TwoPhaseVotingAdapter

java.lang.Object
- org.jgroups.blocks.TwoPhaseVotingAdapter

```
public class TwoPhaseVotingAdapter
extends java.lang.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

Nested Classes
Modifier and Type	Class	Description
`static class`	`TwoPhaseVotingAdapter.TwoPhaseVoteWrapper`
`static class`	`TwoPhaseVotingAdapter.TwoPhaseWrapper`	Wrapper of the decree to voting decree.

Constructor Summary

Constructors
Constructor Description

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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(java.lang.Object decree, long timeout)`	Performs the two-phase voting on the decree.
`boolean`	`vote(java.lang.Object decree, long timeout, VoteResponseProcessor voteResponseProcessor)`	Performs the two-phase voting on the decree.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 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
  - removeListener
```
public void removeListener(TwoPhaseVotingListener listener)
```
    Removes the listener from the voteChannel
  - vote
```
public boolean vote(java.lang.Object decree,
                    long timeout)
             throws ChannelException
```
    Performs the two-phase voting on the decree. After the voting each group member remains in the same state as others.
    
    Throws:
    
    ChannelException
  - vote
```
public boolean vote(java.lang.Object decree,
                    long timeout,
                    VoteResponseProcessor voteResponseProcessor)
             throws ChannelException
```
    Performs the two-phase voting on the decree. After the voting each group member remains in the same state as others.
    
    Throws:
    
    ChannelException
  - getVoteChannel
```
public VotingAdapter getVoteChannel()
```
    Returns:
    
    Returns the voteChannel.