rice.p2p.commonapi
Class NodeHandle

java.lang.Object
  java.util.Observable
      rice.p2p.commonapi.NodeHandle

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

MultiringNodeHandle, NodeHandle

public abstract class NodeHandle

extends java.util.Observable

implements java.io.Serializable

Version:

$Id: NodeHandle.java 2302 2005-03-11 00:58:26Z jeffh $

Author:

Alan Mislove, Peter Druschel

See Also:

Serialized Form

Field Summary

static java.lang.Integer	DECLARED_DEAD
static java.lang.Integer	DECLARED_LIVE
static java.lang.Integer	PROXIMITY_CHANGED

Constructor Summary

NodeHandle()

Method Summary

abstract boolean	checkLiveness() Requests that the underlying transport layer check to ensure that the remote node is live.
abstract Id	getId() Returns this node's id.
abstract boolean	isAlive() Returns whether or not this node is currently alive
abstract int	proximity() Returns the current proximity value of this node

Methods inherited from class java.util.Observable

addObserver, clearChanged, countObservers, deleteObserver, deleteObservers, hasChanged, notifyObservers, notifyObservers, setChanged

Methods inherited from class java.lang.Object

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

Field Detail

PROXIMITY_CHANGED

public static final java.lang.Integer PROXIMITY_CHANGED

DECLARED_DEAD

public static final java.lang.Integer DECLARED_DEAD

DECLARED_LIVE

public static final java.lang.Integer DECLARED_LIVE

Constructor Detail

NodeHandle

public NodeHandle()

Method Detail

getId

public abstract Id getId()

Returns this node's id.

Returns:

The corresponding node's id.

isAlive

public abstract boolean isAlive()

Returns whether or not this node is currently alive

Returns:

Whether or not this node is currently alive

proximity

public abstract int proximity()

Returns the current proximity value of this node

Returns:

The current proximity value of this node

checkLiveness

public abstract boolean checkLiveness()

Requests that the underlying transport layer check to ensure that the remote node is live. If the node is found to be live, nothing happens, but if the node does not respond, the transport layer make take steps to verfify that the node is dead. Such steps could include finding an alteranate route to the node.

Returns:

Whether or not the node is currently alive