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+// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+// Fast asynchronous logger.
+// Uses pre allocated queue.
+// Creates a single back thread to pop messages from the queue and log them.
+//
+// Upon each log write the logger:
+// 1. Checks if its log level is enough to log the message
+// 2. Push a new copy of the message to a queue (or block the caller until
+// space is available in the queue)
+// Upon destruction, logs all remaining messages in the queue before
+// destructing..
+
+#include <spdlog/logger.h>
+
+namespace spdlog {
+
+// Async overflow policy - block by default.
+enum class async_overflow_policy
+{
+ block, // Block until message can be enqueued
+ overrun_oldest // Discard oldest message in the queue if full when trying to
+ // add new item.
+};
+
+namespace details {
+class thread_pool;
+}
+
+class SPDLOG_API async_logger final : public std::enable_shared_from_this<async_logger>, public logger
+{
+ friend class details::thread_pool;
+
+public:
+ template<typename It>
+ async_logger(std::string logger_name, It begin, It end, std::weak_ptr<details::thread_pool> tp,
+ async_overflow_policy overflow_policy = async_overflow_policy::block)
+ : logger(std::move(logger_name), begin, end)
+ , thread_pool_(std::move(tp))
+ , overflow_policy_(overflow_policy)
+ {}
+
+ async_logger(std::string logger_name, sinks_init_list sinks_list, std::weak_ptr<details::thread_pool> tp,
+ async_overflow_policy overflow_policy = async_overflow_policy::block);
+
+ async_logger(std::string logger_name, sink_ptr single_sink, std::weak_ptr<details::thread_pool> tp,
+ async_overflow_policy overflow_policy = async_overflow_policy::block);
+
+ std::shared_ptr<logger> clone(std::string new_name) override;
+
+protected:
+ void sink_it_(const details::log_msg &msg) override;
+ void flush_() override;
+ void backend_sink_it_(const details::log_msg &incoming_log_msg);
+ void backend_flush_();
+
+private:
+ std::weak_ptr<details::thread_pool> thread_pool_;
+ async_overflow_policy overflow_policy_;
+};
+} // namespace spdlog
+
+#ifdef SPDLOG_HEADER_ONLY
+#include "async_logger-inl.h"
+#endif