/*
* 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.synapse.mediators.transaction;
import org.apache.synapse.MessageContext;
import org.apache.synapse.SynapseException;
import org.apache.synapse.SynapseLog;
import org.apache.synapse.mediators.AbstractMediator;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.Status;
import javax.transaction.UserTransaction;
/**
* The Mediator for commit, rollback, suspend, resume jta transactions
*/
public class TransactionMediator extends AbstractMediator {
public static final String ACTION_COMMIT = "commit";
public static final String ACTION_ROLLBACK = "rollback";
public static final String ACTION_NEW = "new";
public static final String ACTION_USE_EXISTING_OR_NEW = "use-existing-or-new";
public static final String ACTION_FAULT_IF_NO_TX = "fault-if-no-tx";
private static final String USER_TX_LOOKUP_STR = "java:comp/UserTransaction";
private Context txContext;
private String action = "";
public boolean mediate(MessageContext synCtx) {
UserTransaction tx = null;
final SynapseLog synLog = getLog(synCtx);
if (synLog.isTraceOrDebugEnabled()) {
synLog.traceOrDebug("Start : Transaction mediator (" + action + ")");
if (synLog.isTraceTraceEnabled()) {
synLog.traceTrace("Message : " + synCtx.getEnvelope());
}
}
initContext(synCtx);
try {
tx = (UserTransaction) txContext.lookup(USER_TX_LOOKUP_STR);
} catch (NamingException e) {
handleException("Cloud not get the context name " + USER_TX_LOOKUP_STR, e, synCtx);
}
if (action.equals(ACTION_COMMIT)) {
try {
tx.commit();
} catch (Exception e) {
handleException("Unable to commit transaction", e, synCtx);
}
} else if (action.equals(ACTION_ROLLBACK)) {
try {
tx.rollback();
} catch (Exception e) {
handleException("Unable to rollback transaction", e, synCtx);
}
} else if (action.equals(ACTION_NEW)) {
int status = Status.STATUS_UNKNOWN;
try {
status = tx.getStatus();
} catch (Exception e) {
handleException("Unable to query transaction status", e, synCtx);
}
if (status != Status.STATUS_NO_TRANSACTION) {
throw new SynapseException("Require to begin a new transaction, " +
"but a transaction already exist");
}
try {
tx.begin();
} catch (Exception e) {
handleException("Unable to begin a new transaction", e, synCtx);
}
} else if (action.equals(ACTION_USE_EXISTING_OR_NEW)) {
int status = Status.STATUS_UNKNOWN;
try {
status = tx.getStatus();
} catch (Exception e) {
handleException("Unable to query transaction status", e, synCtx);
}
try {
if (status == Status.STATUS_NO_TRANSACTION) {
tx.begin();
}
} catch (Exception e) {
handleException("Unable to begin a new transaction", e, synCtx);
}
} else if (action.equals(ACTION_FAULT_IF_NO_TX)) {
int status = Status.STATUS_UNKNOWN;
try {
status = tx.getStatus();
} catch (Exception e) {
handleException("Unable to query transaction status", e, synCtx);
}
if (status != Status.STATUS_ACTIVE)
throw new SynapseException("No active transaction. Require an active transaction");
} else {
handleException("Invalid transaction mediator action : " + action, synCtx);
}
if (synLog.isTraceOrDebugEnabled()) {
synLog.traceOrDebug("End : Transaction mediator");
}
return true;
}
public void setAction(String action) {
this.action = action;
}
public String getAction() {
return action;
}
private void initContext(MessageContext synCtx) {
try {
txContext = new InitialContext();
} catch (NamingException e) {
handleException("Cloud not create initial context", e, synCtx);
}
}
}