| /** |
| * 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 storm.kafka; |
| |
| import backtype.storm.Config; |
| import backtype.storm.utils.Utils; |
| 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; |
| |
| import java.nio.charset.Charset; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| public class ZkState { |
| public static final Logger LOG = LoggerFactory.getLogger(ZkState.class); |
| CuratorFramework _curator; |
| |
| private CuratorFramework newCurator(Map stateConf) throws Exception { |
| Integer port = (Integer) stateConf.get(Config.TRANSACTIONAL_ZOOKEEPER_PORT); |
| String serverPorts = ""; |
| for (String server : (List<String>) stateConf.get(Config.TRANSACTIONAL_ZOOKEEPER_SERVERS)) { |
| serverPorts = serverPorts + server + ":" + port + ","; |
| } |
| return CuratorFrameworkFactory.newClient(serverPorts, |
| Utils.getInt(stateConf.get(Config.STORM_ZOOKEEPER_SESSION_TIMEOUT)), |
| 15000, |
| new RetryNTimes(Utils.getInt(stateConf.get(Config.STORM_ZOOKEEPER_RETRY_TIMES)), |
| Utils.getInt(stateConf.get(Config.STORM_ZOOKEEPER_RETRY_INTERVAL)))); |
| } |
| |
| public CuratorFramework getCurator() { |
| assert _curator != null; |
| return _curator; |
| } |
| |
| public ZkState(Map stateConf) { |
| stateConf = new HashMap(stateConf); |
| |
| try { |
| _curator = newCurator(stateConf); |
| _curator.start(); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public void writeJSON(String path, Map<Object, Object> data) { |
| LOG.debug("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 = 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; |
| } |
| } |