oshi.hardware.platform.unix.aix.AixVirtualMemory Maven / Gradle / Ivy

Go to download
/**
 * MIT License
 *
 * Copyright (c) 2010 - 2021 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package oshi.hardware.platform.unix.aix;

import java.util.function.Supplier;

import com.sun.jna.platform.unix.aix.Perfstat.perfstat_memory_total_t; // NOSONAR squid:S1191

import oshi.annotation.concurrent.ThreadSafe;
import oshi.hardware.common.AbstractVirtualMemory;

/**
 * Memory obtained by perfstat_memory_total_t
 */
@ThreadSafe
final class AixVirtualMemory extends AbstractVirtualMemory {

    // Memoized perfstat from GlobalMemory
    private final Supplier perfstatMem;

    // AIX has multiple page size units, but for purposes of "pages" in perfstat,
    // the docs specify 4KB pages so we hardcode this
    private static final long PAGESIZE = 4096L;

    /**
     * Constructor for SolarisVirtualMemory.
     *
     * @param perfstatMem
     *            The memoized perfstat data from the global memory class
     */
    AixVirtualMemory(Supplier perfstatMem) {
        this.perfstatMem = perfstatMem;
    }

    @Override
    public long getSwapUsed() {
        perfstat_memory_total_t perfstat = perfstatMem.get();
        return (perfstat.pgsp_total - perfstat.pgsp_free) * PAGESIZE;
    }

    @Override
    public long getSwapTotal() {
        return perfstatMem.get().pgsp_total * PAGESIZE;
    }

    @Override
    public long getVirtualMax() {
        return perfstatMem.get().virt_total * PAGESIZE;
    }

    @Override
    public long getVirtualInUse() {
        return perfstatMem.get().virt_active * PAGESIZE;
    }

    @Override
    public long getSwapPagesIn() {
        return perfstatMem.get().pgspins;
    }

    @Override
    public long getSwapPagesOut() {
        return perfstatMem.get().pgspouts;
    }
}