rice.p2p.past.messaging
Class PastMessage

java.lang.Object
  rice.p2p.past.messaging.PastMessage

All Implemented Interfaces:

java.io.Serializable, Message

Direct Known Subclasses:

CacheMessage, ContinuationMessage, GCCollectMessage, MessageLostMessage

public abstract class PastMessage

extends java.lang.Object

implements Message

Version:

$Id: PastMessage.java 2574 2005-06-14 17:38:04Z jeffh $

Author:

Alan Mislove, Ansley Post, Peter Druschel

See Also:

Serialized Form

Field Summary

protected Id	dest
protected int	id
protected boolean	isResponse
protected NodeHandle	source

Fields inherited from interface rice.p2p.commonapi.Message

HIGH_PRIORITY, LOW_PRIORITY, MEDIUM_HIGH_PRIORITY, MEDIUM_LOW_PRIORITY, MEDIUM_PRIORITY

Constructor Summary

protected

PastMessage(int id, NodeHandle source, Id dest) Constructor which takes a unique integer Id

Method Summary

void	addHop(NodeHandle handle) Method which is designed to be overridden by subclasses if they need to keep track of where they've been.
Id	getDestination() Method which returns this messages' destination address
int	getPriority() Method which should return the priority level of this message.
NodeHandle	getSource() Method which returns this messages' source address
int	getUID() Method which returns this messages' unique id
boolean	isResponse() Method which returns whether or not this message is a response.
abstract void	returnResponse(Continuation c, Environment env, java.lang.String instance) Method by which this message is supposed to return it's response.
protected void	setResponse() Method which builds a response for this message, using the provided object as a result.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

id

protected int id

source

protected NodeHandle source

dest

protected Id dest

isResponse

protected boolean isResponse

Constructor Detail

PastMessage

protected PastMessage(int id,
                      NodeHandle source,
                      Id dest)

Constructor which takes a unique integer Id

Parameters:

id - The unique id

source - The source address

dest - The destination address

Method Detail

getPriority

public int getPriority()

Method which should return the priority level of this message. The messages can range in priority from 0 (highest priority) to Integer.MAX_VALUE (lowest) - when sending messages across the wire, the queue is sorted by message priority. If the queue reaches its limit, the lowest priority messages are discarded. Thus, applications which are very verbose should have LOW_PRIORITY or lower, and applications which are somewhat quiet are allowed to have MEDIUM_PRIORITY or possibly even HIGH_PRIORITY.

Specified by:

getPriority in interface Message

Returns:

This message's priority

getUID

public int getUID()

Method which returns this messages' unique id

Returns:

The id of this message

getSource

public NodeHandle getSource()

Method which returns this messages' source address

Returns:

The source of this message

getDestination

public Id getDestination()

Method which returns this messages' destination address

Returns:

The dest of this message

setResponse

protected void setResponse()

Method which builds a response for this message, using the provided object as a result. Should be overriden by subclasses, but with the super.setResponse() called.

isResponse

public boolean isResponse()

Method which returns whether or not this message is a response.

Returns:

whether or not this message is a response.

returnResponse

public abstract void returnResponse(Continuation c,
                                    Environment env,
                                    java.lang.String instance)

Method by which this message is supposed to return it's response.

Parameters:

c - The continuation to return the reponse to.

addHop

public void addHop(NodeHandle handle)

Method which is designed to be overridden by subclasses if they need to keep track of where they've been.

Parameters:

handle - The current local handle