/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.client.proxy.txn.xa;
import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.client.impl.protocol.codec.XATransactionClearRemoteCodec;
import com.hazelcast.client.impl.protocol.codec.XATransactionCollectTransactionsCodec;
import com.hazelcast.client.impl.protocol.codec.XATransactionFinalizeCodec;
import com.hazelcast.client.spi.ClientContext;
import com.hazelcast.client.spi.ClientProxy;
import com.hazelcast.client.spi.ClientTransactionManagerService;
import com.hazelcast.logging.ILogger;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.transaction.HazelcastXAResource;
import com.hazelcast.transaction.TransactionContext;
import com.hazelcast.transaction.TransactionOptions;
import com.hazelcast.transaction.impl.xa.SerializableXID;
import com.hazelcast.transaction.impl.xa.XAResourceImpl;
import javax.transaction.xa.XAException;
import javax.transaction.xa.XAResource;
import javax.transaction.xa.Xid;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
/**
* Client side XaResource implementation
*/
public class XAResourceProxy extends ClientProxy implements HazelcastXAResource {
private static final int DEFAULT_TIMEOUT_SECONDS = (int) MILLISECONDS.toSeconds(TransactionOptions.DEFAULT_TIMEOUT_MILLIS);
private final ConcurrentMap<Long, TransactionContext> threadContextMap = new ConcurrentHashMap<Long, TransactionContext>();
private final ConcurrentMap<Xid, List<TransactionContext>> xidContextMap
= new ConcurrentHashMap<Xid, List<TransactionContext>>();
private final AtomicInteger timeoutInSeconds = new AtomicInteger(DEFAULT_TIMEOUT_SECONDS);
public XAResourceProxy(String serviceName, String objectName, ClientContext context) {
super(serviceName, objectName, context);
}
@Override
public void start(Xid xid, int flags) throws XAException {
long threadId = currentThreadId();
TransactionContext threadContext = threadContextMap.get(currentThreadId());
switch (flags) {
case TMNOFLAGS:
List<TransactionContext> contexts = new CopyOnWriteArrayList<TransactionContext>();
List<TransactionContext> currentContexts = xidContextMap.putIfAbsent(xid, contexts);
if (currentContexts != null) {
throw new XAException("There is already TransactionContexts for the given xid: " + xid);
}
TransactionContext context = createTransactionContext(xid);
contexts.add(context);
threadContextMap.put(threadId, context);
break;
case TMRESUME:
case TMJOIN:
List<TransactionContext> contextList = xidContextMap.get(xid);
if (contextList == null) {
throw new XAException("There is no TransactionContexts for the given xid: " + xid);
}
if (threadContext == null) {
threadContext = createTransactionContext(xid);
threadContextMap.put(threadId, threadContext);
contextList.add(threadContext);
}
break;
default:
throw new XAException("Unknown flag!" + flags);
}
}
private TransactionContext createTransactionContext(Xid xid) {
ClientTransactionManagerService transactionManager = getContext().getTransactionManager();
TransactionContext context = transactionManager.newXATransactionContext(xid, timeoutInSeconds.get());
getTransaction(context).begin();
return context;
}
@Override
public void end(Xid xid, int flags) throws XAException {
long threadId = currentThreadId();
TransactionContext threadContext = threadContextMap.remove(threadId);
ILogger logger = getContext().getLoggingService().getLogger(this.getClass());
if (threadContext == null && logger.isFinestEnabled()) {
logger.finest("There is no TransactionContext for the current thread: " + threadId);
}
List<TransactionContext> contexts = xidContextMap.get(xid);
if (contexts == null && logger.isFinestEnabled()) {
logger.finest("There is no TransactionContexts for the given xid: " + xid);
}
}
@Override
public int prepare(Xid xid) throws XAException {
List<TransactionContext> contexts = xidContextMap.get(xid);
if (contexts == null) {
throw new XAException("There is no TransactionContexts for the given xid: " + xid);
}
for (TransactionContext context : contexts) {
XATransactionProxy transaction = getTransaction(context);
transaction.prepare();
}
return XA_OK;
}
@Override
public void commit(Xid xid, boolean onePhase) throws XAException {
List<TransactionContext> contexts = xidContextMap.remove(xid);
if (contexts == null && onePhase) {
throw new XAException("There is no TransactionContexts for the given xid: " + xid);
}
if (contexts == null) {
finalizeTransactionRemotely(xid, true);
return;
}
for (TransactionContext context : contexts) {
XATransactionProxy transaction = getTransaction(context);
transaction.commit(onePhase);
}
clearRemoteTransactions(xid);
}
@Override
public void rollback(Xid xid) throws XAException {
List<TransactionContext> contexts = xidContextMap.remove(xid);
if (contexts == null) {
finalizeTransactionRemotely(xid, false);
return;
}
for (TransactionContext context : contexts) {
getTransaction(context).rollback();
}
clearRemoteTransactions(xid);
}
private void finalizeTransactionRemotely(Xid xid, boolean isCommit) {
SerializableXID serializableXID = new SerializableXID(xid.getFormatId(), xid.getGlobalTransactionId(),
xid.getBranchQualifier());
Data xidData = toData(serializableXID);
ClientMessage request = XATransactionFinalizeCodec.encodeRequest(serializableXID, isCommit);
invoke(request, xidData);
}
@Override
public void forget(Xid xid) throws XAException {
List<TransactionContext> contexts = xidContextMap.remove(xid);
if (contexts == null) {
throw new XAException("No context with the given xid: " + xid);
}
clearRemoteTransactions(xid);
}
private void clearRemoteTransactions(Xid xid) {
SerializableXID serializableXID = new SerializableXID(xid.getFormatId(), xid.getGlobalTransactionId(),
xid.getBranchQualifier());
Data xidData = toData(serializableXID);
ClientMessage request = XATransactionClearRemoteCodec.encodeRequest(serializableXID);
invoke(request, xidData);
}
@Override
public boolean isSameRM(XAResource xaResource) throws XAException {
if (this == xaResource) {
return true;
}
String otherGroupName = null;
if (xaResource instanceof XAResourceProxy) {
otherGroupName = ((XAResourceProxy) xaResource).getGroupName();
}
if (xaResource instanceof XAResourceImpl) {
otherGroupName = ((XAResourceImpl) xaResource).getGroupName();
}
return getGroupName().equals(otherGroupName);
}
@Override
public Xid[] recover(int flag) throws XAException {
ClientMessage request = XATransactionCollectTransactionsCodec.encodeRequest();
ClientMessage response = invoke(request);
Collection<Data> list = XATransactionCollectTransactionsCodec.decodeResponse(response).response;
SerializableXID[] xidArray = new SerializableXID[list.size()];
int index = 0;
for (Data xidData : list) {
xidArray[index++] = toObject(xidData);
}
return xidArray;
}
@Override
public int getTransactionTimeout() throws XAException {
return timeoutInSeconds.get();
}
@Override
public boolean setTransactionTimeout(int seconds) throws XAException {
timeoutInSeconds.set(seconds == 0 ? DEFAULT_TIMEOUT_SECONDS : seconds);
return true;
}
@Override
public TransactionContext getTransactionContext() {
long threadId = Thread.currentThread().getId();
return threadContextMap.get(threadId);
}
private XATransactionProxy getTransaction(TransactionContext context) {
return ((XATransactionContextProxy) context).getTransaction();
}
private long currentThreadId() {
return Thread.currentThread().getId();
}
private String getGroupName() {
ClientTransactionManagerService transactionManager = getContext().getTransactionManager();
return transactionManager.getGroupName();
}
@Override
public String toString() {
return "HazelcastXaResource{" + getGroupName() + '}';
}
}