org.jgroups.protocols.pbcast

Class CoordGmsImpl

java.lang.Object

org.jgroups.protocols.pbcast.GmsImpl

org.jgroups.protocols.pbcast.CoordGmsImpl

public class CoordGmsImpl
extends GmsImpl

Coordinator role of the Group MemberShip (GMS) protocol. Accepts JOIN and LEAVE requests and emits view changes accordingly.

Author:

Bela Ban

Field Summary

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

gms, log

Constructor Summary

Constructors

Constructor and Description
CoordGmsImpl(GMS g)

Method Summary

Methods

Modifier and Type	Method and Description
void	handleExit()
void	handleJoinResponse(JoinRsp join_rsp)
void	handleLeaveResponse()
void	handleMembershipChange(java.util.Collection new_mbrs, java.util.Collection leaving_mbrs, java.util.Collection suspected_mbrs) Exclude mbr from the membership.
void	handleMergeCancelled(ViewId merge_id)
void	handleMergeRequest(Address sender, ViewId merge_id) Get the view and digest and send back both (MergeData) in the form of a MERGE_RSP to the sender.
void	handleMergeResponse(MergeData data, ViewId merge_id)
void	handleMergeView(MergeData data, ViewId merge_id) If merge_id is not equal to this.merge_id then discard.
void	handleViewChange(View new_view, Digest digest) Called by the GMS when a VIEW is received.
void	init()
void	join(Address mbr)
void	leave(Address mbr) The coordinator itself wants to leave the group
void	merge(java.util.Vector other_coords) Invoked upon receiving a MERGE event from the MERGE layer.
void	stop()
void	suspect(Address mbr)
void	unsuspect(Address mbr)

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

handleUpEvent, iWouldBeCoordinator, sendMergeRejectedResponse, start, wrongMethod

Methods inherited from class java.lang.Object

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

Constructor Detail

CoordGmsImpl

public CoordGmsImpl(GMS g)

Method Detail

init

public void init()
          throws java.lang.Exception

Overrides:

init in class GmsImpl

Throws:

java.lang.Exception

join

public void join(Address mbr)

Specified by:

join in class GmsImpl

leave

public void leave(Address mbr)

The coordinator itself wants to leave the group

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

merge

public void merge(java.util.Vector other_coords)

Invoked upon receiving a MERGE event from the MERGE layer. Starts the merge protocol. See description of protocol in DESIGN.

Overrides:

merge in class GmsImpl

Parameters:

other_coords - A list of coordinators (including myself) found by MERGE protocol

handleMergeRequest

public void handleMergeRequest(Address sender,
                      ViewId merge_id)

Get the view and digest and send back both (MergeData) in the form of a MERGE_RSP to the sender. If a merge is already in progress, send back a MergeData with the merge_rejected field set to true.

Overrides:

handleMergeRequest in class GmsImpl

handleMergeResponse

public void handleMergeResponse(MergeData data,
                       ViewId merge_id)

Overrides:

handleMergeResponse in class GmsImpl

handleMergeView

public void handleMergeView(MergeData data,
                   ViewId merge_id)

If merge_id is not equal to this.merge_id then discard. Else cast the view/digest to all members of this group.

Overrides:

handleMergeView in class GmsImpl

handleMergeCancelled

public void handleMergeCancelled(ViewId merge_id)

Overrides:

handleMergeCancelled in class GmsImpl

handleMembershipChange

public void handleMembershipChange(java.util.Collection new_mbrs,
                          java.util.Collection leaving_mbrs,
                          java.util.Collection suspected_mbrs)

Exclude mbr from the membership. If suspected is true, then this member crashed and therefore is forced to leave, otherwise it is leaving voluntarily.

Specified by:

handleMembershipChange in class GmsImpl

handleViewChange

public void handleViewChange(View new_view,
                    Digest digest)

Called by the GMS when a VIEW is received.

Specified by:

handleViewChange in class GmsImpl

Parameters:

new_view - The view to be installed

digest - If view is a MergeView, digest contains the seqno digest of all members and has to be set by GMS

handleExit

public void handleExit()

Overrides:

handleExit in class GmsImpl

stop

public void stop()

Overrides:

stop in class GmsImpl