/**
* 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 com.alibaba.wasp.client;
import com.alibaba.wasp.ServerName;
import com.alibaba.wasp.zookeeper.FServerTracker;
import com.alibaba.wasp.zookeeper.ZKUtil;
import com.alibaba.wasp.zookeeper.ZooKeeperWatcher;
import org.apache.zookeeper.KeeperException;
import java.io.IOException;
import java.util.List;
public class FClientFServerTracker extends FServerTracker {
/**
* Hacked from FServerTracker.
*
* @param watcher
*/
public FClientFServerTracker(ZooKeeperWatcher watcher) {
super(watcher, null, null);
}
@Override
public void nodeDeleted(String path) {
if (path.startsWith(watcher.fsZNode)) {
String serverName = ZKUtil.getNodeName(path);
LOG.info("FServer ephemeral node deleted, processing expiration ["
+ serverName + "]");
ServerName sn = ServerName.parseServerName(serverName);
remove(sn);
}
}
@Override
public void nodeChildrenChanged(String path) {
if (path.equals(watcher.fsZNode)) {
try {
List<String> servers = ZKUtil.listChildrenAndWatchThem(watcher,
watcher.fsZNode);
add(servers);
} catch (IOException e) {
LOG.warn("Unexpected zk exception getting RS nodes", e);
} catch (KeeperException e) {
LOG.warn("Unexpected zk exception getting RS nodes", e);
}
}
}
}