org.jgroups.blocks

Class TwoPhaseVotingAdapter

public class TwoPhaseVotingAdapter extends Object

This adapter introduces simple two-phase voting on a specified decree. All nodes in the group receive a decree in "prepare" phase where they expres their opinion on the decree. If all nodes voted positively on decree, next phase "commit" fixes changes that were made in "prepare" phase, otherwise changes are canceled in "abort" phase.

Version: $Id: TwoPhaseVotingAdapter.java,v 1.4 2005/06/08 15:56:54 publicnmi Exp $

Author: Roman Rokytskyy (rrokytskyy@acm.org) Robert Schaffar-Taurok (robert@fusion.at)

Nested Class Summary
static classTwoPhaseVotingAdapter.TwoPhaseVoteWrapper
static classTwoPhaseVotingAdapter.TwoPhaseWrapper
Wrapper of the decree to voting decree.
Constructor Summary
TwoPhaseVotingAdapter(VotingAdapter voteChannel)
Creats an instance of the class.
Method Summary
voidaddListener(TwoPhaseVotingListener listener)
Wraps actual listener with the VoteChannelListener and adds to the voteChannel
VotingAdaptergetVoteChannel()
voidremoveListener(TwoPhaseVotingListener listener)
Removes the listener from the voteChannel
booleanvote(Object decree, long timeout)
Performs the two-phase voting on the decree.
booleanvote(Object decree, long timeout, VoteResponseProcessor voteResponseProcessor)
Performs the two-phase voting on the decree.

Constructor Detail

TwoPhaseVotingAdapter

public TwoPhaseVotingAdapter(VotingAdapter voteChannel)
Creats an instance of the class.

Parameters: voteChannel the channel that will be used for voting.

Method Detail

addListener

public void addListener(TwoPhaseVotingListener listener)
Wraps actual listener with the VoteChannelListener and adds to the voteChannel

getVoteChannel

public VotingAdapter getVoteChannel()

Returns: Returns the voteChannel.

removeListener

public void removeListener(TwoPhaseVotingListener listener)
Removes the listener from the voteChannel

vote

public boolean vote(Object decree, long timeout)
Performs the two-phase voting on the decree. After the voting each group member remains in the same state as others.

vote

public boolean vote(Object decree, long timeout, VoteResponseProcessor voteResponseProcessor)
Performs the two-phase voting on the decree. After the voting each group member remains in the same state as others.
Copyright ? 1998-2005 Bela Ban. All Rights Reserved.