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.callback.impl;
  
  import com.alibaba.jstorm.blobstore.BlobStoreUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.alibaba.jstorm.callback.BaseCallback;
  import com.alibaba.jstorm.cluster.StormBase;
  import com.alibaba.jstorm.daemon.nimbus.NimbusData;
  import com.alibaba.jstorm.daemon.nimbus.NimbusUtils;
  
  import java.util.List;
  
  /**
   * Remove topology /ZK-DIR/topology data
   *
   * remove this ZK node will trigger watch on this topology
   *
   * And Monitor thread every 10 seconds will clean these disappear topology
   */
  public class RemoveTransitionCallback extends BaseCallback {
  
      private static Logger LOG = LoggerFactory.getLogger(RemoveTransitionCallback.class);
  
      protected NimbusData data;
      protected String topologyId;
  
      public RemoveTransitionCallback(NimbusData data, String topologyId) {
          this.data = data;
          this.topologyId = topologyId;
      }
  
      @Override
      public <T> Object execute(T... args) {
          LOG.info("Begin to remove topology: " + topologyId);
          try {
  
              StormBase stormBase = data.getStormClusterState().storm_base(topologyId, null);
              if (stormBase == null) {
                  LOG.info("Topology " + topologyId + " has been removed.");
                  return null;
              }
              data.getStormClusterState().remove_storm(topologyId);
              data.getTasksHeartbeat().remove(topologyId);
              data.getTaskHeartbeatsCache().remove(topologyId);
              NimbusUtils.removeTopologyTaskTimeout(data, topologyId);
  
              // delete topology files in blobstore
              List<String> deleteKeys = BlobStoreUtils.getKeyListFromId(data, topologyId);
              BlobStoreUtils.cleanup_keys(deleteKeys, data.getBlobStore(), data.getStormClusterState());
  
              LOG.info("Successfully removed ZK items of topology: " + topologyId);
          } catch (Exception e) {
              LOG.warn("Failed to remove StormBase " + topologyId + " from ZK", e);
          }
          return null;
      }
  
  }
  