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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include <cstddef>
#include <cstdint>
#include <ostream>
#include <unordered_map>
#include <utility>
#include "opentelemetry/common/timestamp.h"
#include "opentelemetry/metrics/async_instruments.h"
#include "opentelemetry/metrics/observer_result.h"
#include "opentelemetry/nostd/function_ref.h"
#include "opentelemetry/nostd/variant.h"
#include "opentelemetry/sdk/common/global_log_handler.h"
#include "opentelemetry/sdk/metrics/async_instruments.h"
#include "opentelemetry/sdk/metrics/multi_observer_result.h"
#include "opentelemetry/sdk/metrics/observer_result.h"
#include "opentelemetry/sdk/metrics/state/metric_storage.h"
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace metrics
{
namespace
{
struct StoreResultVisitor
{
void operator()(ObserverResultT<int64_t> &result) const
{
storage->RecordLong(result.GetMeasurements(), collection_ts);
}
void operator()(ObserverResultT<double> &result) const
{
storage->RecordDouble(result.GetMeasurements(), collection_ts);
}
void operator()(const nostd::monostate &) const {}
AsyncWritableMetricStorage *storage;
opentelemetry::common::SystemTimestamp collection_ts;
};
} // namespace
void MultiObserverResult::RegisterInstrument(
opentelemetry::metrics::ObservableInstrument *instrument)
{
observer_results_.emplace(instrument, nostd::monostate());
}
void MultiObserverResult::DeregisterInstrument(
opentelemetry::metrics::ObservableInstrument *instrument)
{
observer_results_.erase(instrument);
}
size_t MultiObserverResult::InstrumentCount() const
{
return observer_results_.size();
}
bool MultiObserverResult::HasInstrument(
const opentelemetry::metrics::ObservableInstrument *instrument) const
{
return observer_results_.find(const_cast<opentelemetry::metrics::ObservableInstrument *>(
instrument)) != observer_results_.end();
}
void MultiObserverResult::GetInstruments(
nostd::function_ref<void(opentelemetry::metrics::ObservableInstrument *)> callback)
{
for (auto &el : observer_results_)
{
callback(el.first);
}
}
void MultiObserverResult::Reset()
{
for (auto it = observer_results_.begin(); it != observer_results_.end(); ++it)
{
it->second = nostd::monostate();
}
}
void MultiObserverResult::StoreResults(opentelemetry::common::SystemTimestamp collection_ts)
{
for (auto &el : observer_results_)
{
auto *instrument = el.first;
auto &result = el.second;
auto storage = static_cast<opentelemetry::sdk::metrics::ObservableInstrument *>(instrument)
->GetMetricStorage();
nostd::visit(StoreResultVisitor{storage, collection_ts}, result);
}
}
opentelemetry::metrics::ObserverResultT<double> &MultiObserverResult::ForInstrumentDouble(
const opentelemetry::metrics::ObservableInstrument *instrument)
{
static opentelemetry::sdk::metrics::ObserverResultT<double> null_result;
// const_cast is appropriate here, because we're _not_ modifying the passed-in pointer;
// we just need to make it non-const to be able to look it up in our map.
auto it = observer_results_.find(
const_cast<opentelemetry::metrics::ObservableInstrument *>(instrument));
if (it == observer_results_.end())
{
OTEL_INTERNAL_LOG_ERROR("[MultiObserverResult::ForInstrumentDouble]"
<< "The instrument is not registered on with callback");
return null_result;
}
auto *inner = nostd::get_if<ObserverResultT<double>>(&it->second);
if (inner == nullptr)
{
return it->second.emplace<ObserverResultT<double>>();
}
else
{
return *inner;
}
}
opentelemetry::metrics::ObserverResultT<int64_t> &MultiObserverResult::ForInstrumentInt64(
const opentelemetry::metrics::ObservableInstrument *instrument)
{
static opentelemetry::sdk::metrics::ObserverResultT<int64_t> null_result;
auto it = observer_results_.find(
const_cast<opentelemetry::metrics::ObservableInstrument *>(instrument));
if (it == observer_results_.end())
{
OTEL_INTERNAL_LOG_ERROR("[MultiObserverResult::ForInstrumentInt64]"
<< "The instrument is not registered on with callback");
return null_result;
}
auto *inner = nostd::get_if<ObserverResultT<int64_t>>(&it->second);
if (inner == nullptr)
{
return it->second.emplace<ObserverResultT<int64_t>>();
}
else
{
return *inner;
}
}
} // namespace metrics
} // namespace sdk
OPENTELEMETRY_END_NAMESPACE
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