游戏服务器监控的设计与实现（三）

系统信息采集方面，选择使用Sigar的第三方库。

对于Sigar做一个简单的梳理。

服务器监控，一方面要对游戏服务器的数据进行采集，另一方面也要对游戏服务器所在的系统信息进行采集。我打算使用sigar来获取系统信息的采集工作。其Demo非常完整，并且跨平台支持，本身对于.net,C++，php,python,java,perl,ruby都是支持的，为以后的扩展和更改留有很多的余地。

sigar网址：https://support.hyperic.com/display/SIGAR/Home;jsessionid=93D9F25FC4BE420D102F15793F9EF0E1

sigar本身是带log4j的日志框架

sigar的Java实现主要还是调用本地的库，所以需要根据不同的平台引入相应的本地库。例如windows平台，就应当在构建工程的时候设置NativeLib：sigar-x86-winnt.dll、sigar-x86-winnt.lib、sigar-amd64-winnt

并引入sigar.jar，看一个官方获取系统信息的代码：

/*
 * Copyright (c) 2006-2009 Hyperic, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.hyperic.sigar.cmd;

import java.io.File;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.UnknownHostException;

import org.hyperic.sigar.OperatingSystem;
import org.hyperic.sigar.Sigar;
import org.hyperic.sigar.SigarException;
import org.hyperic.sigar.SigarLoader;

import org.hyperic.sigar.win32.LocaleInfo;

/**
 * Display Sigar, java and system version information.
 */
public class Version extends SigarCommandBase {

    public Version(Shell shell) {
        super(shell);
    }

    public Version() {
        super();
    }

    public String getUsageShort() {
        return "Display sigar and system version info";
    }

    private static String getHostName() {
        try {
            return InetAddress.getLocalHost().getHostName();
        } catch (UnknownHostException e) {
            return "unknown";
        }
    }

    private static void printNativeInfo(PrintStream os) {
        String version =
            "java=" + Sigar.VERSION_STRING +
            ", native=" + Sigar.NATIVE_VERSION_STRING;
        String build =
            "java=" + Sigar.BUILD_DATE +
            ", native=" + Sigar.NATIVE_BUILD_DATE;
        String scm =
            "java=" + Sigar.SCM_REVISION +
            ", native=" + Sigar.NATIVE_SCM_REVISION;
        String archlib =
            SigarLoader.getNativeLibraryName();

        os.println("Sigar version......." + version);
        os.println("Build date.........." + build);
        os.println("SCM rev............." + scm);
        String host = getHostName();
        String fqdn;
        Sigar sigar = new Sigar(); 
        try {
            File lib = sigar.getNativeLibrary();
            if (lib != null) {
                archlib = lib.getName();
            }
            fqdn = sigar.getFQDN();
        } catch (SigarException e) {
            fqdn = "unknown";
        } finally {
            sigar.close();
        }

        os.println("Archlib............." + archlib);

        os.println("Current fqdn........" + fqdn);
        if (!fqdn.equals(host)) {
            os.println("Hostname............" + host);
        }        

        if (SigarLoader.IS_WIN32) {
            LocaleInfo info = new LocaleInfo();
            os.println("Language............" + info);
            os.println("Perflib lang id....." +
                       info.getPerflibLangId());
        }
    }
    
    public static void printInfo(PrintStream os) {
        try {
            printNativeInfo(os);
        } catch (UnsatisfiedLinkError e) {
            os.println("*******ERROR******* " + e);
        }

        os.println("Current user........" +
                   System.getProperty("user.name"));
        os.println("");
        
        OperatingSystem sys = OperatingSystem.getInstance();
        os.println("OS description......" + sys.getDescription());
        os.println("OS name............." + sys.getName());
        os.println("OS arch............." + sys.getArch());
        os.println("OS machine.........." + sys.getMachine());
        os.println("OS version.........." + sys.getVersion());
        os.println("OS patch level......" + sys.getPatchLevel());
        os.println("OS vendor..........." + sys.getVendor());
        os.println("OS vendor version..." + sys.getVendorVersion());
        if (sys.getVendorCodeName() != null) {
            os.println("OS code name........" + sys.getVendorCodeName());
        }
        os.println("OS data model......." + sys.getDataModel());
        os.println("OS cpu endian......." + sys.getCpuEndian());

        os.println("Java vm version....." + 
                   System.getProperty("java.vm.version"));
        os.println("Java vm vendor......" + 
                System.getProperty("java.vm.vendor"));
        os.println("Java home..........." +
                System.getProperty("java.home"));
    }

    public void output(String[] args) {
        printInfo(this.out);
    }

    public static void main(String[] args) throws Exception {
        new Version().processCommand(args);
    }
}

其他的信息获取也类似，均是采用单例的方式，但是在一些时候获取并不方便，需要我们根据具体的情况做一些上层的封装。但是已经很便捷了。并且sigar本身对于输出格式是可以进行设置，例如CPU相关信息的的百分制的方式。

private void output(CpuPerc cpu) {
        println("User Time....." + CpuPerc.format(cpu.getUser()));
        println("Sys Time......" + CpuPerc.format(cpu.getSys()));
        println("Idle Time....." + CpuPerc.format(cpu.getIdle()));
        println("Wait Time....." + CpuPerc.format(cpu.getWait()));
        println("Nice Time....." + CpuPerc.format(cpu.getNice()));
        println("Combined......" + CpuPerc.format(cpu.getCombined()));
        println("Irq Time......" + CpuPerc.format(cpu.getIrq()));
        if (SigarLoader.IS_LINUX) {
            println("SoftIrq Time.." + CpuPerc.format(cpu.getSoftIrq()));
            println("Stolen Time...." + CpuPerc.format(cpu.getStolen()));
        }
        println("");
    }

并且Java的库主要是根据shell命令来进行区分的，非常的容易辨识，除此之外，官方Java例子还对Shell命令的跨平台进行了统一，其实就是对所有Demo里的Java代码做了一个整体性质的使用吧算是。官方Demo有兴趣可以去看下，但是已经不是下面提到的目录了，而是bingings/java/examples/Shell.java。

sigar本身的稳定性而言，应该不用过多的质疑。以下是一些项目使用了sigar采集系统信息的项目，足见其稳定性。