| /* |
| * Copyright (c) 1999, 2012, 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 4268258 |
| * @summary When a DGC dirty call fails, RMI's client-side DGC implementation |
| * should attempt to retry the same dirty call a few times, at least until the |
| * known lease for that endpoint has expired, instead of just giving up |
| * renewing that lease at all after the first failure. |
| * @author Peter Jones (inspired by Adrian Colley's test case in 4268258) |
| * |
| * @build RetryDirtyCalls RetryDirtyCalls_Stub |
| * @run main/othervm RetryDirtyCalls |
| */ |
| |
| import java.io.*; |
| import java.net.*; |
| import java.rmi.*; |
| import java.rmi.server.*; |
| |
| interface Self extends Remote { |
| Self getSelf() throws RemoteException; |
| } |
| |
| public class RetryDirtyCalls implements Self, Unreferenced { |
| |
| /** how long we wait before declaring that this test has passed */ |
| private final static long TIMEOUT = 20000; |
| |
| /** true if this object's unreferenced method has been called */ |
| private boolean unreferenced = false; |
| |
| /** |
| * Return this object. The need for this method is explained below. |
| */ |
| public Self getSelf() { |
| return this; |
| } |
| |
| public void unreferenced() { |
| synchronized (this) { |
| unreferenced = true; |
| notifyAll(); |
| } |
| } |
| |
| public static void main(String[] args) { |
| |
| System.err.println("\nRegression test for bug 4268258\n"); |
| |
| /* |
| * Set properties to tweak DGC behavior so that this test will execute |
| * quickly: set the granted lease duration to 10 seconds, the interval |
| * that leases are checked to 3 seconds. |
| */ |
| System.setProperty("java.rmi.dgc.leaseValue", "10000"); |
| System.setProperty("sun.rmi.dgc.checkInterval", "3000"); |
| |
| /* |
| * Make idle connections time out almost instantly (0.1 seconds) so |
| * that the DGC implementation will have to make a new connection for |
| * each dirty call, thus going through the socket factory, where we |
| * can easily cause the operation to fail. |
| */ |
| System.setProperty("sun.rmi.transport.connectionTimeout", "100"); |
| |
| RetryDirtyCalls impl = new RetryDirtyCalls(); |
| |
| try { |
| TestSF sf = new TestSF(); |
| RMISocketFactory.setSocketFactory(sf); |
| |
| /* |
| * The stub returned by UnicastRemoteObject.exportObject() does |
| * not participate in DGC, but it does allow us to invoke a method |
| * on the remote object through RMI. Therefore, we invoke the |
| * getSelf() method through RMI, which returns an equivalent stub |
| * that does participate in DGC. |
| */ |
| Self stub = (Self) UnicastRemoteObject.exportObject(impl); |
| Self dgcStub = stub.getSelf(); |
| stub = null; // in case 4114579 has been fixed |
| |
| /* |
| * Set the socket factory to cause 3 connections attempts in a row |
| * to fail before allowing a connection to succeed, expecting the |
| * client-side DGC implementation to make at least four attempts. |
| */ |
| final int FLAKE_FACTOR = 3; |
| sf.setFlakeFactor(FLAKE_FACTOR); |
| |
| long deadline = System.currentTimeMillis() + TIMEOUT; |
| boolean unreferenced; |
| |
| synchronized (impl) { |
| while (!(unreferenced = impl.unreferenced)) { |
| long timeToWait = deadline - System.currentTimeMillis(); |
| if (timeToWait > 0) { |
| impl.wait(timeToWait); |
| } else { |
| break; |
| } |
| } |
| } |
| |
| if (unreferenced) { |
| throw new RuntimeException("remote object unreferenced"); |
| } |
| |
| int createCount = sf.getCreateCount(); |
| if (createCount == 0) { |
| throw new RuntimeException("test socket factory never used"); |
| } else if (createCount < (FLAKE_FACTOR + 3)) { |
| /* |
| * The unreferenced method was not invoked for some reason, |
| * but the dirty calls were clearly not retried well enough. |
| */ |
| throw new RuntimeException( |
| "test failed because dirty calls not retried enough, " + |
| "but remote object not unreferenced"); |
| } |
| |
| System.err.println( |
| "TEST PASSED: remote object not unreferenced"); |
| |
| } catch (Exception e) { |
| e.printStackTrace(); |
| throw new RuntimeException("TEST FAILED: " + 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(impl, true); |
| } catch (Exception e) { |
| } |
| } |
| } |
| } |
| |
| class TestSF extends RMISocketFactory { |
| |
| private int flakeFactor = 0; |
| |
| private int flakeState = 0; |
| |
| private int createCount = 0; |
| |
| public synchronized void setFlakeFactor(int newFlakeFactor) { |
| flakeFactor = newFlakeFactor; |
| } |
| |
| public synchronized int getCreateCount() { |
| return createCount; |
| } |
| |
| public synchronized Socket createSocket(String host, int port) |
| throws IOException |
| { |
| createCount++; |
| |
| if (++flakeState > flakeFactor) { |
| flakeState = 0; |
| } |
| |
| if (flakeState == 0) { |
| return new Socket(host, port); |
| } else { |
| throw new IOException("random network failure"); |
| } |
| } |
| |
| public ServerSocket createServerSocket(int port) throws IOException { |
| return new ServerSocket(port); |
| } |
| } |