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javadesign-patternsfactorychain-of-responsibility
Noor
Noor

Reputation: 20150

Chain of Responsibility design pattern confusion

I understand the concept of Chain of Responsibility Pattern but maybe I'm wrongly using it.

I have several types of product and I have a controller that controls the interface that is displayed for each of these types of product. The user selects the type of product and each controller is responsible for showing and interacting with the appropriate interface.

For this, I'm using the chain of responsibility pattern which doesn't sound okay I think. What I'm doing is creating a chain of controllers and, as soon as I get the product type request, I just pass it to the chain of controllers and let the appropriate controller implement the request.

But when thinking, the same could have been achieved using a simple factory but with many conditional statements.

What do you think about the use of chain of responsibility in this situation?

Upvotes: 4

Views: 2282

Answers (1)

FireAlkazar
FireAlkazar

Reputation: 1882

As for me this task is defenitely not for chain of responsibility.
Usually in chain of responsibility the order of chain elements matters and here it is not the case.

I would try to do the following.
Create some kind of registry, which contains a map with key for productType and value for controller.

Sample implementation:

class ControllerRegistry
{
  //declaration for map and constructor

  public void Register(string productType, IProductController controller)
  {
    _map.Add(productType, controller);
  }

  public IProductController Find(string productType)
  {
    return _map[productType];
  }
}

And during application startup you should register all you controllers by calling ControllerRegistry.Register method.
You get appropriate controller by calling ControllerRegistry.Find method.
As compared with chain of responsibility you will avoid the performanse hit if number of product types is large.

EDIT
Same task topic Design pattern for handling multiple message types

Upvotes: 2

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