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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.AbstractMap.SimpleImmutableEntry;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;
import com.yahoo.collections.LazyMap;
import com.yahoo.collections.LazySet;
import java.util.logging.Level;
/**
* An aggregation of data which is only written to from a single thread.
*
* @author Steinar Knutsen
*/
public class Bucket {
private static final Logger log = Logger.getLogger(Bucket.class.getName());
private final Map<Identifier, UntypedMetric> values = LazyMap.newHashMap();
boolean gotTimeStamps;
long fromMillis;
long toMillis;
public Bucket() {
this.gotTimeStamps = false;
this.fromMillis = 0;
this.toMillis = 0;
}
public Bucket(long fromMillis, long toMillis) {
this.gotTimeStamps = true;
this.fromMillis = fromMillis;
this.toMillis = toMillis;
}
public Set<Map.Entry<Identifier, UntypedMetric>> entrySet() {
return values.entrySet();
}
void put(Sample x) {
UntypedMetric value = get(x);
Measurement m = x.getMeasurement();
switch (x.getMetricType()) {
case GAUGE:
value.put(m.getMagnitude());
break;
case COUNTER:
value.add(m.getMagnitude());
break;
default:
throw new IllegalArgumentException("Unsupported metric type: " + x.getMetricType());
}
}
void put(Identifier id, UntypedMetric value) {
values.put(id, value);
}
boolean hasIdentifier(Identifier id) {
return values.containsKey(id);
}
void merge(Bucket other, boolean otherIsNewer) {
LazySet<String> malformedMetrics = LazySet.newHashSet();
for (Map.Entry<Identifier, UntypedMetric> entry : other.values.entrySet()) {
String metricName = entry.getKey().getName();
try {
if (!malformedMetrics.contains(metricName)) {
get(entry.getKey(), entry.getValue()).merge(entry.getValue(), otherIsNewer);
}
} catch (IllegalArgumentException e) {
log.log(Level.WARNING, "Problems merging metric " + metricName + ", possibly ignoring data.");
// avoid spamming the log if there are a lot of mismatching
// threads
malformedMetrics.add(metricName);
}
}
}
void merge(Bucket other) {
boolean otherIsNewer = resolveTimeStamps(other);
merge(other, otherIsNewer);
}
private boolean resolveTimeStamps(Bucket other) {
boolean otherIsNewer = other.fromMillis > this.fromMillis;
if (! gotTimeStamps) {
fromMillis = other.fromMillis;
toMillis = other.toMillis;
gotTimeStamps = other.gotTimeStamps;
} else if (other.gotTimeStamps) {
fromMillis = Math.min(fromMillis, other.fromMillis);
toMillis = Math.max(toMillis, other.toMillis);
}
return otherIsNewer;
}
private UntypedMetric get(Sample sample) {
Identifier dim = sample.getIdentifier();
UntypedMetric v = values.get(dim);
if (v == null) {
// please keep inside guard, as sample.getHistogramDefinition(String) touches a volatile
v = new UntypedMetric(sample.getHistogramDefinition(dim.getName()));
values.put(dim, v);
}
return v;
}
private UntypedMetric get(Identifier dim, UntypedMetric other) {
UntypedMetric v = values.get(dim);
if (v == null) {
v = new UntypedMetric(other.getMetricDefinition());
values.put(dim, v);
}
return v;
}
public Collection<String> getAllMetricNames() {
Set<String> names = new HashSet<>();
for (Identifier id : values.keySet()) {
names.add(id.getName());
}
return names;
}
public Collection<Map.Entry<Point, UntypedMetric>> getValuesForMetric(String metricName) {
List<Map.Entry<Point, UntypedMetric>> singleMetric = new ArrayList<>();
for (Map.Entry<Identifier, UntypedMetric> entry : values.entrySet()) {
if (metricName.equals(entry.getKey().getName())) {
singleMetric.add(locationValuePair(entry));
}
}
return singleMetric;
}
public Map<Point, UntypedMetric> getMapForMetric(String metricName) {
Map<Point, UntypedMetric> result = new HashMap<>();
for (Map.Entry<Identifier, UntypedMetric> entry : values.entrySet()) {
if (metricName.equals(entry.getKey().getName())) {
result.put(entry.getKey().getLocation(), entry.getValue());
}
}
return result;
}
public Map<String, List<Map.Entry<Point, UntypedMetric>>> getValuesByMetricName() {
Map<String, List<Map.Entry<Point, UntypedMetric>>> result = new HashMap<>();
for (Map.Entry<Identifier, UntypedMetric> entry : values.entrySet()) {
List<Map.Entry<Point, UntypedMetric>> singleMetric;
if (result.containsKey(entry.getKey().getName())) {
singleMetric = result.get(entry.getKey().getName());
} else {
singleMetric = new ArrayList<>();
result.put(entry.getKey().getName(), singleMetric);
}
singleMetric.add(locationValuePair(entry));
}
return result;
}
private SimpleImmutableEntry<Point, UntypedMetric> locationValuePair(Map.Entry<Identifier, UntypedMetric> entry) {
return new SimpleImmutableEntry<>(entry.getKey().getLocation(), entry.getValue());
}
@Override
public String toString() {
return "Bucket [values=" + toString(values.entrySet(), 3) + "]";
}
private String toString(Collection<?> collection, int maxLen) {
StringBuilder builder = new StringBuilder();
builder.append("[");
int i = 0;
for (Iterator<?> iterator = collection.iterator(); iterator.hasNext() && i < maxLen; i++) {
if (i > 0) {
builder.append(", ");
}
builder.append(iterator.next());
}
builder.append("]");
return builder.toString();
}
/**
* This bucket contains data newer than approximately this point in time.
*/
public long getFromMillis() {
return fromMillis;
}
/**
* This bucket contains data older than approximately this point in time.
*/
public long getToMillis() {
return toMillis;
}
}
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