org.apache.reef.poison.context.PoissonPoisonedContextStartHandler Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
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*
* http://www.apache.org/licenses/LICENSE-2.0
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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 {
private static final Logger LOG = Logger.getLogger(PoissonPoisonedContextStartHandler.class.getName());
private final Clock clock;
private final int timeToCrash;
@Inject
public 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());
}
}