content: /**
   * 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;
      }
  }