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/*
 * 
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 2007-2010 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */
package org.jvnet.hk2.component;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.jvnet.hk2.annotations.Inject;
import org.jvnet.hk2.component.concurrent.WorkManager;

/**
 * A simple multi-threaded based {@link InhabitantActivator}
 * 
 * @author Jeff Trent
 */
public class MultiThreadedInhabitantActivator implements InhabitantActivator {

  private WorkManager wm;
  private final AsyncWaiter waiter = new AsyncWaiter();
  
  @Inject(name=Constants.EXECUTOR_INHABITANT_ACTIVATOR, optional=true)
  public void setExecutorService(Executor es) {
    wm = new WorkManager(es);
  }


  @Override
  public void activate(final Inhabitant inhabitant) {
    if (!inhabitant.isActive()) {
      wm.execute(new Runnable() {
        @Override
        public void run() {
          inhabitant.get();
        }
      });

      waiter.watchIfNecessary(inhabitant);
    }
  }

  @Override
  public void deactivate(final Inhabitant inhabitant) {
//    if (inhabitant.isActive()) {
//      wm.execute(new Runnable() {
//        @Override
//        public void run() {
//          inhabitant.release();
//        }
//      });
//    }
    // deactivation should not happen in parallel!
    inhabitant.release();
  }

  @Override
  public void awaitCompletion() throws InterruptedException, ExecutionException, TimeoutException {
    wm.awaitCompletion();
    waiter.waitForDone();
  }

  @Override
  public void awaitCompletion(long timeout, TimeUnit unit) throws ExecutionException, InterruptedException, TimeoutException {
      long millisTimeout = unit.toMillis(timeout);

      long start = System.currentTimeMillis();
      wm.awaitCompletion(timeout, unit);
      long end = System.currentTimeMillis();
      
      millisTimeout -= (end - start);
      if (millisTimeout > 0) {
        waiter.waitForDone(millisTimeout, TimeUnit.MILLISECONDS);
      }
  }

}