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88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
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//
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// Copyright(c) 2018 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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//
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// Async logging using global thread pool
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// All loggers created here share same global thread pool.
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// Each log message is pushed to a queue along withe a shared pointer to the
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// logger.
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// If a logger deleted while having pending messages in the queue, it's actual
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// destruction will defer
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// until all its messages are processed by the thread pool.
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// This is because each message in the queue holds a shared_ptr to the
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// originating logger.
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#include "spdlog/async_logger.h"
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#include "spdlog/details/registry.h"
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#include "spdlog/details/thread_pool.h"
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#include <memory>
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#include <mutex>
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namespace spdlog {
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namespace details {
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static const size_t default_async_q_size = 8192;
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}
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// async logger factory - creates async loggers backed with thread pool.
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// if a global thread pool doesn't already exist, create it with default queue
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// size of 8192 items and single thread.
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template<async_overflow_policy OverflowPolicy = async_overflow_policy::block>
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struct async_factory_impl
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{
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template<typename Sink, typename... SinkArgs>
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static std::shared_ptr<async_logger> create(std::string logger_name, SinkArgs &&... args)
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{
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auto ®istry_inst = details::registry::instance();
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// create global thread pool if not already exists..
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std::lock_guard<std::recursive_mutex> tp_lock(registry_inst.tp_mutex());
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auto tp = registry_inst.get_tp();
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if (tp == nullptr)
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{
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tp = std::make_shared<details::thread_pool>(details::default_async_q_size, 1);
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registry_inst.set_tp(tp);
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}
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auto sink = std::make_shared<Sink>(std::forward<SinkArgs>(args)...);
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auto new_logger = std::make_shared<async_logger>(std::move(logger_name), std::move(sink), std::move(tp), OverflowPolicy);
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registry_inst.initialize_logger(new_logger);
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return new_logger;
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}
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};
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using async_factory = async_factory_impl<async_overflow_policy::block>;
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using async_factory_nonblock = async_factory_impl<async_overflow_policy::overrun_oldest>;
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template<typename Sink, typename... SinkArgs>
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inline std::shared_ptr<spdlog::logger> create_async(std::string logger_name, SinkArgs &&... sink_args)
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{
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return async_factory::create<Sink>(std::move(logger_name), std::forward<SinkArgs>(sink_args)...);
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}
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template<typename Sink, typename... SinkArgs>
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inline std::shared_ptr<spdlog::logger> create_async_nb(std::string logger_name, SinkArgs &&... sink_args)
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{
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return async_factory_nonblock::create<Sink>(std::move(logger_name), std::forward<SinkArgs>(sink_args)...);
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}
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// set global thread pool.
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inline void init_thread_pool(size_t q_size, size_t thread_count)
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{
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auto tp = std::make_shared<details::thread_pool>(q_size, thread_count);
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details::registry::instance().set_tp(std::move(tp));
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}
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// get the global thread pool.
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inline std::shared_ptr<spdlog::details::thread_pool> thread_pool()
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{
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return details::registry::instance().get_tp();
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}
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} // namespace spdlog
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