{

public:

virtual ~SocketAdapter() = default;

virtual System::native_socket_type get_handle() const = 0;

virtual ::gnutls_session_t get_tls_session() const = 0;

virtual SocketAdapter *copy() const = 0;

virtual long nonblock_recv(std::vector<std::string::value_type> &buf, const std::chrono::milliseconds &timeout) const = 0;

virtual long nonblock_send(const std::string &buf, const std::chrono::milliseconds &timeout) const = 0;

virtual long nonblock_send(const std::vector<std::string::value_type> &buf, const size_t length, const std::chrono::milliseconds &timeout) const = 0;

virtual void close() = 0;

bool operator ==(const SocketAdapter &obj) const;

bool operator !=(const SocketAdapter &obj) const;