/**
* Performs the two-phase voting on the decree. After the voting each group member remains in the
* same state as others.
*/
public boolean vote(Object decree, long timeout, VoteResponseProcessor voteResponseProcessor)
throws ChannelException {
// wrap real decree
TwoPhaseWrapper wrappedDecree = new TwoPhaseWrapper(decree);
// check the decree acceptance
try {
if (voteChannel.vote(wrappedDecree, timeout / 3, voteResponseProcessor)) {
wrappedDecree.commit();
// try to commit decree
if (!voteChannel.vote(wrappedDecree, timeout / 3, voteResponseProcessor)) {
// strange, should fail during prepare... abort all
wrappedDecree.abort();
voteChannel.vote(wrappedDecree, timeout / 3, voteResponseProcessor);
return false;
} else return true;
} else {
// somebody is not accepting the decree... abort
wrappedDecree.abort();
voteChannel.vote(wrappedDecree, timeout / 3, voteResponseProcessor);
return false;
}
} catch (ChannelException chex) {
wrappedDecree.abort();
voteChannel.vote(wrappedDecree, timeout / 3, voteResponseProcessor);
throw chex;
}
}
public boolean vote(Object decree) throws VoteException {
if (!(decree instanceof TwoPhaseWrapper))
throw new VoteException("Not my type of decree. Ignore me.");
TwoPhaseWrapper wrapper = (TwoPhaseWrapper) decree;
// invoke the corresponding operation
if (wrapper.isPrepare()) return listener.prepare(wrapper.getDecree());
else if (wrapper.isCommit()) return listener.commit(wrapper.getDecree());
else {
listener.abort(wrapper.getDecree());
return false;
}
}
