/**
* 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.hadoop.hbase.DaemonThreadFactory;
import org.apache.hadoop.hbase.chaos.actions.Action;
import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
import org.apache.hadoop.util.StringUtils;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
/**
* Chaos Monkey policy that will run two different actions at the same time.
* A random action from each array of actions will be chosen and then run in parallel.
*/
public class TwoConcurrentActionPolicy extends PeriodicPolicy {
private final Action[] actionsOne;
private final Action[] actionsTwo;
private final ExecutorService executor;
public TwoConcurrentActionPolicy(long sleepTime, Action[] actionsOne, Action[] actionsTwo) {
super(sleepTime);
this.actionsOne = actionsOne;
this.actionsTwo = actionsTwo;
executor = Executors.newFixedThreadPool(2,
new DaemonThreadFactory("TwoConcurrentAction-"));
}
@Override
protected void runOneIteration() {
Action actionOne = PolicyBasedChaosMonkey.selectRandomItem(actionsOne);
Action actionTwo = PolicyBasedChaosMonkey.selectRandomItem(actionsTwo);
Future fOne = executor.submit(new ActionRunner(actionOne));
Future fTwo = executor.submit(new ActionRunner(actionTwo));
try {
fOne.get();
fTwo.get();
} catch (InterruptedException e) {
LOG.warn("Exception occurred during performing action: "
+ StringUtils.stringifyException(e));
} catch (ExecutionException ex) {
LOG.warn("Exception occurred during performing action: "
+ StringUtils.stringifyException(ex));
}
}
@Override
public void init(PolicyContext context) throws Exception {
super.init(context);
for (Action a : actionsOne) {
a.init(context);
}
for (Action a : actionsTwo) {
a.init(context);
}
}
private static class ActionRunner implements Runnable {
private final Action action;
public ActionRunner(Action action) {
this.action = action;
}
@Override public void run() {
try {
action.perform();
} catch (Exception ex) {
LOG.warn("Exception occurred during performing action: "
+ StringUtils.stringifyException(ex));
}
}
}
}