[gnome-games/wip/exalm/cache2] grilo: Queue loading

[Alexander Mikhaylenko <alexm src gnome org>]

commit b6d78f654aa79408b01bc462c0642c5880eeaeb0
Author: Alexander Mikhaylenko <exalm7659 gmail com>
Date:   Sat Oct 6 20:00:58 2018 +0500

    grilo: Queue loading
    
    Put all GriloMedia requests into a global queue and process them one by
    one. This allows to avoid UI stalling while loading metadata for many
    games at once at a cost of it taking longer time.

 src/grilo/grilo-cooperative.vala  |  2 +-
 src/grilo/grilo-cover.vala        |  2 +-
 src/grilo/grilo-description.vala  |  2 +-
 src/grilo/grilo-developer.vala    |  2 +-
 src/grilo/grilo-genre.vala        |  2 +-
 src/grilo/grilo-media-queue.vala  | 36 ++++++++++++++++++++++++++++++++++++
 src/grilo/grilo-media.vala        | 10 ++++++++++
 src/grilo/grilo-players.vala      |  2 +-
 src/grilo/grilo-publisher.vala    |  2 +-
 src/grilo/grilo-rating.vala       |  2 +-
 src/grilo/grilo-release-date.vala |  2 +-
 src/meson.build                   |  1 +
 12 files changed, 56 insertions(+), 9 deletions(-)
---
diff --git a/src/grilo/grilo-cooperative.vala b/src/grilo/grilo-cooperative.vala
index 808c78f4..72aef355 100644
--- a/src/grilo/grilo-cooperative.vala
+++ b/src/grilo/grilo-cooperative.vala
@@ -19,7 +19,7 @@ public class Games.GriloCooperative : Object, Cooperative {
                        return cooperative;
 
                resolving = true;
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
 
                return cooperative;
        }
diff --git a/src/grilo/grilo-cover.vala b/src/grilo/grilo-cover.vala
index 5736237e..db53bc09 100644
--- a/src/grilo/grilo-cover.vala
+++ b/src/grilo/grilo-cover.vala
@@ -35,7 +35,7 @@ public class Games.GriloCover : Object, Cover {
 
                resolving = true;
 
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
 
                return icon;
        }
diff --git a/src/grilo/grilo-description.vala b/src/grilo/grilo-description.vala
index 87ccdfe3..7abae3da 100644
--- a/src/grilo/grilo-description.vala
+++ b/src/grilo/grilo-description.vala
@@ -22,7 +22,7 @@ public class Games.GriloDescription : Object, Description {
                        return description;
 
                resolving = true;
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
 
                return description;
        }
diff --git a/src/grilo/grilo-developer.vala b/src/grilo/grilo-developer.vala
index 83118b76..1ca7abf2 100644
--- a/src/grilo/grilo-developer.vala
+++ b/src/grilo/grilo-developer.vala
@@ -18,7 +18,7 @@ public class Games.GriloDeveloper : Object, Developer {
                        return developer;
 
                resolving = true;
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
 
                return developer;
        }
diff --git a/src/grilo/grilo-genre.vala b/src/grilo/grilo-genre.vala
index da3a7925..87a01633 100644
--- a/src/grilo/grilo-genre.vala
+++ b/src/grilo/grilo-genre.vala
@@ -22,7 +22,7 @@ public class Games.GriloGenre : Object, Genre {
                        return genre;
 
                resolving = true;
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
 
                return genre;
        }
diff --git a/src/grilo/grilo-media-queue.vala b/src/grilo/grilo-media-queue.vala
new file mode 100644
index 00000000..5c9ec814
--- /dev/null
+++ b/src/grilo/grilo-media-queue.vala
@@ -0,0 +1,36 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+public class Games.GriloMediaQueue : Object {
+       private Queue<GriloMedia> queue;
+       private GriloMedia current_media;
+
+       private static Once<GriloMediaQueue> instance;
+
+       construct {
+               queue = new Queue<GriloMedia> ();
+       }
+
+       private static GriloMediaQueue create_instance () {
+               return new GriloMediaQueue ();
+       }
+
+       public static unowned GriloMediaQueue get_instance () {
+               return instance.once (create_instance);
+       }
+
+       public void append (GriloMedia media) {
+               queue.push_tail (media);
+
+               if (current_media == null)
+                       load_next_media ();
+       }
+
+       private void load_next_media () {
+               if (queue.is_empty ())
+                       return;
+
+               current_media = queue.pop_head ();
+               current_media.resolved.connect (load_next_media);
+               current_media.try_resolve_media ();
+       }
+}
diff --git a/src/grilo/grilo-media.vala b/src/grilo/grilo-media.vala
index 738cb710..9cec6da9 100644
--- a/src/grilo/grilo-media.vala
+++ b/src/grilo/grilo-media.vala
@@ -14,6 +14,8 @@ public class Games.GriloMedia : Object {
 
        private Grl.Media? media;
 
+       private bool queued;
+
        public GriloMedia (Title title, string mime_type) {
                this.title = title;
                this.mime_type = mime_type;
@@ -51,6 +53,14 @@ public class Games.GriloMedia : Object {
                }
        }
 
+       public void try_resolve_media_queued () {
+               if (queued)
+                       return;
+
+               GriloMediaQueue.get_instance ().append (this);
+               queued = true;
+       }
+
        internal Grl.Media? get_media () {
                return media;
        }
diff --git a/src/grilo/grilo-players.vala b/src/grilo/grilo-players.vala
index 864546a7..1ce76916 100644
--- a/src/grilo/grilo-players.vala
+++ b/src/grilo/grilo-players.vala
@@ -22,7 +22,7 @@ public class Games.GriloPlayers : Object, Players {
                        return players;
 
                resolving = true;
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
 
                return players;
        }
diff --git a/src/grilo/grilo-publisher.vala b/src/grilo/grilo-publisher.vala
index fa656081..dcd43a54 100644
--- a/src/grilo/grilo-publisher.vala
+++ b/src/grilo/grilo-publisher.vala
@@ -22,7 +22,7 @@ public class Games.GriloPublisher : Object, Publisher {
                        return publisher;
 
                resolving = true;
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
 
                return publisher;
        }
diff --git a/src/grilo/grilo-rating.vala b/src/grilo/grilo-rating.vala
index 4a6e18b1..20ed0ff9 100644
--- a/src/grilo/grilo-rating.vala
+++ b/src/grilo/grilo-rating.vala
@@ -19,7 +19,7 @@ public class Games.GriloRating : Object, Rating {
                        return rating;
 
                resolving = true;
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
                return rating;
        }
 
diff --git a/src/grilo/grilo-release-date.vala b/src/grilo/grilo-release-date.vala
index 30de60b8..ae4c9a23 100644
--- a/src/grilo/grilo-release-date.vala
+++ b/src/grilo/grilo-release-date.vala
@@ -22,7 +22,7 @@ public class Games.GriloReleaseDate : Object, ReleaseDate {
                        return release_date;
 
                resolving = true;
-               media.try_resolve_media ();
+               media.try_resolve_media_queued ();
 
                return release_date;
        }
diff --git a/src/meson.build b/src/meson.build
index 2bb73e11..8e9882f0 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -106,6 +106,7 @@ vala_sources = [
   'grilo/grilo-developer.vala',
   'grilo/grilo-genre.vala',
   'grilo/grilo-media.vala',
+  'grilo/grilo-media-queue.vala',
   'grilo/grilo-players.vala',
   'grilo/grilo-publisher.vala',
   'grilo/grilo-rating.vala',