001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.hbase.chaos.policies;
020
021import org.apache.hadoop.hbase.chaos.actions.Action;
022import org.apache.hadoop.hbase.chaos.monkies.PolicyBasedChaosMonkey;
023import org.apache.hadoop.hbase.util.Threads;
024import org.apache.hadoop.util.StringUtils;
025import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;
026
027import java.util.concurrent.ExecutionException;
028import java.util.concurrent.ExecutorService;
029import java.util.concurrent.Executors;
030import java.util.concurrent.Future;
031
032/**
033 * Chaos Monkey policy that will run two different actions at the same time.
034 * A random action from each array of actions will be chosen and then run in parallel.
035 */
036public class TwoConcurrentActionPolicy extends PeriodicPolicy {
037  private final Action[] actionsOne;
038  private final Action[] actionsTwo;
039  private final ExecutorService executor;
040
041  public TwoConcurrentActionPolicy(long sleepTime, Action[] actionsOne, Action[] actionsTwo) {
042    super(sleepTime);
043    this.actionsOne = actionsOne;
044    this.actionsTwo = actionsTwo;
045    executor = Executors.newFixedThreadPool(2,
046      new ThreadFactoryBuilder().setNameFormat("TwoConcurrentAction-pool-%d").setDaemon(true)
047        .setUncaughtExceptionHandler(Threads.LOGGING_EXCEPTION_HANDLER).build());
048  }
049
050  @Override
051  protected void runOneIteration() {
052    Action actionOne = PolicyBasedChaosMonkey.selectRandomItem(actionsOne);
053    Action actionTwo = PolicyBasedChaosMonkey.selectRandomItem(actionsTwo);
054
055    Future fOne = executor.submit(new ActionRunner(actionOne));
056    Future fTwo = executor.submit(new ActionRunner(actionTwo));
057
058    try {
059      fOne.get();
060      fTwo.get();
061    } catch (InterruptedException e) {
062      LOG.warn("Exception occurred during performing action: "
063          + StringUtils.stringifyException(e));
064    } catch (ExecutionException ex) {
065      LOG.warn("Exception occurred during performing action: "
066          + StringUtils.stringifyException(ex));
067    }
068  }
069
070  @Override
071  public void init(PolicyContext context) throws Exception {
072    super.init(context);
073    for (Action a : actionsOne) {
074      a.init(context);
075    }
076    for (Action a : actionsTwo) {
077      a.init(context);
078    }
079  }
080
081  private static class ActionRunner implements Runnable {
082
083    private final Action action;
084
085    public ActionRunner(Action action) {
086
087      this.action = action;
088    }
089
090    @Override public void run() {
091      try {
092        action.perform();
093      } catch (Exception ex) {
094        LOG.warn("Exception occurred during performing action: "
095            + StringUtils.stringifyException(ex));
096      }
097    }
098  }
099}