content: /*
   * Copyright (c) OSGi Alliance (2008, 2009). 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.osgi.service.blueprint.reflect;
  
  /**
   * Metadata for a reference listener interested in the reference bind and unbind
   * events for a service reference.
   * 
   * @ThreadSafe
   * @version $Revision$
   */
  public interface ReferenceListener {
  
  	/**
  	 * Return the Metadata for the component that will receive bind and unbind
  	 * events.
  	 * 
  	 * This is specified by the <code>ref</code> attribute or via an inlined
  	 * component.
  	 * 
  	 * @return The Metadata for the component that will receive bind and unbind
  	 *         events.
  	 */
  	Target getListenerComponent();
  
  	/**
  	 * Return the name of the bind method. The bind method will be invoked when
  	 * a matching service is bound to the reference.
  	 * 
  	 * This is specified by the <code>bind-method</code> attribute of the
  	 * reference listener.
  	 * 
  	 * @return The name of the bind method.
  	 */
  	String getBindMethod();
  
  	/**
  	 * Return the name of the unbind method. The unbind method will be invoked
  	 * when a matching service is unbound from the reference.
  	 * 
  	 * This is specified by the <code>unbind-method</code> attribute of the
  	 * reference listener.
  	 * 
  	 * @return The name of the unbind method.
  	 */
  	String getUnbindMethod();
  }
  