/**
* 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.
*/
package com.alibaba.jstorm.kafka;
import backtype.storm.Config;
import backtype.storm.utils.Utils;
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.framework.api.CreateBuilder;
import org.apache.curator.framework.api.ProtectACLCreateModePathAndBytesable;
import org.apache.curator.retry.RetryNTimes;
import org.apache.zookeeper.CreateMode;
import org.json.simple.JSONValue;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ZkState {
public static final Logger LOG = LoggerFactory.getLogger(ZkState.class);
CuratorFramework _curator;
private CuratorFramework newCurator(Map conf, KafkaSpoutConfig config) throws Exception {
String serverPorts = "";
List<Host> zkServers = config.zkServers;
for (Host server : zkServers) {
serverPorts = serverPorts + server.getHost() + ":" + server.getPort() + ",";
}
return CuratorFrameworkFactory.newClient(serverPorts, Utils.getInt(conf.get(Config.STORM_ZOOKEEPER_SESSION_TIMEOUT)), 15000, new RetryNTimes(
Utils.getInt(conf.get(Config.STORM_ZOOKEEPER_RETRY_TIMES)), Utils.getInt(conf.get(Config.STORM_ZOOKEEPER_RETRY_INTERVAL))));
}
public CuratorFramework getCurator() {
assert _curator != null;
return _curator;
}
public ZkState(Map stateConf, KafkaSpoutConfig config) {
try {
_curator = newCurator(stateConf, config);
_curator.start();
} catch (Exception e) {
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) {
CreateBuilder builder = _curator.create();
ProtectACLCreateModePathAndBytesable<String> createAble = (ProtectACLCreateModePathAndBytesable<String>) builder
.creatingParentsIfNeeded();
createAble.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 = 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;
}
}