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 * @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 48 import java.rmi.Remote; 49 import java.rmi.RemoteException; 50 import java.rmi.registry.LocateRegistry; 51 import java.rmi.registry.Registry; 52 import java.rmi.server.UnicastRemoteObject; 53 import java.rmi.server.Unreferenced; 54 55 public 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 86 try { 87 UnicastRemoteObject.exportObject(obj); 88 System.err.println("exported remote object"); 89 90 int registryPort = TestLibrary.getUnusedRandomPort(); 91 Registry localRegistry = 92 LocateRegistry.createRegistry(registryPort); 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 (new JavaVM("SelfTerminator", "-Drmi.registry.port=" + 101 registryPort, "")).start(); 102 103 System.err.println("waiting for unreferenced() callback..."); 104 obj.lock.wait(TIMEOUT); 105 106 if (obj.unreferencedInvoked) { 107 System.err.println("TEST PASSED: " + 108 "unreferenced() invoked in timely fashion"); 109 } else { 110 throw new RuntimeException( 111 "TEST FAILED: unreferenced() not invoked after " + 112 ((double) TIMEOUT / 1000.0) + " seconds"); 113 } 114 } 115 116 } catch (Exception e) { 117 if (e instanceof RuntimeException) { 118 throw (RuntimeException) e; 119 } else { 120 throw new RuntimeException( 121 "TEST FAILED: unexpected exception: " + e.toString()); 122 } 123 } finally { 124 /* 125 * When all is said and done, try to unexport the remote object 126 * so that the VM has a chance to exit. 127 */ 128 try { 129 UnicastRemoteObject.unexportObject(obj, true); 130 } catch (RemoteException e) { 131 } 132 } 133 } 134 }