@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);
}
}
private void sendMessage(Serializable message, short serverId) {
try {
if (serverId == id) { // Sending to myself.
messageReceived(null, message);
} else {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
ObjectSerializationOutputStream objectOutputStream =
new ObjectSerializationOutputStream(byteArrayOutputStream);
objectOutputStream.writeObject(message);
objectOutputStream.flush();
ByteBuffer payload = ByteBuffer.wrap(byteArrayOutputStream.toByteArray());
channel.send(payload, serverSet.getServer(serverId));
}
} catch (IOException e) {
System.out.println("Failed to send message");
e
.printStackTrace(); // To change body of catch statement use File | Settings | File
// Templates.
} catch (Exception e) {
e
.printStackTrace(); // To change body of catch statement use File | Settings | File
// Templates.
}
}
private short getLeader() {
return (short) (preparedFor % serverSet.getNumServers());
}
private void sendAllMessage(PaxosMessage message) {
for (short i = 0; i < serverSet.getNumServers(); i++) {
sendMessage(message, i);
}
}
private boolean nodeIsLeader() {
return id == getLeader() && prepareResponseFrom.size() >= serverSet.getQuorumSize();
}