/*
 * Copyright 2005-2011 the original author or authors.
 * 
 * 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.wamblee.xmlrouter.listener;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.wamblee.concurrency.ReadLock;
import org.wamblee.concurrency.WriteLock;
import org.wamblee.xmlrouter.config.Transformation;

public class CompositeEventListener implements EventListener {

    private static final Logger LOGGER = Logger
        .getLogger(CompositeEventListener.class.getName());
    private List<EventListener> loggers;

    public CompositeEventListener() {
        loggers = new ArrayList<EventListener>();
    }

    /**
     * Adds a logger.
     * 
     * @param aLogger
     *            Logger
     */
    @WriteLock
    public void addListener(EventListener aLogger) {
        loggers.add(aLogger);
    }

    /**
     * Removes a logger.
     * 
     * @param aLogger
     *            Logger
     * @return True iff the logger was removed.
     */
    @WriteLock
    public boolean removeListener(EventListener aLogger) {
        Iterator<EventListener> logger = loggers.iterator();
        while (logger.hasNext()) {
            EventListener value = logger.next();
            if (value == aLogger) {
                logger.remove();
                return true;
            }
        }
        return false;
    }

    @Override
    @ReadLock
    public void delivered(EventInfo aInfo, List<Transformation> aSequence,
        long aDestinationId, String aDestinationName, boolean aSuccessFlag) {
        for (EventListener logger : loggers) {
            try {
                logger.delivered(aInfo, aSequence, aDestinationId,
                    aDestinationName, aSuccessFlag);
            } catch (Exception e) {
                LOGGER.log(Level.WARNING, "Logger threw exception", e);
            }
        }
    }

    @Override
    @ReadLock
    public void notDelivered(EventInfo aInfo) {
        for (EventListener logger : loggers) {
            try {
                logger.notDelivered(aInfo);
            } catch (Exception e) {
                LOGGER.log(Level.WARNING, "Logger threw exception", e);
            }
        }
    }

}