/*

 * Copyright (c) 2003, 2015, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

package com.sun.management.internal;

import com.sun.management.OperatingSystemMXBean;

import sun.management.BaseOperatingSystemImpl;

import sun.management.VMManagement;

/**

 * Implementation class for the operating system.

 * Standard and committed hotspot-specific metrics if any.

 *

 * ManagementFactory.getOperatingSystemMXBean() returns an instance

 * of this class.

 */

class OperatingSystemImpl extends BaseOperatingSystemImpl

    implements OperatingSystemMXBean {

    // psapiLock is a lock to make sure only one thread loading

    // PSAPI DLL.

    private static Object psapiLock = new Object();

    OperatingSystemImpl(VMManagement vm) {

        super(vm);

    }

    @Override

    public long getCommittedVirtualMemorySize() {

        synchronized (psapiLock) {

            return getCommittedVirtualMemorySize0();

        }

    }

    @Override

    public long getTotalSwapSpaceSize() {

        return getTotalSwapSpaceSize0();

    }

    @Override

    public long getFreeSwapSpaceSize() {

        return getFreeSwapSpaceSize0();

    }

    @Override

    public long getProcessCpuTime() {

        return getProcessCpuTime0();

    }

    @Override

    public long getFreePhysicalMemorySize() {

        return getFreePhysicalMemorySize0();

    }

    @Override

    public long getTotalPhysicalMemorySize() {

        return getTotalPhysicalMemorySize0();

    }

    @Override

    public double getSystemCpuLoad() {

        return getSystemCpuLoad0();

    }

    @Override

    public double getProcessCpuLoad() {

        return getProcessCpuLoad0();

    }

    /* native methods */

    private native long getCommittedVirtualMemorySize0();

    private native long getFreePhysicalMemorySize0();

    private native long getFreeSwapSpaceSize0();

    private native double getProcessCpuLoad0();

    private native long getProcessCpuTime0();

    private native double getSystemCpuLoad0();

    private native long getTotalPhysicalMemorySize0();

    private native long getTotalSwapSpaceSize0();

    static {

        initialize0();

    }

    private static native void initialize0();

}