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package com.sun.messaging.jmq.jmsserver.persist.file;
import java.io.IOException;
import java.util.HashSet;
import com.sun.messaging.jmq.jmsserver.Globals;
import com.sun.messaging.jmq.jmsserver.core.DestinationUID;
import com.sun.messaging.jmq.jmsserver.data.BaseTransaction;
import com.sun.messaging.jmq.jmsserver.data.RemoteTransaction;
import com.sun.messaging.jmq.jmsserver.data.TransactionAcknowledgement;
import com.sun.messaging.jmq.jmsserver.data.TransactionState;
import com.sun.messaging.jmq.jmsserver.data.TransactionUID;
import com.sun.messaging.jmq.jmsserver.persist.api.Store;
import com.sun.messaging.jmq.jmsserver.util.BrokerException;
import com.sun.messaging.jmq.util.log.Logger;
public class RemoteTransactionManager extends BaseTransactionManager {
RemoteTransactionManager(TransactionLogManager transactionLogManager) {
super(transactionLogManager);
}
void processStoredTxnOnStartup(BaseTransaction baseTxn) {
if (Store.getDEBUG()) {
String msg = getPrefix() + " processStoredTxnOnStartup " + baseTxn;
logger.log(Logger.DEBUG, msg);
}
TransactionUID tid = baseTxn.getTid();
int state = baseTxn.getState();
if (state == TransactionState.COMMITTED
|| state == TransactionState.ROLLEDBACK) {
addToCompleteStored(baseTxn);
} else if (state == TransactionState.PREPARED) {
addToIncompleteStored(baseTxn);
}
}
TransactionEvent generateEvent(BaseTransaction baseTxn, boolean completion) throws IOException,
BrokerException {
if (Store.getDEBUG()) {
Globals.getLogger().log(Logger.DEBUG,
getPrefix() + " generateEvent ");
}
RemoteTransactionEvent result = null;
if(completion)
{
result = new RemoteTransaction2PCompleteEvent();
}
else if (baseTxn.getState() == TransactionState.PREPARED) {
result = new RemoteTransaction2PPrepareEvent();
} else {
// TO DO FILL IN HERE
throw new UnsupportedOperationException();
}
result.remoteTransaction = (RemoteTransaction) baseTxn;
return result;
}
void processTxn(BaseTransaction baseTxn) throws IOException,
BrokerException {
if (Store.getDEBUG()) {
String msg = getPrefix() + " processTxn " + baseTxn;
logger.log(Logger.DEBUG, msg);
}
int state = baseTxn.getState();
if (state == TransactionState.PREPARED) {
addToIncompleteUnstored(baseTxn);
} else {
throw new UnsupportedOperationException();
}
}
BaseTransaction processTxnCompletion(TransactionUID tid, int state)
throws IOException, BrokerException {
if (Store.getDEBUG()) {
Globals.getLogger().log(Logger.DEBUG,
getPrefix() + " processTxnCompletion " + tid);
}
// We are committing a prepared remote transaction.
// Check if it is in the prepared transaction store
// If it is, mark it as committed and remove from prepared store
boolean removeFromStore = true;
return processTxnCompletion(tid, state, removeFromStore);
}
void replayTransactionEvent(TransactionEvent txnEvent, HashSet dstLoadedSet)
throws BrokerException, IOException {
if (Store.getDEBUG()) {
Globals.getLogger().log(Logger.DEBUG,
getPrefix() + " replayTransactionEvent");
}
RemoteTransactionEvent remoteTxnEvent = (RemoteTransactionEvent) txnEvent;
// replay to store on commit
RemoteTransaction remoteTxn = remoteTxnEvent.remoteTransaction;
int state = remoteTxn.getState();
TransactionUID tid = remoteTxn.getTid();
if (remoteTxnEvent.getSubType() == RemoteTransactionEvent.Type2PPrepareEvent) {
// 2-phase prepare
// check if it is stored
// (this should only be the case if a failure occurred between saving
// in prepared txn store and resetting the transaction log
if (incompleteStored.containsKey(tid)) {
if (Store.getDEBUG()) {
String msg = getPrefix()
+ " found matching txn in prepared store on replay "
+ remoteTxn;
Globals.getLogger().log(Logger.DEBUG, msg);
}
} else {
addToIncompleteUnstored(remoteTxn);
}
} else if (remoteTxnEvent.getSubType() == RemoteTransactionEvent.Type2PCompleteEvent) {
// we are completing a transaction
// the transaction could be
// a) unstored (prepare replayed earlier)
// b) stored incomplete (prepare occurred before last checkpoint,
// completion not written to prepared store yet)
// This should therefore be the last entry in log.
// c) stored complete (prepare occurred before last checkpoint,
// and failure occurred after completion stored in prepared store
BaseTransaction existingWork = null;
if (incompleteUnstored.containsKey(tid)) {
// a) unstored (prepare replayed earlier)
existingWork = removeFromIncompleteUnstored(tid);
} else if (incompleteStored.containsKey(tid)) {
// b) stored incomplete (prepare occurred before last checkpoint,
// completion not written to prepared store yet)
existingWork = removeFromIncompleteStored(tid);
updateStoredState(tid, state);
addToCompleteStored(existingWork);
} else if (completeStored.containsKey(tid)) {
// c) stored complete (prepare occurred before last checkpoint,
// and failure occurred after completion stored in prepared store
existingWork = completeStored.get(tid);
}
if (existingWork != null) {
RemoteTransaction remoteTransaction = (RemoteTransaction)existingWork;
if (state == TransactionState.COMMITTED) {
TransactionAcknowledgement[] txnAcks = remoteTransaction.getTxnAcks();
DestinationUID[] destIds = remoteTransaction.getDestIds();
transactionLogManager.transactionLogReplayer.replayRemoteAcks(txnAcks, destIds, tid, dstLoadedSet);
}
} else {
logger.log(Logger.ERROR,
"Could not find prepared work for completing two-phase transaction "
+ remoteTxn.getTid());
}
}
}
String getPrefix() {
return "RemoteTransactionManager: " + Thread.currentThread().getName();
}
}