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package ai.vespa.hosted.cd.metric;
import java.util.HashMap;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.StringJoiner;
import static java.util.Map.copyOf;
/**
* Known statistic about a metric, at a certain point.
*
* @author jonmv
*/
public class Statistic {
private final Map<Type, Double> data;
/** Creates a new Statistic with a copy of the given data. */
private Statistic(Map<Type, Double> data) {
this.data = data;
}
public static Statistic of(Map<Type, Double> data) {
return new Statistic(copyOf(data));
}
/** Returns the value of the given type, or throws a NoSuchElementException if this isn't known. */
public double get(Type key) {
if ( ! data.containsKey(key))
throw new NoSuchElementException("No value with key '" + key + "' is known.");
return data.get(key);
}
/** Returns the underlying, unmodifiable Map. */
public Map<Type, Double> asMap() {
return data;
}
Statistic mergedWith(Statistic other) {
if (data.keySet().equals(other.data.keySet()))
throw new IllegalArgumentException("Incompatible key sets '" + data.keySet() + "' and '" + other.data.keySet() + "'.");
Map<Type, Double> merged = new HashMap<>();
double n1 = get(Type.count), n2 = other.get(Type.count);
for (Type type : data.keySet()) switch (type) {
case count: merged.put(type, n1 + n2); break;
case rate: merged.put(type, get(Type.rate) + other.get(Type.rate)); break;
case max: merged.put(type, Math.max(get(Type.max), other.get(Type.max))); break;
case min: merged.put(type, Math.min(get(Type.min), other.get(Type.min))); break;
case average: merged.put(type, (n1 * get(Type.average) + n2 * other.get(Type.average)) / (n1 + n2)); break;
case last:
case percentile95:
case percentile99: break;
default: throw new IllegalArgumentException("Unexpected type '" + type + "'.");
}
return of(merged);
}
@Override
public String toString() {
return new StringJoiner(", ", Statistic.class.getSimpleName() + "[", "]")
.add("data=" + data)
.toString();
}
}
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