MessageListener

All Known Subinterfaces:

ExtendedMessageListener, ExtendedReceiver, Receiver

All Known Implementing Classes:

Chat, ChatCore, DistributedHashtable, DistributedQueue, DistributedTree, Draw, ExtendedReceiverAdapter, MessageListenerAdapter, NotificationBus, QuoteServer, ReceiverAdapter, ReplicatedHashMap, ReplicatedHashtable, ReplicatedTree, ViewDemo, VotingAdapter, Whiteboard
```
public interface MessageListener
```
Allows a listener to be notified when a message arrives. Contrary to the pull-style of channels, some building blocks (e.g., PullPushAdapter) provide an event-like, push-style message delivery model. In this case, the entity to be notified of message reception needs to provide a callback to be invoked whenever a message has been received. The MessageListener interface provides a method to do so.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`byte[]`	`getState()`	Answers the group state; e.g., when joining.
`void`	`receive(Message msg)`	Called when a message is received.
`void`	`setState(byte[] state)`	Sets the group state; e.g., when joining.

- Method Detail
  - receive
```
void receive(Message msg)
```
    Called when a message is received.
    
    Parameters:
    
    msg -
  - getState
```
byte[] getState()
```
    Answers the group state; e.g., when joining.
    
    Returns:
    
    byte[]
  - setState
```
void setState(byte[] state)
```
    Sets the group state; e.g., when joining.
    
    Parameters:
    
    state -