1 /*

     2  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    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 import java.util.logging.*;

    25 

    26 public class LoggerWeakRefLeak extends SimpleApplication {

    27     // The test driver script will allow this program to run until we

    28     // reach DEFAULT_LOOP_TIME or a decrease in instance counts is

    29     // observed. For these particular WeakReference leaks, the count

    30     // was always observed to be increasing so if we get a decreasing

    31     // count, then the leaks are fixed in the bits being tested.

    32     // Two minutes has been enough time to observe a decrease in

    33     // fixed bits on overloaded systems, but the test will likely

    34     // finish more quickly.

    35     public static int DEFAULT_LOOP_TIME = 120;  // time is in seconds

    36 

    37     // execute the LoggerWeakRefLeak app work

    38     public void doMyAppWork(String[] args) throws Exception {

    39         int loop_time = 0;

    40         int max_loop_time = DEFAULT_LOOP_TIME;

    41 

    42         // args[0] is the port-file

    43         if (args.length < 2) {

    44             System.out.println("INFO: using default time of "

    45                 + max_loop_time + " seconds.");

    46         } else {

    47             try {

    48                 max_loop_time = Integer.parseInt(args[1]);

    49             } catch (NumberFormatException nfe) {

    50                 throw new RuntimeException("Error: '" + args[1]

    51                     + "': is not a valid seconds value.");

    52             }

    53         }

    54 

    55         long count = 0;

    56         int  loggerCount = 0;

    57         long now = 0;

    58         long startTime = System.currentTimeMillis();

    59 

    60         while (now < (startTime + (max_loop_time * 1000))) {

    61             if ((count % 1000) == 0) {

    62                 // Print initial call count to let caller know that

    63                 // we're up and running and then periodically

    64                 System.out.println("INFO: call count = " + count);

    65             }

    66 

    67             for (int i = 0; i < 100; i++) {

    68                 // This Logger call is leaking two different WeakReferences:

    69                 // - one in LogManager.LogNode

    70                 // - one in Logger.kids

    71                 java.util.logging.Logger.getLogger("logger-" + loggerCount);

    72                 count++;

    73                 if (++loggerCount >= 25000) {

    74                     // Limit the Logger namespace used by the test so

    75                     // the weak refs in LogManager.loggers that are

    76                     // being properly managed don't skew the counts

    77                     // by too much.

    78                     loggerCount = 0;

    79                 }

    80             }

    81 

    82             try {

    83                 // delay for 1/10 of a second to avoid CPU saturation

    84                 Thread.sleep(100);

    85             } catch (InterruptedException ie) {

    86                 // ignore any exceptions

    87             }

    88 

    89             now = System.currentTimeMillis();

    90         }

    91 

    92         System.out.println("INFO: final loop count = " + count);

    93     }

    94 

    95     public static void main(String[] args) throws Exception {

    96         AnonLoggerWeakRefLeak myApp = new AnonLoggerWeakRefLeak();

    97 

    98         SimpleApplication.setMyApp(myApp);

    99 

   100         SimpleApplication.main(args);

   101     }

   102 }