| /* |
| * 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. |
| */ |
| package org.apache.reef.poison.context; |
| |
| import org.apache.commons.math3.distribution.PoissonDistribution; |
| import org.apache.reef.evaluator.context.events.ContextStart; |
| import org.apache.reef.poison.PoisonedAlarmHandler; |
| import org.apache.reef.poison.params.CrashProbability; |
| import org.apache.reef.tang.annotations.Parameter; |
| import org.apache.reef.wake.EventHandler; |
| import org.apache.reef.wake.time.Clock; |
| |
| import javax.inject.Inject; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| final class PoissonPoisonedContextStartHandler implements EventHandler<ContextStart> { |
| |
| private static final Logger LOG = Logger.getLogger(PoissonPoisonedContextStartHandler.class.getName()); |
| |
| private final Clock clock; |
| private final int timeToCrash; |
| |
| @Inject |
| PoissonPoisonedContextStartHandler( |
| @Parameter(CrashProbability.class) final double lambda, final Clock clock) { |
| |
| this.clock = clock; |
| this.timeToCrash = new PoissonDistribution(lambda * 1000).sample(); |
| |
| LOG.log(Level.INFO, |
| "Created Poisson poison injector with prescribed dose: {0}. Crash in {1} msec.", |
| new Object[]{lambda, this.timeToCrash}); |
| } |
| |
| @Override |
| public void onNext(final ContextStart contextStart) { |
| LOG.log(Level.INFO, "Started Poisson poison injector. Crashing in {0} msec.", this.timeToCrash); |
| this.clock.scheduleAlarm(this.timeToCrash, new PoisonedAlarmHandler()); |
| } |
| } |