1 /*

     2  * Copyright 2003-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug     4858522

    27  * @summary Basic unit test of OperatingSystemMXBean.getFreeSwapSpaceSize()

    28  * @author  Steve Bohne

    29  */

    30 

    31 /*

    32  * This test is just a sanity check and does not check for the correct

    33  * value.  The correct value should be checked manually:

    34  * Solaris:

    35  *   1. In a shell, enter the command: "swap -l"

    36  *   2. The value (reported in blocks) is in the "free" column.

    37  * Linux:

    38  *   1. In a shell, enter the command: "cat /proc/meminfo"

    39  *   2. The value (reported in bytes) is in "Swap" entry, "free" column.

    40  * Windows NT/XP/2000:

    41  *   Unknown.

    42  * Windows 98/ME:

    43  *   Unknown.

    44  */

    45 

    46 import com.sun.management.OperatingSystemMXBean;

    47 import java.lang.management.*;

    48 

    49 public class GetFreeSwapSpaceSize {

    50 

    51     private static OperatingSystemMXBean mbean =

    52         (com.sun.management.OperatingSystemMXBean)

    53         ManagementFactory.getOperatingSystemMXBean();

    54 

    55     // Careful with these values.

    56     // Min size is zero since the system can run of swap spaces

    57     private static final long MIN_SIZE_FOR_PASS = 0;

    58     // Max size for pass dynamically determined below.

    59     private static long       max_size_for_pass = Long.MAX_VALUE;

    60 

    61     private static boolean trace = false;

    62 

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

    64         if (args.length > 0 && args[0].equals("trace")) {

    65             trace = true;

    66         }

    67 

    68         long max_size = mbean.getTotalSwapSpaceSize();

    69         if (max_size > 0) {

    70             max_size_for_pass = max_size;

    71         }

    72 

    73         long size = mbean.getFreeSwapSpaceSize();

    74 

    75         if (trace) {

    76             System.out.println("Free swap space size in bytes: " + size);

    77         }

    78 

    79         if (size < MIN_SIZE_FOR_PASS || size > max_size_for_pass) {

    80             throw new RuntimeException("Free swap space size " +

    81                                        "illegal value: " + size + " bytes " +

    82                                        "(MIN = " + MIN_SIZE_FOR_PASS + "; " +

    83                                        "MAX = " + max_size_for_pass + ")");

    84         }

    85 

    86         System.out.println("Test passed.");

    87     }

    88 }