MessageBus

java.lang.Object
- org.apache.pivot.util.MessageBus

```
public final class MessageBus
extends java.lang.Object
```
Provides support for basic intra-application message passing.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static <T> void`	`sendMessage(T message)`	Sends a message to subscribed topic listeners.
`static <T> void`	`subscribe(java.lang.Class<? super T> topic, MessageBusListener<T> messageListener)`	Subscribes a listener to a message topic.
`static <T> void`	`unsubscribe(java.lang.Class<? super T> topic, MessageBusListener<T> messageListener)`	Unsubscribe a listener from a message topic.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - subscribe
```
public static <T> void subscribe(java.lang.Class<? super T> topic,
                                 MessageBusListener<T> messageListener)
```
    Subscribes a listener to a message topic.
    
    Type Parameters:
    
    T - The type of the topic.
    
    Parameters:
    
    topic - The topic class to subscribe to.
    
    messageListener - The listener we want to attach.
  - unsubscribe
```
public static <T> void unsubscribe(java.lang.Class<? super T> topic,
                                   MessageBusListener<T> messageListener)
```
    Unsubscribe a listener from a message topic.
    
    Type Parameters:
    
    T - The type of the topic.
    
    Parameters:
    
    topic - The topic class to subscribe to.
    
    messageListener - The listener to unsubscribe.
    
    Throws:
    
    java.lang.IllegalArgumentException - if there are no listeners subscribed.
  - sendMessage
```
public static <T> void sendMessage(T message)
```
    Sends a message to subscribed topic listeners.
    
    Type Parameters:
    
    T - The type of the topic.
    
    Parameters:
    
    message - The message to send to all subscribed listeners.