extend ReflectedMBean
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Doug MacEachern
parent
b004072d48
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7157234182
@ -1,5 +1,5 @@
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/*
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* Copyright (C) [2004, 2005, 2006, 2007], Hyperic, Inc.
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* Copyright (C) [2004-2009], Hyperic, Inc.
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* This file is part of SIGAR.
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*
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* SIGAR is free software; you can redistribute it and/or modify
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@ -18,237 +18,38 @@
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package org.hyperic.sigar.jmx;
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import javax.management.Attribute;
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import javax.management.AttributeNotFoundException;
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import javax.management.MBeanAttributeInfo;
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import javax.management.MBeanConstructorInfo;
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import javax.management.MBeanInfo;
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import javax.management.MBeanParameterInfo;
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import javax.management.MBeanException;
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import javax.management.ReflectionException;
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import org.hyperic.sigar.LoadAverage;
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import org.hyperic.sigar.Sigar;
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import org.hyperic.sigar.SigarException;
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import org.hyperic.sigar.SigarNotImplementedException;
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import org.hyperic.sigar.SigarProxy;
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/**
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* Sigar JMX MBean implementation for the <code>LoadAverage</code> information
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* package. Provides an OpenMBean conform implementation.
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*
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* @author Bjoern Martin
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* @since 1.5
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*/
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public class SigarLoadAverage extends AbstractMBean {
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public class SigarLoadAverage extends ReflectedMBean {
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private static final String MBEAN_TYPE = "LoadAverage";
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/**
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* Returned if {@link Sigar#getLoadAverage()}} is detected to be not
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* implemented on the platform.
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*
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* @see #notImplemented
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*/
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private static final double NOT_IMPLEMENTED_LOAD_VALUE = -1.0d;
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private static final MBeanInfo MBEAN_INFO;
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private static final MBeanAttributeInfo MBEAN_ATTR_LAST1MIN;
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private static final MBeanAttributeInfo MBEAN_ATTR_LAST5MIN;
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private static final MBeanAttributeInfo MBEAN_ATTR_LAST15MIN;
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private static final MBeanConstructorInfo MBEAN_CONSTR_SIGAR;
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private static MBeanParameterInfo MBEAN_PARAM_SIGAR;
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static {
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MBEAN_ATTR_LAST1MIN = new MBeanAttributeInfo(
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"LastMinute",
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"double",
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"The load average in the last minute, as a fraction of 1, or "
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+ "-1.0 if the load cannot be determined on this platform",
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true, false, false);
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MBEAN_ATTR_LAST5MIN = new MBeanAttributeInfo(
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"LastFiveMinutes",
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"double",
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"The load average over the last five minutes, as a fraction "
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+ "of 1, or -1.0 if the load cannot be determined on this platform",
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true, false, false);
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MBEAN_ATTR_LAST15MIN = new MBeanAttributeInfo(
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"Last15Minutes",
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"double",
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"The load average over the last 15 minutes, as a fraction of "
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+ "1, or -1.0 if the load cannot be determined on this platform",
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true, false, false);
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MBEAN_PARAM_SIGAR = new MBeanParameterInfo("sigar", Sigar.class
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.getName(), "The Sigar instance to use to fetch data from");
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MBEAN_CONSTR_SIGAR = new MBeanConstructorInfo(
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SigarLoadAverage.class.getName(),
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"Creates a new instance, using the Sigar instance specified "
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+ "to fetch the data. Fails if the CPU index is out of range.",
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new MBeanParameterInfo[] { MBEAN_PARAM_SIGAR });
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MBEAN_INFO = new MBeanInfo(
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SigarLoadAverage.class.getName(),
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"Sigar load average MBean. Provides load averages of the "
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+ "system over the last one, five and 15 minutes. Due to the "
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+ "long term character of that information, the fetch is done "
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+ "using a Sigar proxy cache with a timeout of 30 seconds.",
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new MBeanAttributeInfo[] { MBEAN_ATTR_LAST1MIN,
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MBEAN_ATTR_LAST5MIN, MBEAN_ATTR_LAST15MIN },
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new MBeanConstructorInfo[] { MBEAN_CONSTR_SIGAR }, null, null);
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public SigarLoadAverage(SigarProxy sigar) {
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super(sigar, MBEAN_TYPE);
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}
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/**
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* Object name this instance will give itself when being registered to an
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* MBeanServer.
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*/
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private final String objectName;
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/**
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* <p>Set <code>true</code> when the load average fetch failed with a
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* <code>SigarException</code> that indicates the method is not implemented.
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* Any subsequent call to this instance will then be answered with
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* {@link #NOT_IMPLEMENTED_LOAD_VALUE}.
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* </p>
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*
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* <p><b>FIXME</b> : This is a workaround and should be replaced by something
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* more stable, as the code setting this member <code>true</code> relies on
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* a substring being present within the exception. A proposal was made at
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* <a href="http://jira.hyperic.com/browse/SIGAR-52">issue SIGAR-52</a>.
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* </p>
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*/
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private boolean notImplemented;
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/**
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* Creates a new instance, using the Sigar instance specified to fetch the
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* data.
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*
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* @param sigar
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* The Sigar instance to use to fetch data from
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*
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* @throws IllegalArgumentException
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* If an unexpected Sigar error occurs
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*/
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public SigarLoadAverage(SigarProxy sigar) throws IllegalArgumentException {
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super(sigar);
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// all fine
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this.objectName = MBEAN_DOMAIN + ":" + MBEAN_ATTR_TYPE
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+ "=" + MBEAN_TYPE;
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}
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/**
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* Object name this instance will give itself when being registered to an
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* MBeanServer.
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*/
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public String getObjectName() {
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return this.objectName;
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}
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/**
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* @return The load average in the last minute, as a fraction of 1, or
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* <code>-1.0d</code> if the load cannot be determined on this platform
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*/
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public double getLastMinute() {
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public Object getAttribute(String name)
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throws AttributeNotFoundException,
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MBeanException, ReflectionException {
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try {
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return this.sigar.getLoadAverage()[0];
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Object val =
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new LoadAverage(this.sigar.getLoadAverage()).toMap().get(name);
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if (val == null) {
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throw new AttributeNotFoundException(name);
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}
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return val;
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} catch (SigarNotImplementedException e) {
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return NOT_IMPLEMENTED_LOAD_VALUE;
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return new Double(Sigar.FIELD_NOTIMPL);
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} catch (SigarException e) {
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throw unexpectedError(MBEAN_TYPE, e);
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throw new ReflectionException(e);
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}
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}
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/**
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* @return The load average over the last five minutes, as a fraction of 1,
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* or <code>-1.0d</code> if the load cannot be determined on this
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* platform
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*/
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public double getLastFiveMinutes() {
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try {
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return this.sigar.getLoadAverage()[1];
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} catch (SigarNotImplementedException e) {
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return NOT_IMPLEMENTED_LOAD_VALUE;
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} catch (SigarException e) {
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throw unexpectedError(MBEAN_TYPE, e);
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}
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}
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/**
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* @return The load average over the last 15 minutes, as a fraction of 1, or
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* <code>-1.0d</code> if the load cannot be determined on this platform
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*/
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public double getLast15Minutes() {
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try {
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return this.sigar.getLoadAverage()[2];
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} catch (SigarNotImplementedException e) {
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return NOT_IMPLEMENTED_LOAD_VALUE;
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} catch (SigarException e) {
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throw unexpectedError(MBEAN_TYPE, e);
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}
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}
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// -------
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// Implementation of the DynamicMBean interface
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// -------
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/*
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* (non-Javadoc)
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*
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* @see DynamicMBean#getAttribute(String)
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*/
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public Object getAttribute(String attr) throws AttributeNotFoundException {
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if (MBEAN_ATTR_LAST1MIN.getName().equals(attr)) {
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return new Double(getLastMinute());
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} else if (MBEAN_ATTR_LAST5MIN.getName().equals(attr)) {
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return new Double(getLastFiveMinutes());
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} else if (MBEAN_ATTR_LAST15MIN.getName().equals(attr)) {
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return new Double(getLast15Minutes());
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} else {
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throw new AttributeNotFoundException(attr);
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}
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}
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/*
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* (non-Javadoc)
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*
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* @see DynamicMBean#setAttribute(Attribute)
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*/
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public void setAttribute(Attribute attr) throws AttributeNotFoundException {
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throw new AttributeNotFoundException(attr.getName());
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}
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/*
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* (non-Javadoc)
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*
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* @see DynamicMBean#invoke(String, Object[], String[])
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*/
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public Object invoke(String actionName, Object[] params, String[] signature)
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throws ReflectionException {
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throw new ReflectionException(new NoSuchMethodException(actionName),
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actionName);
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}
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/*
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* (non-Javadoc)
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*
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* @see DynamicMBean#getMBeanInfo()
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*/
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public MBeanInfo getMBeanInfo() {
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return MBEAN_INFO;
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}
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}
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