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 backtype.storm.Config;
  import com.alibaba.jstorm.callback.BaseCallback;
  import com.alibaba.jstorm.cluster.StormConfig;
  import com.alibaba.jstorm.cluster.StormStatus;
  import com.alibaba.jstorm.daemon.nimbus.NimbusData;
  import com.alibaba.jstorm.daemon.nimbus.StatusType;
  import com.alibaba.jstorm.schedule.DelayEventRunnable;
  import com.alibaba.jstorm.utils.JStormUtils;
  import java.util.Map;
  import java.util.concurrent.TimeUnit;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * The action when nimbus receive kill command
   * 1. set the topology status to target status
   * 2. wait 2 * timeout seconds and remove topology from ZK
   *
   * @author Longda
   */
  public class DelayStatusTransitionCallback extends BaseCallback {
      private static Logger LOG = LoggerFactory.getLogger(DelayStatusTransitionCallback.class);
  
      public static final int DEFAULT_DELAY_SECONDS = 30;
  
      protected NimbusData data;
      protected String topologyId;
      protected StormStatus oldStatus;
      protected StatusType newType;
      protected StatusType nextAction;
  
      public DelayStatusTransitionCallback(NimbusData data, String topologyId,
                                           StormStatus oldStatus, StatusType newType, StatusType nextAction) {
          this.data = data;
          this.topologyId = topologyId;
          this.oldStatus = oldStatus;
          this.newType = newType;
          this.nextAction = nextAction;
      }
  
      public int getDelaySeconds(Object[] args) {
          if (oldStatus != null && oldStatus.getDelaySecs() > 0) {
              return oldStatus.getDelaySecs();
          }
  
          Integer delaySecs = DelayStatusTransitionCallback.DEFAULT_DELAY_SECONDS;
          if (args == null || args.length == 0 || args[0] == null) {
              Map<?, ?> map;
              try {
                  map = StormConfig.read_nimbus_topology_conf(topologyId, data.getBlobStore());
                  delaySecs = JStormUtils.parseInt(map.get(Config.TOPOLOGY_MESSAGE_TIMEOUT_SECS), DEFAULT_DELAY_SECONDS);
              } catch (Exception e) {
                  LOG.info("Failed to get topology configuration " + topologyId);
              }
  
          } else {
              delaySecs = JStormUtils.parseInt(args[0]);
          }
  
          if (delaySecs == null || delaySecs < 0) {
              delaySecs = DelayStatusTransitionCallback.DEFAULT_DELAY_SECONDS;
          }
  
          return delaySecs;
      }
  
      @Override
      public <T> Object execute(T... args) {
          int delaySecs = getDelaySeconds(args);
          LOG.info("Delaying event " + newType + " for " + delaySecs + " secs for " + topologyId);
          data.getScheduExec().schedule(new DelayEventRunnable(
                  data, topologyId, nextAction, args), delaySecs, TimeUnit.SECONDS);
  
          return new StormStatus(delaySecs, newType);
      }
  
  }
  