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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include <stddef.h>
#include <cassert>
#include <cstdint>
#include <limits>
#include <utility>
#include <vector>
#include "opentelemetry/nostd/variant.h"
#include "opentelemetry/sdk/metrics/data/circular_buffer.h"
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
namespace
{
struct AdaptingIntegerArrayIncrement
{
size_t index;
uint64_t count;
template <typename T>
uint64_t operator()(std::vector<T> &backing)
{
const uint64_t result = backing[index] + count;
if OPENTELEMETRY_LIKELY_CONDITION (result <= uint64_t(std::numeric_limits<T>::max()))
{
backing[index] = static_cast<T>(result);
return 0;
}
return result;
}
};
struct AdaptingIntegerArrayGet
{
size_t index;
template <typename T>
uint64_t operator()(const std::vector<T> &backing)
{
return backing[index];
}
};
struct AdaptingIntegerArraySize
{
template <typename T>
size_t operator()(const std::vector<T> &backing)
{
return backing.size();
}
};
struct AdaptingIntegerArrayClear
{
template <typename T>
void operator()(std::vector<T> &backing)
{
backing.assign(backing.size(), static_cast<T>(0));
}
};
struct AdaptingIntegerArrayCopy
{
template <class T1, class T2>
void operator()(const std::vector<T1> &from, std::vector<T2> &to)
{
for (size_t i = 0; i < from.size(); i++)
{
to[i] = static_cast<T2>(from[i]);
}
}
};
} // namespace
void AdaptingIntegerArray::Increment(size_t index, uint64_t count)
{
/* May or may not fit */
const uint64_t result = nostd::visit(AdaptingIntegerArrayIncrement{index, count}, backing_);
if OPENTELEMETRY_LIKELY_CONDITION (result == 0)
{
return;
}
EnlargeToFit(result);
/* Must fit, buffer was enlarged for the value to store */
OPENTELEMETRY_MAYBE_UNUSED const uint64_t result2 =
nostd::visit(AdaptingIntegerArrayIncrement{index, count}, backing_);
assert(result2 == 0);
}
uint64_t AdaptingIntegerArray::Get(size_t index) const
{
return nostd::visit(AdaptingIntegerArrayGet{index}, backing_);
}
size_t AdaptingIntegerArray::Size() const
{
return nostd::visit(AdaptingIntegerArraySize{}, backing_);
}
void AdaptingIntegerArray::Clear()
{
nostd::visit(AdaptingIntegerArrayClear{}, backing_);
}
void AdaptingIntegerArray::EnlargeToFit(uint64_t value)
{
const size_t backing_size = Size();
decltype(backing_) backing;
if (value <= std::numeric_limits<uint16_t>::max())
{
backing = std::vector<uint16_t>(backing_size, 0);
}
else if (value <= std::numeric_limits<uint32_t>::max())
{
backing = std::vector<uint32_t>(backing_size, 0);
}
else
{
backing = std::vector<uint64_t>(backing_size, 0);
}
nostd::visit(AdaptingIntegerArrayCopy{}, backing_, backing);
backing_ = std::move(backing);
}
void AdaptingCircularBufferCounter::Clear()
{
start_index_ = kNullIndex;
end_index_ = kNullIndex;
base_index_ = kNullIndex;
backing_.Clear();
}
bool AdaptingCircularBufferCounter::Increment(int32_t index, uint64_t delta)
{
if (Empty())
{
start_index_ = index;
end_index_ = index;
base_index_ = index;
backing_.Increment(0, delta);
return true;
}
if (index > end_index_)
{
// Move end, check max size.
if (index + 1 > static_cast<int32_t>(backing_.Size()) + start_index_)
{
return false;
}
end_index_ = index;
}
else if (index < start_index_)
{
// Move end, check max size.
if (end_index_ + 1 > static_cast<int32_t>(backing_.Size()) + index)
{
return false;
}
start_index_ = index;
}
backing_.Increment(ToBufferIndex(index), delta);
return true;
}
uint64_t AdaptingCircularBufferCounter::Get(int32_t index) const
{
if (index < start_index_ || index > end_index_)
{
return 0;
}
return backing_.Get(ToBufferIndex(index));
}
size_t AdaptingCircularBufferCounter::ToBufferIndex(int32_t index) const
{
// Figure out the index relative to the start of the circular buffer.
if (index < base_index_)
{
// If index is before the base one, wrap around.
return static_cast<size_t>(index + backing_.Size() - base_index_);
}
return static_cast<size_t>(index - base_index_);
}
} // namespace metrics
} // namespace sdk
OPENTELEMETRY_END_NAMESPACE
|
