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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.BrokerAddress;
import com.sun.messaging.jmq.jmsserver.data.BaseTransaction;
import com.sun.messaging.jmq.jmsserver.data.ClusterTransaction;
import com.sun.messaging.jmq.jmsserver.data.TransactionBroker;
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 ClusterTransactionManager extends BaseTransactionManager {
ClusterTransactionManager(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()) {
String msg = getPrefix() + " generateEvent " + baseTxn;
logger.log(Logger.DEBUG, msg);
}
ClusterTransactionEvent result = null;
if(completion)
{
result = new ClusterTransaction2PCompleteEvent();
}
else if (baseTxn.getState() == TransactionState.PREPARED) {
result = new ClusterTransaction2PPrepareEvent();
} else {
// TO DO FILL IN HERE
throw new UnsupportedOperationException();
}
result.clusterTransaction = (ClusterTransaction) 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()) {
String msg = getPrefix() + " processTxnCompletion " + tid;
logger.log(Logger.DEBUG, msg);
}
// We are committing a prepared cluster entry.
// Check if it is in the prepared transaction store
// If it is mark it as committed
// Do NOT remove from prepared store until all participating
// brokers in cluster have committed
boolean removeFromStore = false;
return processTxnCompletion(tid, state, removeFromStore);
}
void updateTransactionBrokerState(TransactionUID tid, int expectedTxnState,
TransactionBroker txnBkr, boolean sync) throws BrokerException {
if (Store.getDEBUG()) {
String msg = getPrefix() + " updateTransactionBrokerState: tx = " + tid
+ " txnBkr=" + txnBkr;
Globals.getLogger().log(Logger.DEBUG, msg);
}
// store txnBroker state update in txn log
// if txn is complete then mark this also
// clustered txnUpdate record
// TO DO
//first look in unstored
ClusterTransaction clusterTxn = null;
boolean stored = false;
clusterTxn = (ClusterTransaction) incompleteUnstored.get(tid);
if (clusterTxn == null) {
clusterTxn = (ClusterTransaction) incompleteStored.get(tid);
if (clusterTxn != null)
stored = true;
}
if (clusterTxn != null) {
boolean allComplete = updateTransactionBrokerState(txnBkr,
clusterTxn);
if (Store.getDEBUG()) {
Globals.getLogger().log(Logger.DEBUG, getPrefix() + " allComplete: = " + allComplete);
}
if (allComplete) {
clusterTxn.getTransactionDetails().setComplete(true);
if (!stored) {
removeFromIncompleteUnstored(tid);
} else {
removeFromIncompleteStored(tid);
addToCompleteStored(clusterTxn);
try {
this.updateStoredCompletion(tid, true);
} catch (IOException ioe) {
throw new BrokerException(
"Could not update completion state of stored cluster transaction "
+ tid, ioe);
}
}
}
} else {
logger.log(Logger.ERROR,
"Could not find matching cluster transaction for " + tid);
}
}
boolean updateTransactionBrokerState(TransactionBroker txnBkr,
ClusterTransaction clusterTxn) {
TransactionBroker[] txnBrokers = clusterTxn.getTransactionBrokers();
TransactionBroker result = null;
BrokerAddress b = txnBkr.getBrokerAddress();
boolean allComplete = true;
for (int i = 0; i < txnBrokers.length; i++) {
BrokerAddress ba = txnBrokers[i].getCurrentBrokerAddress();
if (ba == null)
continue;
if (ba.equals(b))
result = txnBrokers[i];
else {
allComplete &= txnBrokers[i].isCompleted();
}
}
result.setCompleted(true);
return allComplete;
}
void replayTransactionEvent(TransactionEvent txnEvent, HashSet dstLoadedSet)
throws BrokerException, IOException {
if (Store.getDEBUG()) {
Globals.getLogger().log(Logger.DEBUG,
getPrefix() + " replayTransactionEvent");
}
ClusterTransactionEvent clusterTxnEvent = (ClusterTransactionEvent) txnEvent;
// replay to store on commit
ClusterTransaction clusterTxn = clusterTxnEvent.clusterTransaction;
int state = clusterTxn.getState();
TransactionUID tid = clusterTxn.getTid();
if (clusterTxnEvent.getSubType() == ClusterTransactionEvent.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 "
+ clusterTxn;
Globals.getLogger().log(Logger.DEBUG, msg);
}
} else {
addToIncompleteUnstored(clusterTxn);
}
} else if (clusterTxnEvent.getSubType() == ClusterTransactionEvent.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)
if (state == TransactionState.ROLLEDBACK) {
existingWork = removeFromIncompleteUnstored(tid);
} else if (state == TransactionState.COMMITTED) {
existingWork = incompleteUnstored.get(tid);
existingWork.getTransactionDetails().setState(state);
existingWork.getTransactionState().setState(state);
}
} 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) {
if (state == TransactionState.COMMITTED) {
transactionLogManager.transactionLogReplayer.replayTransactionWork(existingWork
.getTransactionWork(), tid, dstLoadedSet);
}
} else {
logger.log(Logger.ERROR,
"Could not find prepared work for completing two-phase transaction "
+ clusterTxn.getTid());
}
}
}
String getPrefix() {
return "ClusterTransactionManager: " + Thread.currentThread().getName();
}
}
