1 /* 2 * Copyright (c) 2005, 2008, 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 4486732 26 * @summary When a remote stub contains a client socket factory and a 27 * remote invocation is made using that stub, the factory should not 28 * be held strongly reachable by the RMI implementation forever; in 29 * particular, after the stub has become unreachable and all 30 * connections to its endpoint have been closed, then the factory 31 * should become unreachable too (through the RMI implementation). 32 * @author Peter Jones 33 * 34 * @run main/othervm -Dsun.rmi.transport.connectionTimeout=2000 35 * PinClientSocketFactory 36 */ 37 38 import java.io.IOException; 39 import java.io.ObjectInputStream; 40 import java.io.Serializable; 41 import java.lang.ref.Reference; 42 import java.lang.ref.WeakReference; 43 import java.net.ServerSocket; 44 import java.net.Socket; 45 import java.rmi.Remote; 46 import java.rmi.RemoteException; 47 import java.rmi.registry.LocateRegistry; 48 import java.rmi.registry.Registry; 49 import java.rmi.server.RMIClientSocketFactory; 50 import java.rmi.server.RMIServerSocketFactory; 51 import java.rmi.server.UnicastRemoteObject; 52 import java.util.ArrayList; 53 import java.util.Collections; 54 import java.util.List; 55 import java.util.concurrent.atomic.AtomicInteger; 56 57 public class PinClientSocketFactory { 58 59 private static final int PORT = 2345; 60 private static final int SESSIONS = 50; 61 62 public interface Factory extends Remote { 63 Session getSession() throws RemoteException; 64 } 65 66 public interface Session extends Remote { 67 void ping() throws RemoteException; 68 } 69 70 private static class FactoryImpl implements Factory { 71 FactoryImpl() { } 72 public Session getSession() throws RemoteException { 73 Session impl = new SessionImpl(); 74 UnicastRemoteObject.exportObject(impl, 0, new CSF(), new SSF()); 75 // return impl instead of stub to work around 4114579 76 return impl; 77 } 78 } 79 80 private static class SessionImpl implements Session { 81 SessionImpl() { } 82 public void ping() { } 83 } 84 85 public static void main(String[] args) throws Exception { 86 System.err.println("\nRegression test for bug 4486732\n"); 87 88 Factory factoryImpl = new FactoryImpl(); 89 Factory factoryStub = 90 (Factory) UnicastRemoteObject.exportObject(factoryImpl, 0); 91 for (int i = 0; i < SESSIONS; i++) { 92 Session session = factoryStub.getSession(); 93 session.ping(); 94 } 95 UnicastRemoteObject.unexportObject(factoryImpl, true); 96 97 Registry registryImpl = LocateRegistry.createRegistry(PORT); 98 CSF csf = new CSF(); 99 Reference<CSF> registryRef = new WeakReference<CSF>(csf); 100 Registry registryStub = LocateRegistry.getRegistry("", PORT, csf); 101 csf = null; 102 registryStub.list(); 103 registryStub = null; 104 UnicastRemoteObject.unexportObject(registryImpl, true); 105 106 System.gc(); 107 // allow connections to time out 108 Thread.sleep(3 * Long.getLong("sun.rmi.transport.connectionTimeout", 109 15000)); 110 System.gc(); 111 112 if (CSF.deserializedInstances.size() != SESSIONS) { 113 throw new Error("unexpected number of deserialized instances: " + 114 CSF.deserializedInstances.size()); 115 } 116 117 int nonNullCount = 0; 118 for (Reference<CSF> ref : CSF.deserializedInstances) { 119 csf = ref.get(); 120 if (csf != null) { 121 System.err.println("non-null deserialized instance: " + csf); 122 nonNullCount++; 123 } 124 } 125 if (nonNullCount > 0) { 126 throw new Error("TEST FAILED: " + 127 nonNullCount + " non-null deserialized instances"); 128 } 129 130 csf = registryRef.get(); 131 if (csf != null) { 132 System.err.println("non-null registry instance: " + csf); 133 throw new Error("TEST FAILED: non-null registry instance"); 134 } 135 136 System.err.println("TEST PASSED"); 137 } 138 139 private static class CSF implements RMIClientSocketFactory, Serializable { 140 static final List<Reference<CSF>> deserializedInstances = 141 Collections.synchronizedList(new ArrayList<Reference<CSF>>()); 142 private static final AtomicInteger count = new AtomicInteger(0); 143 private int num = count.incrementAndGet(); 144 CSF() { } 145 public Socket createSocket(String host, int port) throws IOException { 146 return new Socket(host, port); 147 } 148 public int hashCode() { 149 return num; 150 } 151 public boolean equals(Object obj) { 152 return obj instanceof CSF && ((CSF) obj).num == num; 153 } 154 private void readObject(ObjectInputStream in) 155 throws IOException, ClassNotFoundException 156 { 157 in.defaultReadObject(); 158 deserializedInstances.add(new WeakReference<CSF>(this)); 159 } 160 } 161 162 private static class SSF implements RMIServerSocketFactory { 163 SSF() { } 164 public ServerSocket createServerSocket(int port) throws IOException { 165 return new ServerSocket(port); 166 } 167 } 168 }