--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/rmi/dgc/dgcAckFailure/DGCAckFailure.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,173 @@
+/* 
+ * Copyright 2001 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.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);
+		}
+	    }
+	}
+    }
+}