| /* |
| * 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.slice; |
| |
| import java.util.List; |
| import java.util.Random; |
| |
| import javax.persistence.EntityManager; |
| import javax.persistence.RollbackException; |
| |
| import org.junit.Ignore; |
| |
| /** |
| * Tests that if any of the slices fail then none of the slices are committed. |
| * |
| * The test setup assumes that configuration is created for each slice to store |
| * cars from a particular Manufacturer. |
| * |
| * @author Pinaki Poddar |
| * |
| */ |
| public class TestTransaction extends SliceTestCase { |
| private static final Random rng = new Random(System.currentTimeMillis()); |
| Manufacturer[] manufacturers; |
| |
| protected String getPersistenceUnitName() { |
| return System.getProperty("unit","car"); |
| } |
| |
| |
| public void setUp() throws Exception { |
| super.setUp(CLEAR_TABLES, |
| Car.class, Manufacturer.class, |
| "openjpa.slice.DistributionPolicy", CarDistributorPolicy.class.getName()); |
| DistributedConfiguration conf = (DistributedConfiguration)emf.getConfiguration(); |
| List<Slice> slices = conf.getSlices((Slice.Status[])null); |
| assertFalse(slices.isEmpty()); |
| manufacturers = persistManufacturers(slices); |
| } |
| |
| public void testCommitsAreAtomic() { |
| int nCarStart = count(Car.class); |
| persistCars(false); |
| int nCarStage1 = count(Car.class); |
| assertEquals(nCarStart+manufacturers.length, nCarStage1); |
| |
| for (int i = 0; i < 10; i++) { |
| persistCars(true); |
| int nCarStage2 = count(Car.class); |
| assertEquals(nCarStage1, nCarStage2); |
| } |
| } |
| |
| Manufacturer getManufacturer(EntityManager em, Slice slice) { |
| Manufacturer m = em.find(Manufacturer.class, slice.getName()); |
| if (m == null) { |
| m = new Manufacturer(); |
| m.setName(slice.getName()); |
| em.persist(m); |
| } |
| return m; |
| } |
| |
| /** |
| * Creates the manufacturers each per given slice. |
| */ |
| Manufacturer[] persistManufacturers(List<Slice> slices) { |
| Manufacturer[] manufacturers = new Manufacturer[slices.size()]; |
| int i = 0; |
| EntityManager em = emf.createEntityManager(); |
| em.getTransaction().begin(); |
| for (Slice slice : slices) { |
| manufacturers[i++] = getManufacturer(em, slice); |
| } |
| em.getTransaction().commit(); |
| return manufacturers; |
| } |
| |
| /** |
| * Create new car for each manufacture. |
| * @param introduceError if true then one of the car will carry null VIN. |
| */ |
| void persistCars(boolean introduceError) { |
| EntityManager em = emf.createEntityManager(); |
| em.getTransaction().begin(); |
| int i = introduceError ? rng.nextInt(manufacturers.length) : -1; |
| for (int j = 0; j < manufacturers.length; j++) { |
| Manufacturer maker = em.find(Manufacturer.class, manufacturers[j].getName()); |
| Car car = newCar(maker); |
| em.persist(car); |
| if (i == j) |
| car.setVin(null); // this will make the commit fail |
| } |
| try { |
| em.getTransaction().commit(); |
| if (introduceError) { |
| fail("Expected " + RollbackException.class.getName()); |
| } |
| } catch (RollbackException e) { |
| if (!introduceError) { |
| fail("Expected " + RollbackException.class.getName()); |
| } else { |
| // this is expected |
| } |
| } |
| } |
| |
| Car newCar(Manufacturer maker) { |
| Car car = new Car(); |
| car.setVin(maker.getName().charAt(0) + randomString(6)); |
| car.setMaker(maker); |
| return car; |
| } |
| |
| String randomString(int n) { |
| StringBuilder s = new StringBuilder(); |
| for (int i = 0; i < n; i++) { |
| s.append(rng.nextInt(10)); |
| } |
| return s.toString(); |
| } |
| |
| /** |
| * A distribution policy that selects the slice based on Manufacturer. |
| * @author Pinaki Poddar |
| * |
| */ |
| @Ignore |
| public static class CarDistributorPolicy implements DistributionPolicy { |
| public String distribute(Object pc, List<String> slices, Object context) { |
| if (pc instanceof Manufacturer) { |
| return ((Manufacturer)pc).getName(); |
| } else if (pc instanceof Car) { |
| if (((Car) pc).getMaker() == null) { |
| throw new RuntimeException("New " + pc + " must have a non-null Manufacturer"); |
| } |
| return distribute(((Car)pc).getMaker(), slices, context); |
| } |
| throw new RuntimeException("No policy for " + pc.getClass().getName()); |
| } |
| } |
| } |