rice.pastry.socket
Class SocketNodeHandle

java.lang.Object
  java.util.Observable
      rice.p2p.commonapi.NodeHandle
          rice.pastry.NodeHandle
              rice.pastry.dist.DistNodeHandle
                  rice.pastry.socket.SocketNodeHandle

All Implemented Interfaces:

LocalNodeI, MessageReceiver, java.util.Observer, java.io.Serializable

public class SocketNodeHandle

extends DistNodeHandle

Class which represents the address and nodeId of a remote node. In the socket protocol, it simply represents this information - all other details are managed by the local nodes.

Version:

$Id: SocketNodeHandle.java,v 1.28 2005/06/07 22:02:11 jeffh Exp $

Author:

Alan Mislove

See Also:

Serialized Form

Field Summary

static int	DEFAULT_PROXIMITY DESCRIBE THE FIELD
protected EpochInetSocketAddress	eaddress DESCRIBE THE FIELD
static int	LIVENESS_DEAD_FOREVER DESCRIBE THE FIELD

Fields inherited from class rice.pastry.dist.DistNodeHandle

address, epoch, nodeId

Fields inherited from class rice.pastry.NodeHandle

LIVENESS_ALIVE, LIVENESS_DEAD, LIVENESS_SUSPECTED, localnode

Fields inherited from class rice.p2p.commonapi.NodeHandle

DECLARED_DEAD, DECLARED_LIVE, PROXIMITY_CHANGED

Constructor Summary

SocketNodeHandle(EpochInetSocketAddress address, NodeId nodeId)
Constructor

Method Summary

void	afterSetLocalNode() Method which registers this handle with the node that it is currently on.
void	bootstrap(Message msg) Method which is used by Pastry to start the bootstrapping process on the local node using this handle as the bootstrap handle.
boolean	checkLiveness() Method which FORCES a check of liveness of the remote node.
boolean	equals(java.lang.Object obj) Equivalence relation for nodehandles.
EpochInetSocketAddress	getEpochAddress() Gets the EpochAddress attribute of the SocketNodeHandle object
int	getLiveness() Returns the last known liveness information about the Pastry node associated with this handle.
int	hashCode() Hash codes for node handles.
boolean	isLocal() Method which returns whether or not this node handle is on its home node.
boolean	ping() Ping the node.
int	proximity() Returns the last known proximity information about the Pastry node associated with this handle.
void	receiveMessage(Message msg) Called to send a message to the node corresponding to this handle.
java.lang.String	toString() Returns a String representation of this DistNodeHandle.
protected void	update(java.lang.Object update) Method which allows the observers of this socket node handle to be updated.
void	update(java.util.Observable o, java.lang.Object obj) DESCRIBE THE METHOD

Methods inherited from class rice.pastry.dist.DistNodeHandle

getAddress, getEpoch, getNodeId

Methods inherited from class rice.pastry.NodeHandle

assertLocalNode, getId, getLocalNode, isAlive, setLocalNode

Methods inherited from class java.util.Observable

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

Methods inherited from class java.lang.Object

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

Field Detail

eaddress

protected EpochInetSocketAddress eaddress

DESCRIBE THE FIELD

LIVENESS_DEAD_FOREVER

public static final int LIVENESS_DEAD_FOREVER

DESCRIBE THE FIELD

See Also:

Constant Field Values

DEFAULT_PROXIMITY

public static int DEFAULT_PROXIMITY

DESCRIBE THE FIELD

Constructor Detail

SocketNodeHandle

public SocketNodeHandle(EpochInetSocketAddress address,
                        NodeId nodeId)

Constructor

Parameters:

nodeId - This node handle's node Id.

address - DESCRIBE THE PARAMETER

Method Detail

getEpochAddress

public EpochInetSocketAddress getEpochAddress()

Gets the EpochAddress attribute of the SocketNodeHandle object

Returns:

The EpochAddress value

getLiveness

public int getLiveness()

Returns the last known liveness information about the Pastry node associated with this handle. Invoking this method does not cause network activity.

Specified by:

getLiveness in class NodeHandle

Returns:

true if the node is alive, false otherwise.

isLocal

public boolean isLocal()

Method which returns whether or not this node handle is on its home node.

Returns:

Whether or not this handle is local

checkLiveness

public boolean checkLiveness()

Method which FORCES a check of liveness of the remote node. Note that this method should ONLY be called by internal Pastry maintenance algorithms - this is NOT to be used by applications. Doing so will likely cause a blowup of liveness traffic.

Overrides:

checkLiveness in class NodeHandle

Returns:

true if node is currently alive.

receiveMessage

public void receiveMessage(Message msg)

Called to send a message to the node corresponding to this handle.

Parameters:

msg - Message to be delivered, may or may not be routeMessage.

bootstrap

public void bootstrap(Message msg)

Method which is used by Pastry to start the bootstrapping process on the local node using this handle as the bootstrap handle. Default behavior is simply to call receiveMessage(msg), but transport layer implementations may care to perform other tasks by overriding this method, since the node is not technically part of the ring yet.

Overrides:

bootstrap in class NodeHandle

Parameters:

msg - the bootstrap message.

toString

public java.lang.String toString()

Returns a String representation of this DistNodeHandle. This method is designed to be called by clients using the node handle, and is provided in order to ensure that the right node handle is being talked to.

Specified by:

toString in class DistNodeHandle

Returns:

A String representation of the node handle.

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 DistNodeHandle

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 DistNodeHandle

Returns:

a hash code.

proximity

public int proximity()

Returns the last known proximity information about the Pastry node associated with this handle. Invoking this method does not cause network activity. Smaller values imply greater proximity. The exact nature and interpretation of the proximity metric implementation-specific.

Specified by:

proximity in class NodeHandle

Returns:

the proximity metric value

ping

public boolean ping()

Ping the node. Refreshes the cached liveness status and proximity value of the Pastry node associated with this. Invoking this method causes network activity.

Specified by:

ping in class NodeHandle

Returns:

true if node is currently alive.

afterSetLocalNode

public void afterSetLocalNode()

Method which registers this handle with the node that it is currently on.

Overrides:

afterSetLocalNode in class NodeHandle

update

public void update(java.util.Observable o,
                   java.lang.Object obj)

DESCRIBE THE METHOD

Parameters:

o - DESCRIBE THE PARAMETER

obj - DESCRIBE THE PARAMETER

update

protected void update(java.lang.Object update)

Method which allows the observers of this socket node handle to be updated. This method sets this object as changed, and then sends out the update.

Parameters:

update - The update