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80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
//
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// ThreadPoolCollector.h
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//
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// Library: Prometheus
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// Package: Collectors
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// Module: ThreadPoolCollector
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//
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// Definition of the ThreadPoolCollector class.
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//
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// Copyright (c) 2022, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Prometheus_ThreadPoolCollector_INCLUDED
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#define Prometheus_ThreadPoolCollector_INCLUDED
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#include "Poco/Prometheus/Collector.h"
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#include "Poco/Prometheus/CallbackMetric.h"
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#include "Poco/ThreadPool.h"
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#include <memory>
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#include <vector>
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namespace Poco {
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namespace Prometheus {
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class Prometheus_API ThreadPoolCollector: public Collector
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/// This Collector provides Poco::ThreadPool specific metrics:
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/// - poco_threadpool_max_threads: Maximum number of threads available in the thread pool (capacity).
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/// - poco_threadpool_used_threads: Number of currently used threads.
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/// - poco_threadpool_allocated_threads: Number of currently allocated threads.
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///
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/// Metrics have a single label "name" identifying the thread pool.
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/// The name of the default thread pool is "default".
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{
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public:
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ThreadPoolCollector();
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/// Creates a default ThreadPoolCollector for the default Poco::ThreadPool.
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explicit ThreadPoolCollector(const Poco::ThreadPool& threadPool);
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/// Creates a default ThreadPoolCollector for the given Poco::ThreadPool.
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/// The Poco::ThreadPool must have a non-empty name and the name must
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/// be unique across all ThreadPoolCollector instances.
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ThreadPoolCollector(const std::string& name, const Poco::ThreadPool& threadPool, Registry* pRegistry);
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/// Creates a custom ThreadPoolCollector with the given name
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/// and registers it with the given Registry.
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~ThreadPoolCollector() = default;
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/// Destroys the ThreadPoolCollector.
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// Collector
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void exportTo(Exporter& exporter) const override;
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/// Writes the given Metric to the Exporter.
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protected:
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void buildMetrics();
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static std::string collectorName(const std::string& threadPoolName);
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static const std::string NAME_PREFIX;
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private:
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using MetricPtr = std::unique_ptr<CallbackIntGauge>;
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const std::string _threadPoolName;
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const Poco::ThreadPool& _threadPool;
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std::vector<MetricPtr> _metrics;
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};
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} } // namespace Poco::Prometheus
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#endif // Prometheus_ThreadPoolCollector_INCLUDED
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