userver
C++ Async Framework
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options.hpp
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#
pragma
once
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/// @file userver/storages/clickhouse/options.hpp
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/// @brief Options
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#
include
<
chrono
>
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#
include
<
optional
>
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USERVER_NAMESPACE_BEGIN
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namespace
storages
::
clickhouse
{
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/// A structure to control timeouts for ClickHouse queries
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///
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/// There is a single parameter, `execute`, which limits the overall time
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/// the driver spends executing a query, which includes:
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/// * connecting to ClickHouse server, if there are no connections available and
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/// connection pool still has space for new connections;
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/// * waiting for a connection to become idle if there are no idle connections
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/// and connection pool already has reached its max size;
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/// * executing the statement;
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/// * waiting for all the results to arrive.
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///
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/// In case of a timeout the client gets an exception and the driver drops the
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/// connection (no further reuse will take place),
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/// otherwise the connection is returned to the pool.
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struct
CommandControl
final
{
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/// Overall timeout for a command being executed.
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std::chrono::milliseconds
execute
;
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explicit
constexpr
CommandControl(std::chrono::milliseconds execute) : execute{execute} {}
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};
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/// @brief storages::clickhouse::CommandControl that may not be set.
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using
OptionalCommandControl = std::optional<CommandControl>;
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}
// namespace storages::clickhouse
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USERVER_NAMESPACE_END
userver
storages
clickhouse
options.hpp
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