/**
* 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"A ignore outdated LEARN message " + msg.getProposalNo());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());
}
}
/** main loop */
public FleaseMessage processMessage(FleaseMessage msg) {
assert (!quit);
/*if (Logging.isDebug())
Logging.logMessage(Logging.LEVEL_DEBUG,this,"received %s",msg.toString());*/
final long now = TimeSync.getLocalSystemTime();
if (msg.getSendTimestamp() + config.getMessageTimeout() < TimeSync.getGlobalTime()) {
// old message, ignore
if (Logging.isDebug() && config.isDebugPrintMessages())
Logging.logMessage(
Logging.LEVEL_DEBUG,
Category.replication,
this,
"A outdated message discarded: %s",
msg.toString());
return null;
}
if (this.waitUntilTimestamp_ms >= now) {
if (Logging.isDebug() && config.isDebugPrintMessages())
Logging.logMessage(
Logging.LEVEL_DEBUG,
Category.replication,
this,
"A message discarded, acceptor is still in recovery period");
return null;
}
assert (msg.getCellId() != null);
final FleaseAcceptorCell cc = getCell(msg.getCellId());
if (cc.getViewId() < msg.getViewId()) {
// If the local view is lower than the delivered one, the view listener has to be informed to
// update
// the local view. But the request can still be answered.
viewListener.viewIdChangeEvent(msg.getCellId(), msg.getViewId());
} else if (cc.getViewId() > msg.getViewId()
|| (cc.getViewId() == msg.getViewId() && cc.isViewInvalidated())) {
// If the request is from an older view, or the a view that has been invalidated on this
// AcceptorCell, the request has to be aborted.
FleaseMessage response = new FleaseMessage(FleaseMessage.MsgType.MSG_WRONG_VIEW, msg);
response.setViewId(cc.getViewId());
return response;
}
FleaseMessage response = null;
if (msg.getMsgType() == FleaseMessage.MsgType.MSG_PREPARE) response = handlePREPARE(msg);
else if (msg.getMsgType() == FleaseMessage.MsgType.MSG_ACCEPT) response = handleACCEPT(msg);
else if (msg.getMsgType() == FleaseMessage.MsgType.MSG_LEARN) handleLEARN(msg);
/*else if (msg.getMsgType() == FleaseMessage.MsgType.MSG_GET_LEASE)
response = handleGETLEASE(msg);
else if (msg.getMsgType() == FleaseMessage.MsgType.MSG_RENEW_LEASE)
response = handleRENEWINSTANCE(msg);*/
else
Logging.logMessage(
Logging.LEVEL_ERROR,
Category.replication,
this,
"A invalid message type received: %s",
msg.toString());
/*if (Logging.isDebug())
Logging.logMessage(Logging.LEVEL_DEBUG,this,"response %s",(response != null) ? response.toString() : "<empty>");*/
return response;
}
private FleaseAcceptorCell getCell(FleaseMessage msg) {
assert (msg != null);
return getCell(msg.getCellId());
}