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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.jdisc.Metric;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
/**
* A thread pool executor which maintains the last time a worker completed
* package private for testing
*
* @author Steinar Knutsen
* @author baldersheim
* @author bratseth
*/
class WorkerCompletionTimingThreadPoolExecutor extends ThreadPoolExecutor {
private static final String UNHANDLED_EXCEPTIONS_METRIC = "jdisc.thread_pool.unhandled_exceptions";
volatile long lastThreadAssignmentTimeMillis = System.currentTimeMillis();
private final AtomicLong startedCount = new AtomicLong(0);
private final AtomicLong completedCount = new AtomicLong(0);
private final Metric metric;
WorkerCompletionTimingThreadPoolExecutor(
int corePoolSize,
int maximumPoolSize,
long keepAliveTime,
TimeUnit unit,
BlockingQueue<Runnable> workQueue,
ThreadFactory threadFactory,
Metric metric) {
super(corePoolSize, maximumPoolSize, keepAliveTime, unit, workQueue, threadFactory);
this.metric = metric;
}
@Override
protected void beforeExecute(Thread t, Runnable r) {
super.beforeExecute(t, r);
lastThreadAssignmentTimeMillis = System.currentTimeMillis();
startedCount.incrementAndGet();
}
@Override
protected void afterExecute(Runnable r, Throwable t) {
super.afterExecute(r, t);
completedCount.incrementAndGet();
if (t != null) {
metric.add(UNHANDLED_EXCEPTIONS_METRIC, 1L, metric.createContext(Map.of("exception", t.getClass().getSimpleName())));
}
}
@Override
public int getActiveCount() {
return (int)(startedCount.get() - completedCount.get());
}
}
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