oshi.driver.unix.aix.Who 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;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.util.ExecutingCommand;
/**
* Utility to query logged in users.
*/
@ThreadSafe
public final class Who {
// sample format:
// system boot 2020-06-16 09:12
private static final Pattern BOOT_FORMAT_AIX = Pattern.compile("\\D+(\\d{4}-\\d{2}-\\d{2})\\s+(\\d{2}:\\d{2}).*");
private static final DateTimeFormatter BOOT_DATE_FORMAT_AIX = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
private Who() {
}
/**
* Query {@code who -b} to get boot time
*
* @return Boot time in milliseconds since the epoch
*/
public static long queryBootTime() {
String s = ExecutingCommand.getFirstAnswer("who -b");
Matcher m = BOOT_FORMAT_AIX.matcher(s);
if (m.matches()) {
try {
return LocalDateTime.parse(m.group(1) + " " + m.group(2), BOOT_DATE_FORMAT_AIX)
.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
} catch (DateTimeParseException | NullPointerException e) {
// Shouldn't happen with regex matching
}
}
return 0L;
}
}