test/java/rmi/transport/rapidExportUnexport/RapidExportUnexport.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * 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,
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/* @test
 * @bug 6275081
 * @summary Rapidly alternating the number of remote objects exported
 * on an explicit port between zero and greater than zero (thus
 * causing the associated server socket to be created and closed
 * repeatedly) should not encounter substantial synchronous delays
 * because of the server socket accept loop's failure throttling
 * procedure (which sleeps 10 seconds after 10 rapid failures).
 * @author Peter Jones
 *
 * @build RapidExportUnexport
 * @run main/othervm RapidExportUnexport
 */

import java.rmi.Remote;
import java.rmi.server.UnicastRemoteObject;

public class RapidExportUnexport {

    private static final int PORT = 2055;

    private static final int REPS = 100;
    private static final long TIMEOUT = 60000;

    public static void main(String[] args) throws Exception {
        System.err.println("\nRegression test for bug 6275081\n");

        Remote impl = new Remote() { };
        long start = System.currentTimeMillis();
        for (int i = 0; i < REPS; i++) {
            System.err.println(i);
            UnicastRemoteObject.exportObject(impl, PORT);
            UnicastRemoteObject.unexportObject(impl, true);
            Thread.sleep(1);    // work around BindException (bug?)
        }
        long delta = System.currentTimeMillis() - start;
        System.err.println(REPS + " export/unexport operations took " +
                           delta + "ms");
        if (delta > TIMEOUT) {
            throw new Error("TEST FAILED: took over " + TIMEOUT + "ms");
        }
        System.err.println("TEST PASSED");
    }
}