[tracker/direct-access: 18/40] libtracker-data: Add experimental support for async cursors

[Jürg Billeter <juergbi src gnome org>]

commit b7fde2a1d982a2d555f47f8942c02fb37b4b25b7
Author: Jürg Billeter <j bitron ch>
Date:   Tue Jul 13 18:46:06 2010 +0200

    libtracker-data: Add experimental support for async cursors

 src/libtracker-data/tracker-db-interface-sqlite.c |   43 +++++++++++++++++++++
 1 files changed, 43 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-data/tracker-db-interface-sqlite.c b/src/libtracker-data/tracker-db-interface-sqlite.c
index 9b6c9b1..0a95f74 100644
--- a/src/libtracker-data/tracker-db-interface-sqlite.c
+++ b/src/libtracker-data/tracker-db-interface-sqlite.c
@@ -1072,6 +1072,47 @@ tracker_db_cursor_finalize (GObject *object)
 }
 
 static void
+tracker_db_cursor_iter_next_thread (GSimpleAsyncResult *res,
+                                    GObject            *object,
+                                    GCancellable       *cancellable)
+{
+	/* run in thread */
+
+	GError *error = NULL;
+	gboolean result;
+
+	result = tracker_db_cursor_iter_next (TRACKER_DB_CURSOR (object), cancellable, &error);
+	if (error) {
+		g_simple_async_result_set_from_error (res, error);
+	} else {
+		g_simple_async_result_set_op_res_gboolean (res, result);
+	}
+}
+
+static void
+tracker_db_cursor_iter_next_async (TrackerDBCursor     *cursor,
+                                   GCancellable        *cancellable,
+                                   GAsyncReadyCallback  callback,
+                                   gpointer             user_data)
+{
+	GSimpleAsyncResult *res;
+
+	res = g_simple_async_result_new (G_OBJECT (cursor), callback, user_data, tracker_db_cursor_iter_next_async);
+	g_simple_async_result_run_in_thread (res, tracker_db_cursor_iter_next_thread, 0, cancellable);
+}
+
+static gboolean
+tracker_db_cursor_iter_next_finish (TrackerDBCursor  *cursor,
+                                    GAsyncResult     *res,
+                                    GError          **error)
+{
+	if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error)) {
+		return FALSE;
+	}
+	return g_simple_async_result_get_op_res_gboolean (G_SIMPLE_ASYNC_RESULT (res));
+}
+
+static void
 tracker_db_cursor_class_init (TrackerDBCursorClass *class)
 {
 	GObjectClass *object_class = G_OBJECT_CLASS (class);
@@ -1082,6 +1123,8 @@ tracker_db_cursor_class_init (TrackerDBCursorClass *class)
 	sparql_cursor_class->get_n_columns = (gint (*) (TrackerSparqlCursor *)) tracker_db_cursor_get_n_columns;
 	sparql_cursor_class->get_string = (const gchar * (*) (TrackerSparqlCursor *, gint, gint*)) tracker_db_cursor_get_string;
 	sparql_cursor_class->next = (gboolean (*) (TrackerSparqlCursor *, GCancellable *, GError **)) tracker_db_cursor_iter_next;
+	sparql_cursor_class->next_async = (void (*) (TrackerSparqlCursor *, GCancellable *, GAsyncReadyCallback, gpointer)) tracker_db_cursor_iter_next_async;
+	sparql_cursor_class->next_finish = (gboolean (*) (TrackerSparqlCursor *, GAsyncResult *, GError **)) tracker_db_cursor_iter_next_finish;
 	sparql_cursor_class->rewind = (void (*) (TrackerSparqlCursor *)) tracker_db_cursor_rewind;
 }