com.netflix.spectator.atlas.impl

Class Evaluator

java.lang.Object

com.netflix.spectator.atlas.impl.Evaluator

public class Evaluator
extends Object

Evaluates all the expressions for a set of subscriptions.

Classes in this package are only intended for use internally within spectator. They may change at any time and without notice.

Constructor Summary

Constructors

Constructor and Description
Evaluator(EvaluatorConfig config) Create a new instance.

Method Summary

Modifier and Type	Method and Description
EvalPayload	eval(long timestamp) Evaluate the expressions for all subscriptions against the data available for the provided timestamp.
EvalPayload	eval(long t, List<com.netflix.spectator.api.Measurement> ms) Helper function that evaluates the data for a given time after updating with the provided list of measurements.
void	sync(List<Subscription> subs) Synchronize the set of subscriptions for this evaluator with the provided set.
void	update(com.netflix.spectator.api.Id id, long t, double v) Update the state for the expressions to be evaluated with the provided datapoint.
void	update(com.netflix.spectator.api.Measurement m) Update the state.

Methods inherited from class java.lang.Object

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

Constructor Detail

Evaluator

public Evaluator(EvaluatorConfig config)

Create a new instance.

Parameters:

config - Config settings to tune the evaluation behavior.

Method Detail

sync

public void sync(List<Subscription> subs)

Synchronize the set of subscriptions for this evaluator with the provided set.

update

public void update(com.netflix.spectator.api.Measurement m)

Update the state. See update(Id, long, double) for more information.

update

public void update(com.netflix.spectator.api.Id id,
                   long t,
                   double v)

Update the state for the expressions to be evaluated with the provided datapoint.

Parameters:

id - Id for the datapoint. The value will be collected for each expression where the id satisfies the query constraints.

t - Timestamp for the datapoint. It should be on a boundary for the step interval.

v - Value for the datapoint.

eval

public EvalPayload eval(long timestamp)

Evaluate the expressions for all subscriptions against the data available for the provided timestamp. The data must be populated by calling update(Id, long, double) prior to performing the evaluation.

Parameters:

timestamp - Timestamp for the interval to evaluate.

Returns:

Payload representing the results of the evaluation.

eval

public EvalPayload eval(long t,
                        List<com.netflix.spectator.api.Measurement> ms)

Helper function that evaluates the data for a given time after updating with the provided list of measurements.

Parameters:

t - Timestamp for the interval to evaluate.

ms - List of measurements to include before performing the evaluation.

Returns:

Payload representing the results of the evaluation.