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*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
/*
* @test
* @bug 4858522
* @summary Basic unit test of OperatingSystemMXBean.getFreeSwapSpaceSize()
* @author Steve Bohne
*/
/*
* This test is just a sanity check and does not check for the correct
* value. The correct value should be checked manually:
* Solaris:
* 1. In a shell, enter the command: "swap -l"
* 2. The value (reported in blocks) is in the "free" column.
* Linux:
* 1. In a shell, enter the command: "cat /proc/meminfo"
* 2. The value (reported in bytes) is in "Swap" entry, "free" column.
* Windows NT/XP/2000:
* Unknown.
* Windows 98/ME:
* Unknown.
*/
import com.sun.management.OperatingSystemMXBean;
import java.lang.management.*;
public class GetFreeSwapSpaceSize {
private static OperatingSystemMXBean mbean =
(com.sun.management.OperatingSystemMXBean)
ManagementFactory.getOperatingSystemMXBean();
// Careful with these values.
// Min size is zero since the system can run of swap spaces
private static final long MIN_SIZE_FOR_PASS = 0;
// Max size for pass dynamically determined below.
private static long max_size_for_pass = Long.MAX_VALUE;
private static boolean trace = false;
public static void main(String args[]) throws Exception {
if (args.length > 0 && args[0].equals("trace")) {
trace = true;
}
long max_size = mbean.getTotalSwapSpaceSize();
if (max_size > 0) {
max_size_for_pass = max_size;
}
long size = mbean.getFreeSwapSpaceSize();
if (trace) {
System.out.println("Free swap space size in bytes: " + size);
}
if (size < MIN_SIZE_FOR_PASS || size > max_size_for_pass) {
throw new RuntimeException("Free swap space size " +
"illegal value: " + size + " bytes " +
"(MIN = " + MIN_SIZE_FOR_PASS + "; " +
"MAX = " + max_size_for_pass + ")");
}
System.out.println("Test passed.");
}
}