test/jdk/java/nio/channels/AsynchronousFileChannel/CustomThreadPool.java

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/* @test
 * @bug 4607272 6842687
 * @summary Unit test for java.nio.channels.AsynchronousFileChannel
 * @build CustomThreadPool MyThreadFactory
 * @run main/othervm -Djava.nio.channels.DefaultThreadPool.threadFactory=MyThreadFactory CustomThreadPool
 */

import java.io.File;
import static java.nio.file.StandardOpenOption.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.util.concurrent.atomic.AtomicReference;

public class CustomThreadPool {

    public static void main(String[] args) throws Exception {
        File blah = File.createTempFile("blah", null);
        blah.deleteOnExit();
        AsynchronousFileChannel ch =
            AsynchronousFileChannel.open(blah.toPath(), READ, WRITE);
        ByteBuffer src = ByteBuffer.wrap("Scooby Snacks".getBytes());

        final AtomicReference<Thread> invoker = new AtomicReference<Thread>();
        ch.write(src, 0, invoker,
            new CompletionHandler<Integer,AtomicReference<Thread>>() {
                public void completed(Integer result, AtomicReference<Thread> invoker) {
                    invoker.set(Thread.currentThread());
                }
                public void failed(Throwable exc, AtomicReference<Thread> invoker) {
                }
            });
        Thread t;
        while ((t = invoker.get()) == null) {
            Thread.sleep(100);
        }
        ch.close();

        // check handler was run by known thread
        if (!MyThreadFactory.created(t))
            throw new RuntimeException("Handler invoked by unknown thread");
    }
}