| /* |
| * 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.openjpa.persistence.meta; |
| |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import javax.persistence.EntityManagerFactory; |
| |
| import org.apache.openjpa.meta.MetaDataRepository; |
| import org.apache.openjpa.persistence.OpenJPAEntityManagerFactorySPI; |
| import org.apache.openjpa.persistence.OpenJPAEntityManagerSPI; |
| import org.apache.openjpa.persistence.test.SingleEMFTestCase; |
| |
| public class TestQueryTypeAliasRegistration extends SingleEMFTestCase { |
| private final int threads = 100; |
| |
| @Override |
| public void setUp() throws Exception { |
| super.setUp(MdrTestEntity.class); |
| assertNotNull(emf); |
| // Create the Entity which we're going to try to get MetaData for using |
| // an alias. Do this to ensure that it has been registered to the PCRegistry. |
| new MdrTestEntity(); |
| } |
| |
| /** |
| * This method tests a timing window where more than one thread requests MetaData using an alias |
| * at the same time. All threads should get data back and no threads should receive an |
| * exception. |
| */ |
| public void testMultiThreadGetMetaDataAlias() throws Exception { |
| try { |
| List<Worker> workers = new ArrayList<>(); |
| Set<Exception> exceptions = new HashSet<>(); |
| for (int i = 0; i < threads; i++) { |
| Worker w = new Worker(emf); |
| workers.add(w); |
| } |
| for (Worker w : workers) { |
| w.start(); |
| } |
| for (Worker w : workers) { |
| w.join(); |
| Exception e = w.getException(); |
| if (e != null) { |
| exceptions.add(w.getException()); |
| } |
| } |
| assertTrue("Caught " + exceptions.toString(), exceptions.size() == 0); |
| } finally { |
| if (emf != null) { |
| emf.close(); |
| } |
| } |
| } |
| |
| class Worker extends Thread { |
| OpenJPAEntityManagerFactorySPI emf; |
| OpenJPAEntityManagerSPI em; |
| MetaDataRepository repo; |
| Exception ex; |
| |
| Worker(EntityManagerFactory e) { |
| emf = (OpenJPAEntityManagerFactorySPI) e; |
| // Create an EM here because that triggers registering the MDR as a class registration |
| // listener with the PCRegistry. |
| em = emf.createEntityManager(); |
| repo = em.getConfiguration().getMetaDataRepositoryInstance(); |
| } |
| |
| Exception getException() { |
| return ex; |
| } |
| |
| @Override |
| public void run() { |
| try { |
| repo.getMetaData("MdrTestEntity", Thread.currentThread().getContextClassLoader(), true); |
| } catch (Exception e) { |
| ex = e; |
| e.printStackTrace(); |
| } finally { |
| em.close(); |
| } |
| } |
| } |
| } |