test/jdk/com/sun/management/UnixOperatingSystemMXBean/GetOpenFileDescriptorCount.java - master - githubmirror/jdk21u-dev

test/jdk/com/sun/management/UnixOperatingSystemMXBean/GetOpenFileDescriptorCount.java

65 строк2 KB

Bill Huang

8290180: Convert com/sun/management/UnixOperatingSystemMXBean/GetOpenFileDescriptorCount.sh to jtreg java version

08 авг 2022, 18:06

08 авг 2022, 18:06124fc4a

/*
 * Copyright (c) 2003, 2022, 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     4858522
 * @summary Basic unit test of UnixOperatingSystemMXBean.getOpenFileDescriptorCount()
 * @author  Steve Bohne
 * @requires os.family != "windows"
 *
 * @run main GetOpenFileDescriptorCount
 */

import com.sun.management.UnixOperatingSystemMXBean;
import java.lang.management.*;

public class GetOpenFileDescriptorCount {

    private static UnixOperatingSystemMXBean mbean =
        (UnixOperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();

    private static final long MIN_COUNT_FOR_PASS = 1;
    private static long       maxCountForPass = Long.MAX_VALUE;

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

        long maxCount = mbean.getMaxFileDescriptorCount();
        if (maxCount > 0) {
            maxCountForPass = maxCount;
        }

        long count = mbean.getOpenFileDescriptorCount();

        System.out.println("Open file descriptor count: " + count);

        if (count < MIN_COUNT_FOR_PASS || count > maxCountForPass) {
            throw new RuntimeException("Open file descriptor count " +
                                       "illegal value: " + count + " bytes " +
                                       "(MIN = " + MIN_COUNT_FOR_PASS + "; " +
                                       "MAX = " + maxCountForPass + ")");
        }

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