/* 
 * Copyright 2001 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * 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) {
	    }
	}
    }
}