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## rice.pastry.messaging
Class MessageDispatch

    java.lang.Object
      rice.pastry.messaging.MessageDispatch

public class MessageDispatch
extends java.lang.Object

An object which remembers the mapping from names to MessageReceivers and dispatches messages by request. For consistent routing, modified to only deliver messages to applications if the PastryNode.isReady(). It will still deliver messages to any non-PastryAppl because these "services" may be needed to boot the node into the ring. Any messages to a PastryAppl will be buffered until the node goes ready. TODO: We need to make it explicit which apps can receive messages before PastryNode.isReady().

Version:
  $Id: MessageDispatch.java,v 1.17 2005/06/09 16:48:48 jeffh Exp $
Author:
  Jeff Hoye, Andrew Ladd

Field Summary
`static java.lang.String` | `BUFFER_IF_NOT_READY_PARAM` DESCRIBE THE FIELD
`static java.lang.String` | `BUFFER_SIZE_PARAM` DESCRIBE THE FIELD
`protected PastryNode` | `localNode` DESCRIBE THE FIELD

Constructor Summary
`MessageDispatch(PastryNode pn)` Constructor.

Method Summary
`void` | `deliverAllBufferedMessages()` Called when PastryNode.isReady() becomes true.
`protected void` | `deliverBuffered(Address address)` Deliveres all buffered messages for the address.
`boolean` | `dispatchMessage(Message msg)` Dispatches a message to the appropriate receiver.
`MessageReceiver` | `getDestination(Message msg)` Gets the Destination attribute of the MessageDispatch object
`MessageReceiver` | `getDestinationByAddress(Address addr)` Gets the DestinationByAddress attribute of the MessageDispatch object
`void` | `registerReceiver(Address address, MessageReceiver receiver)` Registers a receiver with the mail service.

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

Field Detail

### localNode

    protected PastryNode localNode

  DESCRIBE THE FIELD

### BUFFER_IF_NOT_READY_PARAM

    public static final java.lang.String BUFFER_IF_NOT_READY_PARAM

  DESCRIBE THE FIELD

  See Also:
    Constant Field Values

### BUFFER_SIZE_PARAM

    public static final java.lang.String BUFFER_SIZE_PARAM

  DESCRIBE THE FIELD

  See Also:
    Constant Field Values

Constructor Detail

### MessageDispatch

    public MessageDispatch(PastryNode pn)

  Constructor.

Parameters:
  `pn` - DESCRIBE THE PARAMETER

Method Detail

### getDestination

    public MessageReceiver getDestination(Message msg)

  Gets the Destination attribute of the MessageDispatch object

  Parameters:
    `msg` - DESCRIBE THE PARAMETER
  Returns:
    The Destination value

### getDestinationByAddress

    public MessageReceiver getDestinationByAddress(Address addr)

  Gets the DestinationByAddress attribute of the MessageDispatch object

  Parameters:
    `addr` - DESCRIBE THE PARAMETER
  Returns:
    The DestinationByAddress value

### registerReceiver

    public void registerReceiver(Address address,
                                 MessageReceiver receiver)

  Registers a receiver with the mail service.

  Parameters:
    `receiver` - the receiver.
    `address` - DESCRIBE THE PARAMETER

### dispatchMessage

    public boolean dispatchMessage(Message msg)

  Dispatches a message to the appropriate receiver. It will buffer the message under the following conditions: 1) The MessageReceiver is not yet registered. 2) The MessageReceiver is a PastryAppl, and localNode.isReady() == false

  Parameters:
    `msg` - the message.
  Returns:
    true if message could be dispatched, false otherwise.

### deliverBuffered

    protected void deliverBuffered(Address address)

  Deliveres all buffered messages for the address. Unless: 1) The MR for the address is still null. 2) The MR is a PastryAppl and localNode.isReady() == false

  Parameters:
    `address` -

### deliverAllBufferedMessages

    public void deliverAllBufferedMessages()

  Called when PastryNode.isReady() becomes true. Delivers all buffered messages.

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