1/*
2 * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/* @test
25 * @bug 4285878
26 * @summary When the "java.rmi.dgc.leaseValue" system property is set to a
27 * value much lower than its default (10 minutes), then the server-side
28 * user-visible detection of DGC lease expiration-- in the form of
29 * Unreferenced.unreferenced() invocations and possibly even local garbage
30 * collection (including weak reference notification, finalization, etc.)--
31 * may be delayed longer than expected.  While this is not a spec violation
32 * (because there are no timeliness guarantees for any of these garbage
33 * collection-related events), the user might expect that an unreferenced()
34 * invocation for an object whose last client has terminated abnorally
35 * should occur on relatively the same time order as the lease value
36 * granted.
37 * @author Peter Jones
38 *
39 * @library ../../../testlibrary
40 * @modules java.rmi/sun.rmi.registry
41 *          java.rmi/sun.rmi.server
42 *          java.rmi/sun.rmi.transport
43 *          java.rmi/sun.rmi.transport.tcp
44 * @build TestLibrary JavaVM LeaseCheckInterval_Stub SelfTerminator
45 * @run main/othervm LeaseCheckInterval
46 */
47
48import java.rmi.Remote;
49import java.rmi.RemoteException;
50import java.rmi.registry.LocateRegistry;
51import java.rmi.registry.Registry;
52import java.rmi.server.UnicastRemoteObject;
53import java.rmi.server.Unreferenced;
54
55public class LeaseCheckInterval implements Remote, Unreferenced {
56
57    public static final String BINDING = "LeaseCheckInterval";
58    private static final long LEASE_VALUE = 10000;
59    private static final long TIMEOUT = 20000;
60
61    private Object lock = new Object();
62    private boolean unreferencedInvoked = false;
63
64    public void unreferenced() {
65        System.err.println("unreferenced() method invoked");
66        synchronized (lock) {
67            unreferencedInvoked = true;
68            lock.notify();
69        }
70    }
71
72    public static void main(String[] args) throws Exception {
73
74        System.err.println("\nRegression test for bug 4285878\n");
75
76        /*
77         * Set the duration of leases granted to a very small value, so that
78         * we can test if expirations are detected in a roughly comparable
79         * time.
80         */
81        System.setProperty("java.rmi.dgc.leaseValue",
82                           String.valueOf(LEASE_VALUE));
83
84        LeaseCheckInterval obj = new LeaseCheckInterval();
85        JavaVM jvm = null;
86
87        try {
88            UnicastRemoteObject.exportObject(obj);
89            System.err.println("exported remote object");
90
91            Registry localRegistry = TestLibrary.createRegistryOnEphemeralPort();
92            int registryPort = TestLibrary.getRegistryPort(localRegistry);
93            System.err.println("created local registry");
94
95            localRegistry.bind(BINDING, obj);
96            System.err.println("bound remote object in local registry");
97
98            synchronized (obj.lock) {
99                System.err.println("starting remote client VM...");
100                jvm = new JavaVM("SelfTerminator", "-Drmi.registry.port=" +
101                            registryPort, "");
102                jvm.start();
103
104                System.err.println("waiting for unreferenced() callback...");
105                obj.lock.wait(TIMEOUT);
106
107                if (obj.unreferencedInvoked) {
108                    System.err.println("TEST PASSED: " +
109                        "unreferenced() invoked in timely fashion");
110                } else {
111                    throw new RuntimeException(
112                        "TEST FAILED: unreferenced() not invoked after " +
113                        ((double) TIMEOUT / 1000.0) + " seconds");
114                }
115            }
116
117        } catch (Exception e) {
118            if (e instanceof RuntimeException) {
119                throw (RuntimeException) e;
120            } else {
121                throw new RuntimeException(
122                    "TEST FAILED: unexpected exception: " + e.toString());
123            }
124        } finally {
125            if (jvm != null) {
126                jvm.destroy();
127            }
128            /*
129             * When all is said and done, try to unexport the remote object
130             * so that the VM has a chance to exit.
131             */
132            try {
133                UnicastRemoteObject.unexportObject(obj, true);
134            } catch (RemoteException e) {
135            }
136        }
137    }
138}
139