行为型设计模式之职责链模式(Chain of Responsibility)
2024-10-21 09:57:14
| 结构 |  |
| 意图 | 使多个对象都有机会处理请求，从而避免请求的发送者和接收者之间的耦合关系。将这些对象连成一条链，并沿着这条链传递该请求，直到有一个对象处理它为止。 |
| 适用性 |
|
using System;
abstract class Handler
{
protected Handler successorHandler;
abstract public void HandleRequest(Request request);
public void SetSuccessor(Handler sucessor)
{
successorHandler = sucessor;
}
}
class ConcreteHandler1 : Handler
{
override public void HandleRequest(Request request)
{
// determine if we can handle the request
if (request.RequestType == ) // some complex decision making!
{
// request handling code goes here
Console.WriteLine("request handled in ConcreteHandler1");
}
else
{
// not handled here - pass on to next in the chain
if (successorHandler != null)
successorHandler.HandleRequest(request);
}
}
}
class ConcreteHandler2 : Handler
{
override public void HandleRequest(Request request)
{
// determine if we can handle the request
if (request.RequestType == ) // some complex decision making!
{
// request handling code goes here
Console.WriteLine("request handled in ConcreteHandler2");
}
else
{
// not handled here - pass on to next in the chain
if (successorHandler != null)
successorHandler.HandleRequest(request);
}
}
}
class ConcreteHandler3 : Handler
{
override public void HandleRequest(Request request)
{
// determine if we can handle the request
if (request.RequestType == ) // some complex decision making!
{
// request handling code goes here
Console.WriteLine("request handled in ConcreteHandler3");
}
else
{
// not handled here - pass on to next in the chain
if (successorHandler != null)
successorHandler.HandleRequest(request);
}
}
}
class Request
{
private int iRequestType;
private string strRequestParameters;
public Request(int requestType, string requestParameters)
{
iRequestType = requestType;
strRequestParameters = requestParameters;
}
public int RequestType
{
get
{
return iRequestType;
}
set
{
iRequestType = value;
}
}
}
/// <summary>
/// Summary description for Client.
/// </summary>
public class Client
{
public static int Main(string[] args)
{
// Set up chain (usually one need to be done once)
Handler firstHandler = new ConcreteHandler1();
Handler secondHandler = new ConcreteHandler2();
Handler thirdHandler = new ConcreteHandler3();
firstHandler.SetSuccessor(secondHandler);
secondHandler.SetSuccessor(thirdHandler);
// After setting up the chain of responsibility, we can
// now generate requests and pass then off to the
// chain to be handled
// generate and fire request
Request newRequest = new Request(,"This are the request parameters");
firstHandler.HandleRequest(newRequest);
return ;
}
}
职责链模式
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