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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.metrics.set;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* Helper class to model a metric.
*
* @author trygve
* @author gjoranv
*/
public class Metric {
public final String name;
public final String outputName;
public final String description;
public final Map<String, String> dimensions;
public Metric(String name, String outputName, String description, Map<String, String> dimensions) {
this.name = name;
this.outputName = outputName;
this.description = description;
this.dimensions = Map.copyOf(dimensions);
}
public Metric(String name, String outputName, String description) {
this(name, outputName, description, new LinkedHashMap<>());
}
/**
* Creates a metric with empty description
*/
public Metric(String name, String outputName) {
this(name, outputName, "");
}
/**
* Creates a metric with same outputname as metricname
*
* @param name The name of the metric, same name used for output name
*/
public Metric(String name) {
this(name, name);
}
/**
* Returns a new Metric that is a combination of this and the given metric.
* New dimensions from the given metric are added, but already existing
* dimensions will be kept unchanged.
*
* @param other The metric to add dimensions from.
* @return A new metric with dimensions from this and the other.
*/
public Metric addDimensionsFrom(Metric other) {
Map<String, String> combined = new LinkedHashMap<>(dimensions);
other.dimensions.forEach(
(k, v) -> {
if (!combined.containsKey(k)) combined.put(k, v);
});
return new Metric(name, outputName, description, combined);
}
@Override
public String toString() {
return "Metric{" +
"name='" + name + '\'' +
", outputName='" + outputName + '\'' +
", dimensions=" + dimensions +
'}';
}
/**
* Two metrics are considered equal if they have the same name.
*/
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Metric metric = (Metric) o;
return name.equals(metric.name);
}
@Override
public int hashCode() {
return name.hashCode();
}
}
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