/*
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* JBoss, Home of Professional Open Source
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* Copyright 2005, JBoss Inc., and individual contributors as indicated
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* by the @authors tag. See the copyright.txt in the distribution for a
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* full listing of individual contributors.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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*/
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package org.jbpm.pvm.internal.tx;
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import javax.transaction.Status;
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import javax.transaction.Transaction;
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import javax.transaction.UserTransaction;
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import org.jbpm.api.JbpmException;
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import org.jbpm.api.cmd.Command;
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import org.jbpm.internal.log.Log;
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import org.jbpm.pvm.internal.env.EnvironmentImpl;
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import org.jbpm.pvm.internal.svc.Interceptor;
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import org.jbpm.pvm.internal.svc.Policy;
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/**
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* @author Tom Baeyens
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*/
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public class JtaTransactionInterceptor extends Interceptor {
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private static Log log = Log.getLog(JtaTransactionInterceptor.class.getName());
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protected Policy policy = Policy.REQUIRES;
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public <T> T execute(Command<T> command) {
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JtaTransaction jtaTransaction = EnvironmentImpl.getFromCurrent(JtaTransaction.class);
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UserTransaction userTransaction = jtaTransaction.lookupJeeUserTransaction();
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int status = JtaTransaction.getUserTransactionStatus(userTransaction);
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if ( (status == Status.STATUS_ACTIVE)
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&& (! (policy==Policy.REQUIRES_NEW))
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) {
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return executeInExistingTx(command);
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}
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if ( (status != Status.STATUS_NO_TRANSACTION)
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&& (status != Status.STATUS_COMMITTED)
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&& (status != Status.STATUS_ROLLEDBACK)
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&& (policy != Policy.REQUIRES_NEW)
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) {
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throw new JbpmException("invalid transaction state: "+JtaStatusHelper.toString(status));
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}
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return executeInNewTx(command, jtaTransaction, status);
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}
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protected <T> T executeInExistingTx(Command<T> command) {
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return next.execute(command);
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}
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protected <T> T executeInNewTx(Command<T> command, JtaTransaction jtaTransaction, int status) {
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Transaction suspendedTransaction = null;
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if ( (status == Status.STATUS_ACTIVE)
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|| (status == Status.STATUS_COMMITTED)
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|| (status == Status.STATUS_ROLLEDBACK)
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) {
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suspendedTransaction = jtaTransaction.suspend();
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}
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T returnValue = null;
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try {
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jtaTransaction.begin();
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returnValue = next.execute(command);
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jtaTransaction.commit();
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} catch (RuntimeException e) {
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jtaTransaction.rollback();
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throw e;
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} finally {
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if (suspendedTransaction!=null) {
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jtaTransaction.resume(suspendedTransaction);
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}
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}
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return returnValue;
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}
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public void setPolicy(Policy policy) {
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this.policy = policy;
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}
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}
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