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/**
* Copyright (C) 2000-2010 Atomikos
*
* This code ("Atomikos TransactionsEssentials"), by itself,
* is being distributed under the
* Apache License, Version 2.0 ("License"), a copy of which may be found at
* http://www.atomikos.com/licenses/apache-license-2.0.txt .
* You may not use this file except in compliance with the License.
*
* While the License grants certain patent license rights,
* those patent license rights only extend to the use of
* Atomikos TransactionsEssentials by itself.
*
* This code (Atomikos TransactionsEssentials) contains certain interfaces
* in package (namespace) com.atomikos.icatch
* (including com.atomikos.icatch.Participant) which, if implemented, may
* infringe one or more patents held by Atomikos.
* It should be appreciated that you may NOT implement such interfaces;
* licensing to implement these interfaces must be obtained separately from Atomikos.
*
* 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.
*/
package com.atomikos.icatch.jta;
import java.io.Serializable;
import javax.naming.NamingException;
import javax.naming.Reference;
import javax.naming.Referenceable;
import javax.transaction.HeuristicMixedException;
import javax.transaction.HeuristicRollbackException;
import javax.transaction.InvalidTransactionException;
import javax.transaction.NotSupportedException;
import javax.transaction.RollbackException;
import javax.transaction.SystemException;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import javax.transaction.UserTransaction;
import com.atomikos.icatch.config.UserTransactionServiceImp;
import com.atomikos.util.SerializableObjectFactory;
/**
* A straightforward, zero-setup implementation of a transaction manager.
* Applications can use an instance of this class to get a handle to the
* transaction manager, and automatically startup or recover the transaction
* service on first use.
*/
public class UserTransactionManager implements TransactionManager,
Serializable, Referenceable, UserTransaction
{
private static final long serialVersionUID = -655789038710288096L;
private transient TransactionManagerImp tm;
private UserTransactionServiceImp uts;
private boolean forceShutdown;
private boolean startupTransactionService;
private boolean closed;
private void checkSetup () throws SystemException
{
if ( closed ) throw new SystemException ( "This UserTransactionManager instance was closed already. Call init() to reuse if desired." );
if ( tm == null ) { // case 75549: avoid synch overhead if already initialized
synchronized ( TransactionManagerImp.class ) {
tm = (TransactionManagerImp) TransactionManagerImp
.getTransactionManager ();
if ( tm == null ) {
if ( getStartupTransactionService() ) {
startupTransactionService();
}
else {
throw new SystemException ( "Transaction service not running" );
}
}
}
}
}
private void startupTransactionService() {
uts = new UserTransactionServiceImp ();
uts.init();
tm = (TransactionManagerImp) TransactionManagerImp
.getTransactionManager ();
}
private void shutdownTransactionService() {
if ( uts != null ) { // null if we did not start core here
uts.shutdown ( forceShutdown );
uts = null;
}
}
public UserTransactionManager()
{
//startup by default, to have backward compatibility
this.startupTransactionService = true;
this.closed = false;
}
/**
* Sets whether the transaction service should be
* started if not already running. Optional, defaults to true.
*
* @param startup
*/
public void setStartupTransactionService ( boolean startup )
{
this.startupTransactionService = startup;
}
/**
* Returns true if the transaction service will
* be started if not already running.
* @return
*/
public boolean getStartupTransactionService()
{
return this.startupTransactionService;
}
/**
* Performs initialization if necessary.
* This will startup the TM (if not running)
* and perform recovery, unless getStartupTransactionService
* returns false.
*
* @throws SystemException
*/
public void init() throws SystemException
{
closed = false;
checkSetup();
}
/**
* @see javax.transaction.TransactionManager#begin()
*/
public void begin () throws NotSupportedException, SystemException
{
checkSetup ();
tm.begin ();
}
public boolean getForceShutdown()
{
return forceShutdown;
}
/**
* Sets the force shutdown mode to use during close.
* @param value
*/
public void setForceShutdown ( boolean value )
{
this.forceShutdown = value;
}
/**
* @see javax.transaction.TransactionManager#commit()
*/
public void commit () throws RollbackException, HeuristicMixedException,
HeuristicRollbackException, SecurityException,
IllegalStateException, SystemException
{
checkSetup ();
tm.commit ();
}
/**
* @see javax.transaction.TransactionManager#getStatus()
*/
public int getStatus () throws SystemException
{
checkSetup ();
return tm.getStatus ();
}
/**
* @see javax.transaction.TransactionManager#getTransaction()
*/
public Transaction getTransaction () throws SystemException
{
checkSetup ();
return tm.getTransaction ();
}
/**
* @see javax.transaction.TransactionManager#resume(javax.transaction.Transaction)
*/
public void resume ( Transaction tx ) throws InvalidTransactionException,
IllegalStateException, SystemException
{
checkSetup ();
tm.resume ( tx );
}
/**
* @see javax.transaction.TransactionManager#rollback()
*/
public void rollback () throws IllegalStateException, SecurityException,
SystemException
{
checkSetup ();
tm.rollback ();
}
/**
* @see javax.transaction.TransactionManager#setRollbackOnly()
*/
public void setRollbackOnly () throws IllegalStateException,
SystemException
{
checkSetup ();
tm.setRollbackOnly ();
}
/**
* @see javax.transaction.TransactionManager#setTransactionTimeout(int)
*/
public void setTransactionTimeout ( int secs ) throws SystemException
{
checkSetup ();
tm.setTransactionTimeout ( secs );
}
/**
* @see javax.transaction.TransactionManager#suspend()
*/
public Transaction suspend () throws SystemException
{
checkSetup ();
return tm.suspend ();
}
/**
* @see javax.naming.Referenceable#getReference()
*/
public Reference getReference () throws NamingException
{
return SerializableObjectFactory.createReference ( this );
}
/**
* Closes the transaction service, but only if it was
* implicitly started via this instance.
* In other words, if the transaction service was started
* in another way then this method will not do anything.
*
*/
public void close()
{
shutdownTransactionService();
closed = true;
}
}
