oshi.driver.unix.aix.perfstat.PerfstatProcess 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 java.util.Arrays;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.jna.platform.unix.aix.Perfstat;
import oshi.jna.platform.unix.aix.Perfstat.perfstat_id_t;
import oshi.jna.platform.unix.aix.Perfstat.perfstat_process_t;
/**
* Utility to query performance stats for processes
*/
@ThreadSafe
public final class PerfstatProcess {
private static final Perfstat PERF = Perfstat.INSTANCE;
private PerfstatProcess() {
}
/**
* Queries perfstat_process for per-process usage statistics
*
* @return an array of usage statistics
*/
public static perfstat_process_t[] queryProcesses() {
perfstat_process_t process = new perfstat_process_t();
// With null, null, ..., 0, returns total # of elements
int procCount = PERF.perfstat_process(null, null, process.size(), 0);
if (procCount > 0) {
perfstat_process_t[] proct = (perfstat_process_t[]) process.toArray(procCount);
perfstat_id_t firstprocess = new perfstat_id_t(); // name is ""
int ret = PERF.perfstat_process(firstprocess, proct, process.size(), procCount);
if (ret > 0) {
return Arrays.copyOf(proct, ret);
}
}
return new perfstat_process_t[0];
}
}