rice.pastry.direct
Class DirectNodeHandle

java.lang.Object
  java.util.Observable
      rice.p2p.commonapi.NodeHandle
          rice.pastry.NodeHandle
              rice.pastry.direct.DirectNodeHandle

All Implemented Interfaces:

java.io.Serializable, java.util.Observer

public class DirectNodeHandle
extends NodeHandle
implements java.util.Observer

the node handle used with the direct network

Version:

$Id: DirectNodeHandle.java 3524 2007-01-09 14:09:27Z jeffh $

Author:

Andrew Ladd, Rongmei Zhang/Y. Charlie Hu

See Also:

Serialized Form

Field Summary

NetworkSimulator

simulator

Fields inherited from class rice.pastry.NodeHandle

LIVENESS_ALIVE, LIVENESS_DEAD, LIVENESS_SUSPECTED, localnode, logger

Fields inherited from class rice.p2p.commonapi.NodeHandle

DECLARED_DEAD, DECLARED_LIVE, PROXIMITY_CHANGED

Method Summary

void	assertLocalNode() May be called from handle etc methods to ensure that local node has been set, either on construction or on deserialization/receivemsg.
boolean	equals(java.lang.Object obj) Equivalence relation for nodehandles.
int	getLiveness() Gets the Alive attribute of the DirectNodeHandle object
Id	getNodeId() Gets the NodeId attribute of the DirectNodeHandle object
DirectPastryNode	getRemote() Gets the Remote attribute of the DirectNodeHandle object
NetworkSimulator	getSimulator() Gets the Simulator attribute of the DirectNodeHandle object
int	hashCode() Hash codes for node handles.It is the hashcode of their corresponding NodeId's.
void	notifyObservers(java.lang.Object arg) DESCRIBE THE METHOD
boolean	ping() DESCRIBE THE METHOD
int	proximity() Deprecated.
void	receiveMessage(Message msg) Deprecated. use PastryNode.send()
void	serialize(OutputBuffer buf)
java.lang.String	toString() DESCRIBE THE METHOD
void	update(java.util.Observable arg0, java.lang.Object arg1) Only notify if dead.

Methods inherited from class rice.pastry.NodeHandle

addObserver, addObserver, bootstrap, checkLiveness, countObservers, deleteObserver, deleteObservers, getId, getLocalNode, isAlive, update

Methods inherited from class java.util.Observable

clearChanged, hasChanged, notifyObservers, setChanged

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

simulator

public transient NetworkSimulator simulator

Method Detail

getRemote

public DirectPastryNode getRemote()

Gets the Remote attribute of the DirectNodeHandle object

Returns:

The Remote value

getNodeId

public Id getNodeId()

Gets the NodeId attribute of the DirectNodeHandle object

Specified by:

getNodeId in class NodeHandle

Returns:

The NodeId value

getLiveness

public int getLiveness()

Gets the Alive attribute of the DirectNodeHandle object

Specified by:

getLiveness in class NodeHandle

Returns:

The Alive value

getSimulator

public NetworkSimulator getSimulator()

Gets the Simulator attribute of the DirectNodeHandle object

Returns:

The Simulator value

notifyObservers

public void notifyObservers(java.lang.Object arg)

DESCRIBE THE METHOD

Overrides:

notifyObservers in class NodeHandle

Parameters:

arg - DESCRIBE THE PARAMETER

ping

public boolean ping()

DESCRIBE THE METHOD

Specified by:

ping in class NodeHandle

Returns:

DESCRIBE THE RETURN VALUE

assertLocalNode

public final void assertLocalNode()

Description copied from class: NodeHandle

May be called from handle etc methods to ensure that local node has been set, either on construction or on deserialization/receivemsg.

Overrides:

assertLocalNode in class NodeHandle

proximity

public int proximity()

Deprecated.

DESCRIBE THE METHOD

Specified by:

proximity in class NodeHandle

Returns:

DESCRIBE THE RETURN VALUE

receiveMessage

public void receiveMessage(Message msg)

Deprecated. use PastryNode.send()

DESCRIBE THE METHOD

Specified by:

receiveMessage in class NodeHandle

Parameters:

msg - DESCRIBE THE PARAMETER

equals

public boolean equals(java.lang.Object obj)

Equivalence relation for nodehandles. They are equal if and only if their corresponding NodeIds are equal.

Specified by:

equals in class NodeHandle

Parameters:

obj - the other nodehandle .

Returns:

true if they are equal, false otherwise.

hashCode

public int hashCode()

Hash codes for node handles.It is the hashcode of their corresponding NodeId's.

Specified by:

hashCode in class NodeHandle

Returns:

a hash code.

toString

public java.lang.String toString()

DESCRIBE THE METHOD

Overrides:

toString in class java.lang.Object

Returns:

DESCRIBE THE RETURN VALUE

update

public void update(java.util.Observable arg0,
                   java.lang.Object arg1)

Only notify if dead. Note that this is limitied in that it's not possible to simulate a byzantine failure of a node. But that's out of the scope of the simulator. If we leave in the first arg, the node notifies DECLARED_LIVE way too often.

Specified by:

update in interface java.util.Observer

serialize

public void serialize(OutputBuffer buf)
               throws java.io.IOException

Specified by:

serialize in class NodeHandle

Throws:

java.io.IOException