com.netflix.nfsidecar.scheduler.BlockingSubmitThreadPoolExecutor Maven / Gradle / Ivy
/**
* Copyright 2013 Netflix, Inc.
*
* 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 com.netflix.nfsidecar.scheduler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
/**
* {@link ThreadPoolExecutor} that will block in the {@code submit()} method
* until the task can be successfully added to the queue.
*/
public class BlockingSubmitThreadPoolExecutor extends ThreadPoolExecutor
{
private static final long DEFAULT_SLEEP = 100;
private static final long DEFAULT_KEEP_ALIVE = 100;
private static final Logger logger = LoggerFactory.getLogger(BlockingSubmitThreadPoolExecutor.class);
private BlockingQueue queue;
private long giveupTime;
private AtomicInteger active;
public BlockingSubmitThreadPoolExecutor(int maximumPoolSize, BlockingQueue workQueue, long timeoutAdding)
{
super(maximumPoolSize, maximumPoolSize, DEFAULT_KEEP_ALIVE, TimeUnit.SECONDS, workQueue);
this.queue = workQueue;
this.giveupTime = timeoutAdding;
this.active = new AtomicInteger(0);
}
/**
* This is a thread safe way to avoid rejection exception... this is
* implemented because we might want to hold the incoming requests till
* there is a free thread.
*/
@Override
public Future submit(Callable task)
{
synchronized (this)
{
active.incrementAndGet();
long timeout = 0;
while (queue.remainingCapacity() == 0)
{
try
{
if (timeout <= giveupTime)
{
Thread.sleep(DEFAULT_SLEEP);
timeout += DEFAULT_SLEEP;
}
else
{
throw new RuntimeException("Timed out because TPE is too busy...");
}
}
catch (InterruptedException e)
{
throw new RuntimeException(e);
}
}
return super.submit(task);
}
}
@Override
protected void afterExecute(Runnable r, Throwable t)
{
super.afterExecute(r, t);
active.decrementAndGet();
}
/**
* blocking call to test if the threads are done or not.
*/
public void sleepTillEmpty()
{
long timeout = 0;
while (!queue.isEmpty() || (active.get() > 0))
{
try
{
if (timeout <= giveupTime)
{
Thread.sleep(DEFAULT_SLEEP);
timeout += DEFAULT_SLEEP;
logger.debug("After Sleeping for empty: {}, Count: {}", +queue.size(), active.get());
}
else
{
throw new RuntimeException("Timed out because TPE is too busy...");
}
}
catch (InterruptedException e)
{
throw new RuntimeException(e);
}
}
}
}
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