/**
* Work through the chosen messages sending what we have left and stopping once we get to an
* unfilled slot or the end of the array.
*/
private void onChosen(PaxosMessage proposal) {
chosen.set(proposal.getInstanceNum(), (ChatMessage) proposal.getValue());
if (proposal.getInstanceNum() >= nextInstance) nextInstance = proposal.getInstanceNum() + 1;
while (lastSent + 1 < chosen.size()) {
ChatMessage toSend = chosen.get(lastSent + 1);
if (toSend != null) {
if (nodeIsLeader()) sendToClients(toSend);
lastSent++;
} else {
break; // There is still a missing slot.
}
}
}
@Override
public void handlePropose(PaxosMessage proposal) {
if (preparedFor > proposal.getProposeNum()) return;
ensureSize(accepted, proposal.getInstanceNum() + 1);
ensureSize(chosen, proposal.getInstanceNum() + 1);
accepted.set(proposal.getInstanceNum(), (ChatMessage) proposal.getValue());
// Send accept to all
/* sendAllMessage(new DefaultPaxosMessage(proposal.getInstanceNum(),
proposal.getProposeNum(),
id,
PaxosMessageType.ACCEPTED,
proposal.getValue())); */
// Silently accept proposals
}
@Override
public void handleAccepted(PaxosMessage proposal) {
ensureSize(chosen, proposal.getInstanceNum() + 1); // Prevent NPE
if (chosen.get(proposal.getInstanceNum()) != null)
return; // Something has already been chosen so I dont care anymore.
List<PaxosMessage> acceptedVotes = proposalAcceptedVotes.get(proposal.getInstanceNum());
if (acceptedVotes == null) {
acceptedVotes = new ArrayList<PaxosMessage>();
acceptedVotes.add(proposal);
proposalAcceptedVotes.put(proposal.getInstanceNum(), acceptedVotes);
} else {
for (PaxosMessage acceptedVote : acceptedVotes) {
if (proposal.getProposerId() == acceptedVote.getProposerId())
return; // This person is reaffirming their acceptance of this instances proposal.
}
acceptedVotes.add(proposal);
proposalAcceptedVotes.put(proposal.getInstanceNum(), acceptedVotes);
}
// handle being chosen
if (proposalAcceptedVotes.get(proposal.getInstanceNum()).size() >= serverSet.getQuorumSize()) {
onChosen(proposal);
}
}