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.callback.BaseCallback;
  import com.alibaba.jstorm.cluster.StormStatus;
  import com.alibaba.jstorm.daemon.nimbus.NimbusData;
  import com.alibaba.jstorm.daemon.nimbus.TopologyAssign;
  import com.alibaba.jstorm.daemon.nimbus.TopologyAssignEvent;
  
  /**
   * 1. call MonitorRunnable every Config.NIMBUS_MONITOR_FREQ_SECS
   * 2. MonitorRunnable will call NimbusData.transition
   * 3. NimbusData.transition will then call this callback
   */
  public class ReassignTransitionCallback extends BaseCallback {
  
      private NimbusData data;
      private String topologyId;
      private StormStatus oldStatus;
  
      public ReassignTransitionCallback(NimbusData data, String topologyId) {
          this.data = data;
          this.topologyId = topologyId;
          this.oldStatus = null;
      }
  
      public ReassignTransitionCallback(NimbusData data, String topologyId, StormStatus oldStatus) {
          this.data = data;
          this.topologyId = topologyId;
          this.oldStatus = oldStatus;
      }
  
      @Override
      public <T> Object execute(T... args) {
          // default is true
          TopologyAssignEvent assignEvent = new TopologyAssignEvent();
          assignEvent.setTopologyId(topologyId);
          assignEvent.setScratch(false);
          assignEvent.setOldStatus(oldStatus);
  
          TopologyAssign.push(assignEvent);
          assignEvent.waitFinish();
  
          return null;
      }
  
  }
  