de.codecentric.spring.boot.chaos.monkey.assaults.LatencyAssault Maven / Gradle / Ivy

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/*
 * Copyright 2018 the original author or authors.
 *
 * 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 de.codecentric.spring.boot.chaos.monkey.assaults;

import de.codecentric.spring.boot.chaos.monkey.component.MetricEventPublisher;
import de.codecentric.spring.boot.chaos.monkey.component.MetricType;
import de.codecentric.spring.boot.chaos.monkey.configuration.ChaosMonkeySettings;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.atomic.AtomicInteger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/** @author Thorsten Deelmann */
public class LatencyAssault implements ChaosMonkeyRequestAssault {

  private static final Logger Logger = LoggerFactory.getLogger(LatencyAssault.class);

  private final ChaosMonkeySettings settings;

  private final ChaosMonkeyLatencyAssaultExecutor assaultExecutor;

  private MetricEventPublisher metricEventPublisher;

  private AtomicInteger atomicTimeoutGauge;

  public LatencyAssault(
      ChaosMonkeySettings settings,
      MetricEventPublisher metricEventPublisher,
      ChaosMonkeyLatencyAssaultExecutor executor) {
    this.settings = settings;
    this.metricEventPublisher = metricEventPublisher;
    this.atomicTimeoutGauge = new AtomicInteger(0);
    this.assaultExecutor = executor;
  }

  public LatencyAssault(ChaosMonkeySettings settings, MetricEventPublisher metricEventPublisher) {
    this(settings, metricEventPublisher, new LatencyAssaultExecutor());
  }

  @Override
  public boolean isActive() {
    return settings.getAssaultProperties().isLatencyActive();
  }

  @Override
  public void attack() {
    Logger.debug("Chaos Monkey - timeout");

    atomicTimeoutGauge.set(determineLatency());

    // metrics
    if (metricEventPublisher != null) {
      metricEventPublisher.publishMetricEvent(MetricType.LATENCY_ASSAULT);
      metricEventPublisher.publishMetricEvent(MetricType.LATENCY_ASSAULT, atomicTimeoutGauge);
    }

    assaultExecutor.execute(atomicTimeoutGauge.get());
  }

  private int determineLatency() {
    final int latencyRangeStart = settings.getAssaultProperties().getLatencyRangeStart();
    final int latencyRangeEnd = settings.getAssaultProperties().getLatencyRangeEnd();

    if (latencyRangeStart == latencyRangeEnd) {
      return latencyRangeStart;
    } else {
      return ThreadLocalRandom.current().nextInt(latencyRangeStart, latencyRangeEnd);
    }
  }
}