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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.broker;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.jms.JMSException;
import javax.jms.ResourceAllocationException;
import javax.transaction.xa.XAException;
import org.apache.activemq.broker.jmx.ManagedRegionBroker;
import org.apache.activemq.broker.region.Destination;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.BaseCommand;
import org.apache.activemq.command.ConnectionInfo;
import org.apache.activemq.command.LocalTransactionId;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.ProducerInfo;
import org.apache.activemq.command.TransactionId;
import org.apache.activemq.command.XATransactionId;
import org.apache.activemq.state.ProducerState;
import org.apache.activemq.store.TransactionRecoveryListener;
import org.apache.activemq.store.TransactionStore;
import org.apache.activemq.transaction.LocalTransaction;
import org.apache.activemq.transaction.Synchronization;
import org.apache.activemq.transaction.Transaction;
import org.apache.activemq.transaction.XATransaction;
import org.apache.activemq.util.IOExceptionSupport;
import org.apache.activemq.util.WrappedException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This broker filter handles the transaction related operations in the Broker
* interface.
*
*
*/
public class TransactionBroker extends BrokerFilter {
private static final Logger LOG = LoggerFactory.getLogger(TransactionBroker.class);
// The prepared XA transactions.
private TransactionStore transactionStore;
private Map xaTransactions = new LinkedHashMap();
final ConnectionContext context = new ConnectionContext();
public TransactionBroker(Broker next, TransactionStore transactionStore) {
super(next);
this.transactionStore = transactionStore;
}
// ////////////////////////////////////////////////////////////////////////////
//
// Life cycle Methods
//
// ////////////////////////////////////////////////////////////////////////////
/**
* Recovers any prepared transactions.
*/
public void start() throws Exception {
transactionStore.start();
try {
context.setBroker(this);
context.setInRecoveryMode(true);
context.setTransactions(new ConcurrentHashMap());
context.setProducerFlowControl(false);
final ProducerBrokerExchange producerExchange = new ProducerBrokerExchange();
producerExchange.setMutable(true);
producerExchange.setConnectionContext(context);
producerExchange.setProducerState(new ProducerState(new ProducerInfo()));
final ConsumerBrokerExchange consumerExchange = new ConsumerBrokerExchange();
consumerExchange.setConnectionContext(context);
transactionStore.recover(new TransactionRecoveryListener() {
public void recover(XATransactionId xid, Message[] addedMessages, MessageAck[] aks) {
try {
beginTransaction(context, xid);
XATransaction transaction = (XATransaction) getTransaction(context, xid, false);
for (int i = 0; i < addedMessages.length; i++) {
forceDestinationWakeupOnCompletion(context, transaction, addedMessages[i].getDestination(), addedMessages[i]);
}
for (int i = 0; i < aks.length; i++) {
forceDestinationWakeupOnCompletion(context, transaction, aks[i].getDestination(), aks[i]);
}
transaction.setState(Transaction.PREPARED_STATE);
registerMBean(transaction);
LOG.debug("recovered prepared transaction: {}", transaction.getTransactionId());
} catch (Throwable e) {
throw new WrappedException(e);
}
}
});
} catch (WrappedException e) {
Throwable cause = e.getCause();
throw IOExceptionSupport.create("Recovery Failed: " + cause.getMessage(), cause);
}
next.start();
}
private void registerMBean(XATransaction transaction) {
if (getBrokerService().getRegionBroker() instanceof ManagedRegionBroker ) {
ManagedRegionBroker managedRegionBroker = (ManagedRegionBroker) getBrokerService().getRegionBroker();
managedRegionBroker.registerRecoveredTransactionMBean(transaction);
}
}
private void forceDestinationWakeupOnCompletion(ConnectionContext context, Transaction transaction,
ActiveMQDestination amqDestination, BaseCommand ack) throws Exception {
registerSync(amqDestination, transaction, ack);
}
private void registerSync(ActiveMQDestination destination, Transaction transaction, BaseCommand command) {
Synchronization sync = new PreparedDestinationCompletion(this, destination, command.isMessage());
// ensure one per destination in the list
Synchronization existing = transaction.findMatching(sync);
if (existing != null) {
((PreparedDestinationCompletion)existing).incrementOpCount();
} else {
transaction.addSynchronization(sync);
}
}
static class PreparedDestinationCompletion extends Synchronization {
private final TransactionBroker transactionBroker;
final ActiveMQDestination destination;
final boolean messageSend;
int opCount = 1;
public PreparedDestinationCompletion(final TransactionBroker transactionBroker, ActiveMQDestination destination, boolean messageSend) {
this.transactionBroker = transactionBroker;
this.destination = destination;
// rollback relevant to acks, commit to sends
this.messageSend = messageSend;
}
public void incrementOpCount() {
opCount++;
}
@Override
public int hashCode() {
return System.identityHashCode(destination) +
System.identityHashCode(Boolean.valueOf(messageSend));
}
@Override
public boolean equals(Object other) {
return other instanceof PreparedDestinationCompletion &&
destination.equals(((PreparedDestinationCompletion) other).destination) &&
messageSend == ((PreparedDestinationCompletion) other).messageSend;
}
@Override
public void afterRollback() throws Exception {
if (!messageSend) {
Destination dest = transactionBroker.addDestination(transactionBroker.context, destination, false);
dest.clearPendingMessages(opCount);
dest.getDestinationStatistics().getMessages().add(opCount);
LOG.debug("cleared pending from afterRollback: {}", destination);
}
}
@Override
public void afterCommit() throws Exception {
Destination dest = transactionBroker.addDestination(transactionBroker.context, destination, false);
if (messageSend) {
dest.clearPendingMessages(opCount);
dest.getDestinationStatistics().getEnqueues().add(opCount);
dest.getDestinationStatistics().getMessages().add(opCount);
LOG.debug("cleared pending from afterCommit: {}", destination);
} else {
dest.getDestinationStatistics().getDequeues().add(opCount);
}
}
}
public void stop() throws Exception {
transactionStore.stop();
next.stop();
}
// ////////////////////////////////////////////////////////////////////////////
//
// BrokerFilter overrides
//
// ////////////////////////////////////////////////////////////////////////////
public TransactionId[] getPreparedTransactions(ConnectionContext context) throws Exception {
List txs = new ArrayList();
synchronized (xaTransactions) {
for (Iterator iter = xaTransactions.values().iterator(); iter.hasNext();) {
Transaction tx = iter.next();
if (tx.isPrepared()) {
LOG.debug("prepared transaction: {}", tx.getTransactionId());
txs.add(tx.getTransactionId());
}
}
}
XATransactionId rc[] = new XATransactionId[txs.size()];
txs.toArray(rc);
LOG.debug("prepared transaction list size: {}", rc.length);
return rc;
}
public void beginTransaction(ConnectionContext context, TransactionId xid) throws Exception {
// the transaction may have already been started.
if (xid.isXATransaction()) {
XATransaction transaction = null;
synchronized (xaTransactions) {
transaction = xaTransactions.get(xid);
if (transaction != null) {
return;
}
transaction = new XATransaction(transactionStore, (XATransactionId)xid, this, context.getConnectionId());
xaTransactions.put(xid, transaction);
}
} else {
Map transactionMap = context.getTransactions();
Transaction transaction = transactionMap.get(xid);
if (transaction != null) {
throw new JMSException("Transaction '" + xid + "' has already been started.");
}
transaction = new LocalTransaction(transactionStore, (LocalTransactionId)xid, context);
transactionMap.put(xid, transaction);
}
}
public int prepareTransaction(ConnectionContext context, TransactionId xid) throws Exception {
Transaction transaction = getTransaction(context, xid, false);
return transaction.prepare();
}
public void commitTransaction(ConnectionContext context, TransactionId xid, boolean onePhase) throws Exception {
Transaction transaction = getTransaction(context, xid, true);
transaction.commit(onePhase);
}
public void rollbackTransaction(ConnectionContext context, TransactionId xid) throws Exception {
Transaction transaction = getTransaction(context, xid, true);
transaction.rollback();
}
public void forgetTransaction(ConnectionContext context, TransactionId xid) throws Exception {
Transaction transaction = getTransaction(context, xid, true);
transaction.rollback();
}
public void acknowledge(ConsumerBrokerExchange consumerExchange, MessageAck ack) throws Exception {
// This method may be invoked recursively.
// Track original tx so that it can be restored.
final ConnectionContext context = consumerExchange.getConnectionContext();
Transaction originalTx = context.getTransaction();
Transaction transaction = null;
if (ack.isInTransaction()) {
transaction = getTransaction(context, ack.getTransactionId(), false);
}
context.setTransaction(transaction);
try {
next.acknowledge(consumerExchange, ack);
} finally {
context.setTransaction(originalTx);
}
}
public void send(ProducerBrokerExchange producerExchange, final Message message) throws Exception {
// This method may be invoked recursively.
// Track original tx so that it can be restored.
final ConnectionContext context = producerExchange.getConnectionContext();
Transaction originalTx = context.getTransaction();
Transaction transaction = null;
if (message.getTransactionId() != null) {
transaction = getTransaction(context, message.getTransactionId(), false);
}
context.setTransaction(transaction);
try {
// [AMQ-9344] Limit uncommitted transactions by count
verifyUncommittedCount(producerExchange, transaction, message);
next.send(producerExchange, message);
} finally {
context.setTransaction(originalTx);
}
}
protected void verifyUncommittedCount(ProducerBrokerExchange producerExchange, Transaction transaction, Message message) throws Exception {
// maxUncommittedCount <= 0 disables
int maxUncommittedCount = this.getBrokerService().getMaxUncommittedCount();
if (maxUncommittedCount > 0 && transaction.size() >= maxUncommittedCount) {
try {
// Rollback as we are throwing an error the client as throwing the error will cause
// the client to reset to a new transaction so we need to clean up
transaction.rollback();
// Send ResourceAllocationException which will translate to a JMSException
final ResourceAllocationException e = new ResourceAllocationException(
"Can not send message on transaction with id: '" + transaction.getTransactionId().toString()
+ "', Transaction has reached the maximum allowed number of pending send operations before commit of '"
+ maxUncommittedCount + "'", "42900");
LOG.warn("ConnectionId:{} exceeded maxUncommittedCount:{} for destination:{} in transactionId:{}", (producerExchange.getConnectionContext() != null ? producerExchange.getConnectionContext().getConnectionId() : ""), maxUncommittedCount, message.getDestination().getQualifiedName(), transaction.getTransactionId().toString());
throw e;
} finally {
producerExchange.getRegionDestination().getDestinationStatistics().getMaxUncommittedExceededCount().increment();
}
}
}
public void removeConnection(ConnectionContext context, ConnectionInfo info, Throwable error) throws Exception {
for (Iterator iter = context.getTransactions().values().iterator(); iter.hasNext();) {
try {
Transaction transaction = iter.next();
transaction.rollback();
} catch (Exception e) {
LOG.warn("ERROR Rolling back disconnected client's transactions: ", e);
}
iter.remove();
}
synchronized (xaTransactions) {
// first find all txs that belongs to the connection
ArrayList txs = new ArrayList();
for (XATransaction tx : xaTransactions.values()) {
if (tx.getConnectionId() != null && tx.getConnectionId().equals(info.getConnectionId()) && !tx.isPrepared()) {
txs.add(tx);
}
}
// then remove them
// two steps needed to avoid ConcurrentModificationException, from removeTransaction()
for (XATransaction tx : txs) {
try {
tx.rollback();
} catch (Exception e) {
LOG.warn("ERROR Rolling back disconnected client's xa transactions: ", e);
}
}
}
next.removeConnection(context, info, error);
}
// ////////////////////////////////////////////////////////////////////////////
//
// Implementation help methods.
//
// ////////////////////////////////////////////////////////////////////////////
public Transaction getTransaction(ConnectionContext context, TransactionId xid, boolean mightBePrepared) throws JMSException, XAException {
Transaction transaction = null;
if (xid.isXATransaction()) {
synchronized (xaTransactions) {
transaction = xaTransactions.get(xid);
}
} else {
transaction = context.getTransactions().get(xid);
}
if (transaction != null) {
return transaction;
}
if (xid.isXATransaction()) {
XAException e = XATransaction.newXAException("Transaction '" + xid + "' has not been started.", XAException.XAER_NOTA);
throw e;
} else {
throw new JMSException("Transaction '" + xid + "' has not been started.");
}
}
public void removeTransaction(XATransactionId xid) {
synchronized (xaTransactions) {
xaTransactions.remove(xid);
}
}
}
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