SCM-Manager/scm-webapp/src/main/java/sonia/scm/ScmEventBusModule.java

/**
 * Copyright (c) 2010, Sebastian Sdorra
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of SCM-Manager; nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * http://bitbucket.org/sdorra/scm-manager
 *
 */



package sonia.scm;

//~--- non-JDK imports --------------------------------------------------------

import com.google.inject.AbstractModule;
import com.google.inject.TypeLiteral;
import com.google.inject.matcher.Matchers;
import com.google.inject.spi.InjectionListener;
import com.google.inject.spi.TypeEncounter;
import com.google.inject.spi.TypeListener;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import sonia.scm.event.ScmEventBus;
import sonia.scm.event.Subscriber;

/**
 *
 * @author Sebastian Sdorra
 */
public class ScmEventBusModule extends AbstractModule
{

  /**
   * the logger for ScmSubscriberModule
   */
  private static final Logger logger =
    LoggerFactory.getLogger(ScmEventBusModule.class);

  //~--- methods --------------------------------------------------------------

  /**
   * Method description
   *
   */
  @Override
  protected void configure()
  {
    bindListener(Matchers.any(), new TypeListener()
    {

      @Override
      public <I> void hear(TypeLiteral<I> type, TypeEncounter<I> encounter)
      {
        encounter.register(new InjectionListener<I>()
        {
          @Override
          public void afterInjection(Object object)
          {
            Class<?> clazz = object.getClass();

            logger.trace("register subscriber {}", clazz);

            ScmEventBus.getInstance().register(object, isAsync(clazz));
          }
        });
      }

    });
  }

  //~--- get methods ----------------------------------------------------------

  /**
   * Method description
   *
   *
   * @param clazz
   *
   * @return
   */
  private boolean isAsync(Class<?> clazz)
  {
    boolean async = true;
    Subscriber subscriber = clazz.getAnnotation(Subscriber.class);

    if (subscriber != null)
    {
      async = subscriber.async();
    }

    return async;
  }
}