TwoPhaseVotingAdapter (JGroups)

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 class	TwoPhaseVotingAdapter.TwoPhaseVoteWrapper
static class	TwoPhaseVotingAdapter.TwoPhaseWrapper Wrapper of the decree to voting decree.

Nested Class Summary

static class

TwoPhaseVotingAdapter.TwoPhaseVoteWrapper

static class

TwoPhaseVotingAdapter.TwoPhaseWrapper

Wrapper of the decree to voting decree.

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

Constructor Summary

TwoPhaseVotingAdapter(VotingAdapter voteChannel)

Creats an instance of the class.

Method Summary
void	addListener(TwoPhaseVotingListener listener) Wraps actual listener with the VoteChannelListener and adds to the voteChannel
VotingAdapter	getVoteChannel()
void	removeListener(TwoPhaseVotingListener listener) Removes the listener from the voteChannel
boolean	vote(Object decree, long timeout) Performs the two-phase voting on the decree.
boolean	vote(Object decree, long timeout, VoteResponseProcessor voteResponseProcessor) Performs the two-phase voting on the decree.

Method Summary

void

addListener(TwoPhaseVotingListener listener)

Wraps actual listener with the VoteChannelListener and adds to the voteChannel

VotingAdapter

getVoteChannel()

void

removeListener(TwoPhaseVotingListener listener)

Removes the listener from the voteChannel

boolean

vote(Object decree, long timeout)

Performs the two-phase voting on the decree.