EventSubscriber.java

/*
 * Copyright (C) 2012 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
 *
 * 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 interactivespaces.event;

/**
 * A subscriber for {@link Event}.
 *
 * @author Keith M. Hughes
 */
public interface EventSubscriber {

  /**
   * Add an event listener for events of a given type.
   *
   * @param type
   *          the type of event
   * @param listener
   *          the listener for the event
   */
  void addEventListener(String type, EventListener listener);

  /**
   * Remove an event listener for events of a given type.
   *
   * <p>
   * Does nothing if the lister was never added for the given type
   *
   * @param type
   *          the type of event
   * @param listener
   *          the listener for the event
   */
  void removeEventListener(String type, EventListener listener);
}