1 /*
2 * Copyright (c) 2001, 2016, 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 * @key intermittent
47 */
48
49 import java.rmi.Remote;
50 import java.rmi.RemoteException;
51 import java.rmi.registry.LocateRegistry;
52 import java.rmi.registry.Registry;
53 import java.rmi.server.UnicastRemoteObject;
54 import java.rmi.server.Unreferenced;
55
56 public class LeaseCheckInterval implements Remote, Unreferenced {
57
58 public static final String BINDING = "LeaseCheckInterval";
59 private static final long LEASE_VALUE = 10000;
60 private static final long TIMEOUT = 20000;
61
62 private Object lock = new Object();
63 private boolean unreferencedInvoked = false;
64
65 public void unreferenced() {
66 System.err.println("unreferenced() method invoked");
67 synchronized (lock) {
68 unreferencedInvoked = true;
69 lock.notify();
70 }
71 }
72
73 public static void main(String[] args) throws Exception {
74
75 System.err.println("\nRegression test for bug 4285878\n");
76
77 /*
78 * Set the duration of leases granted to a very small value, so that
79 * we can test if expirations are detected in a roughly comparable
80 * time.
81 */
82 System.setProperty("java.rmi.dgc.leaseValue",
83 String.valueOf(LEASE_VALUE));
84
85 LeaseCheckInterval obj = new LeaseCheckInterval();
86
87 try {
88 UnicastRemoteObject.exportObject(obj);
89 System.err.println("exported remote object");
90
91 int registryPort = TestLibrary.getUnusedRandomPort();
92 Registry localRegistry =
93 LocateRegistry.createRegistry(registryPort);
94 System.err.println("created local registry");
95
96 localRegistry.bind(BINDING, obj);
97 System.err.println("bound remote object in local registry");
98
99 synchronized (obj.lock) {
100 System.err.println("starting remote client VM...");
101 (new JavaVM("SelfTerminator", "-Drmi.registry.port=" +
102 registryPort, "")).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 /*
126 * When all is said and done, try to unexport the remote object
127 * so that the VM has a chance to exit.
128 */
129 try {
130 UnicastRemoteObject.unexportObject(obj, true);
131 } catch (RemoteException e) {
132 }
133 }
134 }
135 }