/**
* @param predicate
* @return a {@link ThresholdPredicate}.
* @throws ThresholdRuleValidationError
*/
static ThresholdPredicate from(final String predicate) throws ThresholdRuleValidationError {
for (final ThresholdPredicate p : ThresholdPredicate.values())
if (p.name.equals(predicate)) return p;
throw new ThresholdRuleValidationError(
"invalid rule specification: unsupported predicate: " + predicate);
}
/**
* Constructor.
*
* @param bean
*/
private ThresholdRequirement(final ThresholdRequirementBean bean) {
this.thresholdValue = bean.getThreshold();
this.metric = bean.getMetric();
this.pred = ThresholdPredicate.from(bean.getPredicate());
this.foldMethod =
bean.getAggregationMethod() != null
? ThresholdFold.from(bean.getAggregationMethod())
: null;
}
/**
* @param e the event to check for violation metrics.
* @param filterUnits
* @return the particular monitored metric violation or <code>null</code>, or <code>null</code>.
*/
Violation isViolated(final MonitoringEvent e, final List<String> filterUnits) {
final double observedValue = (Double) e.get(metric);
final boolean res = pred.perform(observedValue, thresholdValue);
if (!res) return null;
final ArrayList<String> applicable = new ArrayList<String>(filterUnits.size());
for (final String filterUnit : filterUnits)
if (ThresholdRulesTraits.join(e).startsWith(filterUnit)) applicable.add(filterUnit);
return new Violation(metric, thresholdValue, observedValue, applicable);
}
/**
* @param events the list of events to check for violation metrics.
* @param filterUnits
* @return the particular monitored metric violation or <code>null</code>, or <code>null</code>.
*/
Violation isViolated(final List<MonitoringEvent> events, final List<String> filterUnits) {
// FIXME: should check specific filterUnit
final double observedValue = performFold(events);
final boolean res = pred.perform(observedValue, thresholdValue);
if (!res) return null;
final ArrayList<String> applicable = new ArrayList<String>(filterUnits.size());
for (final String filterUnit : filterUnits)
for (final MonitoringEvent e : events)
if (ThresholdRulesTraits.join(e).startsWith(filterUnit)) applicable.add(filterUnit);
return new Violation(metric, thresholdValue, observedValue, null);
}
