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ZkState.java
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ZkState.java
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/**
* 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.
*/
/*
* This file is based on the source code of the Kafka spout of the Apache Storm project.
* (https://github.com/apache/storm/tree/master/external/storm-kafka)
* This file has been modified to work with Spark Streaming.
*/
package consumer.kafka;
import java.io.Serializable;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Arrays;
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;
@SuppressWarnings("serial")
public class ZkState implements Serializable {
public static final Logger LOG = LoggerFactory.getLogger(ZkState.class);
private transient CuratorFramework _curator;
private CuratorFramework newCurator(Map<String, String> stateConf) throws Exception {
Integer port = Integer.parseInt((String) stateConf.get(Config.ZOOKEEPER_PORT));
String serverPorts = "";
List<String> zkServers = new ArrayList<String>(
Arrays.asList(((String) stateConf.get(Config.ZOOKEEPER_HOSTS)).split(",")));
for (String server : zkServers) {
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 curator service");
_curator.start();
} catch (Exception e) {
LOG.error("Curator service not started");
throw new RuntimeException(e);
}
}
public synchronized void writeJSON(String path, Map<Object, Object> data) {
LOG.debug("Writing to path : {} json: {}", path, 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);
}
}
@SuppressWarnings("unchecked")
public Map<Object, Object> readJSON(String path) {
try {
byte[] b = readBytes(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[] readBytes(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;
}
}