Turning an ExecutorService to daemon in Java

Question

I am using an ExecutoreService in Java 1.6, started simply by

ExecutorService pool = Executors.newFixedThreadPool(THREADS). 

When my main

Answer 1

You can use Guava's ThreadFactoryBuilder. I didn't want to add the dependency and I wanted the functionality from Executors.DefaultThreadFactory, so I used composition:

class DaemonThreadFactory implements ThreadFactory {
    final ThreadFactory delegate;

    DaemonThreadFactory() {
        this(Executors.defaultThreadFactory());
    }

    DaemonThreadFactory(ThreadFactory delegate) {
        this.delegate = delegate;
    }

    @Override
    public Thread newThread(Runnable r) {
        Thread thread = delegate.newThread(r);
        thread.setDaemon(true);
        return thread;
    }
}