1 /*
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   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /* @test
  25  * @bug 4285878
  26  * @summary When the "java.rmi.dgc.leaseValue" system property is set to a
  27  * value much lower than its default (10 minutes), then the server-side
  28  * user-visible detection of DGC lease expiration-- in the form of
  29  * Unreferenced.unreferenced() invocations and possibly even local garbage
  30  * collection (including weak reference notification, finalization, etc.)--
  31  * may be delayed longer than expected.  While this is not a spec violation
  32  * (because there are no timeliness guarantees for any of these garbage
  33  * collection-related events), the user might expect that an unreferenced()
  34  * invocation for an object whose last client has terminated abnorally
  35  * should occur on relatively the same time order as the lease value
  36  * granted.
  37  * @author Peter Jones
  38  *
  39  * @library ../../../testlibrary
  40  * @modules java.rmi/sun.rmi.registry
  41  *          java.rmi/sun.rmi.server
  42  *          java.rmi/sun.rmi.transport
  43  *          java.rmi/sun.rmi.transport.tcp
  44  * @build TestLibrary JavaVM LeaseCheckInterval_Stub SelfTerminator
  45  * @run main/othervm LeaseCheckInterval
  46  */
  47 
  48 import java.rmi.Remote;
  49 import java.rmi.RemoteException;
  50 import java.rmi.registry.LocateRegistry;
  51 import java.rmi.registry.Registry;
  52 import java.rmi.server.UnicastRemoteObject;
  53 import java.rmi.server.Unreferenced;
  54 
  55 public class LeaseCheckInterval implements Remote, Unreferenced {
  56 
  57     public static final String BINDING = "LeaseCheckInterval";
  58     private static final long LEASE_VALUE = 10000;
  59     private static final long TIMEOUT = 20000;
  60 
  61     private Object lock = new Object();
  62     private boolean unreferencedInvoked = false;
  63 
  64     public void unreferenced() {
  65         System.err.println("unreferenced() method invoked");
  66         synchronized (lock) {
  67             unreferencedInvoked = true;
  68             lock.notify();
  69         }
  70     }
  71 
  72     public static void main(String[] args) throws Exception {
  73 
  74         System.err.println("\nRegression test for bug 4285878\n");
  75 
  76         /*
  77          * Set the duration of leases granted to a very small value, so that
  78          * we can test if expirations are detected in a roughly comparable
  79          * time.
  80          */
  81         System.setProperty("java.rmi.dgc.leaseValue",
  82                            String.valueOf(LEASE_VALUE));
  83 
  84         LeaseCheckInterval obj = new LeaseCheckInterval();
  85 
  86         try {
  87             UnicastRemoteObject.exportObject(obj);
  88             System.err.println("exported remote object");
  89 
  90             int registryPort = TestLibrary.getUnusedRandomPort();
  91             Registry localRegistry =
  92                 LocateRegistry.createRegistry(registryPort);
  93             System.err.println("created local registry");
  94 
  95             localRegistry.bind(BINDING, obj);
  96             System.err.println("bound remote object in local registry");
  97 
  98             synchronized (obj.lock) {
  99                 System.err.println("starting remote client VM...");
 100                 (new JavaVM("SelfTerminator", "-Drmi.registry.port=" +
 101                             registryPort, "")).start();
 102 
 103                 System.err.println("waiting for unreferenced() callback...");
 104                 obj.lock.wait(TIMEOUT);
 105 
 106                 if (obj.unreferencedInvoked) {
 107                     System.err.println("TEST PASSED: " +
 108                         "unreferenced() invoked in timely fashion");
 109                 } else {
 110                     throw new RuntimeException(
 111                         "TEST FAILED: unreferenced() not invoked after " +
 112                         ((double) TIMEOUT / 1000.0) + " seconds");
 113                 }
 114             }
 115 
 116         } catch (Exception e) {
 117             if (e instanceof RuntimeException) {
 118                 throw (RuntimeException) e;
 119             } else {
 120                 throw new RuntimeException(
 121                     "TEST FAILED: unexpected exception: " + e.toString());
 122             }
 123         } finally {
 124             /*
 125              * When all is said and done, try to unexport the remote object
 126              * so that the VM has a chance to exit.
 127              */
 128             try {
 129                 UnicastRemoteObject.unexportObject(obj, true);
 130             } catch (RemoteException e) {
 131             }
 132         }
 133     }
 134 }