component_sys_var_service_imp.h

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/* Copyright (c) 2017, 2023, 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 also distributed with certain software (including
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as designated in a particular file or component or in included license
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This program is distributed in the hope that it will be useful,
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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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 COMPONENT_SYSTEM_VAR_SERVICE_H
#define COMPONENT_SYSTEM_VAR_SERVICE_H
 
#include <mysql/components/service_implementation.h>
#include <mysql/components/services/component_sys_var_service.h>
 
void mysql_comp_sys_var_services_init();
 
/**
  An implementation of the configuration system variables Service to register
  variable and unregister variable.
*/
class mysql_component_sys_variable_imp {
 public:
  /**
    Register's component system variables.
 
    @param component_name  name of the component
    @param var_name variable name
    @param flags tells about the variable type
    @param comment variable comment message
    @param check_func function pointer, which is called at variable check time
    @param update_func function pointer, which is called at update time
    @param check_arg  type defined check constraints block
    @param variable_value place holder for variable value
    @return Status of performed operation
    @retval false success
    @retval true failure
  */
  static DEFINE_BOOL_METHOD(register_variable,
                            (const char *component_name, const char *var_name,
                             int flags, const char *comment,
                             mysql_sys_var_check_func check_func,
                             mysql_sys_var_update_func update_func,
                             void *check_arg, void *variable_value));
 
  /**
    Get the component system variable value from the global structure.
 
    @param component_name Name of the component
    @param var_name Name of the variable
    @param[in,out] val On input: a buffer to hold the value. On output a pointer
    to the value.
    @param[in,out] out_length_of_val On input: size of longest string that the
    buffer can contain. On output the length of the copied string.
    @return Status of performed operation
    @retval false success
    @retval true failure
  */
  static DEFINE_BOOL_METHOD(get_variable,
                            (const char *component_name, const char *var_name,
                             void **val, size_t *out_length_of_val));
 
  /**
    Unregister's component system variable.
 
    @param component_name name of the component
    @param var_name Variable name
    @return Status of performed operation
    @retval false success
    @retval true failure
  */
  static DEFINE_BOOL_METHOD(unregister_variable,
                            (const char *component_name, const char *var_name));
};
#endif /* COMPONENT_SYSTEM_VAR_SERVICE_H */