How to use

isNativeSystemInfoAvailable

method

in

org.rhq.core.system.SystemInfoFactory

URL jarLocation;
if (isNativeSystemInfoAvailable()) {
  rootDir = System.getProperty("rhq.native-libraries-root-directory");
  if (rootDir == null) {

URL jarLocation;
if (isNativeSystemInfoAvailable()) {
  rootDir = System.getProperty("rhq.native-libraries-root-directory");
  if (rootDir == null) {

/**
 * Enables or disables the native layer.
 * @param tokens tokenized command line tokens[0] is the command itself
 */
private void doNative(String[] tokens) {
  String what = tokens[1];
  if (what.startsWith("e")) {
    SystemInfoFactory.enableNativeSystemInfo();
    System.out.println("Native layer enabled.");
  } else if (what.startsWith("d")) {
    SystemInfoFactory.disableNativeSystemInfo();
    System.out.println("Native layer disabled.");
  } else if (what.startsWith("s")) {
    System.out.println("Native layer is:");
    System.out.println(SystemInfoFactory.isNativeSystemInfoDisabled() ? "Disabled" : "Enabled");
    if (!SystemInfoFactory.isNativeSystemInfoDisabled()) {
      System.out.println(SystemInfoFactory.isNativeSystemInfoAvailable() ? "Available" : "Not Available");
      System.out.println(SystemInfoFactory.isNativeSystemInfoInitialized() ? "Initialized" : "Not initialized");
    }
  } else {
    System.err.println("Unknown option. Only 'e', 'd' and 's' are applicable (enable/disable/status)");
    return;
  }
}

public static boolean isSigarAvailable() {
  if (!SystemInfoFactory.isNativeSystemInfoDisabled() && SystemInfoFactory.isNativeSystemInfoAvailable()) {
    // its available, but it may not yet have been initialized. If it has not been initialized,
    // make a call that forces it to be initialized and loaded. 99% of the time, the native layer
    // will already be initialized and this check will be very fast.
    if (!SystemInfoFactory.isNativeSystemInfoInitialized()) {
      SystemInfoFactory.getNativeSystemInfoVersion();
    }
    return true;
  } else {
    return false;
  }
}

public static boolean isSigarAvailable() {
  if (!SystemInfoFactory.isNativeSystemInfoDisabled() && SystemInfoFactory.isNativeSystemInfoAvailable()) {
    // its available, but it may not yet have been initialized. If it has not been initialized,
    // make a call that forces it to be initialized and loaded. 99% of the time, the native layer
    // will already be initialized and this check will be very fast.
    if (!SystemInfoFactory.isNativeSystemInfoInitialized()) {
      SystemInfoFactory.getNativeSystemInfoVersion();
    }
    return true;
  } else {
    return false;
  }
}

/**
 * Returns the appropriate {@link SystemInfo} implementation based on the platform/operating system the JVM is
 * running on.
 *
 * @return a {@link NativeSystemInfo} implementation or a {@link JavaSystemInfo} if the native libraries are
 *         {@link #isNativeSystemInfoAvailable() not available for the platform} or have been
 *         {@link #disableNativeSystemInfo() disabled}.
 */
public static synchronized SystemInfo createSystemInfo() {
  if (cachedSystemInfo == null) {
    initialize(); // make sure we've loaded the native libraries, if appropriate
    SystemInfo nativePlatform = null;
    if (!isNativeSystemInfoDisabled() && isNativeSystemInfoAvailable()) {
      // we could use SIGAR here, but this should be enough
      if (System.getProperty("os.name").toLowerCase().indexOf("windows") > -1) {
        nativePlatform = new WindowsNativeSystemInfo();
      } else {
        // we either don't know what OS it is or we don't have a specific native subclass for it;
        // but we know we have a native library for it! so just create the generic NativePlatform to represent it.
        nativePlatform = new NativeSystemInfo();
      }
    }
    if (nativePlatform == null) {
      nativePlatform = javaSystemInfo;
    }
    cachedSystemInfo = nativePlatform;
  }
  return cachedSystemInfo;
}

/**
 * Returns the appropriate {@link SystemInfo} implementation based on the platform/operating system the JVM is
 * running on.
 *
 * @return a {@link NativeSystemInfo} implementation or a {@link JavaSystemInfo} if the native libraries are
 *         {@link #isNativeSystemInfoAvailable() not available for the platform} or have been
 *         {@link #disableNativeSystemInfo() disabled}.
 */
public static synchronized SystemInfo createSystemInfo() {
  if (cachedSystemInfo == null) {
    initialize(); // make sure we've loaded the native libraries, if appropriate
    SystemInfo nativePlatform = null;
    if (!isNativeSystemInfoDisabled() && isNativeSystemInfoAvailable()) {
      // we could use SIGAR here, but this should be enough
      if (System.getProperty("os.name").toLowerCase().indexOf("windows") > -1) {
        nativePlatform = new WindowsNativeSystemInfo();
      } else {
        // we either don't know what OS it is or we don't have a specific native subclass for it;
        // but we know we have a native library for it! so just create the generic NativePlatform to represent it.
        nativePlatform = new NativeSystemInfo();
      }
    }
    if (nativePlatform == null) {
      nativePlatform = javaSystemInfo;
    }
    cachedSystemInfo = nativePlatform;
  }
  return cachedSystemInfo;
}

/**
 * If the native system is both {@link #isNativeSystemInfoAvailable() available} and
 * {@link #isNativeSystemInfoDisabled() enabled}, this will return the native system's version string. Otherwise, a
 * generic Java version message is returned.
 *
 * @return native system version string
 */
public static synchronized String getNativeSystemInfoVersion() {
  String version = null;
  Throwable error = null;
  initialize(); // make sure we've loaded the native libraries, if appropriate
  if (!isNativeSystemInfoDisabled() && isNativeSystemInfoAvailable()) {
    try {
      version = "Version=" + invokeApi(NativeApi.VERSION_STRING) + " (" + invokeApi(NativeApi.BUILD_DATE)
        + "); Native version=" + invokeApi(NativeApi.NATIVE_VERSION_STRING) + " ("
        + invokeApi(NativeApi.NATIVE_BUILD_DATE) + ")";
    } catch (Throwable t) {
      error = t;
    }
  }
  if (version == null) {
    version = "Native system not supported - Java version is " + System.getProperty("java.version");
    if (error != null) {
      version += " : " + error;
    }
  }
  return version;
}

/**
 * If the native system is both {@link #isNativeSystemInfoAvailable() available} and
 * {@link #isNativeSystemInfoDisabled() enabled}, this will return the native system's version string. Otherwise, a
 * generic Java version message is returned.
 *
 * @return native system version string
 */
public static synchronized String getNativeSystemInfoVersion() {
  String version = null;
  Throwable error = null;
  initialize(); // make sure we've loaded the native libraries, if appropriate
  if (!isNativeSystemInfoDisabled() && isNativeSystemInfoAvailable()) {
    try {
      version = "Version=" + invokeApi(NativeApi.VERSION_STRING) + " (" + invokeApi(NativeApi.BUILD_DATE)
        + "); Native version=" + invokeApi(NativeApi.NATIVE_VERSION_STRING) + " ("
        + invokeApi(NativeApi.NATIVE_BUILD_DATE) + ")";
    } catch (Throwable t) {
      error = t;
    }
  }
  if (version == null) {
    version = "Native system not supported - Java version is " + System.getProperty("java.version");
    if (error != null) {
      version += " : " + error;
    }
  }
  return version;
}