org.apache.mina.handler.chain

接口 IoHandlerCommand

所有已知实现类:

IoHandlerChain

public interface IoHandlerCommand

A IoHandlerCommand encapsulates a unit of processing work to be performed, whose purpose is to examine and/or modify the state of a transaction that is represented by custom attributes provided by IoSession. Individual IoHandlerCommands can be assembled into a IoHandlerChain, which allows them to either complete the required processing or delegate further processing to the next IoHandlerCommand in the IoHandlerChain.

IoHandlerCommand implementations typically retrieve and store state information in the IoSession that is passed as a parameter to the execute(NextCommand,IoSession,Object) method, using custom session attributes. If you think getting attributes is tedious process, you can create a bean which contains getters and setters of all properties and store the bean as a session attribute:

 public class MyContext {
   public String getPropertyX() { ... };
   public void setPropertyX(String propertyX) { ... };
   public int getPropertyZ() { ... };
   public void setPropertyZ(int propertyZ) { ... };
 }
 
 public class MyHandlderCommand implements IoHandlerCommand {
   public void execute( NextCommand next, IoSession session, Object message ) throws Exception {
     MyContext ctx = session.getAttribute( "mycontext" );
     ...
   }
 }
 

版本:

$Rev: 555855 $, $Date: 2007-07-13 12:19:00 +0900 (Fri, 13 Jul 2007) $

作者:

Apache Directory Project

嵌套类概要

嵌套类

限定符和类型	接口和说明
static interface	IoHandlerCommand.NextCommand Represents an indirect reference to the next IoHandlerCommand of the IoHandlerChain.

方法概要

方法

限定符和类型	方法和说明
void	execute(IoHandlerCommand.NextCommand next, IoSession session, java.lang.Object message) Execute a unit of processing work to be performed.

方法详细资料

execute

void execute(IoHandlerCommand.NextCommand next,
           IoSession session,
           java.lang.Object message)
             throws java.lang.Exception

Execute a unit of processing work to be performed. This IoHandlerCommand may either complete the required processing and just return to stop the processing, or delegate remaining processing to the next IoHandlerCommand in a IoHandlerChain containing this IoHandlerCommand by calling IoHandlerCommand.NextCommand.execute(IoSession,Object).

参数:

next - an indirect reference to the next IoHandlerCommand that provides a way to forward the request to the next IoHandlerCommand.

session - the IoSession which is associated with this request

message - the message object of this request

抛出:

java.lang.Exception - general purpose exception return to indicate abnormal termination