1 /*
2 * Copyright (c) 2001, 2012, 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 * @build TestLibrary JavaVM LeaseCheckInterval_Stub SelfTerminator
41 * @run main/othervm LeaseCheckInterval
42 */
43
44 import java.rmi.Remote;
45 import java.rmi.RemoteException;
46 import java.rmi.registry.LocateRegistry;
47 import java.rmi.registry.Registry;
48 import java.rmi.server.UnicastRemoteObject;
49 import java.rmi.server.Unreferenced;
50
51 public class LeaseCheckInterval implements Remote, Unreferenced {
52
53 public static final String BINDING = "LeaseCheckInterval";
54 private static final long LEASE_VALUE = 10000;
55 private static final long TIMEOUT = 20000;
56
57 private Object lock = new Object();
58 private boolean unreferencedInvoked = false;
59
60 public void unreferenced() {
61 System.err.println("unreferenced() method invoked");
62 synchronized (lock) {
63 unreferencedInvoked = true;
64 lock.notify();
65 }
66 }
67
68 public static void main(String[] args) throws Exception {
69
70 System.err.println("\nRegression test for bug 4285878\n");
71
72 /*
73 * Set the duration of leases granted to a very small value, so that
74 * we can test if expirations are detected in a roughly comparable
75 * time.
76 */
77 System.setProperty("java.rmi.dgc.leaseValue",
78 String.valueOf(LEASE_VALUE));
79
80 LeaseCheckInterval obj = new LeaseCheckInterval();
81
82 try {
83 UnicastRemoteObject.exportObject(obj);
84 System.err.println("exported remote object");
85
86 int registryPort = TestLibrary.getUnusedRandomPort();
87 Registry localRegistry =
88 LocateRegistry.createRegistry(registryPort);
89 System.err.println("created local registry");
90
91 localRegistry.bind(BINDING, obj);
92 System.err.println("bound remote object in local registry");
93
94 synchronized (obj.lock) {
95 System.err.println("starting remote client VM...");
96 (new JavaVM("SelfTerminator", "-Drmi.registry.port=" +
97 registryPort, "")).start();
98
99 System.err.println("waiting for unreferenced() callback...");
100 obj.lock.wait(TIMEOUT);
101
102 if (obj.unreferencedInvoked) {
103 System.err.println("TEST PASSED: " +
104 "unreferenced() invoked in timely fashion");
105 } else {
106 throw new RuntimeException(
107 "TEST FAILED: unreferenced() not invoked after " +
108 ((double) TIMEOUT / 1000.0) + " seconds");
109 }
110 }
111
112 } catch (Exception e) {
113 if (e instanceof RuntimeException) {
114 throw (RuntimeException) e;
115 } else {
116 throw new RuntimeException(
117 "TEST FAILED: unexpected exception: " + e.toString());
118 }
119 } finally {
120 /*
121 * When all is said and done, try to unexport the remote object
122 * so that the VM has a chance to exit.
123 */
124 try {
125 UnicastRemoteObject.unexportObject(obj, true);
126 } catch (RemoteException e) {
127 }
128 }
129 }
130 }