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Java example source code file (JoiningLocalTransactionsTest.java)

This example Java source code file (JoiningLocalTransactionsTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

date, entitymanager, illegalstateexception, ioexception, joininglocaltransactionstest, jpapersistmodule, jpatestentity, noresultexception, object, override, string, transactional, transactionalobject, unique_text, util

The JoiningLocalTransactionsTest.java Java example source code

/**
 * Copyright (C) 2010 Google, Inc.
 *
 * Licensed 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 com.google.inject.persist.jpa;

import com.google.inject.Guice;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.persist.PersistService;
import com.google.inject.persist.Transactional;
import com.google.inject.persist.UnitOfWork;

import junit.framework.TestCase;

import java.io.IOException;
import java.util.Date;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.NoResultException;

/**
 * @author Dhanji R. Prasanna (dhanji@gmail.com)
 */

public class JoiningLocalTransactionsTest extends TestCase {
  private Injector injector;
  private static final String UNIQUE_TEXT = JoiningLocalTransactionsTest.class + "some unique text"
      + new Date();
  private static final String TRANSIENT_UNIQUE_TEXT = JoiningLocalTransactionsTest.class
      + "some other unique text" + new Date();

  @Override
  public void setUp() {
    injector = Guice.createInjector(new JpaPersistModule("testUnit"));

    //startup persistence
    injector.getInstance(PersistService.class).start();
  }

  //cleanup entitymanager in case some of the rollback tests left it in an open state
  @Override
  public final void tearDown() {
    injector.getInstance(UnitOfWork.class).end();
    injector.getInstance(EntityManagerFactory.class).close();
  }

  public void testSimpleTransaction() {
    injector.getInstance(JoiningLocalTransactionsTest.TransactionalObject.class)
        .runOperationInTxn();

    EntityManager em = injector.getInstance(EntityManager.class);
    assertFalse("txn was not closed by transactional service",
        em.getTransaction().isActive());

    //test that the data has been stored
    Object result = em.createQuery("from JpaTestEntity where text = :text")
        .setParameter("text", UNIQUE_TEXT).getSingleResult();
    injector.getInstance(UnitOfWork.class).end();

    assertTrue("odd result returned fatal", result instanceof JpaTestEntity);

    assertEquals("queried entity did not match--did automatic txn fail?", UNIQUE_TEXT,
        ((JpaTestEntity) result).getText());
  }

  public void testSimpleTransactionRollbackOnChecked() {
    try {
      injector.getInstance(JoiningLocalTransactionsTest.TransactionalObject.class)
          .runOperationInTxnThrowingChecked();
    } catch (IOException e) {
      //ignore
      injector.getInstance(UnitOfWork.class).end();
    }

    EntityManager em = injector.getInstance(EntityManager.class);

    assertFalse("EM was not closed by transactional service (rollback didnt happen?)",
        em.getTransaction().isActive());

    //test that the data has been stored
    try {
      Object result = em.createQuery("from JpaTestEntity where text = :text")
          .setParameter("text", TRANSIENT_UNIQUE_TEXT).getSingleResult();
      injector.getInstance(UnitOfWork.class).end();
      fail("a result was returned! rollback sure didnt happen!!!");
    } catch (NoResultException e) { }
  }

  public void testSimpleTransactionRollbackOnUnchecked() {
    try {
      injector.getInstance(JoiningLocalTransactionsTest.TransactionalObject.class)
          .runOperationInTxnThrowingUnchecked();
    } catch (RuntimeException re) {
      //ignore
      injector.getInstance(UnitOfWork.class).end();
    }

    EntityManager em = injector.getInstance(EntityManager.class);
    assertFalse("Session was not closed by transactional service (rollback didnt happen?)",
        em.getTransaction().isActive());

    try {
      Object result = em.createQuery("from JpaTestEntity where text = :text")
          .setParameter("text", TRANSIENT_UNIQUE_TEXT).getSingleResult();
      injector.getInstance(UnitOfWork.class).end();
      fail("a result was returned! rollback sure didnt happen!!!");
    } catch (NoResultException e) {}
  }

  public static class TransactionalObject {
    private final EntityManager em;

    @Inject
    public TransactionalObject(EntityManager em) {
      this.em = em;
    }

    @Transactional
    public void runOperationInTxn() {
      runOperationInTxnInternal();
    }

    @Transactional(rollbackOn = IOException.class)
    public void runOperationInTxnInternal() {
      JpaTestEntity entity = new JpaTestEntity();
      entity.setText(UNIQUE_TEXT);
      em.persist(entity);
    }

    @Transactional(rollbackOn = IOException.class)
    public void runOperationInTxnThrowingChecked() throws IOException {
      runOperationInTxnThrowingCheckedInternal();
    }

    @Transactional
    private void runOperationInTxnThrowingCheckedInternal() throws IOException {
      JpaTestEntity entity = new JpaTestEntity();
      entity.setText(TRANSIENT_UNIQUE_TEXT);
      em.persist(entity);

      throw new IOException();
    }

    @Transactional
    public void runOperationInTxnThrowingUnchecked() {
      runOperationInTxnThrowingUncheckedInternal();
    }

    @Transactional(rollbackOn = IOException.class)
    public void runOperationInTxnThrowingUncheckedInternal() {
      JpaTestEntity entity = new JpaTestEntity();
      entity.setText(TRANSIENT_UNIQUE_TEXT);
      em.persist(entity);

      throw new IllegalStateException();
    }
  }
}

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