| /* |
| * Copyright (c) 1998, 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 4164696 |
| * @summary The local garbage collector needs to inspect a client VM's heap |
| * often enough (even if the VM is idle) to detect unreachable live remote |
| * references, so that their server VMs can be informed that the client VM |
| * is no longer holding a reference; this facilitates the server VM invoking |
| * the remote object's unreferenced() method (if present), garbage collecting |
| * the remote object, and allowing the server VM to exit. This test focuses |
| * on the unreferenced() method being invoked: it tests that the callback |
| * method will be invoked within a reasonable time after the remote object is |
| * no longer remotely reachable. |
| * @author Peter Jones |
| * |
| * @library ../../../testlibrary |
| * @build FiniteGCLatency |
| * @build FiniteGCLatency_Stub |
| * @run main/othervm/timeout=120 FiniteGCLatency |
| */ |
| |
| import java.rmi.*; |
| import java.rmi.registry.*; |
| import java.rmi.server.*; |
| |
| public class FiniteGCLatency implements Remote, Unreferenced { |
| |
| private final static String BINDING = "FiniteGCLatency"; |
| private final static long GC_INTERVAL = 6000; |
| private final static long TIMEOUT = 50000; |
| |
| private Object lock = new Object(); |
| private boolean unreferencedInvoked = false; |
| |
| public void unreferenced() { |
| System.err.println("unreferenced() method invoked"); |
| synchronized (lock) { |
| unreferencedInvoked = true; |
| lock.notify(); |
| } |
| } |
| |
| public static void main(String[] args) { |
| |
| System.err.println("\nRegression test for bug 4164696\n"); |
| |
| /* |
| * Set the interval that RMI will request for GC latency (before RMI |
| * gets initialized and this property is read) to an unrealistically |
| * small value, so that this test shouldn't have to wait too long. |
| */ |
| System.setProperty("sun.rmi.dgc.client.gcInterval", |
| String.valueOf(GC_INTERVAL)); |
| |
| FiniteGCLatency obj = new FiniteGCLatency(); |
| |
| try { |
| UnicastRemoteObject.exportObject(obj); |
| System.err.println("exported remote object"); |
| |
| LocateRegistry.createRegistry(TestLibrary.REGISTRY_PORT); |
| System.err.println("created registry"); |
| |
| Registry registry = LocateRegistry.getRegistry("", TestLibrary.REGISTRY_PORT); |
| registry.bind(BINDING, obj); |
| System.err.println("bound remote object in registry"); |
| |
| synchronized (obj.lock) { |
| registry.unbind(BINDING); |
| System.err.println("unbound remote object from registry; " + |
| "waiting for unreferenced() callback..."); |
| obj.lock.wait(TIMEOUT); |
| |
| if (obj.unreferencedInvoked) { |
| System.err.println("TEST PASSED: unreferenced() invoked"); |
| } else { |
| throw new RuntimeException( |
| "TEST FAILED: unrefereced() not invoked after " + |
| ((double) TIMEOUT / 1000.0) + " seconds"); |
| } |
| } |
| |
| } catch (Exception e) { |
| if (e instanceof RuntimeException) { |
| throw (RuntimeException) e; |
| } else { |
| throw new RuntimeException( |
| "TEST FAILED: unexpected exception: " + e.toString()); |
| } |
| } finally { |
| /* |
| * When all is said and done, try to unexport the remote object |
| * so that the VM has a chance to exit. |
| */ |
| try { |
| UnicastRemoteObject.unexportObject(obj, true); |
| } catch (RemoteException e) { |
| } |
| } |
| } |
| } |