MySQL 8.0.33
Source Code Documentation
component_sys_var_service_imp.h
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22
23#ifndef COMPONENT_SYSTEM_VAR_SERVICE_H
24#define COMPONENT_SYSTEM_VAR_SERVICE_H
25
28
30
31/**
32 An implementation of the configuration system variables Service to register
33 variable and unregister variable.
34*/
36 public:
37 /**
38 Register's component system variables.
39
40 @param component_name name of the component
41 @param var_name variable name
42 @param flags tells about the variable type
43 @param comment variable comment message
44 @param check_func function pointer, which is called at variable check time
45 @param update_func function pointer, which is called at update time
46 @param check_arg type defined check constraints block
47 @param variable_value place holder for variable value
48 @return Status of performed operation
49 @retval false success
50 @retval true failure
51 */
53 (const char *component_name, const char *var_name,
54 int flags, const char *comment,
55 mysql_sys_var_check_func check_func,
56 mysql_sys_var_update_func update_func,
57 void *check_arg, void *variable_value));
58
59 /**
60 Get the component system variable value from the global structure.
61
62 @param component_name Name of the component
63 @param var_name Name of the variable
64 @param[in,out] val On input: a buffer to hold the value. On output a pointer
65 to the value.
66 @param[in,out] out_length_of_val On input: size of longest string that the
67 buffer can contain. On output the length of the copied string.
68 @return Status of performed operation
69 @retval false success
70 @retval true failure
71 */
73 (const char *component_name, const char *var_name,
74 void **val, size_t *out_length_of_val));
75
76 /**
77 Unregister's component system variable.
78
79 @param component_name name of the component
80 @param var_name Variable name
81 @return Status of performed operation
82 @retval false success
83 @retval true failure
84 */
86 (const char *component_name, const char *var_name));
87};
88#endif /* COMPONENT_SYSTEM_VAR_SERVICE_H */
An implementation of the configuration system variables Service to register variable and unregister v...
Definition: component_sys_var_service_imp.h:35
static mysql_service_status_t get_variable(const char *component_name, const char *var_name, void **val, size_t *out_length_of_val) noexcept
Get the component system variable value from the global structure.
Definition: component_sys_var_service.cc:527
static mysql_service_status_t unregister_variable(const char *component_name, const char *var_name) noexcept
Unregister's component system variable.
Definition: component_sys_var_service.cc:549
static mysql_service_status_t 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) noexcept
Register's component system variables.
Definition: component_sys_var_service.cc:122
int(* mysql_sys_var_check_func)(MYSQL_THD thd, SYS_VAR *var, void *save, struct st_mysql_value *value)
Signature for the check function.
Definition: component_sys_var_service.h:76
void(* mysql_sys_var_update_func)(MYSQL_THD thd, SYS_VAR *var, void *val_ptr, const void *save)
Signature for the update function.
Definition: component_sys_var_service.h:104
void mysql_comp_sys_var_services_init()
Definition: component_sys_var_service.cc:92
static int flags[50]
Definition: hp_test1.cc:39
#define comment
Definition: lexyy.cc:959
Specifies macros to define Service Implementations.
#define DEFINE_BOOL_METHOD(name, args)
A short macro to define method that returns bool, which is the most common case.
Definition: service_implementation.h:87