message.hpp

#pragma once
 
#include <chrono>
#include <optional>
 
#include <userver/utils/fast_pimpl.hpp>
#include <userver/utils/span.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace kafka {
 
namespace impl {
 
class ConsumerImpl;
class MessageHolder;
 
}  // namespace impl
 
/// @brief Wrapper for polled message data access.
class Message final {
public:
    ~Message();
 
    Message(Message&&) noexcept;
    Message& operator=(Message&&) noexcept = delete;
 
    Message(const Message&) = delete;
    Message& operator=(const Message&) = delete;
 
    const std::string& GetTopic() const;
    std::string_view GetKey() const;
    std::string_view GetPayload() const;
    std::optional<std::chrono::milliseconds> GetTimestamp() const;
    int GetPartition() const;
    std::int64_t GetOffset() const;
 
private:
    friend class impl::ConsumerImpl;
 
    explicit Message(impl::MessageHolder&& message);
 
    struct MessageData;
    using DataStorage = utils::FastPimpl<MessageData, 72, 8>;
 
    DataStorage data_;
};
 
using MessageBatchView = utils::span<const Message>;
 
}  // namespace kafka
 
USERVER_NAMESPACE_END