group_replication_flow_control_metrics_service.h

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/* Copyright (c) 2024, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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#ifndef GROUP_REPLICATION_FLOW_CONTROL_METRICS_SERVICE_H
#define GROUP_REPLICATION_FLOW_CONTROL_METRICS_SERVICE_H
 
#include <mysql/components/service.h>
#include <stddef.h>
 
/**
  @ingroup group_components_services_inventory
 
  A service that retrieve extra flow control stats from a member.
 
  This only works if the component is on a server with group replication
  running.
 
  @code
  SERVICE_TYPE(registry) *plugin_registry = mysql_plugin_registry_acquire();
  my_service<SERVICE_TYPE(group_replication_flow_control_metrics_service)> svc(
      "group_replication_message_service_send", plugin_registry);
 
  uint64_t value;
  if (svc.is_valid()) {
    bool error = svc->gr_flow_control_throttle_count(&value);
  }
  @endcode
*/
BEGIN_SERVICE_DEFINITION(group_replication_flow_control_metrics_service)
 
/**
  This function SHALL be called whenever the caller wants to
  read number of throttled transactions on this server since Group Replication
  start.
 
  @param[out] counts            number of transactions throttled
 
  @return false success, true on failure. Failure can happen if not able to
  read values from Group Replication metrics.
*/
DECLARE_BOOL_METHOD(get_throttle_count, (uint64_t * counts));
 
/**
  This function SHALL be called whenever the caller wants to
  read sum of time of throttled transactions on this server since Group
  Replication start.
 
  @param[out] time_sum          time in microseconds of transactions throttled
 
  @return false success, true on failure. Failure can happen if not able to
  read values from Group Replication metrics.
*/
DECLARE_BOOL_METHOD(get_throttle_time_sum, (uint64_t * time_sum));
 
/**
  This function SHALL be called whenever the caller wants to
  read number of active throttled transactions on this server.
 
  @param[out] active_count      number of active transactions being throttled
 
  @return false success, true on failure. Failure can happen if not able to
  read values from Group Replication metrics.
*/
DECLARE_BOOL_METHOD(get_throttle_active_count, (uint64_t * active_count));
 
/**
  This function SHALL be called whenever the caller wants to
  read timestamp last transaction was throttled on this server since Group
  Replication start.
 
  @param[out] timestamp              string representation of date. Buffer
                                     shall be bigger than
                                     MAX_DATE_STRING_REP_LENGTH.
 
  @return false success, true on failure. Failure can happen if not able to
  read values from Group Replication metrics.
*/
DECLARE_BOOL_METHOD(get_throttle_last_throttle_timestamp, (char *timestamp));
 
END_SERVICE_DEFINITION(group_replication_flow_control_metrics_service)
 
#endif /* GROUP_REPLICATION_FLOW_CONTROL_METRICS_SERVICE_H */