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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.node.admin.container.metrics;
import com.google.inject.Inject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;
/**
* Stores the latest metric for the given application, name, dimension triplet in memory
*
* @author freva
*/
public class Metrics {
// Application names used
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<DimensionType, Map<String, ApplicationMetrics>> metrics = new HashMap<>();
@Inject
public Metrics() { }
/**
* Creates a counter metric under vespa.host application, with no dimensions and default dimension type
* See {@link #declareCounter(String, String, Dimensions, DimensionType)}
*/
public Counter declareCounter(String name) {
return declareCounter(name, Dimensions.NONE);
}
/**
* Creates a counter metric under vespa.host application, with the given dimensions and default dimension type
* See {@link #declareCounter(String, String, Dimensions, DimensionType)}
*/
public Counter declareCounter(String name, Dimensions dimensions) {
return declareCounter(APPLICATION_HOST, name, dimensions, DimensionType.DEFAULT);
}
/** Creates a counter metric. This method is idempotent. */
public Counter declareCounter(String application, String name, Dimensions dimensions, DimensionType type) {
synchronized (monitor) {
return (Counter) getOrCreateApplicationMetrics(application, type)
.computeIfAbsent(dimensions, d -> new HashMap<>())
.computeIfAbsent(name, n -> new Counter());
}
}
/**
* Creates a gauge metric under vespa.host application, with no dimensions and default dimension type
* See {@link #declareGauge(String, String, Dimensions, DimensionType)}
*/
public Gauge declareGauge(String name) {
return declareGauge(name, Dimensions.NONE);
}
/**
* Creates a gauge metric under vespa.host application, with the given dimensions and default dimension type
* See {@link #declareGauge(String, String, Dimensions, DimensionType)}
*/
public Gauge declareGauge(String name, Dimensions dimensions) {
return declareGauge(APPLICATION_HOST, name, dimensions, DimensionType.DEFAULT);
}
/** Creates a gauge metric. This method is idempotent */
public Gauge declareGauge(String application, String name, Dimensions dimensions, DimensionType type) {
synchronized (monitor) {
return (Gauge) getOrCreateApplicationMetrics(application, type)
.computeIfAbsent(dimensions, d -> new HashMap<>())
.computeIfAbsent(name, n -> new Gauge());
}
}
public List<DimensionMetrics> getDefaultMetrics() {
return getMetricsByType(DimensionType.DEFAULT);
}
public List<DimensionMetrics> getMetricsByType(DimensionType type) {
synchronized (monitor) {
List<DimensionMetrics> dimensionMetrics = new ArrayList<>();
metrics.getOrDefault(type, Map.of())
.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;
}
}
public void deleteMetricByDimension(String name, Dimensions dimensionsToRemove, DimensionType type) {
synchronized (monitor) {
Optional.ofNullable(metrics.get(type))
.map(m -> m.get(name))
.map(ApplicationMetrics::metricsByDimensions)
.ifPresent(m -> m.remove(dimensionsToRemove));
}
}
Map<Dimensions, Map<String, MetricValue>> getOrCreateApplicationMetrics(String application, DimensionType type) {
return metrics.computeIfAbsent(type, m -> new HashMap<>())
.computeIfAbsent(application, app -> new ApplicationMetrics())
.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;
}
}
// Used to distinguish whether metrics have been populated with all tag vaules
public enum DimensionType {
/** Default metrics get added default dimensions set in check config */
DEFAULT,
/** Pretagged metrics will only get the dimensions explicitly set when creating the counter/gauge */
PRETAGGED
}
}
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