[gnome-photos] Add PhotosTrackerQueue

[Debarshi Ray <debarshir src gnome org>]

commit 0517af1b1211d637cd1c9dc885643ab1c05d263a
Author: Debarshi Ray <debarshir gnome org>
Date:   Fri May 4 00:35:53 2012 +0200

    Add PhotosTrackerQueue

 src/Makefile.am            |    2 +
 src/photos-tracker-queue.c |  259 ++++++++++++++++++++++++++++++++++++++++++++
 src/photos-tracker-queue.h |   78 +++++++++++++
 3 files changed, 339 insertions(+), 0 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 4e2a3b3..68df3b9 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -67,6 +67,8 @@ gnome_photos_SOURCES = \
 	photos-source.h \
 	photos-source-manager.c \
 	photos-source-manager.h \
+	photos-tracker-queue.c \
+	photos-tracker-queue.h \
 	photos-utils.c \
 	photos-utils.h \
 	photos-view.c \
diff --git a/src/photos-tracker-queue.c b/src/photos-tracker-queue.c
new file mode 100644
index 0000000..3325641
--- /dev/null
+++ b/src/photos-tracker-queue.c
@@ -0,0 +1,259 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright  2012 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+
+#include "config.h"
+
+#include <glib.h>
+#include <tracker-sparql.h>
+
+#include "photos-tracker-queue.h"
+
+
+struct _PhotosTrackerQueuePrivate
+{
+  GQueue *queue;
+  TrackerSparqlConnection *connection;
+  gboolean running;
+};
+
+
+G_DEFINE_TYPE (PhotosTrackerQueue, photos_tracker_queue, G_TYPE_OBJECT);
+
+
+typedef enum
+{
+  PHOTOS_TRACKER_QUERY_SELECT,
+  PHOTOS_TRACKER_QUERY_UPDATE,
+  PHOTOS_TRACKER_QUERY_UPDATE_BLANK
+} PhotosTrackerQueryType;
+
+typedef struct _PhotosTrackerQueueData PhotosTrackerQueueData;
+
+struct _PhotosTrackerQueueData
+{
+  GAsyncReadyCallback callback;
+  GCancellable *cancellable;
+  GDestroyNotify destroy_data;
+  PhotosTrackerQueryType query_type;
+  gchar *sparql;
+  gpointer user_data;
+};
+
+
+void
+photos_tracker_queue_data_free (PhotosTrackerQueueData *data)
+{
+  g_object_unref (data->cancellable);
+  g_free (data->sparql);
+  (*data->destroy_data) (data->user_data);
+  g_slice_free (PhotosTrackerQueueData, data);
+}
+
+
+PhotosTrackerQueueData *
+photos_tracker_queue_data_new (const gchar *sparql,
+                               PhotosTrackerQueryType query_type,
+                               GCancellable *cancellable,
+                               GAsyncReadyCallback callback,
+                               gpointer user_data,
+                               GDestroyNotify destroy_data)
+{
+  PhotosTrackerQueueData *data;
+
+  data = g_slice_new0 (PhotosTrackerQueueData);
+  data->sparql = g_strdup (sparql);
+  data->query_type = query_type;
+  data->cancellable = cancellable;
+  data->callback = callback;
+  data->user_data = user_data;
+  data->destroy_data = destroy_data;
+
+  return data;
+}
+
+
+static void
+photos_tracker_queue_collector (GObject *source_object, GAsyncResult *res, gpointer user_data)
+{
+  PhotosTrackerQueue *self = PHOTOS_TRACKER_QUEUE (user_data);
+  PhotosTrackerQueuePrivate *priv = self->priv;
+  PhotosTrackerQueueData *data;
+
+  data = g_queue_pop_head (priv->queue);
+  (*data->callback) (source_object, res, data->user_data);
+  priv->running = FALSE;
+  photos_tracker_queue_data_free (data);
+}
+
+
+static void
+photos_tracker_queue_check (PhotosTrackerQueue *self)
+{
+  PhotosTrackerQueuePrivate *priv = self->priv;
+  PhotosTrackerQueueData *data;
+
+  if (priv->running)
+    return;
+
+  if (priv->queue->length == 0)
+    return;
+
+  data = g_queue_peek_head (priv->queue);
+  priv->running = TRUE;
+
+  g_message ("%s", data->sparql);
+
+  switch (data->query_type)
+    {
+    case PHOTOS_TRACKER_QUERY_SELECT:
+      tracker_sparql_connection_query_async (priv->connection,
+                                             data->sparql,
+                                             data->cancellable,
+                                             photos_tracker_queue_collector,
+                                             self);
+      break;
+
+    case PHOTOS_TRACKER_QUERY_UPDATE:
+      tracker_sparql_connection_update_async (priv->connection,
+                                              data->sparql,
+                                              G_PRIORITY_DEFAULT,
+                                              data->cancellable,
+                                              photos_tracker_queue_collector,
+                                              self);
+      break;
+
+    case PHOTOS_TRACKER_QUERY_UPDATE_BLANK:
+      tracker_sparql_connection_update_blank_async (priv->connection,
+                                                    data->sparql,
+                                                    G_PRIORITY_DEFAULT,
+                                                    data->cancellable,
+                                                    photos_tracker_queue_collector,
+                                                    self);
+      break;
+    }
+}
+
+
+static GObject *
+photos_tracker_queue_constructor (GType type, guint n_construct_params, GObjectConstructParam *construct_params)
+{
+  static GObject *self = NULL;
+
+  if (self == NULL)
+    {
+      self = G_OBJECT_CLASS (photos_tracker_queue_parent_class)->constructor (type,
+                                                                              n_construct_params,
+                                                                              construct_params);
+      g_object_add_weak_pointer (self, (gpointer) &self);
+      return self;
+    }
+
+  return g_object_ref (self);
+}
+
+
+static void
+photos_tracker_queue_dispose (GObject *object)
+{
+  PhotosTrackerQueue *self = PHOTOS_TRACKER_QUEUE (object);
+
+  g_clear_object (&self->priv->connection);
+
+  G_OBJECT_CLASS (photos_tracker_queue_parent_class)->dispose (object);
+}
+
+
+static void
+photos_tracker_queue_finalize (GObject *object)
+{
+  PhotosTrackerQueue *self = PHOTOS_TRACKER_QUEUE (object);
+
+  g_queue_free (self->priv->queue);
+
+  G_OBJECT_CLASS (photos_tracker_queue_parent_class)->finalize (object);
+}
+
+
+static void
+photos_tracker_queue_init (PhotosTrackerQueue *self)
+{
+  PhotosTrackerQueuePrivate *priv = self->priv;
+  GError *error;
+
+  self->priv = G_TYPE_INSTANCE_GET_PRIVATE (self, PHOTOS_TYPE_TRACKER_QUEUE, PhotosTrackerQueuePrivate);
+  priv = self->priv;
+
+  priv->queue = g_queue_new ();
+
+  error = NULL;
+  priv->connection = tracker_sparql_connection_get (NULL, &error);
+  if (error != NULL)
+    {
+      g_warning ("Unable to connect to the Tracker database: %s", error->message);
+      g_error_free (error);
+      return;
+    }
+}
+
+
+static void
+photos_tracker_queue_class_init (PhotosTrackerQueueClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  object_class->constructor = photos_tracker_queue_constructor;
+  object_class->dispose = photos_tracker_queue_dispose;
+  object_class->finalize = photos_tracker_queue_finalize;
+
+  g_type_class_add_private (class, sizeof (PhotosTrackerQueuePrivate));
+}
+
+
+PhotosTrackerQueue *
+photos_tracker_queue_new (void)
+{
+  return g_object_new (PHOTOS_TYPE_TRACKER_QUEUE, NULL);
+}
+
+
+void
+photos_tracker_queue_select (PhotosTrackerQueue *self,
+                             const gchar *sparql,
+                             GCancellable *cancellable,
+                             GAsyncReadyCallback callback,
+                             gpointer user_data,
+                             GDestroyNotify destroy_data)
+{
+  PhotosTrackerQueueData *data;
+
+  if (cancellable != NULL)
+    g_object_ref (cancellable);
+
+  data = photos_tracker_queue_data_new (sparql,
+                                        PHOTOS_TRACKER_QUERY_SELECT,
+                                        cancellable,
+                                        callback,
+                                        user_data,
+                                        destroy_data);
+
+  g_queue_push_tail (self->priv->queue, data);
+  photos_tracker_queue_check (self);
+}
diff --git a/src/photos-tracker-queue.h b/src/photos-tracker-queue.h
new file mode 100644
index 0000000..a50730b
--- /dev/null
+++ b/src/photos-tracker-queue.h
@@ -0,0 +1,78 @@
+/*
+ * Photos - access, organize and share your photos on GNOME
+ * Copyright  2012 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef PHOTOS_TRACKER_QUEUE_H
+#define PHOTOS_TRACKER_QUEUE_H
+
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+#define PHOTOS_TYPE_TRACKER_QUEUE (photos_tracker_queue_get_type ())
+
+#define PHOTOS_TRACKER_QUEUE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+   PHOTOS_TYPE_TRACKER_QUEUE, PhotosTrackerQueue))
+
+#define PHOTOS_TRACKER_QUEUE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST ((klass), \
+   PHOTOS_TYPE_TRACKER_QUEUE, PhotosTrackerQueueClass))
+
+#define PHOTOS_IS_TRACKER_QUEUE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+   PHOTOS_TYPE_TRACKER_QUEUE))
+
+#define PHOTOS_IS_TRACKER_QUEUE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
+   PHOTOS_TYPE_TRACKER_QUEUE))
+
+#define PHOTOS_TRACKER_QUEUE_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
+   PHOTOS_TYPE_TRACKER_QUEUE, PhotosTrackerQueueClass))
+
+typedef struct _PhotosTrackerQueue        PhotosTrackerQueue;
+typedef struct _PhotosTrackerQueueClass   PhotosTrackerQueueClass;
+typedef struct _PhotosTrackerQueuePrivate PhotosTrackerQueuePrivate;
+
+struct _PhotosTrackerQueue
+{
+  GObject parent_instance;
+  PhotosTrackerQueuePrivate *priv;
+};
+
+struct _PhotosTrackerQueueClass
+{
+  GObjectClass parent_class;
+};
+
+GType                  photos_tracker_queue_get_type               (void) G_GNUC_CONST;
+
+PhotosTrackerQueue    *photos_tracker_queue_new                    (void);
+
+void                   photos_tracker_queue_select                 (PhotosTrackerQueue *self,
+                                                                    const gchar *sparql,
+                                                                    GCancellable *cancellable,
+                                                                    GAsyncReadyCallback callback,
+                                                                    gpointer user_data,
+                                                                    GDestroyNotify destroy_data);
+
+G_END_DECLS
+
+#endif /* PHOTOS_TRACKER_QUEUE_H */