13 #ifndef PQXX_H_PIPELINE
14 #define PQXX_H_PIPELINE
16 #if !defined(PQXX_HEADER_PRE)
17 # error "Include libpqxx headers as <pqxx/header>, not <pqxx/header.hxx>."
24 #include "pqxx/transaction_base.hxx"
84 query_id insert(std::string_view) &;
119 [[nodiscard]]
bool is_finished(query_id) const;
130 return retrieve(m_queries.find(qid)).second;
135 std::pair<query_id, result> retrieve();
137 [[nodiscard]]
bool empty() const noexcept {
return std::empty(m_queries); }
152 int retain(
int retain_max = 2) &;
159 struct PQXX_PRIVATE Query
161 explicit Query(std::string_view q) :
162 query{std::make_shared<std::string>(q)}
165 std::shared_ptr<std::string> query;
169 using QueryMap = std::map<query_id, Query>;
176 static constexpr query_id qid_limit() noexcept
182 return (std::numeric_limits<query_id>::max)();
186 PQXX_PRIVATE query_id generate_id();
188 bool have_pending() const noexcept
190 return m_issuedrange.second != m_issuedrange.first;
193 PQXX_PRIVATE
void issue();
196 void set_error_at(query_id qid) noexcept
204 [[noreturn]] PQXX_PRIVATE
void internal_error(std::string
const &err);
206 PQXX_PRIVATE
bool obtain_result(
bool expect_none =
false);
208 PQXX_PRIVATE
void obtain_dummy();
209 PQXX_PRIVATE
void get_further_available_results();
210 PQXX_PRIVATE
void check_end_results();
213 PQXX_PRIVATE
void receive_if_available();
216 PQXX_PRIVATE
void receive(pipeline::QueryMap::const_iterator stop);
217 std::pair<pipeline::query_id, result> retrieve(pipeline::QueryMap::iterator);
220 std::pair<QueryMap::iterator, QueryMap::iterator> m_issuedrange;
222 int m_num_waiting = 0;
226 bool m_dummy_pending =
false;
229 query_id m_error = qid_limit();
235 internal::encoding_group m_encoding;
237 static constexpr std::string_view s_classname{
"pipeline"};
The home of all libpqxx classes, functions, templates, etc.
Definition: array.hxx:33
Processes several queries in FIFO manner, optimized for high throughput.
Definition: pipeline.hxx:51
pipeline(transaction_base &t)
Start a pipeline.
Definition: pipeline.hxx:63
bool empty() const noexcept
Definition: pipeline.hxx:137
pipeline(transaction_base &t, std::string_view tname)
Start a pipeline. Assign it a name, for more helpful error messages.
Definition: pipeline.hxx:68
pipeline(pipeline &&)=delete
pipeline(pipeline const &)=delete
long query_id
Identifying numbers for queries.
Definition: pipeline.hxx:54
pipeline & operator=(pipeline &&)=delete
pipeline & operator=(pipeline const &)=delete
Result set containing data returned by a query or command.
Definition: result.hxx:73
Interface definition (and common code) for "transaction" classes.
Definition: transaction_base.hxx:88
Base class for things that monopolise a transaction's attention.
Definition: transaction_focus.hxx:29