1 files changed, 82 insertions, 0 deletions
diff --git a/public/app/extends/Cache_service.php b/public/app/extends/Cache_service.php
new file mode 100644
index 0000000..52311f3
--- /dev/null
+++ b/public/app/extends/Cache_service.php
@@ -0,0 +1,82 @@
+<?php 
+namespace app\extends;
+
+use app\models\cms\Course_model;
+use app\models\admin\Privilege_model;
+
+/** Cache service
+ * -----------------------------------------------------------------------------
+ * 
+ * class that gathers common source-expensive queries
+ * and helps for performance optimization
+ * 
+ * when forcing cache creation the following option is used:
+ * $options = PROXY_IGNORE_CACHE
+ * 
+ */
+class Cache_service
+{
+
+    public static function courses_struct( $options = 0 )
+    {
+        return proxy(                  // cache-get courses
+            [\app\models\cms\Course_model::class, 'courses_struct'],
+            [], CACHE_ROOT_TTL,
+            $options
+        );
+    }
+
+    public static function files_attributes( $options = 0 )
+    {
+        return  proxy(
+            [\app\models\cms\Course_model::class, 'files'],
+            [], CACHE_ROOT_TTL,
+            $options
+        );
+    }
+
+
+    public static function privileges_hierarchy( $options = 0 )
+    {
+        return proxy(
+            [\app\models\admin\Privilege_model::class, 'privileges'],
+            [], CACHE_ROOT_TTL,
+            $options
+        );
+    }
+
+    public static function pages_list( $options = 0 )
+    {
+        return proxy(
+            [\app\models\cms\Course_model::class, 'pages'],
+            [], CACHE_ROOT_TTL,
+            $options
+        );
+    }
+
+
+    /** entity
+     * 
+     * create and retrieve a cached array of some entity
+     * 
+     * @param $entiry (string|method): method of the main CMS model
+     * NOTE: CRITICAL: method must exist in the main CMS model
+     */
+    public static function entity( $entity, $options = 0 )
+    {
+        $allowed_methods = [    // to make sure method existence
+            'page',
+            'course',
+            'lesson',
+        ];
+
+        // TODO: needs testing before release
+        // return proxy(
+        //     [\app\models\admin\Course_model::class, $entity],
+        //     [], CACHE_ROOT_TTL,
+        //     $options
+        // );
+    }
+
+
+}
+\ No newline at end of file