helix-core/src/main/java/org/apache/helix/task/Task.java

package org.apache.helix.task;

/*
 * 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.
 */

/**
 * The interface that is to be implemented by a specific task implementation.
 */
public interface Task {
  /**
   * Execute the task.
   * @return A {@link TaskResult} object indicating the status of the task and any additional
   *         context
   *         information that
   *         can be interpreted by the specific {@link Task} implementation.
   */
  TaskResult run();

  /**
   * Signals the task to stop execution. The task implementation should carry out any clean up
   * actions that may be
   * required and return from the {@link #run()} method.
   */
  void cancel();
}