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22 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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55 #include <sys/cdefs.h>
56 __FBSDID("$FreeBSD$");
61 * @brief This file contains the base subject method implementations and
62 * any constants or structures private to the base subject object.
63 * A subject is a participant in the observer design pattern. A
64 * subject represents the object being observed.
67 #include <dev/isci/scil/sci_types.h>
68 #include <dev/isci/scil/sci_base_subject.h>
69 #include <dev/isci/scil/sci_base_observer.h>
71 #if defined(SCI_LOGGING)
73 //******************************************************************************
74 //* P R O T E C T E D M E T H O D S
75 //******************************************************************************
77 void sci_base_subject_construct(
78 SCI_BASE_SUBJECT_T *this_subject
81 this_subject->observer_list = NULL;
84 // ---------------------------------------------------------------------------
86 void sci_base_subject_notify(
87 SCI_BASE_SUBJECT_T *this_subject
90 SCI_BASE_OBSERVER_T *this_observer = this_subject->observer_list;
92 while (this_observer != NULL)
94 sci_base_observer_update(this_observer, this_subject);
96 this_observer = this_observer->next;
100 // ---------------------------------------------------------------------------
102 void sci_base_subject_attach_observer(
103 SCI_BASE_SUBJECT_T *this_subject,
104 SCI_BASE_OBSERVER_T *observer
107 observer->next = this_subject->observer_list;
109 this_subject->observer_list = observer;
112 // ---------------------------------------------------------------------------
114 void sci_base_subject_detach_observer(
115 SCI_BASE_SUBJECT_T *this_subject,
116 SCI_BASE_OBSERVER_T *observer
119 SCI_BASE_OBSERVER_T *current_observer = this_subject->observer_list;
120 SCI_BASE_OBSERVER_T *previous_observer = NULL;
122 // Search list for the item to remove
124 current_observer != NULL
125 && current_observer != observer
128 previous_observer = current_observer;
129 current_observer = current_observer->next;
132 // Was this observer in the list?
133 if (current_observer == observer)
135 if (previous_observer != NULL)
137 // Remove from middle or end of list
138 previous_observer->next = observer->next;
142 // Remove from the front of the list
143 this_subject->observer_list = observer->next;
146 // protect the list so people dont follow bad pointers
147 observer->next = NULL;
151 #endif // defined(SCI_LOGGING)