/**
* 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.hadoop.hbase.chaos.policies;
import org.apache.commons.lang.math.RandomUtils;
import org.apache.hadoop.hbase.util.Threads;
/** A policy which does stuff every time interval. */
public abstract class PeriodicPolicy extends Policy {
private long periodMs;
public PeriodicPolicy(long periodMs) {
this.periodMs = periodMs;
}
@Override
public void run() {
// Add some jitter.
int jitter = RandomUtils.nextInt((int) periodMs);
LOG.info("Sleeping for " + jitter + " to add jitter");
Threads.sleep(jitter);
while (!isStopped()) {
long start = System.currentTimeMillis();
runOneIteration();
if (isStopped()) return;
long sleepTime = periodMs - (System.currentTimeMillis() - start);
if (sleepTime > 0) {
LOG.info("Sleeping for: " + sleepTime);
Threads.sleep(sleepTime);
}
}
}
protected abstract void runOneIteration();
@Override
public void init(PolicyContext context) throws Exception {
super.init(context);
LOG.info("Using ChaosMonkey Policy: " + this.getClass() + ", period: " + periodMs);
}
}