TxSupports.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.openejb.core.transaction;

import org.apache.openejb.SystemException;

import javax.transaction.Transaction;
import javax.transaction.TransactionManager;

/**
 * 17.6.2.3 Supports
 * <p/>
 * The Container invokes an enterprise Bean method whose transaction attribute
 * is set to Supports as follows.
 * <p/>
 * If the client calls with a transaction context, the Container performs the
 * same steps as described in the Required case.
 * <p/>
 * If the client calls without a transaction context, the Container performs the
 * same steps as described in the NotSupported case.
 * <p/>
 * The Supports transaction attribute must be used with caution. This is because
 * of the different transactional semantics provided by the two possible modes
 * of execution. Only the enterprise beans that will execute correctly in both
 * modes should use the Supports transaction attribute.
 */
public class TxSupports extends JtaTransactionPolicy {
    private final Transaction clientTx;

    public TxSupports(final TransactionManager transactionManager) throws SystemException {
        super(TransactionType.Supports, transactionManager);

        clientTx = getTransaction();
    }

    public boolean isNewTransaction() {
        return false;
    }

    public boolean isClientTransaction() {
        return clientTx != null;
    }

    public Transaction getCurrentTransaction() {
        return clientTx;
    }

    public void commit() {
        fireNonTransactionalCompletion();
    }
}