/*
 * 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.lenya.cms.observation;

import org.apache.avalon.framework.activity.Startable;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.thread.ThreadSafe;

/**
 * Abstract repository listener implementation which registeres with the observation
 * registry at startup.
 */
public abstract class AbstractRepositoryListener extends AbstractLogEnabled implements Serviceable,
        Startable, ThreadSafe, RepositoryListener {
    
    public void start() throws Exception {
        ObservationRegistry registry = null;
        try {
            registry = (ObservationRegistry) this.manager.lookup(ObservationRegistry.ROLE);
            registry.registerListener(this);
        } finally {
            if (registry != null) {
                this.manager.release(registry);
            }
        }
    }

    public void stop() throws Exception {
    }

    protected ServiceManager manager;

    public void service(ServiceManager manager) throws ServiceException {
        this.manager = manager;
    }

}