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Source code
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.runtime.common.driver.idle;
020
021import org.apache.reef.runtime.common.driver.evaluator.Evaluators;
022import org.apache.reef.tang.InjectionFuture;
023
024import javax.inject.Inject;
025
026/**
027 * Checks for idleness of the Event handlers.
028 */
029public final class EventHandlerIdlenessSource implements DriverIdlenessSource {
030
031  private static final IdleMessage IDLE_MESSAGE =
032      new IdleMessage("EventHandlers", "All events have been processed.", true);
033  private static final IdleMessage NOT_IDLE_MESSAGE =
034      new IdleMessage("EventHandlers", "Some events are still in flight.", false);
035
036  private final InjectionFuture<Evaluators> evaluators;
037  private final InjectionFuture<DriverIdleManager> driverIdleManager;
038
039  @Inject
040  EventHandlerIdlenessSource(final InjectionFuture<Evaluators> evaluators,
041                             final InjectionFuture<DriverIdleManager> driverIdleManager) {
042    this.evaluators = evaluators;
043    this.driverIdleManager = driverIdleManager;
044  }
045
046
047  @Override
048  public IdleMessage getIdleStatus() {
049    if (this.evaluators.get().allEvaluatorsAreClosed()) {
050      return IDLE_MESSAGE;
051    } else {
052      return NOT_IDLE_MESSAGE;
053    }
054  }
055
056  public void check() {
057    if (this.evaluators.get().allEvaluatorsAreClosed()) {
058      this.driverIdleManager.get().onPotentiallyIdle(IDLE_MESSAGE);
059    }
060  }
061}