| /* |
| * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @bug 4017232 |
| * @summary If, after returning a reference to a remote object in the current |
| * VM (which gets implicitly converted to a remote stub), the client fails to |
| * both send a DGC dirty call and to send a "DGC acknowledgment", the RMI |
| * runtime should eventually allow the remote object to be garbage collected, |
| * rather than pinning it indefinitely. |
| * @author Peter Jones |
| * |
| * @build DGCAckFailure |
| * @build DGCAckFailure_Stub |
| * @run main/othervm DGCAckFailure |
| */ |
| |
| import java.io.*; |
| import java.net.*; |
| import java.lang.ref.*; |
| |
| import java.rmi.*; |
| import java.rmi.server.*; |
| |
| interface ReturnRemote extends Remote { |
| Object returnRemote() throws RemoteException; |
| } |
| |
| public class DGCAckFailure implements ReturnRemote { |
| |
| private static final long TIMEOUT = 20000; |
| |
| public Object returnRemote() { |
| return new Wrapper(this); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| |
| System.setProperty("sun.rmi.dgc.ackTimeout", "10000"); |
| |
| /* |
| * Set a socket factory that has a hook for shutting down all client |
| * output (writes from client-created sockets and new connection |
| * attempts). We then use this hook right before a remote stub gets |
| * deserialized, so that the client will not be able to send a DGC |
| * dirty call, or a DGC acknowledgment. Without the DGC ack, we |
| * hope that the RMI runtime will still eventually allow the remote |
| * object to be garbage collected. |
| */ |
| RMISocketFactory.setSocketFactory(new TestSF()); |
| System.err.println("test socket factory set"); |
| |
| Remote impl = new DGCAckFailure(); |
| ReferenceQueue refQueue = new ReferenceQueue(); |
| Reference weakRef = new WeakReference(impl, refQueue); |
| ReturnRemote stub = |
| (ReturnRemote) UnicastRemoteObject.exportObject(impl); |
| System.err.println("remote object exported; stub = " + stub); |
| |
| try { |
| Object wrappedStub = stub.returnRemote(); |
| System.err.println("invocation returned: " + wrappedStub); |
| |
| impl = null; |
| stub = null; // in case 4114579 ever gets fixed |
| System.err.println("strong references to impl cleared"); |
| |
| System.err.println("waiting for weak reference notification:"); |
| Reference ref = null; |
| for (int i = 0; i < 6; i++) { |
| System.gc(); |
| ref = refQueue.remove(TIMEOUT / 5); |
| if (ref != null) { |
| break; |
| } |
| } |
| if (ref == weakRef) { |
| System.err.println("TEST PASSED"); |
| } else { |
| throw new RuntimeException("TEST FAILED: " + |
| "timed out, remote object not garbage collected"); |
| } |
| } finally { |
| try { |
| UnicastRemoteObject.unexportObject((Remote) weakRef.get(), |
| true); |
| } catch (Exception e) { |
| } |
| } |
| } |
| |
| private static class Wrapper implements Serializable { |
| private final Remote obj; |
| Wrapper(Remote obj) { this.obj = obj; } |
| |
| private void readObject(ObjectInputStream in) |
| throws IOException, ClassNotFoundException |
| { |
| TestSF.shutdownClientOutput(); |
| System.err.println( |
| "Wrapper.readObject: SHUTTING DOWN CLIENT OUTPUT"); |
| in.defaultReadObject(); |
| } |
| |
| public String toString() { return "Wrapper[" + obj + "]"; } |
| } |
| |
| private static class TestSF extends RMISocketFactory { |
| |
| private static volatile boolean shutdown = false; |
| static void shutdownClientOutput() { shutdown = true; } |
| |
| public Socket createSocket(String host, int port) throws IOException { |
| if (shutdown) { |
| IOException e = new java.net.ConnectException( |
| "test socket factory rejecting client connection"); |
| System.err.println(e); |
| // e.printStackTrace(); |
| throw e; |
| } else { |
| return new TestSocket(host, port); |
| } |
| } |
| |
| public ServerSocket createServerSocket(int port) throws IOException { |
| return new ServerSocket(port); |
| } |
| |
| private static class TestSocket extends Socket { |
| TestSocket(String host, int port) throws IOException { |
| super(host, port); |
| } |
| public OutputStream getOutputStream() throws IOException { |
| return new TestOutputStream(super.getOutputStream()); |
| } |
| } |
| |
| private static class TestOutputStream extends FilterOutputStream { |
| TestOutputStream(OutputStream out) { super(out); } |
| public void write(int b) throws IOException { |
| if (shutdown) { |
| IOException e = new IOException( |
| "connection broken by test socket factory"); |
| System.err.println(e); |
| // e.printStackTrace(); |
| throw e; |
| } else { |
| super.write(b); |
| } |
| } |
| } |
| } |
| } |