com.xiaomi.linden.common.EmbeddedZooKeeper.java Source code

Introduction

Here is the source code for com.xiaomi.linden.common.EmbeddedZooKeeper.java

Source

// Copyright 2016 Xiaomi, Inc.
//
// 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.xiaomi.linden.common;

import com.google.common.base.Throwables;
import org.apache.commons.io.FileUtils;
import org.apache.zookeeper.server.ServerConfig;
import org.apache.zookeeper.server.ZooKeeperServerMain;
import org.apache.zookeeper.server.quorum.QuorumPeerConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.Properties;

public class EmbeddedZooKeeper extends ZooKeeperServerMain {
    private static final Logger LOGGER = LoggerFactory.getLogger(EmbeddedZooKeeper.class);
    private Thread thread;
    private Properties zkConfig = null;
    private File zkDir;
    private int port = 2181;

    public EmbeddedZooKeeper(File dir) {
        this.zkDir = dir;
    }

    public EmbeddedZooKeeper(File dir, int clientPort) {
        this.port = clientPort;
        this.zkDir = dir;
    }

    public void start() throws Exception {
        try {
            // zkDir = genZookeeperDataDir();
            zkConfig = genZookeeperConfig(zkDir);
            port = Integer.valueOf(zkConfig.getProperty("clientPort"));
            QuorumPeerConfig qpConfig = new QuorumPeerConfig();
            qpConfig.parseProperties(zkConfig);
            final ServerConfig sConfig = new ServerConfig();
            sConfig.readFrom(qpConfig);

            thread = new Thread() {

                @Override
                public void run() {
                    try {
                        LOGGER.info("Starting ZK server");
                        runFromConfig(sConfig);
                    } catch (Throwable t) {
                        LOGGER.error("Failure in embedded ZooKeeper", t);
                    }
                }
            };

            thread.start();
            Thread.sleep(500);
        } catch (Throwable t) {
            throw new Exception("Cannot start embedded zookeeper", t);
        }
    }

    private File genZookeeperDataDir() {
        File zkDir = null;
        try {
            zkDir = File.createTempFile("zoo", "data");
            if (!zkDir.delete())
                throw new IOException("Can't rm zkDir " + zkDir.getCanonicalPath());
            if (!zkDir.mkdir())
                throw new IOException("Can't mkdir zkDir " + zkDir.getCanonicalPath());
        } catch (IOException e) {
            LOGGER.error("Can't make zookeeper data dir");
        }
        return zkDir;
    }

    private Properties genZookeeperConfig(File zkDir) throws IOException {
        Properties props = new Properties();
        props.setProperty("timeTick", "2000");
        props.setProperty("initLimit", "10");
        props.setProperty("syncLimit", "5");
        try {
            props.setProperty("dataDir", zkDir.getCanonicalPath());
        } catch (IOException e) {
            LOGGER.error("Can't create zkConfig, zkDir has no path");
        }

        props.setProperty("clientPort", String.valueOf(port));
        return props;
    }

    public void shutdown() {
        try {
            LOGGER.info("Stopping ZK server");
            thread.interrupt();
        } catch (Exception e) {
            LOGGER.error("Shutdonw failed : {}", Throwables.getStackTraceAsString(e));
        } finally {
            try {
                FileUtils.deleteDirectory(zkDir);
            } catch (Throwable t) {
                LOGGER.error("Cannot cleanup tmp dirs {}", zkDir.getAbsolutePath());
            }
        }
    }
}