/*

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 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * 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).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/* @test

 * @bug 4285878

 * @summary When the "java.rmi.dgc.leaseValue" system property is set to a

 * value much lower than its default (10 minutes), then the server-side

 * user-visible detection of DGC lease expiration-- in the form of

 * Unreferenced.unreferenced() invocations and possibly even local garbage

 * collection (including weak reference notification, finalization, etc.)--

 * may be delayed longer than expected.  While this is not a spec violation

 * (because there are no timeliness guarantees for any of these garbage

 * collection-related events), the user might expect that an unreferenced()

 * invocation for an object whose last client has terminated abnorally

 * should occur on relatively the same time order as the lease value

 * granted.

 * @author Peter Jones

 *

 * @library ../../../testlibrary

 * @build TestLibrary

 * @build JavaVM

 * @build LeaseCheckInterval

 * @build LeaseCheckInterval_Stub

 * @build SelfTerminator

 * @run main/othervm LeaseCheckInterval

 */

import java.rmi.Remote;

import java.rmi.RemoteException;

import java.rmi.registry.LocateRegistry;

import java.rmi.registry.Registry;

import java.rmi.server.UnicastRemoteObject;

import java.rmi.server.Unreferenced;

public class LeaseCheckInterval implements Remote, Unreferenced {

    public static final String BINDING = "LeaseCheckInterval";

    private static final long LEASE_VALUE = 10000;

    private static final long TIMEOUT = 20000;

    private Object lock = new Object();

    private boolean unreferencedInvoked = false;

    public void unreferenced() {

        System.err.println("unreferenced() method invoked");

        synchronized (lock) {

            unreferencedInvoked = true;

            lock.notify();

        }

    }

    public static void main(String[] args) throws Exception {

        System.err.println("\nRegression test for bug 4285878\n");

        /*

         * Set the duration of leases granted to a very small value, so that

         * we can test if expirations are detected in a roughly comparable

         * time.

         */

        System.setProperty("java.rmi.dgc.leaseValue",

                           String.valueOf(LEASE_VALUE));

        LeaseCheckInterval obj = new LeaseCheckInterval();

        try {

            UnicastRemoteObject.exportObject(obj);

            System.err.println("exported remote object");

            Registry localRegistry =

                LocateRegistry.createRegistry(TestLibrary.REGISTRY_PORT);

            System.err.println("created local registry");

            localRegistry.bind(BINDING, obj);

            System.err.println("bound remote object in local registry");

            synchronized (obj.lock) {

                System.err.println("starting remote client VM...");

                (new JavaVM("SelfTerminator")).start();

                System.err.println("waiting for unreferenced() callback...");

                obj.lock.wait(TIMEOUT);

                if (obj.unreferencedInvoked) {

                    System.err.println("TEST PASSED: " +

                        "unreferenced() invoked in timely fashion");

                } else {

                    throw new RuntimeException(

                        "TEST FAILED: unreferenced() not invoked after " +

                        ((double) TIMEOUT / 1000.0) + " seconds");

                }

            }

        } catch (Exception e) {

            if (e instanceof RuntimeException) {

                throw (RuntimeException) e;

            } else {

                throw new RuntimeException(

                    "TEST FAILED: unexpected exception: " + e.toString());

            }

        } finally {

            /*

             * When all is said and done, try to unexport the remote object

             * so that the VM has a chance to exit.

             */

            try {

                UnicastRemoteObject.unexportObject(obj, true);

            } catch (RemoteException e) {

            }

        }

    }

}