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Java example source code file (

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The 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

 * Persistence provider service. Use this to manage the overall
 * startup and stop of the persistence module(s).
 * TODO(dhanji): Integrate with Service API when appropriate.
 * @author (Dhanji R. Prasanna)
public interface PersistService {

   * Starts the underlying persistence engine and makes guice-persist ready for
   * use. For instance, with JPA, it creates an EntityManagerFactory and may
   * open connection pools. This method must be called by your code prior to
   * using any guice-persist or JPA artifacts. If already started,
   * calling this method does nothing, if already stopped, it also does
   * nothing.
  void start();

   * Stops the underlying persistence engine. For instance, with JPA, it
   * closes the {@code EntityManagerFactory}. If already stopped, calling this
   * method does nothing. If not yet started, it also does nothing.
  void stop();

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