net.jxta.impl.rendezvous.edge
Class EdgePeerRdvService

java.lang.Object
  net.jxta.impl.rendezvous.RendezVousServiceProvider
      net.jxta.impl.rendezvous.StdRendezVousService
          net.jxta.impl.rendezvous.edge.EdgePeerRdvService

All Implemented Interfaces:

EventListener, EndpointListener, PeerViewListener

public class EdgePeerRdvService
extends StdRendezVousService
implements PeerViewListener

A JXTA RendezvousService implementation which implements the client portion of the standard JXTA Rendezvous Protocol (RVP).

See Also:

RendezvousService, JXTA Protocols Specification : Rendezvous Protocol

EdgePeerRdvService

public EdgePeerRdvService(PeerGroup group,
                          RendezVousServiceImpl rdvService)

Constructor

Parameters:

g - Description of Parameter

sadv - Description of Parameter

startApp

protected int startApp(String[] arg)

Supply arguments and starts this service if it hadn't started by itself.

Currently this service starts by itself and does not expect arguments.

Overrides:

startApp in class RendezVousServiceProvider

stopApp

protected void stopApp()

Ask this service to stop.

Overrides:

stopApp in class StdRendezVousService

getConnectedPeerIDs

public Vector getConnectedPeerIDs()

Specified by:

getConnectedPeerIDs in class RendezVousServiceProvider

getConnectedPeers

public Enumeration getConnectedPeers()

Specified by:

getConnectedPeers in class RendezVousServiceProvider

isConnectedToRendezVous

public boolean isConnectedToRendezVous()

Return true if connected to a rendezvous.

Specified by:

isConnectedToRendezVous in class RendezVousServiceProvider

Returns:

true if connected to a rendezvous, false otherwise

getConnectedRendezVous

public Enumeration getConnectedRendezVous()

Returns an Enumeration of the PeerID all the RendezVous on which this Peer is currentely connected.

Specified by:

getConnectedRendezVous in class RendezVousServiceProvider

Returns:

Enumeration enumeration of RendezVous

getDisconnectedRendezVous

public Enumeration getDisconnectedRendezVous()

Returns an Enumeration of the PeerID all the RendezVous on which this Peer failed to connect to.

Specified by:

getDisconnectedRendezVous in class RendezVousServiceProvider

Returns:

Enumeration enumeration of RendezVous

challengeRendezVous

public void challengeRendezVous(ID peerid,
                                long delay)

Resets the local idea of the lease to the specified value. As a result a lease reponse must be sought and obtained within the new specified delay or the rdv is considered disconnected.

Specified by:

challengeRendezVous in class RendezVousServiceProvider

Parameters:

peerid - The peer to be chanllenged

delay - The delay

disconnectFromRendezVous

public void disconnectFromRendezVous(ID peerId)

Remove a RendezVousService point.

Specified by:

disconnectFromRendezVous in class RendezVousServiceProvider

Parameters:

peerId - the PeerId of the RendezVous to disconnect from.

propagate

public void propagate(Message msg,
                      String serviceName,
                      String serviceParam,
                      int ttl)
               throws IOException

Propagates a message onto as many peers on the local network as possible. Typically the message will go to all the peers to which at least one endpoint transport can address without using the router. This method sends the message to all peers, rendezvous peers and edge peer. This method of propation is very expensive and should not be frequentely used. When rendezvous peers are used in order to cache index of data, it is more efficient to use the walk() method. Only a single HOP at a time is performed. Messages are always delivered to the destination handler on arrival. This handler is responsible for repropagating further, if deemed appropropriate. Loop and TTL control are performed automatically. Messages can be propagated via this method for the first time or can be re-propagated by re-using a message that came in via propagation. In the later case, the TTL and loop detection parameters CANNOT be re-initialized. If one wants to "re-propagate" a message with a new TTL and blank gateways list one must generate a completely new message. This limits the risk of accidental propagation storms, although they can always be engineered deliberately. Note: The original msg is not modified and may be reused upon return.

Specified by:

propagate in class RendezVousServiceProvider

Parameters:

msg - is the message to propagate.

serviceName - is the name of the service

serviceParam - is the parameter of the service

Throws:

IOException

propagateInGroup

public void propagateInGroup(Message msg,
                             String serviceName,
                             String serviceParam,
                             int ttl)
                      throws IOException

Specified by:

propagateInGroup in class RendezVousServiceProvider

Throws:

IOException

repropagate

protected void repropagate(Message msg,
                           RendezVousPropagateMessage propHdr,
                           String serviceName,
                           String serviceParam)

Specified by:

repropagate in class RendezVousServiceProvider

walk

public void walk(Message msg,
                 String serviceName,
                 String serviceParam,
                 int ttl)
          throws IOException

Walk a message through the rendezvous peers of the network: only rendezvous peers will receive the message. Only a single HOP at a time is performed. Messages are always delivered to the destination handler on arrival. This handler is responsible for repropagating further, if deemed appropropriate. Loop and TTL control are performed automatically. Messages can be propagated via this method for the first time or can be re-propagated by re-using a message that came in via propagation. In the later case, the TTL and loop detection parameters CANNOT be re-initialized. If one wants to "re-propagate" a message with a new TTL and blank gateways list one must generate a completely new message. This limits the risk of accidental propagation storms, although they can always be engineered deliberately. Note: The original msg is not modified and may be reused upon return.

Specified by:

walk in class RendezVousServiceProvider

Parameters:

msg - is the message to walk.

serviceName - is the name of the service

serviceParam - is the parameter of the service

ttl - is the maximum TTL of the message (note that the Rendezvous Service implementation is free to decrease that value.

Throws:

IOException - when walking the message is impossible (network failure)

walk

public void walk(Vector destPeerIDs,
                 Message msg,
                 String serviceName,
                 String serviceParam,
                 int ttl)
          throws IOException

Walk a message through the rendezvous peers of the network: only rendezvous peers will receive the message. Only a single HOP at a time is performed. Messages are always delivered to the destination handler on arrival. This handler is responsible for repropagating further, if deemed appropropriate. Loop and TTL control are performed automatically. Messages can be propagated via this method for the first time or can be re-propagated by re-using a message that came in via propagation. In the later case, the TTL and loop detection parameters CANNOT be re-initialized. If one wants to "re-propagate" a message with a new TTL and blank gateways list one must generate a completely new message. This limits the risk of accidental propagation storms, although they can always be engineered deliberately. Note: The original msg is not modified and may be reused upon return.

Specified by:

walk in class RendezVousServiceProvider

Parameters:

destPeerIDs - is a Vector of PeerID of the peers which are receiving first the walker. Note that each entry in the Vector will create its own walker.

msg - is the message to walk.

serviceName - is the name of the service

serviceParam - is the parameter of the service

ttl - is the maximum TTL of the message (note that the Rendezvous Service implementation is free to decrease that value.

Throws:

IOException - when walking the message is impossible (network failure)

getPeerConnection

public PeerConnection getPeerConnection(ID peer)

Description copied from class: StdRendezVousService

Returns the peer connection or null if not present.

Specified by:

getPeerConnection in class StdRendezVousService

Returns:

PeerConnection the peer connection or null if not present.

getPeerConnections

protected PeerConnection[] getPeerConnections()

Description copied from class: StdRendezVousService

Returns a list of the current peer connections.

Specified by:

getPeerConnections in class StdRendezVousService

Returns:

PeerConnection the peer connection or null if not present.

setChoiceDelay

public void setChoiceDelay(long delay)

Specified by:

setChoiceDelay in class RendezVousServiceProvider

peerViewEvent

public void peerViewEvent(PeerViewEvent event)

peerViewEvent the peerview event

Specified by:

peerViewEvent in interface PeerViewListener