Hi, I'm working on an application that has a large domain - i.e. Customers, SalesOrder, Suppliers, Products, Stocks etc. - and have discovered that the WinForms data binding is a little too restrictive for what I need. Is there a useful design pattern for setting up the populating of forms and updating of the underlying data? Thanks ...
Hi From where I can get link to connector acceptor pattern explained simple ,and also a sample code . The one I get http://www.cs.wustl.edu/~schmidt/PDF/Acc-Con.pdf , I find difficult to understand. ...
I have an interface -- "EventHandler" -- that declares several methods. public interface EventHandler { void handleEvent1(); void handleEvent2(); void handleEvent3(); void handleEvent4(); } I also have a class -- "EventHandlerAdapter" -- that implements EventHandler. However, it doesn't actually "implement" anything...
I am investigating using JPA for my Data Access code. I am trying to write the business layer and data access layer so it will work in a web application and a Java SE application. Therefore I cannot use container managed persistence context. Most of my seraches on using JPA show examples in a container managed enviroment. At the mome...
Hello I have a application design problem and I home you can help me solve it.... This is my first application in silverlight and the first application using mvvm design pattern and I am not sure I am applying mvvm how I am supposed to.. The application is a dynamic application and at runtime I can add/remove usercontrols... So I have ...
Hi, Can we inherit singleton class? ...
Is it wrong to call a class a FooFactory if it doesn't always create Foo objects? For example if I have the following interface: public interface IFooFactory { Foo Create(); } and implement it as follows: public class FooFactory : IFooFactory { public IFoo Create() { return ServiceLocator.Current.GetInstance<IFoo>...
I wonder if there are cheat cheets for all design patterns implemented in Ruby so that you don't have to reinvent the wheel. ...
Usually I start with pure model objects, usually in a tree structure. Depending upon the application, I will end up adding functionality to the model heirarchy, such as attaching UI controls and other data depending upon the application. Usually I'll do this by walking through the heirarchy and placing additional functionality on the ...
I am developing a framework. And I have confronted with some difficulties. For Database I have created Abstract class, Interface and some Adapters for different SCDB. For example, Mysqli adapter has the constructor, which call the constructor of parent with settings array as parameter. Mysqli class uses the next scheme: class Hybrid_Db_...
Hi Guys, I'm doing some R&D work, and as such am exploring design patterns. I have recently been reading up on the Specification pattern and was referred to this great article. I was intrigued by the simplicity and cleanliness of the code, but i started to draw some comparisons to implementing the same cleanliness using other techniq...
I have a request that contains a batch of "tasks" that need to be completed. An "asyncstate" object that gets passed around via both the request/response contains a collection of "PendingTasks" and "CompletedTasks". Once a task has been complete by a request handler, it gets moved into a "CompletedTasks" collection. If the original re...
I wonder if there are Ruby snippets for various design patterns you can use in Ruby. Examples: Builder method Declare ghost methods Using blocks for DSLs (like Rails) So that one doesn't have to reinvent the wheel. Im not talking about books, but a collection of ruby snippets for various practical things, nothing abstract and gener...
If you have two repositories dealing with persistance to a relational DB, a personrepository that deals with "Person" objects, and an addressrepository which deals with "Address" objects, and a person object has a collection of addresses (probably lazy loaded). Obviously the personrepository would be used to persist changes to the person...
It's not too pricey and I want to learn more about design patterns. Is this a decent product or is my money better spent somewhere else? One advantage, potentially anyway, is it appears to be a good-sized chunk of content and usable offline, unlike Google or Wikipedia. ...
I'm struggling with a design problem and I don't want my code to become a mess because of a bad solution. Rather than give a poor analogy I'll just explain my exact case. I'm trying to write a clone of Wii Play Tanks, and I'm having trouble designing the Tank classes. Tank itself is the only such class, it uses dependency injection for ...
I have a System class that can return a pointer to an Editor class. The Editor class is instantiated within the System class and passed pointers to System's private variables. The Editor class essentially acts as an alternative interface to System's internal data structures. My question: Does a design pattern exist that allows me to pr...
A car entertainment system can only be controlled by a remote controller. The remote controller has up/down buttons for scrolling media files. The functionalities of these buttons are given below a. If the user releases the up or down button 1500 ms after (before 2000 ms) pressing it, the selection goes up or down respectively. b. if th...
If we want to refactor an enum (contained in the domain layer) to a polymorphic class, using "simple" abstract methods could be a bad idea, if all the switch and if statements we want to refactor are inside the other layers (like the business or the presentation layer), because we could end up to reference these layers inside the domain ...
I have a situation where I need to create a 'master object' instance by which all others will inherit from, in a project that uses the Entity Framework (4.0). I could just set up this object, and add a record to the database for it, and everything pull from that. But that seems ...like a real waste. An entire table, for one record? Th...