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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* \file loadmetric.h
* \ingroup metrics
*
* \brief Utility class for creating metrics for all load types.
*
* To better see how different load types behave in the system we want to log
* separate metrics for various loadtypes. To make it easy to create and use
* such metrics, this class is a wrapper class that sets up one metric per load
* type.
*
* In order to make it easy to use load metrics, they are templated on the type,
* such that you get the correct type out of operator[]. Load metric needs to
* clone metrics on creation though, so if you want load metrics of a metric set
* you need to properly implement clone() for that set.
*/
#pragma once
#include "loadtype.h"
#include "metricset.h"
#include "summetric.h"
#include <vespa/vespalib/stllike/hash_map.h>
namespace metrics {
template<typename MetricType>
class LoadMetric : public MetricSet {
std::vector<Metric::UP> _ownerList;
using MetricTypeUP = std::unique_ptr<MetricType>;
using MetricMap = vespalib::hash_map<uint32_t, MetricTypeUP>;
MetricMap _metrics;
SumMetric<MetricType> _sum;
public:
/**
* Create a load metric using the given metric as a template to how they
* shuold look. They will get prefix names based on load types existing.
*/
LoadMetric(const LoadTypeSet& loadTypes, const MetricType& metric, MetricSet* owner = 0);
/**
* A load metric implements a copy constructor and a clone functions that
* clone content, and resetting name/tags/description, just so metric
* implementors can implement clone() by using regular construction and
* then assign the values to the new set. (Without screwing up copying as
* the load metric alters this data in supplied metric)
*/
LoadMetric(const LoadMetric<MetricType>& other, MetricSet* owner);
~LoadMetric();
MetricSet* clone(std::vector<Metric::UP> &ownerList,
CopyType copyType, MetricSet* owner,
bool includeUnused = false) const override;
MetricType& operator[](const LoadType& type) { return getMetric(type); }
const MetricType& operator[](const LoadType& type) const
{ return const_cast<LoadMetric<MetricType>*>(this)->getMetric(type); }
MetricType& getMetric(const LoadType& type);
void addMemoryUsage(MemoryConsumption& mc) const override;
};
} // metrics
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