event_tracking_lifecycle_consumer_helper.h

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/* Copyright (c) 2022, 2024, 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.
 
   This program is designed to work with certain software (including
   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
   separately licensed software that they have either included with
   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
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef EVENT_TRACKING_LIFECYCLE_CONSUMER_HELPER_H
#define EVENT_TRACKING_LIFECYCLE_CONSUMER_HELPER_H
 
#include "mysql/components/component_implementation.h"
#include "mysql/components/service_implementation.h"
#include "mysql/components/services/event_tracking_lifecycle_service.h"
 
/**
  @file event_tracking_lifecycle_consumer_helper.h
  Helper file to create lifecycle event consumer
*/
 
// clang-format off
/**
  @anchor EVENT_TRACKING_LIFECYCLE_CONSUMER_EXAMPLE
 
  @code
 
  #include "mysql/components/util/event_tracking_lifecycle_consumer_helper.h"
 
  namespace Event_tracking_implementation {
 
  // Replace following with union of startup subevents to be filtered
  Event_tracking_lifecycle_subclass_t
    Event_tracking_lifecycle_implementation::startup_filtered_sub_events = 0;
 
  // Replace following with union of shutdown subevents to be filtered
  Event_tracking_lifecycle_subclass_t
    Event_tracking_lifecycle_implementation::shutdown_filtered_sub_events = 0;
 
  bool Event_tracking_lifecycle_implementation::callback(
      const mysql_event_tracking_startup_data *data [[maybe_unused]]) {
      // Your code goes here
  }
 
  bool Event_tracking_lifecycle_implementation::callback(
    const mysql_event_tracking_shutdown_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_LIFECYCLE(<implementation_name>);
 
  BEGIN_COMPONENT_PROVIDES(<component_name>)
  PROVIDES_SERVICE_EVENT_TRACKING_LIFECYCLE(<implementation_name>)
  END_COMPONENT_PROVIDES()
 
  // Rest of the component declaration code
 
  @endcode
*/
// clang-format on
 
#define PROVIDES_SERVICE_EVENT_TRACKING_LIFECYCLE(component) \
  PROVIDES_SERVICE(component, event_tracking_lifecycle)
 
#define IMPLEMENTS_SERVICE_EVENT_TRACKING_LIFECYCLE(component)                 \
  BEGIN_SERVICE_IMPLEMENTATION(component, event_tracking_lifecycle)            \
  Event_tracking_implementation::Event_tracking_lifecycle_implementation::     \
      notify_startup,                                                          \
      Event_tracking_implementation::Event_tracking_lifecycle_implementation:: \
          notify_shutdown                                                      \
          END_SERVICE_IMPLEMENTATION()
 
namespace Event_tracking_implementation {
/** Implementation helper class for lifecycle events. */
class Event_tracking_lifecycle_implementation {
 public:
  /** Sub-events to be filtered/ignored - To be defined by the component */
  static mysql_event_tracking_startup_subclass_t startup_filtered_sub_events;
 
  /** Sub-events to be filtered/ignored - To be defined by the component */
  static mysql_event_tracking_shutdown_subclass_t shutdown_filtered_sub_events;
 
  /** Callback function - To be implemented by component to handle an event */
  static bool callback(const mysql_event_tracking_startup_data *data);
 
  /** Callback function - To be implemented by component to handle an event */
  static bool callback(const mysql_event_tracking_shutdown_data *data);
 
  /**
    event_tracking_lifecycle service implementation
 
    @param [in] data  Data related to startup event
 
    @returns Status of operation
      @retval false Success
      @retval true  Failure
  */
  static DEFINE_BOOL_METHOD(notify_startup,
                            (const mysql_event_tracking_startup_data *data)) {
    try {
      if (!data) return true;
      if (data->event_subclass & startup_filtered_sub_events) return false;
      return callback(data);
    } catch (...) {
      return true;
    }
  }
 
  /**
    event_tracking_lifecycle service implementation
 
    @param [in] data  Data related to shutdown event
 
    @returns Status of operation
      @retval false Success
      @retval true  Failure
  */
  static DEFINE_BOOL_METHOD(notify_shutdown,
                            (const mysql_event_tracking_shutdown_data *data)) {
    try {
      if (!data) return true;
      if (data->event_subclass & shutdown_filtered_sub_events) return false;
      return callback(data);
    } catch (...) {
      return true;
    }
  }
};
}  // namespace Event_tracking_implementation
 
#endif  // !EVENT_TRACKING_LIFECYCLE_CONSUMER_HELPER_H