[mod] improving method what resolves selection of the resource what s…

…hould be shown

[add] put post output processing configuration to the example file for the user configuration

foafpressapp/core/Foafpress.php

@@ -483,6 +483,13 @@ protected function ResolveResourceRequest()
         {
             return $this->arc2_resource->index[$checkTopicOfUri]['http://xmlns.com/foaf/0.1/primaryTopic'][0]['value'];
         }
+        elseif (($index_resource_uris = array_keys($this->arc2_resource->index)) &&
+                is_array($index_resource_uris) &&
+                isset($index_resource_uris[0]))
+        {
+            // fallback: return uri of the resource what is found first
+            return $index_resource_uris[0];
+        }
         else
         {
             // last fallback, use url of requested rdf document
@@ -666,7 +673,7 @@ public function dieWithException($message = null)
     {
         if (!$message)
         {
-            throw new Exception('Need error message! Message: '.$message);
+            throw new Exception('Need error message!');
         }
 
         throw new Exception($message); // TODO insert line where the exception was triggered

fp-config.php-example

@@ -165,6 +165,21 @@
 # $c['Foafpress']['LinkedData']['cachetime'] = -1; // one time cache, no invalidation, default: 7 days
 # $c['Foafpress']['Activity']['cachetime'] = 2 * 60 * 60;  // 2 hours, default: 6 hours
 
+/* -- Enable post output processing --------------------------------------------
+ *
+ * If you enable this, Faofpress will use old output caches to serve the request
+ * instantly, but keeps running to do all the time-consuming data aggregations
+ * after this output, and creating a new cache what can served to the next user.
+ * This is done for performance issues because without post output processing
+ * the user must wait until Foafpress updated all data caches.
+ *
+ * Be aware that this process experimental, usually it should work in most
+ * browsers but it could have problems with some other (older) browser clients.
+ * That is the reason why it is turned off by default.
+ */
+
+# $c['Foafpress']['enableOutputPostprocessing'] = true; // default: false
+
 /* -- Ignore resources ---------------------------------------------------------
  *
  * You may want Foafpress to ignore some resources because you want to use them