com.anhth12.spark.kafka.consumer.ZkState.java Source code

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Here is the source code for com.anhth12.spark.kafka.consumer.ZkState.java

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package com.anhth12.spark.kafka.consumer;

import java.io.Serializable;
import java.nio.charset.Charset;
import java.util.List;
import java.util.Map;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.retry.RetryNTimes;
import org.apache.zookeeper.CreateMode;
import org.json.simple.JSONValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 * @author Tong Hoang Anh
 */
public class ZkState implements Serializable {

    public static final Logger log = LoggerFactory.getLogger(ZkState.class);

    transient CuratorFramework _curator;

    private CuratorFramework newCurator(Map stateConf) {
        Integer port = Integer.parseInt((String) stateConf.get(Config.ZOOKEEPER_PORT));

        String serverPorts = "";
        for (String server : (List<String>) stateConf.get(Config.ZOOKEEPER_HOSTS)) {
            serverPorts = serverPorts + server + ":" + port + ",";
        }

        return CuratorFrameworkFactory.newClient(serverPorts, 120000, 120000, new RetryNTimes(5, 1000));
    }

    public CuratorFramework getCurator() {
        assert _curator != null;
        return _curator;
    }

    public ZkState(KafkaConfig config) {
        try {
            _curator = newCurator(config._stateConf);
            log.info("Starting curator service");
            _curator.start();
        } catch (Exception e) {
            log.error("Curator service not started");
            throw new RuntimeException(e);
        }
    }

    public ZkState(String connectionStr) {
        try {
            _curator = CuratorFrameworkFactory.newClient(connectionStr, 120000, 120000, new RetryNTimes(5, 1000));
            log.info("Starting currator service");
            _curator.start();
        } catch (Exception e) {
            log.error("Curator service not started");
            throw new RuntimeException(e);
        }
    }

    public void writeJSON(String path, Map<Object, Object> data) {
        log.info("Writing " + path + " the data " + data.toString());
        writeBytes(path, JSONValue.toJSONString(data).getBytes(Charset.forName("UTF-8")));

    }

    public void writeBytes(String path, byte[] bytes) {
        try {
            if (_curator.checkExists().forPath(path) == null) {
                _curator.create().creatingParentsIfNeeded().withMode(CreateMode.PERSISTENT).forPath(path, bytes);
            } else {
                _curator.setData().forPath(path, bytes);
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public Map<Object, Object> readJSON(String path) {
        try {
            byte[] b = readByte(path);
            if (b == null) {
                return null;
            }
            return (Map<Object, Object>) JSONValue.parse(new String(b, "UTF-8"));
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public byte[] readByte(String path) {
        try {
            if (_curator.checkExists().forPath(path) != null) {
                return _curator.getData().forPath(path);
            } else {
                return null;
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public void close() {
        _curator.close();
        _curator = null;
    }

}