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Computing with Data

elgeish
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Thread Pools - Part I

A fixed thread pool maintain the same number of threads even if no task is running. Here's an example of a fixed thread pool in Java:

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
public class Main {
public static void main(String args[]) throws Exception {
final ExecutorService threadPool = Executors.newFixedThreadPool(3);
final long startTime = System.nanoTime();
for (int i = 0; i < 10; i++) {
threadPool.submit(() ->doWork(startTime));
}
threadPool.shutdown();
if (threadPool.awaitTermination(1, TimeUnit.SECONDS)) {
System.out.println("Thread pool terminated gracefully.");
} else {
System.err.println("Thread pool timed out!");
}
}
private static void doWork(final long startTime) {
System.out.println("Timestamp: " + (System.nanoTime() - startTime));
try {
Thread.sleep(100);
} catch (InterruptedException ex) {
System.out.println(ex);
}
}
}
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