package org.apache.blur.manager.indexserver;
/**
* 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.
*/
import org.apache.blur.log.Log;
import org.apache.blur.log.LogFactory;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.Watcher.Event.KeeperState;
public class BlurServerShutDown implements Watcher {
private static final Log LOG = LogFactory.getLog(BlurServerShutDown.class);
public interface BlurShutdown {
void shutdown();
}
private BlurShutdown shutdown;
private ZooKeeper zooKeeper;
public BlurServerShutDown() {
Runtime runtime = Runtime.getRuntime();
runtime.addShutdownHook(new Thread(new Runnable() {
@Override
public void run() {
try {
LOG.info("Closing zookeeper.");
zooKeeper.close();
} catch (InterruptedException e) {
LOG.error("Unknown error while closing zookeeper.", e);
}
}
}));
}
public void register(final BlurShutdown shutdown, ZooKeeper zooKeeper) {
this.shutdown = shutdown;
this.zooKeeper = zooKeeper;
zooKeeper.register(new Watcher() {
@Override
public void process(WatchedEvent event) {
KeeperState state = event.getState();
if (state == KeeperState.Expired) {
LOG.fatal("Zookeeper session has [" + state + "] server process shutting down.");
shutdown.shutdown();
}
}
});
}
@Override
public void process(WatchedEvent event) {
register(shutdown, zooKeeper);
}
}