SINQ Wiki: Diff: CallbackMessage

Diff: CallbackMessage

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JSPWiki v2.0.52

           Difference between 
          version 2 
          and 
          version 1:
          
          
Lines 5-8 were replaced by lines 5-8
- typedef struct {
-   char *class;
-   /* ... message data ... */
- } <message class>;
+   typedef struct {
+     char *class;
+     /* ... message data ... */
+   } <message class>;
Line 12 was replaced by lines 12-28
- Example:
+ In our example we have a module ''nodehandling''.
+
+ Extract from nodehandling.h:
+ {{{
+   typedef struct {
+     char *class;
+     SConnection *pCon;
+     Hdb *node;
+     ValueStruct *value;
+   } SetCallbackMsg;
+
+   SetCallbackMsg *SetClassCast(void *msg);
+ }}}
+
+ SetClassCast returns the message if it is a SetCallbackMsg or NULL otherwise.
+
+ Extract from nodehandling.c:
Line 14 was replaced by lines 30-37
- static char *setCallbackClass="set callback";
+   static char *setCallbackClass="set callback";
+
+   SetCallbackMsg *SetClassCast(void *msg) {
+     if (SetCallbackMsg *)msg)->class == SetCallbackClass) {
+       return msg;
+     }
+     return NULL;
+   }
Lines 16-21 were replaced by line 39
- typedef struct {
-   char *class;
-   SConnection *pCon;
-   Hdb *node;
-   ValueStruct *value;
- } SetCallbackMsg;
+   ...
Line 23 was replaced by line 41
- ...
+   /* calling the callback */
Removed lines 25-26
- /* calling the callback */
- {
Line 33 was replaced by lines 49-75
- }
+ }}}
+
+ Extract from a module implementing a callback:
+ {{{
+   int MySetCallback(Hdb *node, void *msg, void *data) {
+     SetCallbackMsg *setMsg = SetClassCast(msg);
+
+     if (! setMsg) return 0; /* not handled */
+
+     /* do the set */
+
+     return 1;
+   }
+
+   ...
+
+   void KillMyData(MyData *data) {
+     /* free resources */
+   }
+   ...
+
+   MyData *data;
+   Callback *cb;
+
+   cb = MakeCallback(MySetCallback, data, (KillFunc)KillMyData);
+   AppendCallback(node, cb);
+ }}}


          

      

      

      
      Back to CallbackMessage,
       or to the Page History.
 Lines 5-8 were replaced by lines 5-8
-- typedef struct {
--   char *class;
--   /* ... message data ... */
-- } <message class>;
++   typedef struct {
++     char *class;
++     /* ... message data ... */
++   } <message class>;
 Line 12 was replaced by lines 12-28
-- Example:
++ In our example we have a module ''nodehandling''.
++
++ Extract from nodehandling.h:
++ {{{
++   typedef struct {
++     char *class;
++     SConnection *pCon;
++     Hdb *node;
++     ValueStruct *value;
++   } SetCallbackMsg;
++
++   SetCallbackMsg *SetClassCast(void *msg);
++ }}}
++
++ SetClassCast returns the message if it is a SetCallbackMsg or NULL otherwise.
++
++ Extract from nodehandling.c:
 Line 14 was replaced by lines 30-37
-- static char *setCallbackClass="set callback";
++   static char *setCallbackClass="set callback";
++
++   SetCallbackMsg *SetClassCast(void *msg) {
++     if (SetCallbackMsg *)msg)->class == SetCallbackClass) {
++       return msg;
++     }
++     return NULL;
++   }
 Lines 16-21 were replaced by line 39
-- typedef struct {
--   char *class;
--   SConnection *pCon;
--   Hdb *node;
--   ValueStruct *value;
-- } SetCallbackMsg;
++   ...
 Line 23 was replaced by line 41
-- ...
++   /* calling the callback */
 Removed lines 25-26
-- /* calling the callback */
-- {
 Line 33 was replaced by lines 49-75
-- }
++ }}}
++
++ Extract from a module implementing a callback:
++ {{{
++   int MySetCallback(Hdb *node, void *msg, void *data) {
++     SetCallbackMsg *setMsg = SetClassCast(msg);
++
++     if (! setMsg) return 0; /* not handled */
++
++     /* do the set */
++
++     return 1;
++   }
++
++   ...
++
++   void KillMyData(MyData *data) {
++     /* free resources */
++   }
++   ...
++
++   MyData *data;
++   Callback *cb;
++
++   cb = MakeCallback(MySetCallback, data, (KillFunc)KillMyData);
++   AppendCallback(node, cb);
++ }}}