test/jdk/java/net/ServerSocket/IsClosedAfterAsyncClose.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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 */

/**
 * @test
 * @bug 8278339
 * @summary Test that ServerSocket::isClosed returns true after async close
 */

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class IsClosedAfterAsyncClose {

    private static final int ITERATIONS = 100;

    public static void main(String[] args) throws Exception {
        for (int i = 0; i < ITERATIONS; i++) {
            System.out.printf("Test %d...%n", i);

            // create listener bound to the loopback address
            ServerSocket listener = new ServerSocket();
            InetAddress loopback = InetAddress.getLoopbackAddress();
            listener.bind(new InetSocketAddress(loopback, 0));

            // task to close listener after a delay
            Runnable closeListener = () -> {
                try {
                    Thread.sleep(100);
                    listener.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            };

            // main thread blocks in accept. When listener is closed then accept
            // should wakeup with an IOException and isClosed should be true.
            try (listener) {
                Thread closer = new Thread(closeListener);
                closer.start();
                try {
                    while (true) {
                        Socket s = listener.accept();
                        // close spurious connection
                        s.close();
                    }
                } catch (IOException ioe) {
                    if (!listener.isClosed()) {
                        throw new RuntimeException("isClosed returned false!!");
                    }
                } finally {
                    closer.join();
                }
            }
        }
    }
}