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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.container.jdisc.state;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;
/**
* A snapshot of the metrics of this system in a particular time interval.
*
* @author Simon Thoresen Hult
*/
public final class MetricSnapshot implements Iterable<Map.Entry<MetricDimensions, MetricSet>> {
private final Map<MetricDimensions, MetricSet> data;
private final long fromMillis;
private final long toMillis;
public MetricSnapshot(long from, long to, TimeUnit unit, Map<MetricDimensions, MetricSet> data) {
this.fromMillis = unit.toMillis(from);
this.toMillis = unit.toMillis(to);
this.data = data;
}
MetricSnapshot() {
this(0, 0, TimeUnit.MILLISECONDS, new HashMap<>());
}
MetricSnapshot(long from, long to, TimeUnit unit) {
this(from, to, unit, new HashMap<>());
}
private static MetricSnapshot createWithMetrics(Map<MetricDimensions, MetricSet> data) {
return new MetricSnapshot(0, 0, TimeUnit.MILLISECONDS, data);
}
public long getFromTime(TimeUnit unit) {
return unit.convert(fromMillis, TimeUnit.MILLISECONDS);
}
public long getToTime(TimeUnit unit) {
return unit.convert(toMillis, TimeUnit.MILLISECONDS);
}
/** Returns all the metrics in this snapshot. */
@Override
public Iterator<Map.Entry<MetricDimensions, MetricSet>> iterator() {
return data.entrySet().iterator();
}
void add(MetricDimensions dim, String key, Number val) {
metricSet(dim).add(key, val);
}
void set(MetricDimensions dim, String key, Number val) {
metricSet(dim).set(key, val);
}
void add(MetricSnapshot snapshot) {
for (Map.Entry<MetricDimensions, MetricSet> entry : snapshot) {
MetricSet metricSet = data.get(entry.getKey());
if (metricSet != null) {
metricSet.add(entry.getValue());
} else {
data.put(entry.getKey(), entry.getValue());
}
}
}
/** Returns a metric set from this snapshot for a given set of dimensions */
public MetricSet metricSet(MetricDimensions dim) {
MetricSet metricSet = data.get(dim);
if (metricSet == null) {
data.put(dim, metricSet = new MetricSet());
}
return metricSet;
}
/**
* Create a new snapshot instance where Gauge metrics are preserved
* with the last-values they have in this snapshot instance.
*/
public MetricSnapshot createSnapshot() {
Map<MetricDimensions, MetricSet> newData = new HashMap<>();
for (Map.Entry<MetricDimensions, MetricSet> entry : data.entrySet()) {
MetricSet newSet = entry.getValue().partialClone();
if ( ! newSet.isEmpty()) {
newData.put(entry.getKey(), newSet);
}
}
return createWithMetrics(newData);
}
}
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