init(), call their specific stored procs, call the base CleanAll() and then return the results. So if I have 5 derived classes with 10 functions each, totaling 50 possible function calls, since they are all Shared, the CLR only calls one at a time, right? All calls are queued to wait until each Shared function completes. Is there a better design with having Shared functions in your DAL and still have base class functions? Or since I have a base class, is it better to move towards instance methods within the DAL?

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  • How can I force maven to use my mock version of dependencies during the test phase.

    - by Jayd16
    Hi, so I have a Java application with a that accesses some web services. I want to mock out the appropriate classes so I can just use a few hard coded request/responses and I want maven to seamlessly use them during the tests and ignore them during the final build. I want maven2 to: 1)compile my mock classes 2)compile the main classes that depend on the mocked code 3)run tests 4)recompile any main classes with the real dependencies, not my mocks 5)finish up the maven install Ideally I want to just name my mock classes the same as my main class and just keep them in src/test/mocks or something. I'm kind of new to maven and so far it looks like maven will only compile the src/main and then src/test but I'm hoping I can have my way. Any ideas?

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  • Custom CallOut not displayed correctly in ios6?

    - by balu
    As i want to implement the custom call out in the mkmapview i am using these classes CalloutMapAnnotationView.h and CalloutMapAnnotationView.m I have extracted these classes from the following links https://github.com/asalom/Custom-Map-Annotation-Callouts/blob/master/Classes/CalloutMapAnnotationView.h https://github.com/asalom/Custom-Map-Annotation-Callouts/blob/master/Classes/CalloutMapAnnotationView.m These work fine in ios5 but in ios6 when i am clicking on the call out the map view is moving and call out is not showing correctly as shown in the below figures while i was zooming also its not coming correctly i have tried several ways to get rid out of this problem by checking the version of os and tried to change the some of the methods in the classes but of not use. After implementing these in ios5 map view coming like this In Ios6 This one not coming properly as like in ios5. for example

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  • How to get the stream of a public Facebook fanpage in php?

    - by Bundy
    Hi, I want to display my public fanpage feed onto my website via the Facebook API without requiring a login. I'm doing this require_once('../includes/classes/facebook-platform/php/facebook.php'); $fb = new Facebook($api_key, $secret); $fb->api_client->stream_get('',$app_id,'0','0','','','','','')); But I get this error Fatal error: Uncaught exception 'FacebookRestClientException' with message 'user id parameter or session key required' in includes/classes/facebook-platform/php/facebookapi_php5_restlib.php:3065 Stack trace: #0 includes/classes/facebook-platform/php/facebookapi_php5_restlib.php(1915): FacebookRestClient->call_method('facebook.stream...', Array) #1 facebook/api.php(12): FacebookRestClient->stream_get('', 13156929019, '0', '0', 30, '', '', '', '') #2 {main} thrown in includes/classes/facebook-platform/php/facebookapi_php5_restlib.php on line 3065 Then I figured, because of 'user id parameter or session key required', to add my user id to the call require_once('../includes/classes/facebook-platform/php/facebook.php'); $fb = new Facebook($api_key, $secret); $fb->api_client->stream_get(502945616,13156929019,$app_id,'0','0','','','','','')); But then I got this error Fatal error: Uncaught exception 'FacebookRestClientException' with message 'Session key invalid or no longer valid' I'm totally clueless :)

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  • java-maven2: How to include the a jar as depedency in pom so that I will be able to access test clas

    - by flavour-of-bru
    Hi, I have a set of functional jars(more than 3) that tests my source code. These jars just contains test classes and assisting asserter classes. I am creating a new performance jar that would import all the functional tests from these jars so that all can be run simultaneously. But when I include them as test dependencies in pom of current jar, what all I get to see is the classes in src/main/java. How can I include these functional jars as dependent jars so that I can also reference classes in src/test/java. In other words, how do I reference the test classes in other jars. In what way should I include the dependency as. Thanks for your support.

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  • Request/Response objects

    - by Dan
    I'm planning on using CXF's rest implementation. I'm thinking of simply annotating my entity classes with jaxb annotations, such as @XmlRootElement, in order to create response objects. The benefit being avoidance of code duplication. As for the (client) request object, which will be used by a separate web app, I'm thinking of 'copying' the entity classes, removing the orm annotations, and adding jaxb annotations. Based on the above: Are there any dangers of creating request/response objects from entity classes? My entity classes contain relational properties, if I were to annotate them with @XmlRootElement, how can I stop the relational properties from being added (or considered apart of) to the response object? Is there a better/easier way to create request objects rather than copying the entity classes, removing/adding annotations?

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  • What is the best practice, point of view of well experienced developers

    - by Damien MIRAS
    My manager pushes me to use his self defined best practices. All of these practices are based on is own assumptions. I disagree with them and I would like to have some feedback of well experienced people about these practices. I would prefer answers from people involved in the maintenance of huge products and people whom have maintained the product for years. Developers with 15+ years of experience are preferred because my manager has that much experience himself. I have 7 years of experience. Here are the practices he wants me to use: never extends classes, use composition and interface instead because extending classes are unmaintainable and difficult to debug. What I think about that Extend when needed, respect "Liskov's Substitution Principle" and you'll never be stuck with a problem, but prefer composition and decoration. I don't know any serious project which has banned inheriting, sometimes it's impossible to not use that, i.e. in a UI framework. Design patterns are just unusable. In PHP, for simple use cases (for example a user needs a web interface to view a database table), his "best practice" is: copy some random php code wich we own, paste and modify it, put html and php code in same file, never use classes in PHP, it doesn't work well for small jobs, and in fact it doesn't work well at all, there is no good tool to work with. Copy & paste PHP code is good practice for maintenance because scripts are independent, if you have a bug somewhere you can fix it without side effects. What I think about that: NEVER EVER COPY code or do it because you have five minutes to deliver something, you will do some refactoring after that. Copy & paste code is a beginners error, if you have errors you'll have the error everywhere any time you have pasted it's a nightmare to maintain. If you repsect the "Open Close Principle" you'll rarely get edge effects, use unit test if you are afraid of that. For small jobs in PHP use at least something you get or write the HTML separately from the PHP code and reuse it any time you need it. Classes in PHP are mature, not as mature as other languages like python or java, but they are usable. There is tools to work with classes in PHP like Zend Studio that work very well. The use of classes or not depends not on the language you use but the programming paradigm you have choosen. I'm a OOP developer, I use PHP5, why do I have to shoot myself in the foot? When you find a simple bug in the code, and you can fix it simply, if you are not working on the code where you have found it, never fix it, even if it takes 5 seconds. He says to me his "best practices" are driven by the fact that he has a lot of experience in maintaining software in production (14 years) and he now knows what works and what doesn't work, what the community says is a fad, and the people advocating such principles as never copy & paste code, are not evolved in maintaining applications. What I think about that: If you find a bug fix it if you can do it quickly inform the people who've touched that code before, check if you have not introduced a new bug, ideally add a unit test for it. I currently work on a web commerce project, which serves 15k unique users per day. The code base has to be maintained and has been maintained this way since 2005. Ideally you include a short description of your position and experience in terms of years effectively maintaining an application which has been in production for real.

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  • [PHP] Making a good singleton registry class structure which hold your objects

    - by Saif Bechan
    I am working on a web application in PHP. I have a singleton class called registry. This class will hold all the objects i need throughout my application, such as loader classes, template classes, database, classes, etc. When an object of the registry class is created I send it an array with the classes it need to load: // Create the registry $registry = registry::singleton(); // Store those core objects $registry->storeObjects(Array('session','db','page','template','errors')); In this example I only put some of the classes, to get the basic idea. Now I have some classes in the registry that use each other. For example the 'errors' object uses the 'page' object. Now I was wondering if it is a good practice to make an instance of the registry object in the errors object. Like this; class errors{ private $registry; public function __construct(){ $this->registry = registry::singleton(); } } So there is an instance of the registry object, inside an object of the registry object. This does not sound like a good idea to me. Anyone have a suggestion how to model such a thing?

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  • Reusing service proxies

    - by Hadi Eskandari
    I have a set of webservices that I connect to using Silverlight Client. I use proxies generated by "Add service reference" or SLSVCUTIL.exe tool to connect to this service. So far, I have only used one single service. Now I want to use another service on the same server. The problem is that, first service generated set of proxy classes for me, and second service will reuse the same set of classes (plus extra services/classes), e.g. CustomerService.SaveCustomer(Customer customer); OrderService.CheckCustomerLevel(Customer customer); The problem is when I add reference to the second service, I can not reuse the same namespace for the second one (VS error), and when I use a different namespace, the generated classes, although are essentially the same, reside in different namespace, hence different and I end up with two Customer classes in two different namespaces. Anyway around this? I just neeed to have two set of services, reusing the Customer class. I have already tried "reuse types in assembly / all assemblies" check mark when generating proxy classes, but it seems to have no effect. any help is greatly appreciated.

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  • classpath and class loading on weblogic

    - by qjeta
    Hello, I am trying to create and load dynamically classes in weblogic (10.3.2.0). It is ADF application which I deploy to the weblogic server. When I print ((GenericClassLoader)this.getClass().getClassLoader()).getFinderClassPath() I see the path to my directory (of course not just this path) C:\...\system11.1.1.2.36.55.36\DefaultDomain\servers\DefaultServer\tmp\_WL_user\test\753the\dynamicClasses (I have added directory dynamicClasses to manifest for deployment WAR profile). In this directory I create class files. I have checked it, files are really created there. When I try to load created class with the same classloader, for which I have printed classpath, ClassNotFoundException is thrown. It knows the path to the directory with classes and to jar file, but it doesn't load classes. With URLClassLoader I can load classes. But I need so that my classes would be seen by the classes loaded "usual" way. I am able to run it correctly just with system CLASSPATH. Please, do you know an explanation? Is the manifest file in WAR the wrong place for specifiing classpath? Thank you in advance Qjeta

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  • PHPthumbFactory file not found on upload

    - by ida
    library: http://wiki.github.com/masterexploder/PHPThumb/basic-usage i am using the PhpThumbFactory library to crop and upload an image. the error im receiving is this: Fatal error: Uncaught exception 'Exception' with message 'Image file not found: ' in /www/iaddesign/admin/classes/phpthumb/ThumbBase.inc.php:193 Stack trace: #0 /www/iaddesign/admin/classes/phpthumb/ThumbBase.inc.php(172): ThumbBase-triggerError('Image file not ...') #1 /www/iaddesign/admin/classes/phpthumb/ThumbBase.inc.php(110): ThumbBase-fileExistsAndReadable() #2 /www/iaddesign/admin/classes/phpthumb/GdThumb.inc.php(96): ThumbBase-_construct('', false) #3 /www/iaddesign/admin/classes/phpthumb/ThumbLib.inc.php(127): GdThumb-_construct('', Array, false) #4 /www/iaddesign/admin/portfolio.php(29): PhpThumbFactory::create('') #5 {main} thrown in /www/iaddesign/admin/classes/phpthumb/ThumbBase.inc.php on line 193 here is the snippet that is for the image to be uploaded. /* -------------------------------------------------------------------- */ /* SAVE ICONS */ /* -------------------------------------------------------------------- */ $icononsrc = $_FILES['iconoff']['tmp_name']; $iconoffsrc = $_FILES['iconon']['tmp_name']; $thumboff = PhpThumbFactory::create($iconoffsrc); $thumbon = PhpThumbFactory::create($icononsrc); $thumboff->adaptiveResize(200,151); $thumbon->adaptiveResize(200,151); $thumboffname = "uploads/".$_FILES['iconoff']['name']; $thumbonname = "uploads/".$_FILES['iconon']['name']; $thumboff->save($thumboffname, 'jpg'); $thumbon->save($thumbonname, 'jpg');

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  • Setting project for eclipse using maven

    - by egaga
    Hi, I'm trying to start modifying an existing application with Eclipse. Actually I had it working before, but I deleted the project, and now with "mvn eclipse:eclipse" I get the following: [INFO] Resource directory's path matches an existing source directory. Resources will be merged with the source directory src/main/resources [INFO] ------------------------------------------------------------------------ [ERROR] BUILD ERROR [INFO] ------------------------------------------------------------------------ [INFO] Request to merge when 'filtering' is not identical. Original=resource src/main/resources: output=target/classes, include=[atlassian-plugin.xml], exclude=[**/*.java], test=false, filtering=true, merging with=resource src/main/resources: output=target/classes, include=[], exclude=[atlassian-plugin.xml|**/*.java], test=false, filtering=false [INFO] ------------------------------------------------------------------------ [INFO] Trace org.apache.maven.lifecycle.LifecycleExecutionException: Request to merge when 'filtering' is not identical. Original=resource src/main/resources: output=target/classes, include=[atlassian-plugin.xml], exclude=[**/*.java], test=false, filtering=true, merging with=resource src/main/resources: output=target/classes, include=[], exclude=[atlassian-plugin.xml|**/*.java], test=false, filtering=false at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:583) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:512) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:482) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:330) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:291) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:142) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:336) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:129) at org.apache.maven.cli.MavenCli.main(MavenCli.java:287) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) at org.codehaus.classworlds.Launcher.main(Launcher.java:375) Caused by: org.apache.maven.plugin.MojoExecutionException: Request to merge when 'filtering' is not identical. Original=resource src/main/resources: output=target/classes, include=[atlassian-plugin.xm l], exclude=[**/*.java], test=false, filtering=true, merging with=resource src/main/resources: output=target/classes, include=[], exclude=[atlassian-plugin.xml|**/*.java], test=false, filtering=false at org.apache.maven.plugin.eclipse.EclipseSourceDir.merge(EclipseSourceDir.java:302) at org.apache.maven.plugin.eclipse.EclipsePlugin.extractResourceDirs(EclipsePlugin.java:1605) at org.apache.maven.plugin.eclipse.EclipsePlugin.buildDirectoryList(EclipsePlugin.java:1490) at org.apache.maven.plugin.eclipse.EclipsePlugin.createEclipseWriterConfig(EclipsePlugin.java:1180) at org.apache.maven.plugin.eclipse.EclipsePlugin.writeConfiguration(EclipsePlugin.java:1043) at org.apache.maven.plugin.ide.AbstractIdeSupportMojo.execute(AbstractIdeSupportMojo.java:511) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:451) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:558) ... 16 more

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  • iphone localization

    - by hardik
    hello all when i run the command to generate Localizable.string file from my terminal it says me bad entry in to the classes file the file gets generated but it has no entry in it infact it should have entry in it. Here is what i am running in my terminal but somehow it is not happening please guide me need to solve this Last login: Mon Jun 7 18:02:09 on ttys000 comp10:~ admin$ cd .. comp10:Users admin$ cd .. comp10:/ admin$ cd /Users/admin/Desktop/localisationwithcode comp10:localisationwithcode admin$ sudo usage: sudo -K | -L | -V | -h | -k | -l | -v usage: sudo [-HPSb] [-p prompt] [-u username|#uid] { -e file [...] | -i | -s | <command> } comp10:localisationwithcode admin$ genstrings Classes/*.m Bad entry in file Classes/localisationwithcodeViewController.m (line = 35): Argument is not a literal string. Bad entry in file Classes/localisationwithcodeViewController.m (line = 36): Argument is not a literal string. Bad entry in file Classes/localisationwithcodeViewController.m (line = 37): Argument is not a literal string. Bad entry in file Classes/localisationwithcodeViewController.m (line = 38): Argument is not a literal string. 2010-06-07 18:04:45.047 genstrings[3851:10b] _CFGetHostUUIDString: unable to determine UUID for host. Error: 35 comp10:localisationwithcode admin$

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  • Encapsulating user input of data for a class (C++)

    - by Dr. Monkey
    For an assignment I've made a simple C++ program that uses a superclass (Student) and two subclasses (CourseStudent and ResearchStudent) to store a list of students and print out their details, with different details shown for the two different types of students (using overriding of the display() method from Student). My question is about how the program collects input from the user of things like the student name, ID number, unit and fee information (for a course student) and research information (for research students): My implementation has the prompting for user input and the collecting of that input handled within the classes themselves. The reasoning behind this was that each class knows what kind of input it needs, so it makes sense to me to have it know how to ask for it (given an ostream through which to ask and an istream to collect the input from). My lecturer says that the prompting and input should all be handled in the main program, which seems to me somewhat messier, and would make it trickier to extend the program to handle different types of students. I am considering, as a compromise, to make a helper class that handles the prompting and collection of user input for each type of Student, which could then be called on by the main program. The advantage of this would be that the student classes don't have as much in them (so they're cleaner), but also they can be bundled with the helper classes if the input functionality is required. This also means more classes of Student could be added without having to make major changes to the main program, as long as helper classes are provided for these new classes. Also the helper class could be swapped for an alternative language version without having to make any changes to the class itself. What are the major advantages and disadvantages of the three different options for user input (fully encapsulated, helper class or in the main program)?

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  • This code is not submitting to a form? Why

    - by Ankur
    Since I am using get I expect to see the submitted values appended to the queryString but instead all I see is the URL of the servlet being called with nothing added at the end. <form id="editClassList" name="editClassList" method="get" action="EditClassList"> <% HashMap<Integer,String> classes = new HashMap<Integer,String>(); classes = (HashMap<Integer,String>) request.getAttribute("classes"); %> <% if(classes.size()==0){ %> <label><input class="small-link" type="text" id="add-this-class" size="42" value="" /></label> <% } %> <% Set<Integer> classIds = new HashSet<Integer>(); classIds = classes.keySet(); Iterator<Integer> itr = classIds.iterator(); while(itr.hasNext()){ int nextId = (Integer)itr.next(); %> <label><input class="small-link" type="text" id="<% out.print(nextId); %>" size="42" value="<% out.print(classes.get(nextId)); %>" /> </label> <img id="add-class" src="images/add.png" width="16" height="16" /><br /> <label><input class="small-link" type="text" id="class-to-add" size="42" value="" /></label> <% } %> <label><input type="submit" id="save-class-btn" value="Save Class(es)" /></label> </form>

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  • Reverse engineering and redistributing code from .NET Framework

    - by ToxicAvenger
    Once or twice I have been running into the following issue: Classes I want to reuse in my applications (and possibly redistribute) exist in the .NET Framework assemblies, but are marked internal or private. So it is impossible to reuse them directly. One way is to disassemble them, pick the pieces you need, put them in a different namespace, recompile (this can be some effort, but usually works quite well). My question is: Is this legal? Is this only legal for the classes of the Framework which are available as source code anyway? Is it illegal? I think that Microsoft marks them internal or private primarily so that they don't have to support them or can change the interfaces later. But some pieces - be it SharePoint or WCF - are almost impossible to properly extend by only using public classes from the apis. And rewriting everything from scratch generates a huge amount of effort, before you even start solving the problem you intended to solve. This is in my eyes not a "dirty" approach per se. The classes Microsoft ships are obviously well tested, if I reuse them under a different namespace I have "control" over them. If Microsoft changes the original implementation, my code won't be affected (some internals in WCF changed quite a bit with v4). It is not a super-clean approach. I would much prefer Microsoft making several classes public, because there are some nice classes hidden inside the framework.

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  • Allocating Entities within an Entity System

    - by miguel.martin
    I'm quite unsure how I should allocate/resemble my entities within my entity system. I have various options, but most of them seem to have cons associated with them. In all cases entities are resembled by an ID (integer), and possibly has a wrapper class associated with it. This wrapper class has methods to add/remove components to/from the entity. Before I mention the options, here is the basic structure of my entity system: Entity An object that describes an object within the game Component Used to store data for the entity System Contains entities with specific components Used to update entities with specific components World Contains entities and systems for the entity system Can create/destroy entites and have systems added/removed from/to it Here are my options, that I have thought of: Option 1: Do not store the Entity wrapper classes, and just store the next ID/deleted IDs. In other words, entities will be returned by value, like so: Entity entity = world.createEntity(); This is much like entityx, except I see some flaws in this design. Cons There can be duplicate entity wrapper classes (as the copy-ctor has to be implemented, and systems need to contain entities) If an Entity is destroyed, the duplicate entity wrapper classes will not have an updated value Option 2: Store the entity wrapper classes within an object pool. i.e. Entities will be return by pointer/reference, like so: Entity& e = world.createEntity(); Cons If there is duplicate entities, then when an entity is destroyed, the same entity object may be re-used to allocate another entity. Option 3: Use raw IDs, and forget about the wrapper entity classes. The downfall to this, I think, is the syntax that will be required for it. I'm thinking about doing thisas it seems the most simple & easy to implement it. I'm quite unsure about it, because of the syntax. i.e. To add a component with this design, it would look like: Entity e = world.createEntity(); world.addComponent<Position>(e, 0, 3); As apposed to this: Entity e = world.createEntity(); e.addComponent<Position>(0, 3); Cons Syntax Duplicate IDs

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  • How to refactor my design, if it seems to require multiple inheritance?

    - by Omega
    Recently I made a question about Java classes implementing methods from two sources (kinda like multiple inheritance). However, it was pointed out that this sort of need may be a sign of a design flaw. Hence, it is probably better to address my current design rather than trying to simulate multiple inheritance. Before tackling the actual problem, some background info about a particular mechanic in this framework: It is a simple game development framework. Several components allocate some memory (like pixel data), and it is necessary to get rid of it as soon as you don't need it. Sprites are an example of this. Anyway, I decided to implement something ala Manual-Reference-Counting from Objective-C. Certain classes, like Sprites, contain an internal counter, which is increased when you call retain(), and decreased on release(). Thus the Resource abstract class was created. Any subclass of this will obtain the retain() and release() implementations for free. When its count hits 0 (nobody is using this class), it will call the destroy() method. The subclass needs only to implement destroy(). This is because I don't want to rely on the Garbage Collector to get rid of unused pixel data. Game objects are all subclasses of the Node class - which is the main construction block, as it provides info such as position, size, rotation, etc. See, two classes are used often in my game. Sprites and Labels. Ah... but wait. Sprites contain pixel data, remember? And as such, they need to extend Resource. But this, of course, can't be done. Sprites ARE nodes, hence they must subclass Node. But heck, they are resources too. Why not making Resource an interface? Because I'd have to re-implement retain() and release(). I am avoiding this in virtue of not writing the same code over and over (remember that there are multiple classes that need this memory-management system). Why not composition? Because I'd still have to implement methods in Sprite (and similar classes) that essentially call the methods of Resource. I'd still be writing the same code over and over! What is your advice in this situation, then?

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  • Should accessible members of an internal class be internal too?

    - by Jeff Mercado
    I'm designing a set of APIs for some applications I'm working on. I want to keep the code style consistent in all the classes I write but I've found that there are a few inconsistencies that I'm introducing and I don't know what the best way to resolve them is. My example here is specific to C# but this would apply to any language with similar mechanisms. There are a few classes that I need for implementation purposes that I don't necessarily want to expose in the API so I make them internal whereever needed. Generally what I would do is design the class as I normally would (e.g., make members public/protected/private where necessary) and change the visibility level of the class itself to internal. So I might have a few classes that look like this: internal interface IMyItem { ItemSet AddTo(ItemSet set); } internal class _SmallItem : IMyItem { private readonly /* parameters */; public _SmallItem(/* small item parameters */) { /* ... */ } public ItemSet AddTo(ItemSet set) { /* ... */ } } internal abstract class _CompositeItem: IMyItem { private readonly /* parameters */; public _CompositeItem(/* composite item parameters */) { /* ... */ } public abstract object UsefulInformation { get; } protected void HelperMethod(/* parameters */) { /* ... */ } } internal class _BigItem : _CompositeItem { private readonly /* parameters */; public _BigItem(/* big item parameters */) { /* ... */ } public override object UsefulInformation { get { /* ... */ } } public ItemSet AddTo(ItemSet set) { /* ... */ } } In another generated class (part of a parser/scanner), there is a structure that contains fields for all possible values it can represent. The class generated is internal too but I have control over the visibility of the members and decided to make them internal as well. internal partial struct ValueType { internal string String; internal ItemSet ItemSet; internal IMyItem MyItem; } internal class TokenValue { internal static int EQ(ItemSetScanner scanner) { /* ... */ } internal static int NAME(ItemSetScanner scanner, string value) { /* ... */ } internal static int VALUE(ItemSetScanner scanner, string value) { /* ... */ } //... } To me, this feels odd because the first set of classes, I didn't necessarily have to make some members public, they very well could have been made internal. internal members of an internal type can only be accessed internally anyway so why make them public? I just don't like the idea that the way I write my classes has to change drastically (i.e., change all uses of public to internal) just because the class is internal. Any thoughts on what I should do here? It makes sense to me that I might want to make some members of a class declared public, internal. But it's less clear to me when the class is declared internal.

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  • web.xml not reloading in tomcat even after stop/start

    - by ajay
    This is in relation to:- http://stackoverflow.com/questions/2576514/basic-tomcat-servlet-error I changed my web.xml file, did ant compile , all, /etc/init.d/tomcat stop , start Even then my web.xml file in tomcat deployment is still unchanged. This is build.properties file:- app.name=hello catalina.home=/usr/local/tomcat manager.username=admin manager.password=admin This is my build.xml file. Is there something wrong with this:- <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <!-- General purpose build script for web applications and web services, including enhanced support for deploying directly to a Tomcat 6 based server. This build script assumes that the source code of your web application is organized into the following subdirectories underneath the source code directory from which you execute the build script: docs Static documentation files to be copied to the "docs" subdirectory of your distribution. src Java source code (and associated resource files) to be compiled to the "WEB-INF/classes" subdirectory of your web applicaiton. web Static HTML, JSP, and other content (such as image files), including the WEB-INF subdirectory and its configuration file contents. $Id: build.xml.txt 562814 2007-08-05 03:52:04Z markt $ --> <!-- A "project" describes a set of targets that may be requested when Ant is executed. The "default" attribute defines the target which is executed if no specific target is requested, and the "basedir" attribute defines the current working directory from which Ant executes the requested task. This is normally set to the current working directory. --> <project name="My Project" default="compile" basedir="."> <!-- ===================== Property Definitions =========================== --> <!-- Each of the following properties are used in the build script. Values for these properties are set by the first place they are defined, from the following list: * Definitions on the "ant" command line (ant -Dfoo=bar compile). * Definitions from a "build.properties" file in the top level source directory of this application. * Definitions from a "build.properties" file in the developer's home directory. * Default definitions in this build.xml file. You will note below that property values can be composed based on the contents of previously defined properties. This is a powerful technique that helps you minimize the number of changes required when your development environment is modified. Note that property composition is allowed within "build.properties" files as well as in the "build.xml" script. --> <property file="build.properties"/> <property file="${user.home}/build.properties"/> <!-- ==================== File and Directory Names ======================== --> <!-- These properties generally define file and directory names (or paths) that affect where the build process stores its outputs. app.name Base name of this application, used to construct filenames and directories. Defaults to "myapp". app.path Context path to which this application should be deployed (defaults to "/" plus the value of the "app.name" property). app.version Version number of this iteration of the application. build.home The directory into which the "prepare" and "compile" targets will generate their output. Defaults to "build". catalina.home The directory in which you have installed a binary distribution of Tomcat 6. This will be used by the "deploy" target. dist.home The name of the base directory in which distribution files are created. Defaults to "dist". manager.password The login password of a user that is assigned the "manager" role (so that he or she can execute commands via the "/manager" web application) manager.url The URL of the "/manager" web application on the Tomcat installation to which we will deploy web applications and web services. manager.username The login username of a user that is assigned the "manager" role (so that he or she can execute commands via the "/manager" web application) --> <property name="app.name" value="myapp"/> <property name="app.path" value="/${app.name}"/> <property name="app.version" value="0.1-dev"/> <property name="build.home" value="${basedir}/build"/> <property name="catalina.home" value="../../../.."/> <!-- UPDATE THIS! --> <property name="dist.home" value="${basedir}/dist"/> <property name="docs.home" value="${basedir}/docs"/> <property name="manager.url" value="http://localhost:8080/manager"/> <property name="src.home" value="${basedir}/src"/> <property name="web.home" value="${basedir}/web"/> <!-- ==================== External Dependencies =========================== --> <!-- Use property values to define the locations of external JAR files on which your application will depend. In general, these values will be used for two purposes: * Inclusion on the classpath that is passed to the Javac compiler * Being copied into the "/WEB-INF/lib" directory during execution of the "deploy" target. Because we will automatically include all of the Java classes that Tomcat 6 exposes to web applications, we will not need to explicitly list any of those dependencies. You only need to worry about external dependencies for JAR files that you are going to include inside your "/WEB-INF/lib" directory. --> <!-- Dummy external dependency --> <!-- <property name="foo.jar" value="/path/to/foo.jar"/> --> <!-- ==================== Compilation Classpath =========================== --> <!-- Rather than relying on the CLASSPATH environment variable, Ant includes features that makes it easy to dynamically construct the classpath you need for each compilation. The example below constructs the compile classpath to include the servlet.jar file, as well as the other components that Tomcat makes available to web applications automatically, plus anything that you explicitly added. --> <path id="compile.classpath"> <!-- Include all JAR files that will be included in /WEB-INF/lib --> <!-- *** CUSTOMIZE HERE AS REQUIRED BY YOUR APPLICATION *** --> <!-- <pathelement location="${foo.jar}"/> --> <!-- Include all elements that Tomcat exposes to applications --> <fileset dir="${catalina.home}/bin"> <include name="*.jar"/> </fileset> <pathelement location="${catalina.home}/lib"/> <fileset dir="${catalina.home}/lib"> <include name="*.jar"/> </fileset> </path> <!-- ================== Custom Ant Task Definitions ======================= --> <!-- These properties define custom tasks for the Ant build tool that interact with the "/manager" web application installed with Tomcat 6. Before they can be successfully utilized, you must perform the following steps: - Copy the file "lib/catalina-ant.jar" from your Tomcat 6 installation into the "lib" directory of your Ant installation. - Create a "build.properties" file in your application's top-level source directory (or your user login home directory) that defines appropriate values for the "manager.password", "manager.url", and "manager.username" properties described above. For more information about the Manager web application, and the functionality of these tasks, see <http://localhost:8080/tomcat-docs/manager-howto.html>. --> <taskdef resource="org/apache/catalina/ant/catalina.tasks" classpathref="compile.classpath"/> <!-- ==================== Compilation Control Options ==================== --> <!-- These properties control option settings on the Javac compiler when it is invoked using the <javac> task. compile.debug Should compilation include the debug option? compile.deprecation Should compilation include the deprecation option? compile.optimize Should compilation include the optimize option? --> <property name="compile.debug" value="true"/> <property name="compile.deprecation" value="false"/> <property name="compile.optimize" value="true"/> <!-- ==================== All Target ====================================== --> <!-- The "all" target is a shortcut for running the "clean" target followed by the "compile" target, to force a complete recompile. --> <target name="all" depends="clean,compile" description="Clean build and dist directories, then compile"/> <!-- ==================== Clean Target ==================================== --> <!-- The "clean" target deletes any previous "build" and "dist" directory, so that you can be ensured the application can be built from scratch. --> <target name="clean" description="Delete old build and dist directories"> <delete dir="${build.home}"/> <delete dir="${dist.home}"/> </target> <!-- ==================== Compile Target ================================== --> <!-- The "compile" target transforms source files (from your "src" directory) into object files in the appropriate location in the build directory. This example assumes that you will be including your classes in an unpacked directory hierarchy under "/WEB-INF/classes". --> <target name="compile" depends="prepare" description="Compile Java sources"> <!-- Compile Java classes as necessary --> <mkdir dir="${build.home}/WEB-INF/classes"/> <javac srcdir="${src.home}" destdir="${build.home}/WEB-INF/classes" debug="${compile.debug}" deprecation="${compile.deprecation}" optimize="${compile.optimize}"> <classpath refid="compile.classpath"/> </javac> <!-- Copy application resources --> <copy todir="${build.home}/WEB-INF/classes"> <fileset dir="${src.home}" excludes="**/*.java"/> </copy> </target> <!-- ==================== Dist Target ===================================== --> <!-- The "dist" target creates a binary distribution of your application in a directory structure ready to be archived in a tar.gz or zip file. Note that this target depends on two others: * "compile" so that the entire web application (including external dependencies) will have been assembled * "javadoc" so that the application Javadocs will have been created --> <target name="dist" depends="compile,javadoc" description="Create binary distribution"> <!-- Copy documentation subdirectories --> <mkdir dir="${dist.home}/docs"/> <copy todir="${dist.home}/docs"> <fileset dir="${docs.home}"/> </copy> <!-- Create application JAR file --> <jar jarfile="${dist.home}/${app.name}-${app.version}.war" basedir="${build.home}"/> <!-- Copy additional files to ${dist.home} as necessary --> </target> <!-- ==================== Install Target ================================== --> <!-- The "install" target tells the specified Tomcat 6 installation to dynamically install this web application and make it available for execution. It does *not* cause the existence of this web application to be remembered across Tomcat restarts; if you restart the server, you will need to re-install all this web application. If you have already installed this application, and simply want Tomcat to recognize that you have updated Java classes (or the web.xml file), use the "reload" target instead. NOTE: This target will only succeed if it is run from the same server that Tomcat is running on. NOTE: This is the logical opposite of the "remove" target. --> <target name="install" depends="compile" description="Install application to servlet container"> <deploy url="${manager.url}" username="${manager.username}" password="${manager.password}" path="${app.path}" localWar="file://${build.home}"/> </target> <!-- ==================== Javadoc Target ================================== --> <!-- The "javadoc" target creates Javadoc API documentation for the Java classes included in your application. Normally, this is only required when preparing a distribution release, but is available as a separate target in case the developer wants to create Javadocs independently. --> <target name="javadoc" depends="compile" description="Create Javadoc API documentation"> <mkdir dir="${dist.home}/docs/api"/> <javadoc sourcepath="${src.home}" destdir="${dist.home}/docs/api" packagenames="*"> <classpath refid="compile.classpath"/> </javadoc> </target> <!-- ====================== List Target =================================== --> <!-- The "list" target asks the specified Tomcat 6 installation to list the currently running web applications, either loaded at startup time or installed dynamically. It is useful to determine whether or not the application you are currently developing has been installed. --> <target name="list" description="List installed applications on servlet container"> <list url="${manager.url}" username="${manager.username}" password="${manager.password}"/> </target> <!-- ==================== Prepare Target ================================== --> <!-- The "prepare" target is used to create the "build" destination directory, and copy the static contents of your web application to it. If you need to copy static files from external dependencies, you can customize the contents of this task. Normally, this task is executed indirectly when needed. --> <target name="prepare"> <!-- Create build directories as needed --> <mkdir dir="${build.home}"/> <mkdir dir="${build.home}/WEB-INF"/> <mkdir dir="${build.home}/WEB-INF/classes"/> <!-- Copy static content of this web application --> <copy todir="${build.home}"> <fileset dir="${web.home}"/> </copy> <!-- Copy external dependencies as required --> <!-- *** CUSTOMIZE HERE AS REQUIRED BY YOUR APPLICATION *** --> <mkdir dir="${build.home}/WEB-INF/lib"/> <!-- <copy todir="${build.home}/WEB-INF/lib" file="${foo.jar}"/> --> <!-- Copy static files from external dependencies as needed --> <!-- *** CUSTOMIZE HERE AS REQUIRED BY YOUR APPLICATION *** --> </target> <!-- ==================== Reload Target =================================== --> <!-- The "reload" signals the specified application Tomcat 6 to shut itself down and reload. This can be useful when the web application context is not reloadable and you have updated classes or property files in the /WEB-INF/classes directory or when you have added or updated jar files in the /WEB-INF/lib directory. NOTE: The /WEB-INF/web.xml web application configuration file is not reread on a reload. If you have made changes to your web.xml file you must stop then start the web application. --> <target name="reload" depends="compile" description="Reload application on servlet container"> <reload url="${manager.url}" username="${manager.username}" password="${manager.password}" path="${app.path}"/> </target> <!-- ==================== Remove Target =================================== --> <!-- The "remove" target tells the specified Tomcat 6 installation to dynamically remove this web application from service. NOTE: This is the logical opposite of the "install" target. --> <target name="remove" description="Remove application on servlet container"> <undeploy url="${manager.url}" username="${manager.username}" password="${manager.password}" path="${app.path}"/> </target> </project>

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  • shell script over SSH ends unexpectedly after running 'ant build'

    - by YShin
    I wrote a shell script that runs on remote host to build source code with 'ant build' command, and then distribute the built binary to other servers. However, right after Ant build is over successfully(I can see the command line output saying Build was successful), the ssh session ends and whatever commands after 'ant build' does not get executed. I'm confused what might be cause of this behavior. I suspected that it might be because the 'ant build' command takes too long time, and SSH somehow quits itself after that long command. But I don't think that's correct since if I just do 'sleep 60' in place of 'ant build' command, it actually execute latter commands as intended. I'm new at shell programming, so I might have made some silly misassumption. Can someone provide a pointer to a possible cause of this problem? My shell script #!/bin/bash # Inject some variables ssh -T $SSH_USER@$SSH_URL "setenv REMOTE_BASE_DIR $REMOTE_BASE_DIR; setenv CASSANDRA_SRC_TAR_FILE $CASSANDRA_SRC_TAR_FILE; setenv CASSANDRA_SRC_DIR_NAME $CASSANDRA_SRC_DIR_NAME; setenv CLUSTER_SIZE $CLUSTER_SIZE; setenv REMOTE_REDEPLOY_SCRIPT $REMOTE_REDEPLOY_SCRIPT; /bin/bash" << 'EOF' export JAVA_HOME=/usr/lib/jvm/jdk1.7.0 cd $REMOTE_BASE_DIR/$CASSANDRA_SRC_DIR_NAME echo "## Building Cassandra source" ant clean build # Anything after this doesn't run echo "## Ant Build is over. Invoking redeploy script on remote nodes" # Invoke redeploy script for each node for (( i=0; i < CLUSTER_SIZE; i++)) do echo "## Invoking redeploy script on node-$i" done Command-line output ## Building Cassandra source Buildfile: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build.xml clean: [delete] Deleting directory /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/test [delete] Deleting directory /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/classes [delete] Deleting directory /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/src/gen-java [delete] Deleting directory /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/src/resources/org/apache/cassandra/config init: [mkdir] Created dir: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/classes/main [mkdir] Created dir: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/classes/thrift [mkdir] Created dir: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/test/lib [mkdir] Created dir: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/test/classes [mkdir] Created dir: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/src/gen-java maven-ant-tasks-localrepo: maven-ant-tasks-download: maven-ant-tasks-init: maven-declare-dependencies: maven-ant-tasks-retrieve-build: init-dependencies: [echo] Loading dependency paths from file: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/build-dependencies.xml check-gen-cli-grammar: gen-cli-grammar: [echo] Building Grammar /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/src/java/org/apache/cassandra/cli/Cli.g .... check-gen-cql2-grammar: gen-cql2-grammar: [echo] Building Grammar /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/src/java/org/apache/cassandra/cql/Cql.g ... check-gen-cql3-grammar: gen-cql3-grammar: [echo] Building Grammar /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/src/java/org/apache/cassandra/cql3/Cql.g ... build-project: [echo] apache-cassandra: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build.xml [javac] Compiling 43 source files to /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/classes/thrift [javac] Note: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/interface/thrift/gen-java/org/apache/cassandra/thrift/Cassandra.java uses or overrides a deprecated API. [javac] Note: Recompile with -Xlint:deprecation for details. [javac] Note: Some input files use unchecked or unsafe operations. [javac] Note: Recompile with -Xlint:unchecked for details. [javac] Compiling 865 source files to /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/classes/main [javac] Note: Some input files use or override a deprecated API. [javac] Note: Recompile with -Xlint:deprecation for details. [javac] Note: Some input files use unchecked or unsafe operations. [javac] Note: Recompile with -Xlint:unchecked for details. createVersionPropFile: [mkdir] Created dir: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/src/resources/org/apache/cassandra/config [propertyfile] Creating new property file: /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/src/resources/org/apache/cassandra/config/version.properties [copy] Copying 3 files to /scratch/ISS/shin14/repos/apache-cassandra-2.0.8-src-0713/build/classes/main build: BUILD SUCCESSFUL Total time: 32 seconds

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  • Does anyone really understand how HFSC scheduling in Linux/BSD works?

    - by Mecki
    I read the original SIGCOMM '97 PostScript paper about HFSC, it is very technically, but I understand the basic concept. Instead of giving a linear service curve (as with pretty much every other scheduling algorithm), you can specify a convex or concave service curve and thus it is possible to decouple bandwidth and delay. However, even though this paper mentions to kind of scheduling algorithms being used (real-time and link-share), it always only mentions ONE curve per scheduling class (the decoupling is done by specifying this curve, only one curve is needed for that). Now HFSC has been implemented for BSD (OpenBSD, FreeBSD, etc.) using the ALTQ scheduling framework and it has been implemented Linux using the TC scheduling framework (part of iproute2). Both implementations added two additional service curves, that were NOT in the original paper! A real-time service curve and an upper-limit service curve. Again, please note that the original paper mentions two scheduling algorithms (real-time and link-share), but in that paper both work with one single service curve. There never have been two independent service curves for either one as you currently find in BSD and Linux. Even worse, some version of ALTQ seems to add an additional queue priority to HSFC (there is no such thing as priority in the original paper either). I found several BSD HowTo's mentioning this priority setting (even though the man page of the latest ALTQ release knows no such parameter for HSFC, so officially it does not even exist). This all makes the HFSC scheduling even more complex than the algorithm described in the original paper and there are tons of tutorials on the Internet that often contradict each other, one claiming the opposite of the other one. This is probably the main reason why nobody really seems to understand how HFSC scheduling really works. Before I can ask my questions, we need a sample setup of some kind. I'll use a very simple one as seen in the image below: Here are some questions I cannot answer because the tutorials contradict each other: What for do I need a real-time curve at all? Assuming A1, A2, B1, B2 are all 128 kbit/s link-share (no real-time curve for either one), then each of those will get 128 kbit/s if the root has 512 kbit/s to distribute (and A and B are both 256 kbit/s of course), right? Why would I additionally give A1 and B1 a real-time curve with 128 kbit/s? What would this be good for? To give those two a higher priority? According to original paper I can give them a higher priority by using a curve, that's what HFSC is all about after all. By giving both classes a curve of [256kbit/s 20ms 128kbit/s] both have twice the priority than A2 and B2 automatically (still only getting 128 kbit/s on average) Does the real-time bandwidth count towards the link-share bandwidth? E.g. if A1 and B1 both only have 64kbit/s real-time and 64kbit/s link-share bandwidth, does that mean once they are served 64kbit/s via real-time, their link-share requirement is satisfied as well (they might get excess bandwidth, but lets ignore that for a second) or does that mean they get another 64 kbit/s via link-share? So does each class has a bandwidth "requirement" of real-time plus link-share? Or does a class only have a higher requirement than the real-time curve if the link-share curve is higher than the real-time curve (current link-share requirement equals specified link-share requirement minus real-time bandwidth already provided to this class)? Is upper limit curve applied to real-time as well, only to link-share, or maybe to both? Some tutorials say one way, some say the other way. Some even claim upper-limit is the maximum for real-time bandwidth + link-share bandwidth? What is the truth? Assuming A2 and B2 are both 128 kbit/s, does it make any difference if A1 and B1 are 128 kbit/s link-share only, or 64 kbit/s real-time and 128 kbit/s link-share, and if so, what difference? If I use the seperate real-time curve to increase priorities of classes, why would I need "curves" at all? Why is not real-time a flat value and link-share also a flat value? Why are both curves? The need for curves is clear in the original paper, because there is only one attribute of that kind per class. But now, having three attributes (real-time, link-share, and upper-limit) what for do I still need curves on each one? Why would I want the curves shape (not average bandwidth, but their slopes) to be different for real-time and link-share traffic? According to the little documentation available, real-time curve values are totally ignored for inner classes (class A and B), they are only applied to leaf classes (A1, A2, B1, B2). If that is true, why does the ALTQ HFSC sample configuration (search for 3.3 Sample configuration) set real-time curves on inner classes and claims that those set the guaranteed rate of those inner classes? Isn't that completely pointless? (note: pshare sets the link-share curve in ALTQ and grate the real-time curve; you can see this in the paragraph above the sample configuration). Some tutorials say the sum of all real-time curves may not be higher than 80% of the line speed, others say it must not be higher than 70% of the line speed. Which one is right or are they maybe both wrong? One tutorial said you shall forget all the theory. No matter how things really work (schedulers and bandwidth distribution), imagine the three curves according to the following "simplified mind model": real-time is the guaranteed bandwidth that this class will always get. link-share is the bandwidth that this class wants to become fully satisfied, but satisfaction cannot be guaranteed. In case there is excess bandwidth, the class might even get offered more bandwidth than necessary to become satisfied, but it may never use more than upper-limit says. For all this to work, the sum of all real-time bandwidths may not be above xx% of the line speed (see question above, the percentage varies). Question: Is this more or less accurate or a total misunderstanding of HSFC? And if assumption above is really accurate, where is prioritization in that model? E.g. every class might have a real-time bandwidth (guaranteed), a link-share bandwidth (not guaranteed) and an maybe an upper-limit, but still some classes have higher priority needs than other classes. In that case I must still prioritize somehow, even among real-time traffic of those classes. Would I prioritize by the slope of the curves? And if so, which curve? The real-time curve? The link-share curve? The upper-limit curve? All of them? Would I give all of them the same slope or each a different one and how to find out the right slope? I still haven't lost hope that there exists at least a hand full of people in this world that really understood HFSC and are able to answer all these questions accurately. And doing so without contradicting each other in the answers would be really nice ;-)

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