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• Simple but good pattern for EJB

  - by Sara

  What would you suggest as a good and practical but simple pattern for a soloution with: HTML + JSP (as a view/presentation) SERVLETS (controller, request, session-handling) EJB (persistence, businesslogic) MySQL DB And is it necessary to use an own layer of DAO for persistence? I use JPA to persist objects to my DB. Should I withdraw business logic from my EJB? Sources online all tell me different things and confuses me...

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• [bash] Escape a string for sed search pattern

  - by Alexander Gladysh

  In my bash script I have an external (received from user) string, which I should use in sed pattern. REPLACE="<funny characters here>" sed "s/KEYWORD/$REPLACE/g" How can I escape the $REPLACE string so it would be safely accepted by sed as a literal replacement? NOTE: The KEYWORD is a dumb substring with no matches etc. It is not supplied by user.

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• Disposable Registry: good pattern?

  - by illdev

  Imagine a: public class Global : IDisposable { private static readonly List<IDisposable> Disposables = new List<IDisposable>(); public void ApplicationStart() { var heavyLifter = new HeavyLifter(); Disposables.Add(heavyLifter); } public void Dispose() { Disposables.ForEach(d => d.Dispose()); } } I am somewhat inexperienced with IDisposable. Is this a viable pattern?

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• Python singleton pattern

  - by Javier Garcia

  Hi, someone can tell me why this is incorrect as a singleton pattern: class preSingleton(object): def __call__(self): return self singleton = preSingleton() a = singleton() b = singleton() print a==b a.var_in_a = 100 b.var_in_b = 'hello' print a.var_in_b print b.var_in_a Edit: The above code prints: True hello 100 thank you very much

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• php regular expression to match specific url pattern

  - by zen

  I'd like to "grab" a few hundred urls from a few hundred html pages. Pattern: <h2><a href="http://www.the.url.might.be.long/urls.asp?urlid=1" target="_blank">The Website</a></h2>

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• Multilevel asynchronous method call pattern in c#

  - by michajas

  Hi, I have design problem regarding async calls to method. I'd like to know best/good pattern to call async method, which calls another async method, which calls another async method :) In other words, I have WCF service reference created with async methods and I want to call them from another async method which is called by other async method. All this for non blocking GUI. Thanks!

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• Is there a pattern for this?

  - by Timmy

  i have something that requires a matrix of values, similar to pokemon: i have a class object for each of the types, is there a pattern or a good way to implement this, as a middle layer or in the classes?

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• javascript regex pattern concatenate with variable

  - by chazzuka

  How to create regex pattern which is concatenate with variable, something like this: var test ="52"; var re = new RegExp("/\b"+test+"\b/"); alert('51,52,53'.match(re)); Thanks

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• Python pattern search in a string

  - by Hulk

  In python if a string contains the following, print valid_str The output of this is Record is positive in tone: It emphasizes "what a child can do and his or her achievements, as opposed to what he or she cannot do," explains the It is useful for progress and achievements during office conferences How to search for the pattern It is useful in the above string and if not found return something. Thanks..

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• ASP.net Intergation Pattern - examples

  - by nettguy

  Recently lot of interviewers are asking "What are the integration patterns are you familiar with?". I know design patterns,what is integration pattern then?

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• Is the provider pattern an implementation of IOC?

  - by blahblah

  Is the provider pattern an implementation of IOC? If not, why not? (reading through martin fowlers article on ioc)

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• Activator.CreateInstance vs Factory Pattern

  - by Heka

  What is the difference between Activator.CreateInstance and factory? Can they be used interchangeably? Or stil do we need a factory pattern?

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• How to implement MVP pattern for a tabcontrol?

  - by John_Sheares

  I have an application that has a tabcontrol with 5 tabpages of information that user interacts with. Also, there are contextual menus and toolbars for editing and formatting the information. Do I create a different view & presenter for each tab page or the tabcontrol iteself? How do I apply the pattern to the toolbars and menus that can interact with any of the tabs?

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• Getting pattern string from java SimpleDateFormat

  - by D Lawson

  I have a SimpleDateFormat object that I retrieve from some internationalization utilities. Parsing dates is all fine and good, but I would like to be able show a formatting hint to my users like "MM/dd/yyyy". Is there a way to get the formatting pattern from a SimpleDateFormat object?

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• DI and Singleton Pattern in one implementation

  - by Tony

  I want to refactor some code using the Windsor IOC/DI framework, but my issue is that I have some Singleton classes and Factory pattern classes and I am not sure that one can implement a Singleton or Factory using DI. Has anyone any ideas if that is possible and how?

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• Is it good, that every PHP class implements a Singleton pattern

  - by Sbioko

  Hello, is it good, that every PHP class implements a Singleton pattern? I think, it will be less memory usage because of it. Is it right opinion? Thanks!

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• Name the pattern - Create, Set, Execute, Destroy?

  - by Seb Nilsson

  I somewhere heard that the .NET Framework was built around specific pattern, which they tried to uphold as much as possible. var rsa = new RSACryptoServiceProvider(); // Create rsa.ImportParameters(GetParameters()); // Set byte[] encrypted = rsa.Encrypt(data, true); // Execute // Destroyed by garbage-collector Are there any variants of this? What are the general pros and cons?

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• Decorator Design Pattern - Not Possible

  - by Lennie

  Hi, This is more a design question... You can't do a decorate design pattern if: 1) The object is marked "sealed" meaning you can't extend from it. 2) or you want to override a method but its not virtual. What can you do then? Taken that you can't change the class source code if you don't have the source code (like a 3rd party library).

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• Design pattern to separate messages from actual process.

  - by Manish Gupta

  I am having a C# application to sync data between PC and palm devices. There are codes written like below: showMessage("synchronizing Table1"); Sync(destTable1,sourceTable1); Sync(destTable2,sourceTable2); showMessage("synchronizing Table2"); // more code How do I separate the actual process of synchronizing from displaying message? Which design pattern to follow? Thanks in advance...

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• pattern to transfer search model to dao

  - by zeroed

  We have a dao as a project (jar file). Clients use its interfaces and factories to operate with database. Using standard CRUD operations, dao allows you to search an entity by some search criteria. What is the best way to represent this criteria? Is transfer object appropriate pattern in this situation? How should client create SearchModel instance? Please, share. Regards.

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• Pattern for creating a database schema using JDBC

  - by Space_C0wb0y

  I have a Java-application that loads data from a legacy file format into an SQLite-Database using JDBC. If the database file specified does not exist, it is supposed to create a new one. Currently the schema for the database is hardcoded in the application. I would much rather have it in a separate file as an SQL-Script, but apparently there is now easy way to execute an SQL-Script though JDBC. Is there any other way or a pattern to achieve something like this?

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• Acquisition Design pattern

  - by Tony

  Anybody any idea where I can find details about this pattern? It is used in relation to threading. C++

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• Javascript plugins design pattern like jQuery

  - by Marco Demaio

  Could someone write down a very simple basic example in javascript to conceptualize (and hopefully make me understand) how the jQuery plugin design pattern is done and how it works? I'm not interested in how creating plugin for jQuery (so no jQuery code here at all). I'm interested in a simple explanation (maybe with a bit of Javascript code) to explain how it is done the plugin concept. Plz do not reply me to go and read jQuery code, I tried, but I it's too complex, otherwise I would have not post a question here.

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• Implementing the factory design pattern using metaclasses in python

  - by noam

  I found a lot of links on metaclasses, and most of them mention that they are useful for implementing factory methods. Can you show me an example of using metaclasses to implement the design pattern?

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• SQl Server error handling pattern

  - by Patrick Honorez

  Hi all. I am not an expert on SQl Server. Is this a valid pattern for handling errors in a batch of SELECT, INSERT...in SQl SERVER ? (I use v.2008) BEGIN TRANSACTION BEGIN TRY -- statement 1 -- statement 2 -- statement 3 COMMIT TRANSACTION END TRY BEGIN CATCH ROLLBACK TRANSACTION END CATCH Thanks

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