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 backtype.storm.transactional.state;
  
  import backtype.storm.Config;
  import backtype.storm.serialization.KryoValuesDeserializer;
  import backtype.storm.serialization.KryoValuesSerializer;
  import backtype.storm.utils.Utils;
  import backtype.storm.utils.ZookeeperAuthInfo;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import org.apache.curator.framework.CuratorFramework;
  import org.apache.curator.framework.api.PathAndBytesable;
  import org.apache.curator.framework.api.ProtectACLCreateModePathAndBytesable;
  import org.apache.zookeeper.CreateMode;
  import org.apache.zookeeper.KeeperException;
  import org.apache.zookeeper.data.ACL;
  
  public class TransactionalState {
      CuratorFramework _curator;
      KryoValuesSerializer _ser;
      KryoValuesDeserializer _des;
      List<ACL> _zkAcls = null;
  
      public static TransactionalState newUserState(Map conf, String id, Map componentConf) {
          return new TransactionalState(conf, id, componentConf, "user");
      }
  
      public static TransactionalState newCoordinatorState(Map conf, String id, Map componentConf) {
          return new TransactionalState(conf, id, componentConf, "coordinator");
      }
  
      @SuppressWarnings("unchecked")
      protected TransactionalState(Map conf, String id, Map componentConf, String subroot) {
          try {
              conf = new HashMap(conf);
              // ensure that the serialization registrations are consistent with the declarations in this spout
              if (componentConf != null) {
                  conf.put(Config.TOPOLOGY_KRYO_REGISTER, componentConf.get(Config.TOPOLOGY_KRYO_REGISTER));
              }
              String transactionalRoot = (String) conf.get(Config.TRANSACTIONAL_ZOOKEEPER_ROOT);
              String rootDir = transactionalRoot + "/" + id + "/" + subroot;
              List<String> servers = (List<String>) getWithBackup(
                      conf, Config.TRANSACTIONAL_ZOOKEEPER_SERVERS, Config.STORM_ZOOKEEPER_SERVERS);
              Object port = getWithBackup(conf, Config.TRANSACTIONAL_ZOOKEEPER_PORT, Config.STORM_ZOOKEEPER_PORT);
              ZookeeperAuthInfo auth = new ZookeeperAuthInfo(conf);
              CuratorFramework initter = Utils.newCuratorStarted(conf, servers, port, auth);
              _zkAcls = Utils.getWorkerACL(conf);
              try {
                  TransactionalState.createNode(initter, transactionalRoot, null, null, null);
              } catch (KeeperException.NodeExistsException ignored) {
              }
              try {
                  TransactionalState.createNode(initter, rootDir, null, _zkAcls, null);
              } catch (KeeperException.NodeExistsException ignored) {
              }
              initter.close();
  
              _curator = Utils.newCuratorStarted(conf, servers, port, rootDir, auth);
              _ser = new KryoValuesSerializer(conf);
              _des = new KryoValuesDeserializer(conf);
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      protected static String forPath(PathAndBytesable<String> builder, String path, byte[] data) throws Exception {
          return (data == null) ? builder.forPath(path) : builder.forPath(path, data);
      }
  
      protected static void createNode(CuratorFramework curator, String path,
                                       byte[] data, List<ACL> acls, CreateMode mode) throws Exception {
          ProtectACLCreateModePathAndBytesable<String> builder = curator.create().creatingParentsIfNeeded();
          if (acls == null) {
              if (mode == null) {
                  TransactionalState.forPath(builder, path, data);
              } else {
                  TransactionalState.forPath(builder.withMode(mode), path, data);
              }
              return;
          }
          TransactionalState.forPath(builder.withACL(acls), path, data);
      }
  
      public void setData(String path, Object obj) {
          path = "/" + path;
          byte[] ser = _ser.serializeObject(obj);
          try {
              if (_curator.checkExists().forPath(path) != null) {
                  _curator.setData().forPath(path, ser);
              } else {
                  TransactionalState.createNode(_curator, path, ser, _zkAcls, CreateMode.PERSISTENT);
              }
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      public void delete(String path) {
          path = "/" + path;
          try {
              _curator.delete().forPath(path);
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      public List<String> list(String path) {
          path = "/" + path;
          try {
              if (_curator.checkExists().forPath(path) == null) {
                  return new ArrayList<>();
              } else {
                  return _curator.getChildren().forPath(path);
              }
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      public void mkdir(String path) {
          setData(path, 7);
      }
  
      public Object getData(String path) {
          path = "/" + path;
          try {
              if (_curator.checkExists().forPath(path) != null) {
                  return _des.deserializeObject(_curator.getData().forPath(path));
              } else {
                  return null;
              }
          } catch (Exception e) {
              throw new RuntimeException(e);
          }
      }
  
      public void close() {
          _curator.close();
      }
  
      private Object getWithBackup(Map amap, Object primary, Object backup) {
          Object ret = amap.get(primary);
          if (ret == null)
              return amap.get(backup);
          return ret;
      }
  }
  