| /* |
| * Copyright (c) 1998, 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 4099660 4102938 |
| * @summary Remote classes not extending RemoteObject should be able to |
| * implement hashCode() and equals() methods so that instances |
| * can be successfully compared to RemoteObject instances |
| * (specifically: stubs) that contain the instance's RemoteRef. |
| * @author Peter Jones |
| * |
| * @build NotExtending |
| * @build NotExtending_Stub |
| * @build NotExtending_Skel |
| * @run main/othervm/timeout=240 NotExtending |
| */ |
| |
| |
| import java.rmi.*; |
| import java.rmi.server.*; |
| |
| public class NotExtending implements Remote { |
| |
| /** remote stub for this server instance */ |
| private Remote stub; |
| /** value of stub's hash code */ |
| private int hashValue; |
| /** true if the hashValue field has been initialized */ |
| private boolean hashValueInitialized = false; |
| |
| public NotExtending() throws RemoteException { |
| stub = UnicastRemoteObject.exportObject(this); |
| setHashValue(stub.hashCode()); |
| } |
| |
| private void setHashValue(int value) { |
| hashValue = value; |
| hashValueInitialized = true; |
| } |
| |
| public int hashCode() { |
| /* |
| * Test fails with a RuntimeException if the hashCode() method is |
| * called (during the export procedure) before the correct hash |
| * value has been initialized. |
| */ |
| if (!hashValueInitialized) { |
| throw new RuntimeException( |
| "hashCode() invoked before hashValue initialized"); |
| } |
| return hashValue; |
| } |
| |
| public boolean equals(Object obj) { |
| return stub.equals(obj); |
| } |
| |
| public static void main(String[] args) throws Exception { |
| /* |
| * The following line is required with the JDK 1.2 VM so that the |
| * VM can exit gracefully when this test completes. Otherwise, the |
| * conservative garbage collector will find a handle to the server |
| * object on the native stack and not clear the weak reference to |
| * it in the RMI runtime's object table. |
| */ |
| Object dummy = new Object(); |
| |
| NotExtending server; |
| try { |
| /* |
| * Verify that hashCode() is not invoked before it is |
| * initialized. Tests bugid 4102938. |
| */ |
| server = new NotExtending(); |
| System.err.println("Server exported without invoking hashCode()."); |
| |
| /* |
| * Verify that passing stub to server's equals() method |
| * returns true. |
| */ |
| if (server.equals(server.stub)) { |
| System.err.println( |
| "Passing stub to server's equals() method succeeded."); |
| } else { |
| throw new RuntimeException( |
| "passing stub to server's equals() method failed"); |
| } |
| |
| /* |
| * Verify that passing server to stub's equals() method |
| * returns true. Tests bugid 4099660. |
| */ |
| if (server.stub.equals(server)) { |
| System.err.println( |
| "Passing server to stub's equals() method succeeded."); |
| } else { |
| throw new RuntimeException( |
| "passing server to stub's equals() method failed"); |
| } |
| |
| } finally { |
| server = null; |
| flushCachedRefs(); |
| } |
| } |
| |
| /** |
| * Force desparate garbage collection so that all sun.misc.Ref instances |
| * will be cleared. |
| * |
| * This method is required with the JDK 1.1.x RMI runtime so that the |
| * VM can exit gracefully when this test completes. See bugid 4006356. |
| */ |
| public static void flushCachedRefs() { |
| java.util.Vector chain = new java.util.Vector(); |
| try { |
| while (true) { |
| int[] hungry = new int[65536]; |
| chain.addElement(hungry); |
| } |
| } catch (OutOfMemoryError e) { |
| } |
| } |
| } |