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Java example source code file (ManualLocalTransactionsTest.java)

This example Java source code file (ManualLocalTransactionsTest.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, inject, injector, jpapersistmodule, jpatestentity, manuallocaltransactionstest, string, testcase, transactional, transactionalobject, unique_text, unique_text_2, util

The ManualLocalTransactionsTest.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.util.Date;

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

/**
 * For instance, a session-per-request strategy will control the opening and closing of the EM at
 * its own (manual) discretion. As opposed to a transactional unit of work.
 *
 * @author Dhanji R. Prasanna (dhanji@gmail.com)
 */

public class ManualLocalTransactionsTest extends TestCase {
  private Injector injector;
  private static final String UNIQUE_TEXT = "some unique text" + new Date();
  private static final String UNIQUE_TEXT_2 = "some other unique text" + new Date();

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

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

  public void tearDown() {
    injector.getInstance(EntityManagerFactory.class).close();
  }

  public void testSimpleCrossTxnWork() {
    injector.getInstance(UnitOfWork.class).begin();

    //pretend that the request was started here
    EntityManager em = injector.getInstance(EntityManager.class);

    JpaTestEntity entity = injector.getInstance(TransactionalObject.class).runOperationInTxn();
    injector.getInstance(TransactionalObject.class).runOperationInTxn2();

    //persisted entity should remain in the same em (which should still be open)
    assertTrue("EntityManager  appears to have been closed across txns!",
        injector.getInstance(EntityManager.class).contains(entity));
    assertTrue("EntityManager  appears to have been closed across txns!", em.contains(entity));
    assertTrue("EntityManager appears to have been closed across txns!", em.isOpen());

    injector.getInstance(UnitOfWork.class).end();
    injector.getInstance(UnitOfWork.class).begin();

    //try to query them back out
    em = injector.getInstance(EntityManager.class);
    assertNotNull(em.createQuery("from JpaTestEntity where text = :text")
        .setParameter("text", UNIQUE_TEXT).getSingleResult());
    assertNotNull(em.createQuery("from JpaTestEntity where text = :text")
        .setParameter("text", UNIQUE_TEXT_2).getSingleResult());
    em.close();

    assertFalse(em.isOpen());
  }

  public static class TransactionalObject {
    @Inject EntityManager em;

    @Transactional
    public JpaTestEntity runOperationInTxn() {
      JpaTestEntity entity = new JpaTestEntity();
      entity.setText(UNIQUE_TEXT);
      em.persist(entity);

      return entity;
    }

    @Transactional
    public void runOperationInTxn2() {
      JpaTestEntity entity = new JpaTestEntity();
      entity.setText(UNIQUE_TEXT_2);
      em.persist(entity);
    }

  }
}

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