com.jiuxian.theone.zk.ConnectionListener.java Source code

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Here is the source code for com.jiuxian.theone.zk.ConnectionListener.java

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/**
 * Copyright 2015-2020 jiuxian.com.
 *  
 * 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 com.jiuxian.theone.zk;

import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.api.CuratorEvent;
import org.apache.curator.framework.api.CuratorListener;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Listener for zookeeper's disconnected event, and close the resource involved
 * and kill itself when the event happens.
 * 
 * @author <a href="mailto:wangyuxuan@jiuxian.com">Yuxuan Wang</a>
 *
 */
public class ConnectionListener implements CuratorListener {

    private AutoCloseable resource;

    private static final Logger LOGGER = LoggerFactory.getLogger(ConnectionListener.class);

    @Override
    public void eventReceived(CuratorFramework client, CuratorEvent event) throws Exception {
        LOGGER.info(event.toString());
        final WatchedEvent watchedEvent = event.getWatchedEvent();
        if (watchedEvent != null && watchedEvent.getState() == KeeperState.Disconnected) {
            try {
                resource.close();
            } finally {
                System.exit(0);
            }
        }
    }

    public void setResource(AutoCloseable resource) {
        this.resource = resource;
    }

}