com.microsoft.reef.poison.context.PoissonPoisonedContextStartHandler Maven / Gradle / Ivy
/**
* Copyright (C) 2014 Microsoft Corporation
*
* Licensed 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 com.microsoft.reef.poison.context;
import com.microsoft.reef.evaluator.context.events.ContextStart;
import com.microsoft.reef.poison.PoisonedAlarmHandler;
import com.microsoft.reef.poison.params.CrashProbability;
import com.microsoft.tang.annotations.Parameter;
import com.microsoft.wake.EventHandler;
import com.microsoft.wake.time.Clock;
import org.apache.commons.math3.distribution.PoissonDistribution;
import javax.inject.Inject;
import java.util.logging.Level;
import java.util.logging.Logger;
final class PoissonPoisonedContextStartHandler implements EventHandler {
private static final Logger LOG = Logger.getLogger(PoissonPoisonedContextStartHandler.class.getName());
private final Clock clock;
private final int timeToCrash;
@Inject
public PoissonPoisonedContextStartHandler(
final @Parameter(CrashProbability.class) 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());
}
}