Package it.tidalwave.messagebus

Interface MessageBus

All Known Implementing Classes:

SimpleMessageBus

public interface MessageBus

A simple message bus for a local publish/subscribe facility.

Author:

Fabrizio Giudici

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	MessageBus.Listener<TOPIC>	A listener to receive notifications from a MessageBus.

Method Summary

Modifier and Type	Method	Description
<TOPIC> void	publish(java.lang.Class<TOPIC> topic, TOPIC message)	Publishes the given message and topic.
<TOPIC> void	publish(TOPIC message)	Publishes the given event.
<TOPIC> void	subscribe(java.lang.Class<TOPIC> topic, MessageBus.Listener<TOPIC> listener)	Subscribes a MessageBus.Listener to a topic.
void	unsubscribe(MessageBus.Listener<?> listener)	Unsubscribes a MessageBus.Listener.

Method Detail

publish

<TOPIC> void publish(@Nonnull
                     TOPIC message)

Publishes the given event. The topic is the class of the event.

Type Parameters:

TOPIC - the static type of the topic

Parameters:

message - the event

publish

<TOPIC> void publish(@Nonnull
                     java.lang.Class<TOPIC> topic,
                     @Nonnull
                     TOPIC message)

Publishes the given message and topic. Passing an explicit topic can be useful when dealing with a hierarchy of events (so, perhaps a subclass is passed but the topic is the root of the hierarchy).

Type Parameters:

TOPIC - the static type of the topic

Parameters:

topic - the topic

message - the message

subscribe

<TOPIC> void subscribe(@Nonnull
                       java.lang.Class<TOPIC> topic,
                       @Nonnull
                       MessageBus.Listener<TOPIC> listener)

Subscribes a MessageBus.Listener to a topic.

Type Parameters:

TOPIC - the static type of the topic

Parameters:

topic - the topic

listener - the listener

unsubscribe

void unsubscribe(@Nonnull
                 MessageBus.Listener<?> listener)

Unsubscribes a MessageBus.Listener.

Parameters:

listener - the listener