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 = new IdleMessage("EventHandlers", "All events have been processed.", true);
032  private static final IdleMessage NOT_IDLE_MESSAGE = new IdleMessage("EventHandlers", "Some events are still in flight.", true);
033
034  private final InjectionFuture<Evaluators> evaluators;
035  private final InjectionFuture<DriverIdleManager> driverIdleManager;
036
037  @Inject
038  EventHandlerIdlenessSource(final InjectionFuture<Evaluators> evaluators,
039                             final InjectionFuture<DriverIdleManager> driverIdleManager) {
040    this.evaluators = evaluators;
041    this.driverIdleManager = driverIdleManager;
042  }
043
044
045  @Override
046  public IdleMessage getIdleStatus() {
047    if (this.evaluators.get().allEvaluatorsAreClosed()) {
048      return IDLE_MESSAGE;
049    } else {
050      return NOT_IDLE_MESSAGE;
051    }
052  }
053
054  public void check() {
055    if (this.evaluators.get().allEvaluatorsAreClosed()) {
056      this.driverIdleManager.get().onPotentiallyIdle(IDLE_MESSAGE);
057    }
058  }
059}