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ZookeeperLeaderElector.java
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ZookeeperLeaderElector.java
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/*******************************************************************************
* Copyright Kevin Lynx (kevinlynx@gmail.com) 2015
*
* 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.codemacro.jcm.util;
import java.util.List;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooKeeper;
public class ZookeeperLeaderElector {
public static byte[] elect(ZooKeeper zk, String path, final String prefix)
throws KeeperException, InterruptedException {
List<String> children = zk.getChildren(path, false);
if (children.size() == 0) {
return null;
}
int min = -1;
String minPath = null;
for (String child : children) {
String idStr = child.substring(prefix.length());
int id = Integer.parseInt(idStr);
if (min < 0 || id < min) {
min = id;
minPath = child;
}
}
String fullPath = path + "/" + minPath;
return zk.getData(fullPath, false, null);
}
}