org.javagroups.protocols.pbcast
Class ClientGmsImpl

java.lang.Object
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  +--org.javagroups.protocols.pbcast.GmsImpl
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        +--org.javagroups.protocols.pbcast.ClientGmsImpl

public class ClientGmsImpl

extends GmsImpl

Client part of GMS. Whenever a new member wants to join a group, it starts in the CLIENT role. No multicasts to the group will be received and processed until the member has been joined and turned into a SERVER (either coordinator or participant, mostly just participant). This class only implements Join (called by clients who want to join a certain group, and ViewChange which is called by the coordinator that was contacted by this client, to tell the client what its initial membership is.

Version:

$Revision: 1.8 $

Author:

Bela Ban

Field Summary

Fields inherited from class org.javagroups.protocols.pbcast.GmsImpl

gms

Constructor Summary

ClientGmsImpl(GMS g)

Method Summary

JoinRsp	handleJoin(Address mbr)
void	handleJoinResponse(JoinRsp join_rsp)
void	handleLeave(Address mbr, boolean suspected) Returns false.
void	handleLeaveResponse()
void	handleSuspect(Address mbr) Returns immediately.
boolean	handleUpEvent(Event evt)
void	handleViewChange(View new_view, Digest digest) Does nothing.
void	join(Address mbr) Joins this process to a group.
void	leave(Address mbr)
void	suspect(Address mbr)
void	unsuspect(Address mbr)

Methods inherited from class org.javagroups.protocols.pbcast.GmsImpl

handleDownEvent, handleMergeCancelled, handleMergeRequest, handleMergeResponse, handleMergeView, init, iWouldBeCoordinator, merge, start, stop, wrongMethod

Methods inherited from class java.lang.Object

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

Constructor Detail

ClientGmsImpl

public ClientGmsImpl(GMS g)

Method Detail

join

public void join(Address mbr)

Joins this process to a group. Determines the coordinator and sends a unicast handleJoin() message to it. The coordinator returns a JoinRsp and then broadcasts the new view, which contains a message digest and the current membership (including the joiner). The joiner is then supposed to install the new view and the digest and starts accepting mcast messages. Previous mcast messages were discarded (this is done in PBCAST).

If successful, impl is changed to an instance of ParticipantGmsImpl. Otherwise, we continue trying to send join() messages to the coordinator, until we succeed (or there is no member in the group. In this case, we create our own singleton group).

When GMS.disable_initial_coord is set to true, then we won't become coordinator on receiving an initial membership of 0, but instead will retry (forever) until we get an initial membership of > 0.

Specified by:

join in class GmsImpl

Parameters:

mbr - Our own address (assigned through SET_LOCAL_ADDRESS)

leave

public void leave(Address mbr)

Specified by:

leave in class GmsImpl

handleJoinResponse

public void handleJoinResponse(JoinRsp join_rsp)

Specified by:

handleJoinResponse in class GmsImpl

handleLeaveResponse

public void handleLeaveResponse()

Specified by:

handleLeaveResponse in class GmsImpl

suspect

public void suspect(Address mbr)

Specified by:

suspect in class GmsImpl

unsuspect

public void unsuspect(Address mbr)

Specified by:

unsuspect in class GmsImpl

handleJoin

public JoinRsp handleJoin(Address mbr)

Specified by:

handleJoin in class GmsImpl

handleLeave

public void handleLeave(Address mbr,
                        boolean suspected)

Returns false. Clients don't handle leave() requests

Specified by:

handleLeave in class GmsImpl

handleViewChange

public void handleViewChange(View new_view,
                             Digest digest)

Does nothing. Discards all views while still client.

Specified by:

handleViewChange in class GmsImpl

handleSuspect

public void handleSuspect(Address mbr)

Returns immediately. Clients don't handle suspect() requests

Specified by:

handleSuspect in class GmsImpl

handleUpEvent

public boolean handleUpEvent(Event evt)

Overrides:

handleUpEvent in class GmsImpl