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 org.apache.ambari.server.topology.tasks;
  
  import java.util.Set;
  
  import org.apache.ambari.server.RoleCommand;
  
  import com.google.common.collect.ImmutableSet;
  
  /**
   * Task which is executed by the TopologyManager.
   */
  public interface TopologyTask extends Runnable {
    /**
     * Task type.
     */
    enum Type {
      RESOURCE_CREATION,
      CONFIGURE,
      INSTALL,
      START {
        @Override
        public Set<RoleCommand> tasksToAbortOnFailure() {
          return ImmutableSet.of(RoleCommand.START);
        }
      },
      ;
  
      private static Set<RoleCommand> ALL_TASKS = ImmutableSet.of(RoleCommand.INSTALL, RoleCommand.START);
  
      public Set<RoleCommand> tasksToAbortOnFailure() {
        return ALL_TASKS;
      }
    }
  
    /**
     * Get the task type.
     *
     * @return the type of task
     */
    Type getType();
  }
  