cn.lhfei.zookeeper.CreateGroup.java Source code

Introduction

Here is the source code for cn.lhfei.zookeeper.CreateGroup.java

Source

/*
 * Copyright 2010-2011 the original author or authors.
 *
 * 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 cn.lhfei.zookeeper;

import java.io.IOException;
import java.util.concurrent.CountDownLatch;

import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.Watcher.Event.KeeperState;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @version 0.1
 *
 * @author Hefei Li
 *
 * @since May 3, 2015
 */
public class CreateGroup implements Watcher {

    private static final Logger log = LoggerFactory.getLogger(CreateGroup.class);
    private static final int SESSION_TIMEOUT = 5000;
    private ZooKeeper zk;
    private CountDownLatch connectedSignal = new CountDownLatch(1);

    @Override
    public void process(WatchedEvent event) {
        if (event.getState() == KeeperState.SyncConnected) {
            connectedSignal.countDown();
        }
    }

    public void connect(String hosts) throws IOException, InterruptedException {
        zk = new ZooKeeper(hosts, SESSION_TIMEOUT, this);
        connectedSignal.await();
    }

    public void create(String groupName) throws KeeperException, InterruptedException {
        String path = "/" + groupName;
        String createdPath = zk.create(path, "mydata".getBytes()/* data */, Ids.OPEN_ACL_UNSAFE,
                CreateMode.PERSISTENT);
        log.info("Created {}", createdPath);
    }

    public void close() throws InterruptedException {
        zk.close();
    }

    public static void main(String[] args) throws Exception {
        if (args == null || args.length != 2) {
            args = new String[2];
            args[0] = MyZkConfig.ZK_SERVER_MASTER; // master server
            args[1] = MyZkConfig.ZK_NODE_GROUP_NAME; // group name
        }

        CreateGroup createGroup = new CreateGroup();
        createGroup.connect(args[0]);
        createGroup.create(args[1]);
        createGroup.close();
    }
}