[rygel] core: Thumbnailer should be singleton

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 89fafbabf642d201c8ea026dc3ad26032cf049cb
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Tue Sep 8 16:47:18 2009 +0300

    core: Thumbnailer should be singleton

 src/rygel/rygel-http-server.vala |   13 ++++++-------
 src/rygel/rygel-thumbnailer.vala |   19 ++++++++++++++++++-
 2 files changed, 24 insertions(+), 8 deletions(-)
---
diff --git a/src/rygel/rygel-http-server.vala b/src/rygel/rygel-http-server.vala
index 6e470a2..38b1d55 100644
--- a/src/rygel/rygel-http-server.vala
+++ b/src/rygel/rygel-http-server.vala
@@ -33,7 +33,6 @@ internal class Rygel.HTTPServer : Rygel.TranscodeManager, Rygel.StateMachine {
     public MediaContainer root_container;
     public GUPnP.Context context;
     private ArrayList<HTTPRequest> requests;
-    private Thumbnailer thumbnailer;
 
     private Cancellable cancellable;
 
@@ -47,12 +46,10 @@ internal class Rygel.HTTPServer : Rygel.TranscodeManager, Rygel.StateMachine {
 
         this.path_root = SERVER_PATH_PREFIX + "/" + name;
 
-        try {
-            this.thumbnailer = new Thumbnailer ();
+        var thumbnailer = Thumbnailer.get_default ();
+        if (thumbnailer != null) {
             this.context.host_path (thumbnailer.directory,
                                     this.path_root + "/thumbnails");
-        } catch (ThumbnailerError err) {
-            warning ("No thumbnailer available: %s", err.message);
         }
     }
 
@@ -86,13 +83,15 @@ internal class Rygel.HTTPServer : Rygel.TranscodeManager, Rygel.StateMachine {
         if (item.upnp_class.has_prefix (MediaItem.IMAGE_CLASS) ||
             item.upnp_class.has_prefix (MediaItem.VIDEO_CLASS) &&
             item.thumbnails.size == 0) {
+            var thumbnailer = Thumbnailer.get_default ();
+
             // Lets see if we can provide the thumbnails
-            if (this.thumbnailer != null) {
+            if (thumbnailer != null) {
                 foreach (var uri in item.uris) {
                     Thumbnail thumbnail = null;
 
                     try {
-                        thumbnail = this.thumbnailer.get_thumbnail (uri);
+                        thumbnail = thumbnailer.get_thumbnail (uri);
                         thumbnail.add_resource (didl_item, "internal");
 
                         // Now create the HTTP URI
diff --git a/src/rygel/rygel-thumbnailer.vala b/src/rygel/rygel-thumbnailer.vala
index 40ae3dc..6918e21 100644
--- a/src/rygel/rygel-thumbnailer.vala
+++ b/src/rygel/rygel-thumbnailer.vala
@@ -31,12 +31,15 @@ internal errordomain ThumbnailerError {
  * Provides thumbnails for images and vidoes.
  */
 internal class Rygel.Thumbnailer : GLib.Object {
+    private static Thumbnailer thumbnailer; // Our singleton object
+    private static bool first_time = true;
+
     public string directory;
 
     private Thumbnail template;
     private string extension;
 
-    public Thumbnailer () throws ThumbnailerError {
+    private Thumbnailer () throws ThumbnailerError {
         var dir = Path.build_filename (Environment.get_home_dir (),
                                        ".thumbnails",
                                        "cropped");
@@ -70,6 +73,20 @@ internal class Rygel.Thumbnailer : GLib.Object {
         this.directory = dir;
     }
 
+    public static Thumbnailer? get_default () {
+        if (first_time) {
+            try {
+                thumbnailer = new Thumbnailer ();
+            } catch (ThumbnailerError err) {
+                warning ("No thumbnailer available: %s", err.message);
+            }
+
+            first_time = false;
+        }
+
+        return thumbnailer;
+    }
+
     public Thumbnail get_thumbnail (string uri) throws ThumbnailerError {
         Thumbnail thumbnail = null;