load sigar library

OsCheck.java

/**
 * helper class to check the operating system this Java VM runs in
 * http://stackoverflow.com/questions/228477/how-do-i-programmatically-determine-operating-system-in-java
 * compare to http://svn.terracotta.org/svn/tc/dso/tags/2.6.4/code/base/common/src/com/tc/util/runtime/Os.java
 * http://www.docjar.com/html/api/org/apache/commons/lang/SystemUtils.java.html
 */
public final class OsCheck {
  /**
   * types of Operating Systems
   */
  public enum OSType {
    Windows, MacOS, Linux, Other
  }

  protected static OSType detectedOS;

  /**
   * detected the operating system from the os.name System property and cache
   * the result
   * 
   * @returns - the operating system detected
   */
  public static OSType getOperatingSystemType() {
    if (detectedOS == null) {
      String OS = System.getProperty("os.name", "generic").toLowerCase();
      if (OS.indexOf("win") >= 0) {
        detectedOS = OSType.Windows;
      } else if ((OS.indexOf("mac") >= 0) || (OS.indexOf("darwin") >= 0)) {
        detectedOS = OSType.MacOS;
      } else if (OS.indexOf("nux") >= 0) {
        detectedOS = OSType.Linux;
      } else {
        detectedOS = OSType.Other;
      }
    }
    return detectedOS;
  }
}

SigarUtil.java

import com.google.common.io.Resources;
import org.hyperic.sigar.Sigar;

import java.io.File;
import java.io.IOException;

/**
 * @author gaohui
 * @date 13-11-27 19:43
 */
public class SigarUtil {

    public final static Sigar sigar = initSigar();

    private static Sigar initSigar() {
        try {
            String file = Resources.getResource("sigar/.sigar_shellrc").getFile();
            File classPath = new File(file).getParentFile();

            String path = System.getProperty("java.library.path");
            if (OsCheck.getOperatingSystemType() == OsCheck.OSType.Windows) {
                path += ";" + classPath.getCanonicalPath();
            } else {
                path += ":" + classPath.getCanonicalPath();
            }
            System.setProperty("java.library.path", path);

            return new Sigar();
        } catch (Exception e) {
            return null;
        }
    }
}