Mercurial > hg > thermostat
view common/portability/src/main/java/com/redhat/thermostat/common/portability/SysConf.java @ 2626:9d83a097c50c
Fix COPR build
This patch reworks some of the common-portability code to properly separate factories from what they create.
Reviewed-by: sgehwolf, neugens
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2017-April/022786.html
author | Simon Tooke <stooke@redhat.com> |
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date | Fri, 14 Apr 2017 11:23:45 -0400 |
parents | 15a168c5a68d |
children |
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/* * Copyright 2012-2017 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat 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 for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.common.portability; import com.redhat.thermostat.shared.config.OS; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /** * A wrapper over POSIX's sysconf. * <p> * Implementation notes: uses {@code getconf(1)} */ public class SysConf { private SysConf() { /* do not initialize */ } public static long getClockTicksPerSecond() { return OS.IS_LINUX ? getLinuxClockTicksPerSecond() : getWindowsClockTicksPerSecond(); } private static long getWindowsClockTicksPerSecond() { return PortableHostFactory.getInstance().getClockTicksPerSecond(); } public static long getLinuxClockTicksPerSecond() { String ticks = sysConf("CLK_TCK"); try { return Long.valueOf(ticks); } catch (NumberFormatException nfe) { return 0; } } public static long getPageSize() { try { return Long.valueOf(sysConf("PAGESIZE")); } catch (NumberFormatException nfe) { return 0; } } private static String sysConf(String arg) { try { Process process = Runtime.getRuntime().exec(new String[] { "getconf", arg }); int result = process.waitFor(); if (result != 0) { return null; } try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) { return reader.readLine(); } } catch (IOException | InterruptedException e) { return null; } } }