/*
* 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.exoplatform.services.jcr.impl.core.query;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* This class is used to manage the livecycle of the corresponding {@link IndexerIoMode}
* @author <a href="mailto:nicolas.filotto@exoplatform.com">Nicolas Filotto</a>
* @version $Id$
*
*/
public class IndexerIoModeHandler
{
/**
* The logger instance for this class
*/
private static final Logger log = LoggerFactory.getLogger("exo.jcr.component.core.IndexerIoModeHandler");
/**
* The current mode
*/
private volatile IndexerIoMode mode;
/**
* The list of all the listeners
*/
private final List<IndexerIoModeListener> listeners;
/**
* Initialize the mode
* @param mode the initial value of the mode
*/
public IndexerIoModeHandler(IndexerIoMode mode)
{
log.info("Indexer io mode=" + mode);
this.mode = mode;
this.listeners = new CopyOnWriteArrayList<IndexerIoModeListener>();
}
/**
* @return the current mode of the indexer
*/
public IndexerIoMode getMode()
{
return mode;
}
/**
* Changes the current mode of the indexer. If the value has changes all the listeners
* will be notified
*/
public synchronized void setMode(IndexerIoMode mode)
{
if (this.mode != mode)
{
log.info("Indexer io mode=" + mode);
this.mode = mode;
for (IndexerIoModeListener listener : listeners)
{
listener.onChangeMode(mode);
}
}
}
/**
* Add a new IndexerIoModeListener to the list of listeners
* @param listener the listener to add
*/
public void addIndexerIoModeListener(IndexerIoModeListener listener)
{
listeners.add(listener);
}
/**
* Removes IndexerIoModeListener from the list of listeners
* @param listener
*/
public void removeIndexerIoModeListener(IndexerIoModeListener listener)
{
listeners.remove(listener);
}
}