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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.metrics.simple;
import java.util.ArrayList;
import java.util.Collections;
import com.yahoo.api.annotations.Beta;
/**
* Single-use builder for the immutable Point instances used to set dimensions
* for a metric. Get a fresh instance either from a corresponding Gauge or Counter,
* or through the MetricReceiver API.
*
* @author steinar
*/
@Beta
public final class PointBuilder {
private ArrayList<String> dimensions;
private ArrayList<Value> location;
public enum Discriminator {
LONG, DOUBLE, STRING;
}
PointBuilder() {
this(null);
}
PointBuilder(Point p) {
if (p != null) {
int size = p.dimensionality();
dimensions = new ArrayList<>(size+2);
location = new ArrayList<>(size+2);
Collections.addAll(dimensions, p.getDimensions());
Collections.addAll(location, p.getLocation());
} else {
dimensions = new ArrayList<>(4);
location = new ArrayList<>(4);
}
}
/**
* Set a named dimension to an integer value.
*
* @param dimensionName the name of the dimension to set
* @param dimensionValue to value for the given dimension
* @return this, to facilitate chaining
*/
public PointBuilder set(String dimensionName, long dimensionValue) {
return set(dimensionName, Value.of(dimensionValue));
}
/**
* Set a named dimension to a floating point value.
*
* @param dimensionName the name of the dimension to set
* @param dimensionValue to value for the given dimension
* @return this, to facilitate chaining
*/
public PointBuilder set(String dimensionName, double dimensionValue) {
return set(dimensionName, Value.of(dimensionValue));
}
/**
* Set a named dimension to a string value.
*
* @param dimensionName the name of the dimension to set
* @param dimensionValue to value for the given dimension
* @return this, to facilitate chaining
*/
public PointBuilder set(String dimensionName, String dimensionValue) {
return set(dimensionName, Value.of(dimensionValue));
}
private PointBuilder set(String axisName, Value w) {
// handle setting same axis multiple times nicely
int i = Collections.binarySearch(dimensions, axisName);
if (i < 0) {
dimensions.add(~i, axisName);
location.add(~i, w);
} else {
// only set location, dim obviously exists
location.set(i, w);
}
return this;
}
/**
* Create a new Point instance using the settings stored in this
* PointBuilder. PointBuilder instances cannot be re-used after build() has
* been invoked.
*
* @return a Point instance reflecting this builder
*/
public Point build() {
Point p = Point.emptyPoint();
int size = dimensions.size();
if (size != 0) {
p = new Point(dimensions.toArray(new String[size]), location.toArray(new Value[size]));
}
// deny builder re-use
dimensions = null;
location = null;
return p;
}
@Override
public String toString() {
final int maxLen = 3;
StringBuilder builder = new StringBuilder();
builder.append("PointBuilder [dimensions=")
.append(dimensions != null ? dimensions.subList(0, Math.min(dimensions.size(), maxLen)) : null)
.append(", location=").append(location != null ? location.subList(0, Math.min(location.size(), maxLen)) : null)
.append("]");
return builder.toString();
}
}
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