/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.openjpa.lib.util;
import java.util.Collection;
/**
* Basic event manager interface.
*
* @author Abe White
*/
public interface EventManager {
/**
* Add an event listener.
*/
public void addListener(Object listener);
/**
* Remove an event listener.
*/
public boolean removeListener(Object listener);
/**
* Return whether the given instance is in the list of listeners.
*/
public boolean hasListener(Object listener);
/**
* Return true if there are any registered listeners.
*/
public boolean hasListeners();
/**
* Return a read-only list of listeners.
*/
public Collection getListeners();
/**
* Fire the given event to all listeners, returning any exceptions.
*/
public Exception[] fireEvent(Object event);
}