| /* |
| * 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 WARRANTIESOR 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.aries.tx.control.jpa.xa.impl; |
| |
| import java.util.function.Function; |
| |
| import javax.persistence.EntityManager; |
| |
| import org.apache.aries.tx.control.jpa.common.impl.AbstractJPAEntityManagerProvider; |
| import org.osgi.service.transaction.control.TransactionControl; |
| import org.osgi.service.transaction.control.TransactionException; |
| |
| public class DelayedJPAEntityManagerProvider extends AbstractJPAEntityManagerProvider { |
| |
| private final Function<ThreadLocal<TransactionControl>, AbstractJPAEntityManagerProvider> wireToTransactionControl; |
| |
| private final ThreadLocal<TransactionControl> commonStore = new ThreadLocal<>(); |
| |
| private AbstractJPAEntityManagerProvider delegate; |
| |
| private boolean closed; |
| |
| public DelayedJPAEntityManagerProvider(Function<ThreadLocal<TransactionControl>, |
| AbstractJPAEntityManagerProvider> wireToTransactionControl) { |
| super(null, null); |
| this.wireToTransactionControl = wireToTransactionControl; |
| } |
| |
| @Override |
| public EntityManager getResource(TransactionControl txControl) throws TransactionException { |
| synchronized (wireToTransactionControl) { |
| if(closed) { |
| throw new IllegalStateException("This XA JPA resource provider has been closed"); |
| } |
| if(delegate == null) { |
| commonStore.set(txControl); |
| delegate = wireToTransactionControl.apply(commonStore); |
| } |
| } |
| return delegate.getResource(txControl); |
| } |
| |
| public void close() { |
| AbstractJPAEntityManagerProvider toClose = null; |
| synchronized (wireToTransactionControl) { |
| if(!closed) { |
| closed = true; |
| toClose = delegate; |
| delegate = null; |
| } |
| } |
| |
| if(toClose != null) { |
| toClose.close(); |
| } |
| } |
| |
| } |