event_tracking_query_consumer_helper.h

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/* Copyright (c) 2022, 2025, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
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   the program or referenced in the documentation.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef EVENT_TRACKING_QUERY_CONSUMER_HELPER_H
#define EVENT_TRACKING_QUERY_CONSUMER_HELPER_H
 
#include "mysql/components/component_implementation.h"
#include "mysql/components/service_implementation.h"
#include "mysql/components/services/event_tracking_query_service.h"
 
/**
  @file event_tracking_query_consumer_helper.h
  Helper file to create query event consumer
*/
 
// clang-format off
/**
  @anchor EVENT_TRACKING_QUERY_CONSUMER_EXAMPLE
 
  @code
 
  #include "mysql/components/util/event_tracking_query_consumer_helper.h"
 
  namespace Event_tracking_implementation {
 
  // Replace following with union of subevents to be filtered
  mysql_event_tracking_query_subclass_t
    Event_tracking_query_implementation::filtered_sub_events = 0;
 
  bool Event_tracking_query_implementation::callback(
      const mysql_event_tracking_query_data *data [[maybe_unused]]) {
      // Your code goes here
  }
  }  // namespace Event_tracking_implementation
 
  // Define init/deinit methods for component
 
  // Component declaration related stuff
 
  IMPLEMENTS_SERVICE_EVENT_TRACKING_QUERY(<implementation_name>);
 
  BEGIN_COMPONENT_PROVIDES(<component_name>)
  PROVIDES_SERVICE_EVENT_TRACKING_QUERY(<implementation_name>)
  END_COMPONENT_PROVIDES()
 
  // Rest of the component declaration code
 
  @endcode
*/
// clang-format on
 
#define PROVIDES_SERVICE_EVENT_TRACKING_QUERY(component) \
  PROVIDES_SERVICE(component, event_tracking_query)
 
#define IMPLEMENTS_SERVICE_EVENT_TRACKING_QUERY(component)                   \
  BEGIN_SERVICE_IMPLEMENTATION(component, event_tracking_query)              \
  Event_tracking_implementation::Event_tracking_query_implementation::notify \
  END_SERVICE_IMPLEMENTATION()
 
namespace Event_tracking_implementation {
/** Implementation helper class for query events. */
class Event_tracking_query_implementation {
 public:
  /** Sub-events to be filtered/ignored - To be defined by the component */
  static mysql_event_tracking_query_subclass_t filtered_sub_events;
 
  /** Callback function - To be implemented by component to handle an event */
  static bool callback(const mysql_event_tracking_query_data *data);
 
  /**
    event_tracking_query service implementation
 
    @param [in] data  Data related to query event
 
    @returns Status of operation
      @retval false Success
      @retval true  Failure
  */
  static DEFINE_BOOL_METHOD(notify,
                            (const mysql_event_tracking_query_data *data)) {
    try {
      if (!data) return true;
      if (filtered_sub_events & data->event_subclass) return false;
      return callback(data);
    } catch (...) {
      return true;
    }
  }
};
}  // namespace Event_tracking_implementation
 
#endif  // !EVENT_TRACKING_QUERY_CONSUMER_HELPER_H