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90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
/** Transaction focus: types which monopolise a transaction's attention.
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*
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* Copyright (c) 2000-2022, Jeroen T. Vermeulen.
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*
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* See COPYING for copyright license. If you did not receive a file called
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* COPYING with this source code, please notify the distributor of this
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* mistake, or contact the author.
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*/
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#ifndef PQXX_H_TRANSACTION_FOCUS
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#define PQXX_H_TRANSACTION_FOCUS
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#if !defined(PQXX_HEADER_PRE)
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# error "Include libpqxx headers as <pqxx/header>, not <pqxx/header.hxx>."
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#endif
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#include "pqxx/util.hxx"
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namespace pqxx
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{
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/// Base class for things that monopolise a transaction's attention.
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/** You probably won't need to use this class. But it can be useful to _know_
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* that a given libpqxx class is derived from it.
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*
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* Pipelines, SQL statements, and data streams are examples of classes derived
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* from `transaction_focus`. For any given transaction, only one object of
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* such a class can be active at any given time.
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*/
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class PQXX_LIBEXPORT transaction_focus
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{
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public:
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transaction_focus(
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transaction_base &t, std::string_view cname, std::string_view oname) :
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m_trans{t}, m_classname{cname}, m_name{oname}
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{}
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transaction_focus(
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transaction_base &t, std::string_view cname, std::string &&oname) :
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m_trans{t}, m_classname{cname}, m_name{std::move(oname)}
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{}
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transaction_focus(transaction_base &t, std::string_view cname) :
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m_trans{t}, m_classname{cname}
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{}
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transaction_focus() = delete;
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transaction_focus(transaction_focus const &) = delete;
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transaction_focus &operator=(transaction_focus const &) = delete;
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/// Class name, for human consumption.
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[[nodiscard]] constexpr std::string_view classname() const noexcept
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{
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return m_classname;
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}
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/// Name for this object, if the caller passed one; empty string otherwise.
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[[nodiscard]] std::string_view name() const &noexcept { return m_name; }
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[[nodiscard]] std::string description() const
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{
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return pqxx::internal::describe_object(m_classname, m_name);
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}
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/// Can't move a transaction_focus.
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/** Moving the transaction_focus would break the transaction's reference back
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* to the object.
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*/
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transaction_focus(transaction_focus &&) = delete;
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/// Can't move a transaction_focus.
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/** Moving the transaction_focus would break the transaction's reference back
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* to the object.
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*/
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transaction_focus &operator=(transaction_focus &&) = delete;
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protected:
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void register_me();
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void unregister_me() noexcept;
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void reg_pending_error(std::string const &) noexcept;
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bool registered() const noexcept { return m_registered; }
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transaction_base &m_trans;
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private:
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bool m_registered = false;
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std::string_view m_classname;
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std::string m_name;
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};
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} // namespace pqxx
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#endif
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