001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.driver.restart;
020
021import org.apache.reef.annotations.Provided;
022import org.apache.reef.annotations.Unstable;
023import org.apache.reef.annotations.audience.Public;
024import org.apache.reef.wake.time.event.StartTime;
025
026import java.util.Set;
027
028/**
029 * Am event encapsulating the time of Driver restart as well as
030 * the set of Evaluator IDs of Evaluators that are expected to
031 * report back to the Driver after restart.
032 */
033@Public
034@Provided
035@Unstable
036public interface DriverRestarted {
037  /**
038   * @return The number of times the Driver has been resubmitted. Not including the initial attempt.
039   */
040  int getResubmissionAttempts();
041
042  /**
043   * @return The time of restart.
044   */
045  StartTime getStartTime();
046
047  /**
048   * @return The set of Evaluator IDs of Evaluators that are expected
049   * to report back to the Driver after restart.
050   */
051  Set<String> getExpectedEvaluatorIds();
052}