context_index.hpp

#pragma once
 
#include <chrono>
#include <mutex>
#include <string>
#include <vector>
 
#include <boost/json.hpp>
 
namespace launchdarkly::client_side::flag_manager {
 
class ContextIndex {
   public:
    struct IndexEntry {
        IndexEntry() = default;
        IndexEntry(
            std::string id,
            std::chrono::time_point<std::chrono::system_clock> timestamp);
        std::string id;
        std::chrono::time_point<std::chrono::system_clock> timestamp;
    };
 
    using Index = std::vector<IndexEntry>;
    ContextIndex() = default;
    explicit ContextIndex(Index);
 
    void Notice(std::string id,
                std::chrono::time_point<std::chrono::system_clock> timestamp);
 
    [[nodiscard]] Index const& Entries() const;
 
    std::vector<std::string> Prune(std::size_t maxContexts);
 
   private:
    Index index_;
};
 
void tag_invoke(boost::json::value_from_tag const& unused,
                boost::json::value& json_value,
                ContextIndex const& index);
 
ContextIndex tag_invoke(boost::json::value_to_tag<ContextIndex> const& unused,
                        boost::json::value const& json_value);
}  // namespace launchdarkly::client_side::flag_manager