org.javagroups.protocols.pbcast
Class CoordGmsImpl

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

gms

Constructor Summary

CoordGmsImpl(GMS g)

Method Summary

JoinRsp	handleJoin(Address mbr) Computes the new view (including the newly joined member) and get the digest from PBCAST.
void	handleJoinResponse(JoinRsp join_rsp)
void	handleLeave(Address mbr, boolean suspected) Exclude mbr from the membership.
void	handleLeaveResponse()
void	handleMergeCancelled(java.lang.Object merge_id)
void	handleMergeRequest(Address sender, java.lang.Object 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, java.lang.Object merge_id)
void	handleMergeView(MergeData data, java.lang.Object merge_id) If merge_id != this.merge_id --> discard Else cast the view/digest to all members of this group.
void	handleSuspect(Address mbr)
void	handleViewChange(View new_view, Digest digest) Called by the GMS when a VIEW is received.
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.javagroups.protocols.pbcast.GmsImpl

handleDownEvent, handleUpEvent, init, iWouldBeCoordinator, 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

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,
                               java.lang.Object 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,
                                java.lang.Object merge_id)

Overrides:

handleMergeResponse in class GmsImpl

handleMergeView

public void handleMergeView(MergeData data,
                            java.lang.Object merge_id)

If merge_id != this.merge_id --> discard Else cast the view/digest to all members of this group.

Overrides:

handleMergeView in class GmsImpl

handleMergeCancelled

public void handleMergeCancelled(java.lang.Object merge_id)

Overrides:

handleMergeCancelled in class GmsImpl

handleJoin

public JoinRsp handleJoin(Address mbr)

Computes the new view (including the newly joined member) and get the digest from PBCAST. Returns both in the form of a JoinRsp

Specified by:

handleJoin in class GmsImpl

handleLeave

public void handleLeave(Address mbr,
                        boolean suspected)

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:

handleLeave 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

handleSuspect

public void handleSuspect(Address mbr)

Specified by:

handleSuspect in class GmsImpl

stop

public void stop()

Overrides:

stop in class GmsImpl