/*
* Copyright 2015 Odnoklassniki Ltd, Mail.Ru Group
*
* Licensed 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 one.nio.server;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
final class WorkerPool extends ThreadPoolExecutor implements ThreadFactory, Thread.UncaughtExceptionHandler {
private static final Log log = LogFactory.getLog(WorkerPool.class);
private final AtomicInteger index;
WorkerPool(int minThreads, int maxThreads, long queueTime) {
super(minThreads, maxThreads, 60L, TimeUnit.SECONDS, new WaitingSynchronousQueue<Runnable>(queueTime));
setThreadFactory(this);
this.index = new AtomicInteger();
}
void setQueueTime(long queueTime) {
((WaitingSynchronousQueue) getQueue()).queueTime = queueTime;
}
void gracefulShutdown(long timeout) {
shutdown();
try {
awaitTermination(timeout, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
shutdownNow();
}
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r, "NIO Worker #" + index.incrementAndGet());
thread.setUncaughtExceptionHandler(this);
return thread;
}
@Override
public void uncaughtException(Thread t, Throwable e) {
log.error("Uncaught exception in " + t, e);
}
private static final class WaitingSynchronousQueue<E> extends SynchronousQueue<E> {
long queueTime;
WaitingSynchronousQueue(long queueTime) {
this.queueTime = queueTime;
}
@Override
public boolean offer(E element) {
try {
return super.offer(element, queueTime, TimeUnit.MICROSECONDS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return false;
}
}
}
}