net.grinder.communication
Interface MessageDispatchRegistry

All Known Implementing Classes:

MessageDispatchSender

public interface MessageDispatchRegistry

Register of message handlers, keyed by message type.

The current implementation of this interface (MessageDispatchSender) does not interpret the message type polymorphicly. That is, a message is only passed to a handler if the handler was registered for the message's class; handlers registered for super classes are not invoked.

Author:

Philip Aston

Nested Class Summary

static class	MessageDispatchRegistry.AbstractBlockingHandler<T extends Message> Most handlers ignore the shutdown event, so provide this as a convenient base for anonymous classes.
static class	MessageDispatchRegistry.AbstractHandler<T extends Message> Most handlers ignore the shutdown event, so provide this as a convenient base for anonymous classes.
static interface	MessageDispatchRegistry.BlockingHandler<T extends Message> Handler interface.
static interface	MessageDispatchRegistry.Handler<T extends Message> Handler interface.

Method Summary

void	addFallback(MessageDispatchRegistry.Handler<Message> messageHandler) Register a message handler that is called if no other handler or responder is registered for the message type.
<T extends Message,S extends T> MessageDispatchRegistry.BlockingHandler<T>	set(Class<S> messageType, MessageDispatchRegistry.BlockingHandler<T> responder) Register a message responder.
<T extends Message,S extends T> MessageDispatchRegistry.Handler<T>	set(Class<S> messageType, MessageDispatchRegistry.Handler<T> messageHandler) Register a message handler.

Method Detail

set

<T extends Message,S extends T> MessageDispatchRegistry.Handler<T> set(Class<S> messageType,
                                                                       MessageDispatchRegistry.Handler<T> messageHandler)

Register a message handler.

Type Parameters:

S - Class of messageType.

T - Constrains messageHandler to be able to handle messageType.

Parameters:

messageType - Messages of this type will be routed to the handler.

messageHandler - The message handler.

Returns:

The previous message handler registered for messageType or null.

set

<T extends Message,S extends T> MessageDispatchRegistry.BlockingHandler<T> set(Class<S> messageType,
                                                                               MessageDispatchRegistry.BlockingHandler<T> responder)

Register a message responder.

Type Parameters:

S - Class of messageType.

T - Constrains messageHandler to be able to handle messageType.

Parameters:

messageType - Messages of this type will be routed to the handler.

responder - The message responder.

Returns:

The previous message handler registered for messageType or null.

addFallback

void addFallback(MessageDispatchRegistry.Handler<Message> messageHandler)

Register a message handler that is called if no other handler or responder is registered for the message type. There can be multiple such handlers.

Parameters:

messageHandler - The sender.