mysql_audit_print_service_double_data_source.h

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/* Copyright (c) 2022, 2024, Oracle and/or its affiliates.
 
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#ifndef MYSQL_AUDIT_PRINT_SERVICE_DOUBLE_DATA_SOURCE_H
#define MYSQL_AUDIT_PRINT_SERVICE_DOUBLE_DATA_SOURCE_H
 
#include <mysql/components/service.h>
#include <mysql/components/services/bits/thd.h>
#include <mysql/components/services/mysql_string.h>
 
/**
  @ingroup group_components_services_inventory
 
  Audit print service allows to obtain data of the double type associated with
  the THD object, which keeps various data of the user session. It also allows
  to obtain data not necessarily bound with the user session.
 
  Currently, following data is supported:
 
  - Query time     ("query_time")     Query execution time [seconds].
  - Rows sent      ("rows_sent")      Row count sent to the client as a result.
  - Rows examined  ("rows_examined")  Row count accessed during the query.
  - Bytes received ("bytes_received") Byte count received from the client.
  - Bytes sent     ("bytes_sent")     Byte count sent to the client.
 
  @section double_service_init Initialization
 
  The service can be instantiated using the registry service with the
  "mysql_audit_print_service_double_data_source" name.
 
  @code
  SERVICE_TYPE(registry) *registry = mysql_plugin_registry_acquire();
  my_service<SERVICE_TYPE(mysql_audit_print_service_double_data_source)>
  svc("mysql_audit_print_service_double_data_source", registry);
  if (svc.is_valid()) {
    // The service is ready to be used
  }
  @endcode
 
  @section double_service_query_time Query Time
 
  Query Time represents query execution time in seconds.
 
  @code
  double value;
 
  svc->get(m_thd, "query_time", &value);
  @endcode
*/
BEGIN_SERVICE_DEFINITION(mysql_audit_print_service_double_data_source)
 
/**
  Get data value.
 
  @param      thd   Session THD object.
  @param      name  Name of the data value to be retrieved.
  @param[out] out   Out value pointer. Must not be nullptr.
 
  @return
    @retval FALSE Succeeded.
    @retval TRUE  Failed.
*/
DECLARE_BOOL_METHOD(get, (MYSQL_THD thd, my_h_string name, double *out));
 
END_SERVICE_DEFINITION(mysql_audit_print_service_double_data_source)
 
#endif /* MYSQL_AUDIT_PRINT_SERVICE_DOUBLE_DATA_SOURCE_H */