org.hawkular.metrics.alerter

Class ConditionEvaluator

java.lang.Object

org.hawkular.metrics.alerter.ConditionEvaluator

public class ConditionEvaluator
extends Object

This class is responsible for resolving the ConditionExpression eval expression string. See here for the supported expression format. The expression syntax is extended with supported query variables of the form q(queryName,functionName) where the queryName is a variable referring to a query defined for the ConditionExpression and the functionName is a supported aggregate function for the query's MetricType. The query variables are replaced with actual data at query time, before the eval expression is resolved.

Author:

Jay Shaughnessy, Lucas Ponce

Constructor Summary

Constructors

Constructor and Description
ConditionEvaluator(String eval)

Method Summary

Modifier and Type	Method and Description
boolean	evaluate() Evaluate the prepared condition {@see #prepare(Map)).
String	getEval()
com.udojava.evalex.Expression	getExpression()
Map<String,org.hawkular.metrics.alerter.ConditionEvaluator.QueryFunc>	getQueryVars()
Map<String,String>	prepare(Map<String,org.hawkular.metrics.model.BucketPoint> queryMap) Prepare to evaluate by supplying the required query data.
boolean	prepareAndEvaluate(Map<String,org.hawkular.metrics.model.BucketPoint> queryMap) Just a convenience method to prepare and evaluate in one call.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConditionEvaluator

public ConditionEvaluator(String eval)

Method Detail

getEval

public String getEval()

prepare

public Map<String,String> prepare(Map<String,org.hawkular.metrics.model.BucketPoint> queryMap)
                           throws IllegalArgumentException

Prepare to evaluate by supplying the required query data.

Parameters:

data - Map queryName => queryResults

Returns:

Map of the query variable replacement values used in the evaluation

Throws:

IllegalArgumentException

evaluate

public boolean evaluate()

Evaluate the prepared condition {@see #prepare(Map)).

Returns:

true if expression resolves to true, otherwise false

prepareAndEvaluate

public boolean prepareAndEvaluate(Map<String,org.hawkular.metrics.model.BucketPoint> queryMap)

Just a convenience method to prepare and evaluate in one call.

Returns:

true if expression resolves to true, otherwise false

getQueryVars

public Map<String,org.hawkular.metrics.alerter.ConditionEvaluator.QueryFunc> getQueryVars()

getExpression

public com.udojava.evalex.Expression getExpression()