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Common utility code (Apache License v2) 2008-2024 Matt Gumbley, DevZendo.org

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/*
 * Copyright (C) 2008-2017 Matt Gumbley, DevZendo.org http://devzendo.org
 *
 * 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.devzendo.commoncode.patterns.observer;

/**
 * Implemented by objects that want to be attached to an ObserverList and
 * notified of the occurrence of a specific observable event.
 * 
 * @author matt
 *
 * @param  the subtype of ObservableEvent that this observer is interested
 * in.
 */
public interface Observer {
    /**
     * An event has occurred and this is the notification.
     * @param observableEvent the event information.
     */
    void eventOccurred(O observableEvent);
}