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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <memory>
#include "metric_id.h"
#include "point.h"
namespace vespalib {
namespace metrics {
class MetricsManager;
struct CounterAggregator;
/**
* Represents a counter metric that can be incremented.
**/
class Counter {
std::shared_ptr<MetricsManager> _manager;
MetricId _id;
public:
Counter() : _manager(), _id(0) {}
Counter(const Counter&) = delete;
Counter(Counter &&other) = default;
Counter& operator= (const Counter &) = delete;
Counter& operator= (Counter &&other) = default;
Counter(std::shared_ptr<MetricsManager> m, MetricId id)
: _manager(std::move(m)), _id(id)
{}
// convenience methods:
void add() const { add(1, Point::empty); }
void add(Point p) { add(1, p); }
void add(size_t count) const { add(count, Point::empty); }
/**
* Increment the counter.
* @param count the amount to increment by (default 1)
* @param p the point representing labels for this increment (default empty)
**/
void add(size_t count, Point p) const;
// internal
struct Increment {
using Key = std::pair<MetricId, Point>;
Key idx;
size_t value;
Increment() = delete;
Increment(Key k, size_t v) : idx(k), value(v) {}
};
typedef CounterAggregator aggregator_type;
typedef Increment sample_type;
};
} // namespace vespalib::metrics
} // namespace vespalib
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