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74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
//
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// Copyright(c) 2015 Gabi Melman.
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// Distributed under the MIT License (http://opensource.org/licenses/MIT)
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//
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#pragma once
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// Very fast asynchronous logger (millions of logs per second on an average
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// desktop)
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// Uses pre allocated lockfree queue for maximum throughput even under large
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// number of threads.
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// Creates a single back thread to pop messages from the queue and log them.
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//
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// Upon each log write the logger:
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// 1. Checks if its log level is enough to log the message
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// 2. Push a new copy of the message to a queue (or block the caller until
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// space is available in the queue)
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// 3. will throw spdlog_ex upon log exceptions
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// Upon destruction, logs all remaining messages in the queue before
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// destructing..
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#include "spdlog/common.h"
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#include "spdlog/logger.h"
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#include <chrono>
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#include <memory>
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#include <string>
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namespace spdlog {
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// Async overflow policy - block by default.
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enum class async_overflow_policy
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{
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block, // Block until message can be enqueued
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overrun_oldest // Discard oldest message in the queue if full when trying to
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// add new item.
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};
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namespace details {
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class thread_pool;
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}
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class async_logger final : public std::enable_shared_from_this<async_logger>, public logger
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{
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friend class details::thread_pool;
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public:
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template<typename It>
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async_logger(std::string logger_name, It begin, It end, std::weak_ptr<details::thread_pool> tp,
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async_overflow_policy overflow_policy = async_overflow_policy::block);
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async_logger(std::string logger_name, sinks_init_list sinks_list, std::weak_ptr<details::thread_pool> tp,
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async_overflow_policy overflow_policy = async_overflow_policy::block);
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async_logger(std::string logger_name, sink_ptr single_sink, std::weak_ptr<details::thread_pool> tp,
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async_overflow_policy overflow_policy = async_overflow_policy::block);
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std::shared_ptr<logger> clone(std::string new_name) override;
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protected:
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void sink_it_(details::log_msg &msg) override;
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void flush_() override;
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void backend_log_(const details::log_msg &incoming_log_msg);
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void backend_flush_();
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private:
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std::weak_ptr<details::thread_pool> thread_pool_;
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async_overflow_policy overflow_policy_;
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};
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} // namespace spdlog
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#include "details/async_logger_impl.h"
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