| /* |
| * 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.reef.evaluator.context.events.ContextStart; |
| import org.apache.reef.poison.PoisonException; |
| import org.apache.reef.poison.PoisonedAlarmHandler; |
| import org.apache.reef.poison.params.CrashProbability; |
| import org.apache.reef.poison.params.CrashTimeout; |
| 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.Random; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * Fault-injected handler for ContextStart. |
| */ |
| public final class PoisonedContextStartHandler implements EventHandler<ContextStart> { |
| |
| private static final Logger LOG = Logger.getLogger(PoisonedContextStartHandler.class.getName()); |
| |
| private final Random random = new Random(); |
| |
| private final double crashProbability; |
| private final int timeOut; |
| private final Clock clock; |
| |
| @Inject |
| public PoisonedContextStartHandler( |
| @Parameter(CrashProbability.class) final double crashProbability, |
| @Parameter(CrashTimeout.class) final int timeOut, |
| final Clock clock) { |
| |
| this.crashProbability = crashProbability; |
| this.timeOut = timeOut; |
| this.clock = clock; |
| } |
| |
| @Override |
| public void onNext(final ContextStart contextStart) { |
| |
| LOG.log(Level.INFO, "Starting Context poison injector with prescribed dose: {0} units", |
| this.crashProbability); |
| |
| if (this.random.nextDouble() <= this.crashProbability) { |
| |
| final int timeToCrash = this.random.nextInt(this.timeOut) * 1000; |
| LOG.log(Level.INFO, "Dosage lethal! Crashing in {0} msec.", timeToCrash); |
| |
| if (timeToCrash == 0) { |
| throw new PoisonException("Crashed at: " + System.currentTimeMillis()); |
| } else { |
| this.clock.scheduleAlarm(timeToCrash, new PoisonedAlarmHandler()); |
| } |
| |
| } else { |
| LOG.info("Dosage not lethal"); |
| } |
| } |
| } |