/**
* Reads in the numeric value of mapped to the tabularDataKey value specified when this object was
* created
*
* @param jmxConnection
* @param f
* @param beanName
* @throws Exception
*/
protected void readValueFromBean(
MBeanServerConnection jmxConnection, AggregateFunction f, ObjectName beanName)
throws Exception {
checkBeanExists(jmxConnection, beanName);
Object attribute = safelyGetAttribute(jmxConnection, beanName);
if (!(attribute instanceof TabularData)) {
raiseValueException("The attribute was not of type TabularData");
}
TabularData tabularData = (TabularData) attribute;
Object[] key = {tabularDataKey};
if (!tabularData.containsKey(key)) {
raiseValueException("No value is available for the key Object[] {" + tabularDataKey + "}");
}
CompositeData compositeData = null;
try {
compositeData = tabularData.get(key);
} catch (InvalidKeyException k) {
raiseValueException("The TabularDataKey " + tabularDataKey + " was invalid", k);
}
if (compositeData == null) {
raiseValueException(
"Even after checking the TabularDataKey "
+ tabularDataKey
+ " existed, we were still return a null value");
// key asynchronously removed on remote server?, probably possible, but never seen it
}
Object value = getValueFromCompositeData(compositeData, "value");
if (value == null) {
raiseValueException(
"The value attribute of the CompositeDataItem with tabular key "
+ tabularDataKey
+ " was null");
}
Double v = convertToDouble(value);
// yippee! after all this checking we actually have a value!
f.addValue(v);
}
