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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.metrics.simple;
import com.yahoo.api.annotations.Beta;
import com.yahoo.metrics.simple.UntypedMetric.AssumedType;
/**
* A gauge metric, i.e. a bucket of arbitrary sample values. Create a gauge
* metric by declaring it with {@link MetricReceiver#declareGauge(String)} or
* {@link MetricReceiver#declareGauge(String, Point)}.
*
* @author steinar
*/
@Beta
public class Gauge {
private final Point defaultPosition;
private final String name;
private final MetricReceiver receiver;
Gauge(String name, Point defaultPosition, MetricReceiver receiver) {
this.name = name;
this.defaultPosition = defaultPosition;
this.receiver = receiver;
}
/**
* Record a sample with default or no position.
*
* @param x
* sample value
*/
public void sample(double x) {
sample(x, defaultPosition);
}
/**
* Record a sample at the given position.
*
* @param x
* sample value
* @param p
* position/dimension values for the sample
*/
public void sample(double x, Point p) {
receiver.update(new Sample(new Measurement(Double.valueOf(x)), new Identifier(name, p), AssumedType.GAUGE));
}
/**
* Create a PointBuilder with the default dimension values reflecting those
* given when this gauge was declared.
*
* @return a builder initialized with defaults from this metric instance
*/
public PointBuilder builder() {
return new PointBuilder(defaultPosition);
}
}
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