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  * JBoss, Home of Professional Open Source
  * Copyright 2006, Red Hat Middleware LLC, and individual contributors 
  * as indicated by the @author tags. 
  * See the copyright.txt in the distribution for a
  * full listing of individual contributors. 
  * This copyrighted material is made available to anyone wishing to use,
  * modify, copy, or redistribute it subject to the terms and conditions
  * of the GNU Lesser General Public License, v. 2.1.
 * This program is distributed in the hope that it will be useful, but WITHOUT A 
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A 
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public License,
 * v.2.1 along with this distribution; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
 * MA  02110-1301, USA.
 * (C) 2005-2006,
 * @author JBoss Inc.
 * Copyright (C) 2005,
 * Arjuna Technologies Ltd,
 * Newcastle upon Tyne,
 * Tyne and Wear,
 * UK.
 * $Id: 2342 2006-03-30 13:06:17Z  $
package com.arjuna.ats.internal.jta.transaction.arjunacore.jca;
import  javax.transaction.Transaction;

Register a single instance of this thing when the first JCA worker is imported. Not before. It needs to tidy-up any Worker-to-transaction associations and to tear down any other transaction-specific data that we may be holding (e.g., TxWorkers).

public class WorkSynchronization implements javax.transaction.Synchronization
	public WorkSynchronization (Transaction current)
		 = current;

If the current transaction still has work associated with it, then we need to throw an exception. This will cause the current transaction to rollback.
	public void beforeCompletion ()
		// check no work associated with transaction
			if (TxWorkManager.hasWork())
				 * JBoss way of doing things is broken: they
				 * throw IllegalStateException in an invalid manner
				 * (see JTA spec.) and don't force the transaction to
				 * rollback.
				throw new IllegalStateException();
			throw ex;
			 = null;

A null-op.
	public void afterCompletion (int status)
		// do nothing
	private Transaction _current;
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