org.apache.mina.handler.chain
Interface IoHandlerCommand
- 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
IoHandlerCommand
s 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(IoHandlerCommand.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" );
...
}
}