org.apache.hadoop.hbase.chaos.util.Monkeys.java Source code

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Here is the source code for org.apache.hadoop.hbase.chaos.util.Monkeys.java

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/**
 * 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.util;

import java.io.Closeable;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.IntegrationTestingUtility;
import org.apache.hadoop.hbase.shaded.com.google.common.base.Preconditions;
import org.apache.hadoop.hbase.shaded.com.google.common.util.concurrent.ThreadFactoryBuilder;

/**
 * This class can be used to control chaos monkeys life cycle.
 */
public class Monkeys implements Closeable {
    private static final Log LOG = LogFactory.getLog(Monkeys.class);

    private final Configuration conf;
    private final ChaosMonkeyRunner monkeyRunner;
    private final Runnable runner;
    private final ExecutorService executor;

    public Monkeys() {
        this(HBaseConfiguration.create());
    }

    public Monkeys(Configuration conf) {
        this.conf = Preconditions.checkNotNull(conf, "Should specify a configuration");
        this.monkeyRunner = new ChaosMonkeyRunner();
        this.runner = () -> {
            try {
                monkeyRunner.getAndStartMonkey();
            } catch (Exception e) {
                LOG.error("Exception occured when running chaos monkeys: ", e);
            }
        };
        this.executor = Executors.newSingleThreadExecutor(
                new ThreadFactoryBuilder().setDaemon(true).setNameFormat("ChaosMonkey").build());
        IntegrationTestingUtility.setUseDistributedCluster(this.conf);
    }

    public void addResource(Configuration otherConf) {
        conf.addResource(otherConf);
        monkeyRunner.setConf(conf);
    }

    public void addResource(String otherConf) {
        conf.addResource(otherConf);
        monkeyRunner.setConf(conf);
    }

    public void startChaos() {
        executor.execute(runner);
        LOG.info("Chaos monkeys are running.");
    }

    public void stopChaos() {
        monkeyRunner.stopRunner();
        LOG.info("Chaos monkeys are stopped.");
    }

    @Override
    public void close() throws IOException {
        executor.shutdown();
        try {
            // wait 10 seconds.
            executor.awaitTermination(10, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            LOG.warn("Interruption occured while stopping chaos monkeys " + e);
        }
    }
}