oshi.driver.unix.aix.perfstat.PerfstatDisk Maven / Gradle / Ivy
/**
* MIT License
*
* Copyright (c) 2010 - 2020 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.driver.unix.aix.perfstat;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.jna.platform.unix.aix.Perfstat;
import oshi.jna.platform.unix.aix.Perfstat.perfstat_disk_t;
import oshi.jna.platform.unix.aix.Perfstat.perfstat_id_t;
/**
* Utility to query performance stats for disk_stats
*/
@ThreadSafe
public final class PerfstatDisk {
private static final Perfstat PERF = Perfstat.INSTANCE;
private PerfstatDisk() {
}
/**
* Queries perfstat_disk for per-disk usage statistics
*
* @return an array of usage statistics
*/
public static perfstat_disk_t[] queryDiskStats() {
perfstat_disk_t diskStats = new perfstat_disk_t();
// With null, null, ..., 0, returns total # of elements
int total = PERF.perfstat_disk(null, null, diskStats.size(), 0);
if (total > 0) {
perfstat_disk_t[] statp = (perfstat_disk_t[]) diskStats.toArray(total);
perfstat_id_t firstdiskStats = new perfstat_id_t(); // name is ""
int ret = PERF.perfstat_disk(firstdiskStats, statp, diskStats.size(), total);
if (ret > 0) {
return statp;
}
}
return new perfstat_disk_t[0];
}
}