/**
* Handles paxos prepare messages
*
* @param msg the incomming message
* @return a response message
*/
public FleaseMessage handlePREPARE(FleaseMessage msg) {
final FleaseAcceptorCell cc = getCell(msg);
cc.touch();
if ((cc.getPrepared() != null) && (cc.getPrepared().after(msg))) {
if (Logging.isDebug() && config.isDebugPrintMessages()) {
final String preped =
(cc.getPrepared() == null)
? ProposalNumber.EMPTY_PROPOSAL_NUMBER.toString()
: cc.getPrepared().getProposalNo().toString();
Logging.logMessage(
Logging.LEVEL_DEBUG,
Category.replication,
this,
"A prepare NACK p:" + preped + " is after " + msg.getProposalNo() + "");
}
FleaseMessage reject = new FleaseMessage(FleaseMessage.MsgType.MSG_PREPARE_NACK, msg);
reject.setPrevProposalNo(cc.getPrepared().getProposalNo());
reject.setLeaseHolder(null);
reject.setLeaseTimeout(0);
reject.setSendTimestamp(TimeSync.getGlobalTime());
return reject;
} else {
if (Logging.isDebug() && config.isDebugPrintMessages()) {
final String preped =
(cc.getPrepared() == null)
? ProposalNumber.EMPTY_PROPOSAL_NUMBER.toString()
: cc.getPrepared().getProposalNo().toString();
final String acced =
(cc.getAccepted() == null)
? ProposalNumber.EMPTY_PROPOSAL_NUMBER.toString()
: cc.getAccepted().getProposalNo()
+ "="
+ cc.getAccepted().getLeaseHolder()
+ "/"
+ cc.getAccepted().getLeaseTimeout();
Logging.logMessage(
Logging.LEVEL_DEBUG,
Category.replication,
this,
"A prepare ACK p:" + preped + " -> " + msg.getProposalNo() + " a:" + acced);
}
// lastPrepared = msg;
cc.setPrepared(msg);
// FIXME:Persistently write to disk
FleaseMessage response = new FleaseMessage(FleaseMessage.MsgType.MSG_PREPARE_ACK, msg);
if (cc.getAccepted() != null) {
response.setPrevProposalNo(cc.getAccepted().getProposalNo());
response.setLeaseHolder(cc.getAccepted().getLeaseHolder());
assert (response.getLeaseHolder() != null);
response.setLeaseTimeout(cc.getAccepted().getLeaseTimeout());
}
response.setSendTimestamp(TimeSync.getGlobalTime());
return response;
}
}
/**
* Handles paxos learn messages. Removes oudated instances and updates maxLearnedInstId
* accordingly
*
* @param msg incomming message
*/
public void handleLEARN(FleaseMessage msg) {
final FleaseAcceptorCell cc = getCell(msg);
cc.touch();
if ((cc.getPrepared() != null) && (cc.getPrepared().after(msg))
|| (cc.getAccepted() != null) && (cc.getAccepted().after(msg))) {
if (Logging.isDebug() && config.isDebugPrintMessages())
Logging.logMessage(
Logging.LEVEL_DEBUG,
Category.replication,
this,
"A ignore outdated LEARN message " + msg.getProposalNo());
} else {
if (Logging.isDebug() && config.isDebugPrintMessages()) {
final String preped =
(cc.getPrepared() == null)
? ProposalNumber.EMPTY_PROPOSAL_NUMBER.toString()
: cc.getPrepared().getProposalNo().toString();
final String acced =
(cc.getAccepted() == null)
? ProposalNumber.EMPTY_PROPOSAL_NUMBER.toString()
: cc.getAccepted().getProposalNo()
+ "="
+ cc.getAccepted().getLeaseHolder()
+ "/"
+ cc.getAccepted().getLeaseTimeout();
Logging.logMessage(
Logging.LEVEL_DEBUG,
Category.replication,
this,
"A learn p:"
+ preped
+ " a: "
+ acced
+ " -> "
+ msg.getProposalNo()
+ "="
+ msg.getLeaseHolder()
+ "/"
+ msg.getLeaseTimeout());
}
cc.setAccepted(msg);
cc.setPrepared(msg);
cc.setLatestLearn(msg);
evtListener.learnedEvent(
msg.getCellId(), msg.getLeaseHolder(), msg.getLeaseTimeout(), msg.getMasterEpochNumber());
}
}
/**
* Handles paxos accept (vote) messages.
*
* @param msg incomming message
* @return a response message or null
*/
public FleaseMessage handleACCEPT(FleaseMessage msg) {
final FleaseAcceptorCell cc = getCell(msg);
cc.touch();
if ((cc.getPrepared() != null) && (cc.getPrepared().after(msg))) {
// reject the request
if (Logging.isDebug() && config.isDebugPrintMessages()) {
final String preped =
(cc.getPrepared() == null)
? ProposalNumber.EMPTY_PROPOSAL_NUMBER.toString()
: cc.getPrepared().getProposalNo().toString();
Logging.logMessage(
Logging.LEVEL_DEBUG,
Category.replication,
this,
"A accept NACK p:" + preped + " is after " + msg.getProposalNo() + "");
}
FleaseMessage tmp = new FleaseMessage(FleaseMessage.MsgType.MSG_ACCEPT_NACK, msg);
tmp.setSendTimestamp(TimeSync.getGlobalTime());
tmp.setLeaseHolder(null);
tmp.setLeaseTimeout(0);
tmp.setPrevProposalNo(cc.getPrepared().getProposalNo());
return tmp;
} else {
// okay accept it
if (Logging.isDebug() && config.isDebugPrintMessages()) {
final String preped =
(cc.getPrepared() == null)
? ProposalNumber.EMPTY_PROPOSAL_NUMBER.toString()
: cc.getPrepared().getProposalNo().toString();
final String acced =
(cc.getAccepted() == null)
? ProposalNumber.EMPTY_PROPOSAL_NUMBER.toString()
: cc.getAccepted().getProposalNo()
+ "="
+ cc.getAccepted().getLeaseHolder()
+ "/"
+ cc.getAccepted().getLeaseTimeout();
Logging.logMessage(
Logging.LEVEL_DEBUG,
Category.replication,
this,
"A accept ACK p:"
+ preped
+ " a: "
+ acced
+ " -> "
+ msg.getProposalNo()
+ "="
+ msg.getLeaseHolder()
+ "/"
+ msg.getLeaseTimeout());
}
assert (msg.getLeaseHolder() != null);
cc.setAccepted(msg);
cc.setPrepared(msg);
FleaseMessage tmp = new FleaseMessage(FleaseMessage.MsgType.MSG_ACCEPT_ACK, msg);
tmp.setSendTimestamp(TimeSync.getGlobalTime());
return tmp;
}
}