gistfile1.java

/*
 * 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.deltaspike.jpa.impl.transaction;

import org.apache.deltaspike.jpa.spi.transaction.TransactionStrategy;

import javax.enterprise.context.Dependent;
import javax.enterprise.inject.Alternative;
import javax.interceptor.InvocationContext;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.Status;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import java.lang.reflect.Method;

/**
 * <p>{@link org.apache.deltaspike.jpa.spi.transaction.TransactionStrategy} for using JTA transactions.
 */
@Dependent
@Alternative
@SuppressWarnings("UnusedDeclaration")
//TODO move to a separated ds-jta module and use @Specializes -> no additional config is needed
public class TransactionManagerTransactionStrategy implements TransactionStrategy
{
    private static final String [] JNDI_LOCS = new String []{
        "javax.transaction.TransactionManager", // weblogic
        "java:/TransactionManager", // jboss, jrun, Geronimo
        "java:/DefaultDomain/TransactionManager", // jrun too
        "java:comp/pm/TransactionManager", // orion & oracle
        "java:comp/TransactionManager", // generic
        "java:appserver/TransactionManager", // GlassFish
        "java:pm/TransactionManager", // borland
        "aries:services/javax.transaction.TransactionManager", // Apache Aries
    };
    private static final String [] METHODS = new String[]{
        "com.arjuna.jta.JTA_TransactionManager.transactionManager", // hp
        "com.bluestone.jta.SaTransactionManagerFactory.SaGetTransactionManager",
        "org.openejb.OpenEJB.getTransactionManager",
        "com.sun.jts.jta.TransactionManagerImpl.getTransactionManagerImpl",
        "com.inprise.visitransact.jta.TransactionManagerImpl."
            + "getTransactionManagerImpl", // borland
    };

    private static volatile TransactionManager transactionManager = null;
    static
    {
        try
        {
            initTransactionManager();
        }
        catch (final IllegalStateException ise)
        {
            // no-op: try lazily
        }
    }

    @Override
    public Object execute(final InvocationContext invocationContext) throws Exception
    {
        boolean responsible = false;

        Transaction tx = initTransactionManager().getTransaction();
        if (tx == null)
        {
            transactionManager.begin();
            tx = transactionManager.getTransaction();
            responsible = true;
        }

        try
        {
            return invocationContext.proceed();
        }
        catch (final Exception th)
        {
            if (responsible)
            {
                tx.rollback();
            }
            throw th;
        }
        finally
        {
            if (responsible)
            {
                if (tx.getStatus() == Status.STATUS_ACTIVE)
                {
                    tx.commit();
                }
                else
                {
                    tx.rollback();
                }
            }
        }
    }

    private static TransactionManager initTransactionManager() {
        if (TransactionManagerTransactionStrategy.transactionManager != null)
        {
            return TransactionManagerTransactionStrategy.transactionManager;
        }

        TransactionManager transactionManager = null;

        // try to find a jndi runtime
        try {
            final InitialContext context = new InitialContext();
            for (final String jndi : JNDI_LOCS) {
                try {
                    transactionManager = TransactionManager.class.cast(context.lookup(jndi));
                } catch (final Throwable t) {
                    // no-op
                }
                if (transactionManager != null) {
                    break;
                }
            }
        } catch (final NamingException ne) {
            // no-op
        }

        // look for a method runtime
        if (transactionManager == null) {
            for (final String method : METHODS) {
                final String clazz = method.substring(0, method.lastIndexOf('.'));
                final String methodName = method.substring(method.lastIndexOf('.') + 1);
                try {
                    final ClassLoader tccl = Thread.currentThread().getContextClassLoader();
                    final Method mtd = Class.forName(clazz, true, tccl).getMethod(methodName);
                    transactionManager = TransactionManager.class.cast(mtd.invoke(null));
                } catch (final Throwable t) {
                    // no-op
                }
                if (transactionManager != null) {
                    break;
                }
            }
        }

        if (transactionManager == null)
        {
            throw new IllegalStateException("Can't find any transaction manager");
        }
        if (TransactionManagerTransactionStrategy.transactionManager == null)
        {
            TransactionManagerTransactionStrategy.transactionManager = transactionManager;
        }
        return transactionManager;
    }
}