openjpa-kernel/src/main/java/org/apache/openjpa/event/LifecycleCallbacks.java

/*
 * 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.event;

import java.io.Serializable;

/**
 * A lifecycle listener that responds to callbacks rather than events.
 *
 * @author Steve Kim
 */
public interface LifecycleCallbacks
    extends Serializable {

    /**
     * Return whether the given instance has a callback for the given
     * event type.
     */
    public boolean hasCallback(Object obj, int eventType);

    /**
     * Invoke the callback for the given event type on the given instance.
     */
    public void makeCallback(Object obj, Object related, int eventType)
        throws Exception;
}