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package com.yahoo.vespa.tenant.cd.metrics;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.StringJoiner;
import static java.util.Map.copyOf;
import static java.util.stream.Collectors.toUnmodifiableMap;
/**
* A set of statistics for a metric, for points over a String-indexed space.
*
* @author jonmv
*/
public class Metric {
private final Map<Map<String, ?>, Statistic> statistics;
private Metric(Map<Map<String, ?>, Statistic> statistics) {
this.statistics = copyOf(statistics);
}
/** Creates a new Metric with a copy of the given data. */
public static Metric of(Map<Map<String, ?>, Statistic> data) {
if (data.isEmpty())
throw new IllegalArgumentException("No data given.");
Set<String> dimensions = data.keySet().iterator().next().keySet();
for (Map<String, ?> point : data.keySet()) {
if (point.keySet().contains(null))
throw new IllegalArgumentException("Dimensions may not be null: '" + point.keySet() + "'.");
if ( ! point.keySet().equals(dimensions))
throw new IllegalArgumentException("Given data has inconsistent dimensions: '" + dimensions + "' vs '" + point.keySet() + "'.");
if (point.values().contains(null))
throw new IllegalArgumentException("Position along a dimension may not be null: '" + point + "'.");
}
return new Metric(data);
}
/** Returns a Metric view of the subset of points in the given hyperplane; its dimensions must be a subset of those of this Metric. */
public Metric at(Map<String, ?> hyperplane) {
return new Metric(statistics.keySet().stream()
.filter(point -> point.entrySet().containsAll(hyperplane.entrySet()))
.collect(toUnmodifiableMap(point -> point, statistics::get)));
}
/** If this Metric contains a single point, returns the Statistic of that point; otherwise, throws an exception. */
public Statistic statistic() {
if (statistics.size() == 1)
return statistics.values().iterator().next();
if (statistics.isEmpty())
throw new NoSuchElementException("This Metric has no data.");
throw new IllegalStateException("This Metric has more than one point of data.");
}
/** Returns the underlying, unmodifiable Map. */
public Map<Map<String, ?>, Statistic> asMap() {
return statistics;
}
@Override
public String toString() {
return new StringJoiner(", ", Metric.class.getSimpleName() + "[", "]")
.add("statistics=" + statistics)
.toString();
}
}
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