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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
#include <thread>
#include <vespa/vespalib/stllike/string.h>
#include "counter.h"
#include "gauge.h"
#include "current_samples.h"
#include "snapshots.h"
#include "point.h"
#include "point_builder.h"
#include "dimension.h"
#include "label.h"
namespace vespalib::metrics {
/**
* Interface for a Metrics manager, for creating metrics
* and for fetching snapshots.
**/
class MetricsManager
: public std::enable_shared_from_this<MetricsManager>
{
public:
virtual ~MetricsManager() {}
/**
* Get or create a counter metric.
* @param name the name of the metric.
**/
virtual Counter counter(const vespalib::string &name, const vespalib::string &description) = 0;
/**
* Get or create a gauge metric.
* @param name the name of the metric.
**/
virtual Gauge gauge(const vespalib::string &name, const vespalib::string &description) = 0;
/**
* Get or create a dimension for labeling metrics.
* @param name the name of the dimension.
**/
virtual Dimension dimension(const vespalib::string &name) = 0; // get or create
/**
* Get or create a label.
* @param value the label value.
**/
virtual Label label(const vespalib::string &value) = 0; // get or create
/**
* Create a PointBuilder for labeling metrics.
**/
PointBuilder pointBuilder() {
return PointBuilder(shared_from_this());
}
/**
* Create a PointBuilder for labeling metrics, starting with
* an Point of already existing dimension/label pairs, which can
* then be added to or changed.
* @param from provide a Point to start from.
*
**/
virtual PointBuilder pointBuilder(Point from) = 0;
/**
* Create a snapshot of sampled metrics (usually for the last minute).
**/
virtual Snapshot snapshot() = 0;
/**
* Create a snapshot of all sampled metrics the manager has seen.
**/
virtual Snapshot totalSnapshot() = 0;
// for use from PointBuilder only
virtual Point pointFrom(PointMap map) = 0;
// for use from Counter only
virtual void add(Counter::Increment inc) = 0;
// for use from Gauge only
virtual void sample(Gauge::Measurement value) = 0;
};
} // namespace vespalib::metrics
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