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.driver.evaluator.AllocatedEvaluator;
022import org.apache.reef.wake.EventHandler;
023
024import javax.inject.Inject;
025
026/**
027 * Records allocated evaluators for recovery on driver restart by using a DriverRuntimeRestartManager.
028 */
029public final class EvaluatorPreservingEvaluatorAllocatedHandler implements EventHandler<AllocatedEvaluator> {
030  private final DriverRestartManager driverRestartManager;
031
032  @Inject
033  private EvaluatorPreservingEvaluatorAllocatedHandler(final DriverRestartManager driverRestartManager) {
034    this.driverRestartManager = driverRestartManager;
035  }
036
037  /**
038   * Records the allocatedEvaluator ID with the DriverRuntimeRestartManager.
039   * @param value the allocated evaluator event.
040   */
041  @Override
042  public void onNext(final AllocatedEvaluator value) {
043    this.driverRestartManager.recordAllocatedEvaluator(value.getId());
044  }
045}