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56 #ifndef _SCI_BASE_OBSERVER_H_
57 #define _SCI_BASE_OBSERVER_H_
62 * @brief This file contains all of the structures, constants, and methods
63 * common to all base observer object definitions.
70 #if defined(SCI_LOGGING)
72 struct SCI_BASE_OBSERVER;
73 struct SCI_BASE_SUBJECT;
76 * @typedef SCI_BASE_OBSERVER_UPDATE_T
78 * @brief This type definition defines the format for the update method
79 * that is invoked for all observers participating in the observer
82 typedef void (*SCI_BASE_OBSERVER_UPDATE_T)(
83 struct SCI_BASE_OBSERVER *this_observer,
84 struct SCI_BASE_SUBJECT *the_subject
88 * @struct SCI_BASE_OBSERVER
90 * @brief This structure defines the fields necessary for an object that
91 * intends to participate as an observer.
93 typedef struct SCI_BASE_OBSERVER
96 * This filed points to the next observer if there is one
98 struct SCI_BASE_OBSERVER *next;
101 * This field defines the function pointer that is invoked in order to
102 * notify the observer of a change in the subject (i.e. observed object).
104 SCI_BASE_OBSERVER_UPDATE_T update;
106 } SCI_BASE_OBSERVER_T;
109 * @brief This method is the basic constructor for the observer
111 * @param[in] this_observer This parameter specifies the observer to
113 * @param[in] update This parameter specifies the update method to be
114 * invoked for this observer.
118 void sci_base_observer_construct(
119 struct SCI_BASE_OBSERVER *this_observer,
120 SCI_BASE_OBSERVER_UPDATE_T update
124 * @brief This method performs the actions of construction and attaches to the
127 * @pre The the_subject to be observed must be constructed before this call.
129 * @param[in] this_observer This parameter specifies the observer to construct
130 * an attach to the subject.
131 * @param[in] update This parameter is the update function that is passed to
133 * @param[in] the_subject This parameter specifies the subject to observe.
135 void sci_base_observer_initialize(
136 struct SCI_BASE_OBSERVER *this_observer,
137 SCI_BASE_OBSERVER_UPDATE_T update,
138 struct SCI_BASE_SUBJECT *the_subject
142 * @brief This method will call the observers update function
144 * @param[in] this_observer This parameter specifies the observer to be
146 * @param[in] the_subject This parameter indicates the subject for which
147 * the update call is occurring.
151 void sci_base_observer_update(
152 struct SCI_BASE_OBSERVER *this_observer,
153 struct SCI_BASE_SUBJECT *the_subject
156 #else // defined(SCI_LOGGING)
158 typedef U8 SCI_BASE_OBSERVER_T;
159 #define sci_base_observer_construct
160 #define sci_base_observer_initialize
161 #define sci_base_observer_update
163 #endif // defined(SCI_LOGGING)
167 #endif // __cplusplus
169 #endif // _SCI_BASE_OBSERVER_H_