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  • Code Golf: MSM Random Number Generator

    - by Vivin Paliath
    The challenge The shortest code by character count that will generate (pseudo)random numbers using the Middle-Square Method. The Middle-Square Method of (pseudo)random number generation was first suggested by John Von Neumann in 1946 and is defined as follows: Rn+1 = mid((Rn)2, m) For example: 34562 = 11943936 mid(11943936) = 9439 94392 = 89094721 mid(89094721) = 0947 9472 = 896809 mid(896809) = 9680 96802 = 93702400 mid(93702400) = 7024 Test cases: A seed of 8653 should give the following numbers (first 10): 8744, 4575, 9306, 6016, 1922, 6940, 1636, 6764, 7516, 4902

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  • More efficient programming than Web.py?

    - by Luke Stanley
    I love webpy, it's really quite Pythonic but I don't like having to add the url mappings and create a class, typically with just 1 function inside it. I'm interested in minimising code typing and prototyping fast. Does anyone have any up and coming suggestions such as Bobo, Bottle, Denied, cherrypy for a lover of webpy's good things? What makes it a good reason? Also I don't mind missing out (strongly) text based templating systems, I use object oriented HTML generation.

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  • Eclipselink factory.createEntityManager() stalls with more than one instance running

    - by Raven
    Hi, with my RCP program I have the problem that I want to have more than one copy running on my PC. The first instance runs very good. If I start the second instance, everything is fine until I want to access the database. Using this code: .. Map properties = new HashMap(); properties.put("javax.persistence.jdbc.driver", dbDriver); properties.put("javax.persistence.jdbc.url", dbUrl); properties.put("javax.persistence.jdbc.user", dbUser); properties.put("javax.persistence.jdbc.password", dbPass); try { factory = Persistence.createEntityManagerFactory( PERSISTENCE_UNIT_NAME, properties); } catch (Exception e) { System.out.println(e); } em=factory.createEntityManager(); // the second instance stops here ... with an persistence.xml of <?xml version="1.0" encoding="UTF-8"?> <persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"> <persistence-unit name="default"> <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> <class>myclasshere</class> <properties> <property name="eclipselink.ddl-generation" value="create-tables" /> <property name="eclipselink.ddl-generation.output-mode" value="database" /> <property name="eclipselink.jdbc.read-connections.min" value="1" /> <property name="eclipselink.jdbc.write-connections.min" value="1" /> <property name="eclipselink.jdbc.batch-writing" value="JDBC" /> <property name="eclipselink.logging.level" value="SEVERE" /> <property name="eclipselink.logging.timestamp" value="false" /> <property name="eclipselink.logging.session" value="false" /> <property name="eclipselink.logging.thread" value="false" /> </properties> </persistence-unit> </persistence> The program stalls / does not continue in the second instance beyond this step: em=factory.createEntityManager(); Debugging the program step by step showed me, that nothing happens at this point. Perhaps the program runs into a timeout. I havent been wainting for more than 1 minute.... Do you have any clues what might cause this stall might?

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  • MySQL id sequence

    - by Michal Fronczyk
    Is this a correct way for id generation in MySQL ? INSERT INTO Picture (PictureId,First_pick,Title,Description,File_Name,Is_Vertical)VALUES ((SELECT max(pictureid)+1 FROM Picture),0,?,?,?,?) I mean if it is guaranted that PictureId will be unique when this query is run by many threads ? I can't modify table structure. Should I use any specific locks, index or transaction isolation level ? Regards, Michal

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  • How are distributed services better than distributed objects?

    - by Gabriel Šcerbák
    I am not interested in the technology e.g. CORBA vs Web Services, I am interested in principles. When we are doing OOP, why should we have something so procedural at higher level? Is not it the same as with OOP and relational databases? Often services are supported through code generation, apart from boilerplate, I think it is because we new SOM - service object mapper. So again, what are the reasons for wervices rather than objects?

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  • C# code generator

    - by Neir0
    Can someone recommend a simple c# code generator. I just looking something with methods like: GenClass = CreateNewClass(AccessModifier,Name......) GenClass.Add(new Method(AccessModifier,RetType,Name....){code=@"....."} GenClass.Add(new Property(AccessModifier,Type, Name....) ........... etc and after creating all classes\methods and other members we call Code Generation function(where we can specific some parametrs) Is there such opensource code generator?

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  • cool project to use a genetic algorithm for?

    - by Ryan
    I'm looking for a practical application to use a genetic algorithm for. Some things that have thought of are: Website interface optimization Vehicle optimization with a physics simulator Genetic programming Automatic test case generation But none have really popped out at me. So if you had some free time (a few months) to spend on a genetic algorithms project, what would you choose to tackle?

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  • Tags/Documentation with SVN Project in Eclipse?

    - by Kevin
    I've searched around with this and haven't found any clear answers. I'm using Eclipse PDT. It seems that if I create a PHP Project, tags work (@todo, etc). However, if I create a project from SVN (still PHP based), tags don't work at all. Does anyone know how to make tags and doc generation work on a per project basis and still import projects from a SVN repo?

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  • .DS_Store valid in Leopard and Snow Leopard

    - by madmw
    Scripts to generate a DMG image disk for mac usually copy a .DS_Store file with folder customizations (icons sizes, positions, image background, etc.) You customize a read/write copy of the DMG, then copy the .DS_Store and use it to automate the DMG generation. It seems .DS_Store made in Leopard doesn't work in Snow Leopard and viceversa. A DMG created in Snow Leopard won't show the background image in Leopard. Is there a way to made a .DS_Store file that works in both OSX?

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  • Eclipse Debug Mode disrupting SQL Server 2005 Stored Procedure access

    - by Sathish
    We have a strange problem in our team. When a developer is using Eclipse in Debug mode, SQL Server 2005 blocks other developers from accessing a stored procedure. Debug session typically involves opening Hibernate session to persist an entity which could be accessing a stored procedure used for Primary key generation. Debugging is done in business logic code and rarely in JDBC stored procedure call. Is there any way to configure SQL server or the stored procedure so that other developers are not blocked?

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  • How to create Data Entry User Interfaces in asp.net?

    - by Wael Dalloul
    Suppose that you have a big Data Entry Web Application Like Microsoft CRM, what is the strategies and technologies that you follow to build a website like it? I don't want to use any Dynamic Web Page Generation software, because it have a lot of limitations.. Also I don't want to design every page and repeat everything what's the best approach? Any Ideas or Head lines on this issue? Thanks in Advance...

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  • secure client/server program in C with OpenSSL

    - by Samantha
    Hello, I'm trying to write a secure client/server program in C with OpenSSL. I've found a code sample at http://www.rtfm.com/openssl-examples/ but I get this error: server: SSL read problem client: Certificate doesn't verify I think the problem is with the certificate generation, but I cannot find it. Any idea? Thanks

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  • Symfony2 impersonation route parameters missing

    - by jaPa
    I receive an error when I change pages if I am impersonated as another user in Symfony2. It only happens when the route has additional parameters. There is no sign of route generation at the pointed line number. Controller action /** * @Route("/member/{id}", name="member_page") * @Template() */ public function memberAction($id) Error An exception has been thrown during the rendering of a template ("Some mandatory parameters are missing ("slug") to generate a URL for route "member_page".") in members.html.twig at line 2.

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  • Why was .NET called .NET?

    - by compie
    I always wondered why Microsoft chose such a strange, search-engine-unfriendly name for such a great platform. Couldn't they have come up with something better? Apparently the codename was NGWS: Microsoft started development on the .NET Framework in the late 1990s originally under the name of Next Generation Windows Services (NGWS). [Wikipedia] Does anyone know why they chose the name .NET?

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  • object explorer control

    - by šljaker
    I'm writing application for code generation and I would like to use object explorer control such as the one in visual studio, so I can manually design my objects. How can I do that?

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  • How can I import one Gradle script into another?

    - by Ant
    Hi all, I have a complex gradle script that wraps up a load of functionality around building and deploying a number of netbeans projects to a number of environments. The script works very well, but in essence it is all configured through half a dozen maps holding project and environment information. I want to abstract the tasks away into another file, so that I can simply define my maps in a simple build file, and import the tasks from the other file. In this way, I can use the same core tasks for a number of projects and configure those projects with a simple set of maps. Can anyone tell me how I can import one gradle file into another, in a similar manner to Ant's task? I've trawled Gradle's docs to no avail so far. Additional Info After Tom's response below, I thought I'd try and clarify exactly what I mean. Basically I have a gradle script which runs a number of subprojects. However, the subprojects are all Netbeans projects, and come with their own ant build scripts, so I have tasks in gradle to call each of these. My problem is that I have some configuration at the top of the file, such as: projects = [ [name:"MySubproject1", shortname: "sub1", env:"mainEnv", cvs_module="mod1"], [name:"MySubproject2", shortname: "sub2", env:"altEnv", cvs_module="mod2"] ] I then generate tasks such as: projects.each({ task "checkout_$it.shortname" << { // Code to for example check module out from cvs using config from 'it'. } }) I have many of these sort of task generation snippets, and all of them are generic - they entirely depend on the config in the projects list. So what I want is a way to put this in a separate script and import it in the following sort of way: projects = [ [name:"MySubproject1", shortname: "sub1", env:"mainEnv", cvs_module="mod1"], [name:"MySubproject2", shortname: "sub2", env:"altEnv", cvs_module="mod2"] ] import("tasks.gradle") // This will import and run the script so that all tasks are generated for the projects given above. So in this example, tasks.gradle will have all the generic task generation code in, and will get run for the projects defined in the main build.gradle file. In this way, tasks.gradle is a file that can be used by all large projects that consist of a number of sub-projects with Netbeans ant build files.

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  • Reflection: Get FieldInfo from PropertyInfo

    - by Ed Woodcock
    Hi guys. I'm doing some dynamic code generation using Reflection, and I've come across a situation where I need to get the backing field of a property (if it has one) in order to use its FieldInfo object. Now, I know you can use .IsDefined(typeof(CompilerGeneratedAttribute), false); on a FieldInfo to discover whether it's autogenerated, so I assume there's a similar thing for Properties which auto-generate fields? Cheers, Ed

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  • Cakephp 1.3 database migration with

    - by Vijay Kumbhar
    Hello All, I am using cakephp 1.3 on LAMP (ubuntu 9.04) platform. Trying the database migration with cakephp inbuilt schema generation script. I am inside the app folder & When i fire a command in the terminal 'cake schema run create schema file name', It is giving me the error that "Error:schema.php could not be included." Can anybody help me out?

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  • JavaCC for .NET?

    - by Tigraine
    Hi Guys, I've been spending some time doing JavaCC parser generation for assignments at University and was wondering if there is a similar simple parser generator framework for .NET available? I know there is ANTLR, but I found it a bit too big for my taste and really started to like the simplicity that JavaCC brings.. greetings Daniel

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  • .NET JIT Code Cache leaking?

    - by pitchfork
    We have a server component written in .Net 3.5. It runs as service on a Windows Server 2008 Standard Edition. It works great but after some time (days) we notice massive slowdowns and an increased working set. We expected some kind of memory leak and used WinDBG/SOS to analyze dumps of the process. Unfortunately the GC Heap doesn’t show any leak but we noticed that the JIT code heap has grown from 8MB after the start to more than 1GB after a few days. We don’t use any dynamic code generation techniques by our own. We use Linq2SQL which is known for dynamic code generation but we don’t know if it can cause such a problem. The main question is if there is any technique to analyze the dump and check where all this Host Code Heap blocks that are shown in the WinDBG dumps come from? [Update] In the mean time we did some more analysis and had Linq2SQL as probable suspect, especially since we do not use precompiled queries. The following example program creates exactly the same behaviour where more and more Host Code Heap blocks are created over time. using System; using System.Linq; using System.Threading; namespace LinqStressTest { class Program { static void Main(string[] args) { for (int i = 0; i < 100; ++ i) ThreadPool.QueueUserWorkItem(Worker); while(runs < 1000000) { Thread.Sleep(5000); } } static void Worker(object state) { for (int i = 0; i < 50; ++i) { using (var ctx = new DataClasses1DataContext()) { long id = rnd.Next(); var x = ctx.AccountNucleusInfos.Where(an => an.Account.SimPlayers.First().Id == id).SingleOrDefault(); } } var localruns = Interlocked.Add(ref runs, 1); System.Console.WriteLine("Action: " + localruns); ThreadPool.QueueUserWorkItem(Worker); } static Random rnd = new Random(); static long runs = 0; } } When we replace the Linq query with a precompiled one, the problem seems to disappear.

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