LoadAverage information
- * package. Provides an OpenMBean conform implementation.
- *
- * @author Bjoern Martin
- * @since 1.5
- */
-public class SigarLoadAverage extends AbstractMBean {
+public class SigarLoadAverage extends ReflectedMBean {
private static final String MBEAN_TYPE = "LoadAverage";
- /**
- * Returned if {@link Sigar#getLoadAverage()}} is detected to be not
- * implemented on the platform.
- *
- * @see #notImplemented
- */
- private static final double NOT_IMPLEMENTED_LOAD_VALUE = -1.0d;
-
- private static final MBeanInfo MBEAN_INFO;
-
- private static final MBeanAttributeInfo MBEAN_ATTR_LAST1MIN;
-
- private static final MBeanAttributeInfo MBEAN_ATTR_LAST5MIN;
-
- private static final MBeanAttributeInfo MBEAN_ATTR_LAST15MIN;
-
- private static final MBeanConstructorInfo MBEAN_CONSTR_SIGAR;
-
- private static MBeanParameterInfo MBEAN_PARAM_SIGAR;
-
- static {
- MBEAN_ATTR_LAST1MIN = new MBeanAttributeInfo(
- "LastMinute",
- "double",
- "The load average in the last minute, as a fraction of 1, or "
- + "-1.0 if the load cannot be determined on this platform",
- true, false, false);
- MBEAN_ATTR_LAST5MIN = new MBeanAttributeInfo(
- "LastFiveMinutes",
- "double",
- "The load average over the last five minutes, as a fraction "
- + "of 1, or -1.0 if the load cannot be determined on this platform",
- true, false, false);
- MBEAN_ATTR_LAST15MIN = new MBeanAttributeInfo(
- "Last15Minutes",
- "double",
- "The load average over the last 15 minutes, as a fraction of "
- + "1, or -1.0 if the load cannot be determined on this platform",
- true, false, false);
-
- MBEAN_PARAM_SIGAR = new MBeanParameterInfo("sigar", Sigar.class
- .getName(), "The Sigar instance to use to fetch data from");
-
- MBEAN_CONSTR_SIGAR = new MBeanConstructorInfo(
- SigarLoadAverage.class.getName(),
- "Creates a new instance, using the Sigar instance specified "
- + "to fetch the data. Fails if the CPU index is out of range.",
- new MBeanParameterInfo[] { MBEAN_PARAM_SIGAR });
- MBEAN_INFO = new MBeanInfo(
- SigarLoadAverage.class.getName(),
- "Sigar load average MBean. Provides load averages of the "
- + "system over the last one, five and 15 minutes. Due to the "
- + "long term character of that information, the fetch is done "
- + "using a Sigar proxy cache with a timeout of 30 seconds.",
- new MBeanAttributeInfo[] { MBEAN_ATTR_LAST1MIN,
- MBEAN_ATTR_LAST5MIN, MBEAN_ATTR_LAST15MIN },
- new MBeanConstructorInfo[] { MBEAN_CONSTR_SIGAR }, null, null);
-
+ public SigarLoadAverage(SigarProxy sigar) {
+ super(sigar, MBEAN_TYPE);
}
- /**
- * Object name this instance will give itself when being registered to an
- * MBeanServer.
- */
- private final String objectName;
-
- /**
- * Set true when the load average fetch failed with a
- * SigarException that indicates the method is not implemented.
- * Any subsequent call to this instance will then be answered with
- * {@link #NOT_IMPLEMENTED_LOAD_VALUE}.
- *
FIXME : This is a workaround and should be replaced by something
- * more stable, as the code setting this member true relies on
- * a substring being present within the exception. A proposal was made at
- * issue SIGAR-52.
- *
-1.0d if the load cannot be determined on this platform
- */
- public double getLastMinute() {
+ public Object getAttribute(String name)
+ throws AttributeNotFoundException,
+ MBeanException, ReflectionException {
try {
- return this.sigar.getLoadAverage()[0];
-
+ Object val =
+ new LoadAverage(this.sigar.getLoadAverage()).toMap().get(name);
+ if (val == null) {
+ throw new AttributeNotFoundException(name);
+ }
+ return val;
} catch (SigarNotImplementedException e) {
- return NOT_IMPLEMENTED_LOAD_VALUE;
-
+ return new Double(Sigar.FIELD_NOTIMPL);
} catch (SigarException e) {
- throw unexpectedError(MBEAN_TYPE, e);
+ throw new ReflectionException(e);
}
}
-
- /**
- * @return The load average over the last five minutes, as a fraction of 1,
- * or -1.0d if the load cannot be determined on this
- * platform
- */
- public double getLastFiveMinutes() {
- try {
- return this.sigar.getLoadAverage()[1];
-
- } catch (SigarNotImplementedException e) {
- return NOT_IMPLEMENTED_LOAD_VALUE;
-
- } catch (SigarException e) {
- throw unexpectedError(MBEAN_TYPE, e);
- }
- }
-
- /**
- * @return The load average over the last 15 minutes, as a fraction of 1, or
- * -1.0d if the load cannot be determined on this platform
- */
- public double getLast15Minutes() {
- try {
- return this.sigar.getLoadAverage()[2];
-
- } catch (SigarNotImplementedException e) {
- return NOT_IMPLEMENTED_LOAD_VALUE;
-
- } catch (SigarException e) {
- throw unexpectedError(MBEAN_TYPE, e);
- }
- }
-
- // -------
- // Implementation of the DynamicMBean interface
- // -------
-
- /*
- * (non-Javadoc)
- *
- * @see DynamicMBean#getAttribute(String)
- */
- public Object getAttribute(String attr) throws AttributeNotFoundException {
-
- if (MBEAN_ATTR_LAST1MIN.getName().equals(attr)) {
- return new Double(getLastMinute());
-
- } else if (MBEAN_ATTR_LAST5MIN.getName().equals(attr)) {
- return new Double(getLastFiveMinutes());
-
- } else if (MBEAN_ATTR_LAST15MIN.getName().equals(attr)) {
- return new Double(getLast15Minutes());
-
- } else {
- throw new AttributeNotFoundException(attr);
- }
- }
-
- /*
- * (non-Javadoc)
- *
- * @see DynamicMBean#setAttribute(Attribute)
- */
- public void setAttribute(Attribute attr) throws AttributeNotFoundException {
- throw new AttributeNotFoundException(attr.getName());
- }
-
- /*
- * (non-Javadoc)
- *
- * @see DynamicMBean#invoke(String, Object[], String[])
- */
- public Object invoke(String actionName, Object[] params, String[] signature)
- throws ReflectionException {
- throw new ReflectionException(new NoSuchMethodException(actionName),
- actionName);
- }
-
- /*
- * (non-Javadoc)
- *
- * @see DynamicMBean#getMBeanInfo()
- */
- public MBeanInfo getMBeanInfo() {
- return MBEAN_INFO;
- }
}