AcidHouseAppEngineStrongDatastoreSession.java :  » Google-tech » gig » org » eiichiro » gig » acidhouse » Java Open Source

/*
 * Copyright (C) 2011 Eiichiro Uchiumi. All Rights Reserved.
 * 
 * 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 org.eiichiro.gig.acidhouse;

import java.lang.reflect.Method;
import java.util.HashSet;
import java.util.Set;

import org.eiichiro.acidhouse.DatastoreSession;
import org.eiichiro.acidhouse.appengine.AppEngineStrongDatastoreSession;
import org.eiichiro.jazzmaster.Application;
import org.eiichiro.jazzmaster.management.Lifecycle;
import org.eiichiro.jazzmaster.management.Scope;
import org.eiichiro.jazzmaster.service.Service;

/**
 * {@code AcidHouseAppEngineStrongDatastoreSession} is a Jazzmaster service 
 * to composite {@code AppEngineDatastoreSession} with your Jazzmaster component.
 * 
 * @author <a href="mailto:eiichiro@eiichiro.org">Eiichiro Uchiumi</a>
 */
@Strong
public class AcidHouseAppEngineStrongDatastoreSession extends Service {

  /**
   * Returns {@code AppEngineStrongDatastoreSession} as Jazzmaster service 
   * implementation.
   */
  @Override
  public Class<?> getImplementation() {
    return AppEngineStrongDatastoreSession.class;
  }
  
  /**
   * Returns {@code Scope.REQUEST} if application is running on Web 
   * environment. Otherwise, returns {@code Scope.THREAD}. 
   */
  @Override
  public Scope getScope() {
    if (Application.isWeb()) {
      return Scope.REQUEST;
    } else {
      return Scope.THREAD;
    }
  }
  
  /**
   * Returns {@code DatastoreSession#close()} method when this component is 
   * stopped.
   */
  @Override 
  public Set<Method> getCallbacks(Lifecycle lifecycle) {
    if (lifecycle == Lifecycle.STOPPED) {
      Set<Method> set = new HashSet<Method>(1);
      
      try {
        Method method = DatastoreSession.class.getDeclaredMethod("close");
        set.add(method);
      } catch (Exception e) {}
      
      return set;
    } else {
      return new HashSet<Method>(0);
    }
  }

}