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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.handler.threadpool;
import com.yahoo.concurrent.ThreadFactoryFactory;
import com.yahoo.container.handler.ThreadpoolConfig;
import com.yahoo.container.protect.ProcessTerminator;
import com.yahoo.jdisc.Metric;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Executor;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.TimeUnit;
/**
* A configurable thread pool. This provides the worker threads used for normal request processing.
*
* @author Steinar Knutsen
* @author baldersheim
* @author bratseth
* @author bjorncs
*/
public class ContainerThreadPool implements AutoCloseable {
private final ExecutorServiceWrapper threadpool;
public ContainerThreadPool(ThreadpoolConfig config, Metric metric) {
this(config, metric, new ProcessTerminator());
}
public ContainerThreadPool(ThreadpoolConfig threadpoolConfig, Metric metric, ProcessTerminator processTerminator) {
ThreadPoolMetric threadPoolMetric = new ThreadPoolMetric(metric, threadpoolConfig.name());
int maxNumThreads = computeMaximumThreadPoolSize(threadpoolConfig.maxthreads());
int coreNumThreads = computeCoreThreadPoolSize(threadpoolConfig.corePoolSize(), maxNumThreads);
WorkerCompletionTimingThreadPoolExecutor executor =
new WorkerCompletionTimingThreadPoolExecutor(coreNumThreads, maxNumThreads,
(int)threadpoolConfig.keepAliveTime() * 1000, TimeUnit.MILLISECONDS,
createQ(threadpoolConfig.queueSize(), maxNumThreads),
ThreadFactoryFactory.getThreadFactory(threadpoolConfig.name()),
threadPoolMetric);
// Prestart needed, if not all threads will be created by the fist N tasks and hence they might also
// get the dreaded thread locals initialized even if they will never run.
// That counters what we we want to achieve with the Q that will prefer thread locality.
executor.prestartAllCoreThreads();
threadpool = new ExecutorServiceWrapper(executor, threadPoolMetric, processTerminator,
threadpoolConfig.maxThreadExecutionTimeSeconds() * 1000L);
}
public Executor executor() { return threadpool; }
@Override public void close() { closeInternal(); }
/**
* Shutdown the thread pool, give a grace period of 1 second before forcibly
* shutting down all worker threads.
*/
private void closeInternal() {
boolean terminated;
threadpool.shutdown();
try {
terminated = threadpool.awaitTermination(1, TimeUnit.SECONDS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return;
}
if (!terminated) {
threadpool.shutdownNow();
}
}
private static BlockingQueue<Runnable> createQ(int queueSize, int maxThreads) {
return (queueSize == 0)
? new SynchronousQueue<>(false)
: (queueSize < 0)
? new ArrayBlockingQueue<>(maxThreads*4)
: new ArrayBlockingQueue<>(queueSize);
}
private static int computeMaximumThreadPoolSize(int maxNumThreads) {
return (maxNumThreads <= 0)
? Runtime.getRuntime().availableProcessors() * 4
: maxNumThreads;
}
private static int computeCoreThreadPoolSize(int corePoolSize, int maxNumThreads) {
return Math.min(corePoolSize, maxNumThreads);
}
}
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