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exporters/prometheus/include/opentelemetry/exporters/prometheus/collector.h
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| // Copyright The OpenTelemetry Authors | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
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| #pragma once | ||
| #ifndef ENABLE_METRICS_PREVIEW | ||
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| # include <memory> | ||
| # include <mutex> | ||
| # include <vector> | ||
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| # include <prometheus/collectable.h> | ||
| # include <prometheus/metric_family.h> | ||
| # include "opentelemetry/exporters/prometheus/exporter_utils.h" | ||
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| namespace prometheus_client = ::prometheus; | ||
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| OPENTELEMETRY_BEGIN_NAMESPACE | ||
| namespace exporter | ||
| { | ||
| namespace metrics | ||
| { | ||
| /** | ||
| * The Prometheus Collector maintains the intermediate collection in Prometheus Exporter | ||
| */ | ||
| class PrometheusCollector : public prometheus_client::Collectable | ||
| { | ||
| public: | ||
| /** | ||
| * Default Constructor. | ||
| * | ||
| * This constructor initializes the collection for metrics to export | ||
| * in this class with default capacity | ||
| */ | ||
| explicit PrometheusCollector(size_t max_collection_size = 2048); | ||
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| /** | ||
| * Collects all metrics data from metricsToCollect collection. | ||
| * | ||
| * @return all metrics in the metricsToCollect snapshot | ||
| */ | ||
| std::vector<prometheus_client::MetricFamily> Collect() const override; | ||
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| /** | ||
| * This function is called by export() function and add the collection of | ||
| * records to the metricsToCollect collection | ||
| * | ||
| * @param records a collection of records to add to the metricsToCollect collection | ||
| */ | ||
| void AddMetricData(const sdk::metrics::ResourceMetrics &data); | ||
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| /** | ||
| * Get the current collection in the collector. | ||
| * | ||
| * @return the current metricsToCollect collection | ||
| */ | ||
| std::vector<std::unique_ptr<sdk::metrics::ResourceMetrics>> &GetCollection(); | ||
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| /** | ||
| * Gets the maximum size of the collection. | ||
| * | ||
| * @return max collection size | ||
| */ | ||
| int GetMaxCollectionSize() const; | ||
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| private: | ||
| /** | ||
| * Collection of metrics data from the export() function, and to be export | ||
| * to user when they send a pull request. This collection is a pointer | ||
| * to a collection so Collect() is able to clear the collection, even | ||
| * though it is a const function. | ||
| */ | ||
| mutable std::vector<std::unique_ptr<sdk::metrics::ResourceMetrics>> metrics_to_collect_; | ||
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| /** | ||
| * Maximum size of the metricsToCollect collection. | ||
| */ | ||
| size_t max_collection_size_; | ||
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| /* | ||
| * Lock when operating the metricsToCollect collection | ||
| */ | ||
| mutable std::mutex collection_lock_; | ||
| }; | ||
| } // namespace metrics | ||
| } // namespace exporter | ||
| OPENTELEMETRY_END_NAMESPACE | ||
| #endif |
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