org.jgroups.protocols.pbcast

Class 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: 1.29 $

Author: Bela Ban

Constructor Summary
ClientGmsImpl(GMS g)
Method Summary
voidhandleJoin(Address mbr)
voidhandleJoinResponse(JoinRsp join_rsp)
voidhandleLeave(Address mbr, boolean suspected)
Returns false.
voidhandleLeaveResponse()
voidhandleSuspect(Address mbr)
Returns immediately.
booleanhandleUpEvent(Event evt)
voidhandleViewChange(View new_view, Digest digest)
Does nothing.
voidinit()
voidjoin(Address mbr)
Joins this process to a group.
voidleave(Address mbr)
voidsuspect(Address mbr)
voidunsuspect(Address mbr)

Constructor Detail

ClientGmsImpl

public ClientGmsImpl(GMS g)

Method Detail

handleJoin

public void handleJoin(Address mbr)

handleJoinResponse

public void handleJoinResponse(JoinRsp join_rsp)

handleLeave

public void handleLeave(Address mbr, boolean suspected)
Returns false. Clients don't handle leave() requests

handleLeaveResponse

public void handleLeaveResponse()

handleSuspect

public void handleSuspect(Address mbr)
Returns immediately. Clients don't handle suspect() requests

handleUpEvent

public boolean handleUpEvent(Event evt)

handleViewChange

public void handleViewChange(View new_view, Digest digest)
Does nothing. Discards all views while still client.

init

public void init()

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.

Parameters: mbr Our own address (assigned through SET_LOCAL_ADDRESS)

leave

public void leave(Address mbr)

suspect

public void suspect(Address mbr)

unsuspect

public void unsuspect(Address mbr)
Copyright ? 1998-2005 Bela Ban. All Rights Reserved.