org.apache.hadoop.hbase.executor.TestExecutorService.java Source code

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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.executor;

import static org.junit.Assert.*;
import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.io.StringWriter;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.executor.ExecutorService.Executor;
import org.apache.hadoop.hbase.executor.ExecutorService.ExecutorStatus;
import org.apache.hadoop.hbase.executor.ExecutorType;
import org.junit.Test;
import org.junit.experimental.categories.Category;

import static org.mockito.Mockito.*;

@Category(SmallTests.class)
public class TestExecutorService {
    private static final Log LOG = LogFactory.getLog(TestExecutorService.class);

    @Test
    public void testExecutorService() throws Exception {
        int maxThreads = 5;
        int maxTries = 10;
        int sleepInterval = 10;

        Server mockedServer = mock(Server.class);
        when(mockedServer.getConfiguration()).thenReturn(HBaseConfiguration.create());

        // Start an executor service pool with max 5 threads
        ExecutorService executorService = new ExecutorService("unit_test");
        executorService.startExecutorService(ExecutorType.MASTER_SERVER_OPERATIONS, maxThreads);

        Executor executor = executorService.getExecutor(ExecutorType.MASTER_SERVER_OPERATIONS);
        ThreadPoolExecutor pool = executor.threadPoolExecutor;

        // Assert no threads yet
        assertEquals(0, pool.getPoolSize());

        AtomicBoolean lock = new AtomicBoolean(true);
        AtomicInteger counter = new AtomicInteger(0);

        // Submit maxThreads executors.
        for (int i = 0; i < maxThreads; i++) {
            executorService.submit(new TestEventHandler(mockedServer, EventType.M_SERVER_SHUTDOWN, lock, counter));
        }

        // The TestEventHandler will increment counter when it starts.
        int tries = 0;
        while (counter.get() < maxThreads && tries < maxTries) {
            LOG.info("Waiting for all event handlers to start...");
            Thread.sleep(sleepInterval);
            tries++;
        }

        // Assert that pool is at max threads.
        assertEquals(maxThreads, counter.get());
        assertEquals(maxThreads, pool.getPoolSize());

        ExecutorStatus status = executor.getStatus();
        assertTrue(status.queuedEvents.isEmpty());
        assertEquals(5, status.running.size());
        checkStatusDump(status);

        // Now interrupt the running Executor
        synchronized (lock) {
            lock.set(false);
            lock.notifyAll();
        }

        // Executor increments counter again on way out so.... test that happened.
        while (counter.get() < (maxThreads * 2) && tries < maxTries) {
            System.out.println("Waiting for all event handlers to finish...");
            Thread.sleep(sleepInterval);
            tries++;
        }

        assertEquals(maxThreads * 2, counter.get());
        assertEquals(maxThreads, pool.getPoolSize());

        // Add more than the number of threads items.
        // Make sure we don't get RejectedExecutionException.
        for (int i = 0; i < (2 * maxThreads); i++) {
            executorService.submit(new TestEventHandler(mockedServer, EventType.M_SERVER_SHUTDOWN, lock, counter));
        }
        // Now interrupt the running Executor
        synchronized (lock) {
            lock.set(false);
            lock.notifyAll();
        }

        // Make sure threads are still around even after their timetolive expires.
        Thread.sleep(ExecutorService.Executor.keepAliveTimeInMillis * 2);
        assertEquals(maxThreads, pool.getPoolSize());

        executorService.shutdown();

        assertEquals(0, executorService.getAllExecutorStatuses().size());

        // Test that submit doesn't throw NPEs
        executorService.submit(new TestEventHandler(mockedServer, EventType.M_SERVER_SHUTDOWN, lock, counter));
    }

    private void checkStatusDump(ExecutorStatus status) throws IOException {
        StringWriter sw = new StringWriter();
        status.dumpTo(sw, "");
        String dump = sw.toString();
        LOG.info("Got status dump:\n" + dump);

        assertTrue(dump.contains("Waiting on java.util.concurrent.atomic.AtomicBoolean"));
    }

    public static class TestEventHandler extends EventHandler {
        private AtomicBoolean lock;
        private AtomicInteger counter;

        public TestEventHandler(Server server, EventType eventType, AtomicBoolean lock, AtomicInteger counter) {
            super(server, eventType);
            this.lock = lock;
            this.counter = counter;
        }

        @Override
        public void process() throws IOException {
            int num = counter.incrementAndGet();
            LOG.info("Running process #" + num + ", threadName=" + Thread.currentThread().getName());
            synchronized (lock) {
                while (lock.get()) {
                    try {
                        lock.wait();
                    } catch (InterruptedException e) {
                        // do nothing
                    }
                }
            }
            counter.incrementAndGet();
        }
    }

}