[rygel] media-export: Make MediaCache single-instance

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 7c17162b41328cbad238d934094b2d6250f804c2
Author: Jens Georg <mail jensge org>
Date:   Wed Jul 28 18:29:24 2010 +0200

    media-export: Make MediaCache single-instance

 .../rygel-media-export-media-cache.vala            |   14 ++++++++++++--
 .../rygel-media-export-root-container.vala         |    2 +-
 2 files changed, 13 insertions(+), 3 deletions(-)
---
diff --git a/src/plugins/media-export/rygel-media-export-media-cache.vala b/src/plugins/media-export/rygel-media-export-media-cache.vala
index a6a7304..747786d 100644
--- a/src/plugins/media-export/rygel-media-export-media-cache.vala
+++ b/src/plugins/media-export/rygel-media-export-media-cache.vala
@@ -47,6 +47,8 @@ public class Rygel.MediaExport.MediaCache : Object {
     private ObjectFactory factory;
     private SQLFactory sql;
 
+    private static MediaCache instance;
+
     public void remove_by_id (string id) throws DatabaseError {
         GLib.Value[] values = { id };
         this.db.exec (this.sql.make (SQLString.DELETE), values);
@@ -333,9 +335,17 @@ public class Rygel.MediaExport.MediaCache : Object {
         return children;
     }
 
-    public MediaCache (string name) throws Error {
+    public static MediaCache get_default () throws Error {
+        if (instance == null) {
+            instance = new MediaCache ();
+        }
+
+        return instance;
+    }
+
+    private MediaCache () throws Error {
         this.sql = new SQLFactory ();
-        this.open_db (name);
+        this.open_db ("media-export");
         this.factory = new ObjectFactory ();
     }
 
diff --git a/src/plugins/media-export/rygel-media-export-root-container.vala b/src/plugins/media-export/rygel-media-export-root-container.vala
index cdbb394..0dca896 100644
--- a/src/plugins/media-export/rygel-media-export-root-container.vala
+++ b/src/plugins/media-export/rygel-media-export-root-container.vala
@@ -257,7 +257,7 @@ public class Rygel.MediaExport.RootContainer : Rygel.MediaExport.DBContainer {
      * Create a new root container.
      */
     private RootContainer () throws Error {
-        var db = new MediaCache ("media-export");
+        var db = MediaCache.get_default ();
 
         base (db, "0", "MediaExportRoot");