dist_sink.h

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// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
#pragma once
 
#include "base_sink.h"
#include <spdlog/details/log_msg.h>
#include <spdlog/details/null_mutex.h>
#include <spdlog/pattern_formatter.h>
 
#include <algorithm>
#include <memory>
#include <mutex>
#include <vector>
 
// Distribution sink (mux). Stores a vector of sinks which get called when log
// is called
 
namespace spdlog
{
    namespace sinks
    {
 
        template <typename Mutex>
        class dist_sink : public base_sink<Mutex>
        {
        public:
            dist_sink() = default;
            explicit dist_sink(std::vector<std::shared_ptr<sink>> sinks)
                : sinks_(sinks)
            {
            }
 
            dist_sink(const dist_sink&)            = delete;
            dist_sink& operator=(const dist_sink&) = delete;
 
            void add_sink(std::shared_ptr<sink> sub_sink)
            {
                std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
                sinks_.push_back(sub_sink);
            }
 
            void remove_sink(std::shared_ptr<sink> sub_sink)
            {
                std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
                sinks_.erase(std::remove(sinks_.begin(), sinks_.end(), sub_sink), sinks_.end());
            }
 
            void set_sinks(std::vector<std::shared_ptr<sink>> sinks)
            {
                std::lock_guard<Mutex> lock(base_sink<Mutex>::mutex_);
                sinks_ = std::move(sinks);
            }
 
            std::vector<std::shared_ptr<sink>>& sinks()
            {
                return sinks_;
            }
 
        protected:
            void sink_it_(const details::log_msg& msg) override
            {
                for (auto& sub_sink : sinks_)
                {
                    if (sub_sink->should_log(msg.level))
                    {
                        sub_sink->log(msg);
                    }
                }
            }
 
            void flush_() override
            {
                for (auto& sub_sink : sinks_)
                {
                    sub_sink->flush();
                }
            }
 
            void set_pattern_(const std::string& pattern) override
            {
                set_formatter_(details::make_unique<spdlog::pattern_formatter>(pattern));
            }
 
            void set_formatter_(std::unique_ptr<spdlog::formatter> sink_formatter) override
            {
                base_sink<Mutex>::formatter_ = std::move(sink_formatter);
                for (auto& sub_sink : sinks_)
                {
                    sub_sink->set_formatter(base_sink<Mutex>::formatter_->clone());
                }
            }
            std::vector<std::shared_ptr<sink>> sinks_;
        };
 
        using dist_sink_mt = dist_sink<std::mutex>;
        using dist_sink_st = dist_sink<details::null_mutex>;
 
    } // namespace sinks
} // namespace spdlog