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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.dockerapi.metrics;
import com.google.inject.Inject;
import com.yahoo.metrics.simple.MetricReceiver;
import com.yahoo.metrics.simple.Point;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
/**
* Export metrics to both /state/v1/metrics and makes them available programmatically.
* Each metric belongs to a monitoring application
*
* @author freva
*/
public class MetricReceiverWrapper {
// Application names used
public static final String APPLICATION_DOCKER = "docker";
public static final String APPLICATION_HOST = "vespa.host";
public static final String APPLICATION_NODE = "vespa.node";
private final Object monitor = new Object();
private final Map<String, ApplicationMetrics> applicationMetrics = new HashMap<>(); // key is application name
private final MetricReceiver metricReceiver;
@Inject
public MetricReceiverWrapper(MetricReceiver metricReceiver) {
this.metricReceiver = metricReceiver;
}
/**
* Declaring the same dimensions and name results in the same CounterWrapper instance (idempotent).
*/
public CounterWrapper declareCounter(String application, Dimensions dimensions, String name) {
synchronized (monitor) {
Map<Dimensions, Map<String, MetricValue>> metricsByDimensions = getOrCreateApplicationMetrics(application);
if (!metricsByDimensions.containsKey(dimensions)) metricsByDimensions.put(dimensions, new HashMap<>());
if (!metricsByDimensions.get(dimensions).containsKey(name)) {
CounterWrapper counter = new CounterWrapper(metricReceiver.declareCounter(name, new Point(dimensions.dimensionsMap)));
metricsByDimensions.get(dimensions).put(name, counter);
}
return (CounterWrapper) metricsByDimensions.get(dimensions).get(name);
}
}
/**
* Declaring the same dimensions and name results in the same GaugeWrapper instance (idempotent).
*/
public GaugeWrapper declareGauge(String application, Dimensions dimensions, String name) {
synchronized (monitor) {
Map<Dimensions, Map<String, MetricValue>> metricsByDimensions = getOrCreateApplicationMetrics(application);
if (!metricsByDimensions.containsKey(dimensions))
metricsByDimensions.put(dimensions, new HashMap<>());
if (!metricsByDimensions.get(dimensions).containsKey(name)) {
GaugeWrapper gauge = new GaugeWrapper(metricReceiver.declareGauge(name, new Point(dimensions.dimensionsMap)));
metricsByDimensions.get(dimensions).put(name, gauge);
}
return (GaugeWrapper) metricsByDimensions.get(dimensions).get(name);
}
}
public List<DimensionMetrics> getAllMetrics() {
synchronized (monitor) {
List<DimensionMetrics> dimensionMetrics = new ArrayList<>();
applicationMetrics.forEach((application, applicationMetrics) -> applicationMetrics.metricsByDimensions().entrySet().stream()
.map(entry -> new DimensionMetrics(application, entry.getKey(),
entry.getValue().entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, value -> value.getValue().getValue()))))
.forEach(dimensionMetrics::add));
return dimensionMetrics;
}
}
// For testing, returns same as getAllMetrics(), but without "timestamp"
public Set<Map<String, Object>> getAllMetricsRaw() {
synchronized (monitor) {
Set<Map<String, Object>> dimensionMetrics = new HashSet<>();
applicationMetrics.forEach((application, applicationMetrics) -> applicationMetrics.metricsByDimensions().entrySet().stream()
.map(entry -> new DimensionMetrics(application, entry.getKey(),
entry.getValue().entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, value -> value.getValue().getValue()))))
.map(DimensionMetrics::getMetrics)
.forEach(dimensionMetrics::add));
return dimensionMetrics;
}
}
// For testing
Map<String, Number> getMetricsForDimension(String application, Dimensions dimensions) {
synchronized (monitor) {
Map<Dimensions, Map<String, MetricValue>> metricsByDimensions = getOrCreateApplicationMetrics(application);
return metricsByDimensions.get(dimensions).entrySet().stream().collect(
Collectors.toMap(Map.Entry::getKey, entry -> entry.getValue().getValue()));
}
}
private Map<Dimensions, Map<String, MetricValue>> getOrCreateApplicationMetrics(String application) {
if (! applicationMetrics.containsKey(application)) {
ApplicationMetrics metrics = new ApplicationMetrics();
applicationMetrics.put(application, metrics);
}
return applicationMetrics.get(application).metricsByDimensions();
}
// "Application" is the monitoring application, not Vespa application
private static class ApplicationMetrics {
private final Map<Dimensions, Map<String, MetricValue>> metricsByDimensions = new LinkedHashMap<>();
Map<Dimensions, Map<String, MetricValue>> metricsByDimensions() {
return metricsByDimensions;
}
}
}
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