Patterns in SOME –Chain Of Responsibility
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Code in C#:
namespace ChainOfResponsibility_DesignPattern
{
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 == 1) // 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 == 2) // 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 == 3) // 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(2,"This are the request parameters");
firstHandler.HandleRequest(newRequest);
return 0;
}
}
}
Code in SOME:
AHandler ->AHandler[m_successorHandler]
a_HandleCRequest(CRequest )
SetSuccessor(AHandler m_successorHandler)
CConcreteHandler1 : AHandler
o_HandleCRequest(CRequest)
CConcreteHandler2 : AHandler
o_HandleCRequest(CRequest)
CConcreteHandler3 : AHandler
o_HandleCRequest(CRequest)
CRequest
(int _iCRequestType, string _strCRequestParameters) //include defination of 2 private members
CClient
main
CClient.main
{
// Set up chain (usually one need to be done once)
AHandler firstHandler<CConcreteHandler1>.();
AHandler secondHandler<CConcreteHandler2>.();
AHandler thirdHandler<CConcreteHandler3>.();
firstHandler.SetSuccessor(m_successorHandler = secondHandler);
secondHandler.SetSuccessor(m_successorHandler = thirdHandler);
// generate and fire CRequest
CRequest newCRequest.(2,"This are the CRequest parameters");
firstHandler.HandleCRequest<CConcreteHandler1>(CRequest[newCRequest]) //alias of newCRequest
{
<%
// determine if we can handle the CRequest
if (CRequest.CRequestType == 1) // some complex decision making!
{
// CRequest handling code goes here
Console.WriteLine("CRequest handled in ConcreteHandler1");
}
else
{
// not handled here - pass on to next in the chain
if (m_successorHandler != null)
%>
m_successorHandler.HandleCRequest<CConcreteHandler2>(CRequest)
{
<%
// determine if we can handle the CRequest
if (CRequest.CRequestType == 2) // some complex decision making!
{
// CRequest handling code goes here
Console.WriteLine("CRequest handled in ConcreteHandler2");
}
else
{
// not handled here - pass on to next in the chain
if (m_successorHandler != null)
%>
m_successorHandler.HandleCRequest<CConcreteHandler3>(CRequest)
{
<%
// determine if we can handle the CRequest
if (CRequest.CRequestType == 3) // some complex decision making!
{
// CRequest handling code goes here
Console.WriteLine("CRequest handled in ConcreteHandler3");
}
else
{
// not handled here - pass on to next in the chain
if (m_successorHandler != null)
m_successorHandler.HandleCRequest(CRequest);
}
%>
};
<%}%>
};
<%}%>
};
}
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