Sammlung

Sammlung/Praktikum/4/js/es.js

@@ -0,0 +1,91 @@
+//------------------------------------------------------------------------------
+// Event-Service: asynchroner Nachrichtenaustausch
+//------------------------------------------------------------------------------
+// depends-on:
+//    jquery
+//    inheritance
+//    underscore
+//------------------------------------------------------------------------------
+
+function defer_p (notifier_ppl, entry_opl, message_spl, data_opl) {
+   return setTimeout(function() {
+      return notifier_ppl.apply(entry_opl, [entry_opl, message_spl, data_opl]); 
+   }, 1);
+}
+
+function each(object_opl, iterator, context) {
+   for (var key in object_opl) {
+      iterator.call(context, object_opl[key], key);
+   }
+} 
+  
+function findAll(object_opl, iterator, context) {
+   var results = [];
+   each(object_opl, function(value, index) {
+      if (iterator.call(context, value, index))
+         results.push(value);
+   });
+   return results;
+} 
+  
+function compact(object_opl) {
+   return findAll(object_opl, function(value) {
+      return value != null;
+   });
+} 
+  
+//------------------------------------------------------------------------------
+var EventService_cl = Class.create({
+//------------------------------------------------------------------------------
+   initialize: function () {
+      this.Data_o       = null;
+      this.Subscriber_o = {};
+      this.Method_o     = null;
+   },
+   subscribe_px: function (Subscriber_opl, Message_spl) {
+      if (Message_spl in this.Subscriber_o) {
+         // Message bekannt, Liste der Subscriber untersuchen
+         if (this.Subscriber_o[Message_spl].indexOf(Subscriber_opl) == -1) {
+            this.Subscriber_o[Message_spl].push(Subscriber_opl);
+         }
+      } else {
+         // Message noch nicht vorhanden, neu eintragen
+         this.Subscriber_o[Message_spl] = [Subscriber_opl];
+      }
+   },
+   unSubscribe_px: function (Subscriber_opl, Message_spl) {
+      if (Message_spl in this.Subscriber_o) {
+         // Message bekannt, Liste der Subscriber untersuchen
+         var Entry_a = this.Subscriber_o[Message_spl];
+         var index_i = Entry_a.indexOf(Subscriber_opl);
+         if (index_i >= 0) {
+            // Eintrag entfernen
+            Entry_a[index_i] = null;
+            Entry_a = compact(Entry_a); // compact liefert Kopie!
+            if (Entry_a.length == 0) {
+               // keine Subscriber mehr, kann entfernt werden
+               delete this.Subscriber_o[Message_spl];
+            }
+         }
+      } else {
+         // Message nicht vorhanden, falsche Anforderung
+      }
+   },
+   publish_px: function (Message_spl, Data_opl) {
+      console.info('es - publish ' + Message_spl);
+      each(this.Subscriber_o, function (value_apl, key_spl) {
+            // geliefert wird jeweils ein Wert, hier ein Array, und der Key
+            if (key_spl == Message_spl) {
+               // an alle Subscriber weitergeben
+               each(value_apl, function (entry_opl, index_ipl) {
+                     // geliefert wird hier das Element und der Index
+                     //_.defer(entry_opl.notify_px, entry_opl, Message_spl, Data_opl);
+                     defer_p(entry_opl.notify_px, entry_opl, Message_spl, Data_opl);
+                  }, this
+               );
+            }
+         }, this
+      )
+   }
+});
+// EOF