/**
* Copyright 2010 The Apache Software Foundation
*
* 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.assertEquals;
import java.io.IOException;
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.executor.EventHandler.EventType;
import org.apache.hadoop.hbase.executor.ExecutorService.Executor;
import org.apache.hadoop.hbase.executor.ExecutorService.ExecutorType;
import org.junit.Test;
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;
// 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(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());
// 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(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(executor.keepAliveTimeInMillis * 2);
assertEquals(maxThreads, pool.getPoolSize());
}
public static class TestEventHandler extends EventHandler {
private AtomicBoolean lock;
private AtomicInteger counter;
public TestEventHandler(EventType eventType, AtomicBoolean lock,
AtomicInteger counter) {
super(null, 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();
}
}
}