[tracker] TrackerMinerManager: Add miner-[de]activated signals.

[Carlos Garnacho <carlosg src gnome org>]

commit a9c3b530e1bf486fba696eba945371a2596cb6ef
Author: Carlos Garnacho <carlos lanedo com>
Date:   Mon Sep 7 17:29:13 2009 +0200

    TrackerMinerManager: Add miner-[de]activated signals.
    
    These will monitor whether the miner is running and available through DBus.

 src/libtracker-miner/tracker-miner-manager.c |   80 ++++++++++++++++++++++++++
 src/libtracker-miner/tracker-miner-manager.h |    7 ++
 2 files changed, 87 insertions(+), 0 deletions(-)
---
diff --git a/src/libtracker-miner/tracker-miner-manager.c b/src/libtracker-miner/tracker-miner-manager.c
index 285fcf4..36d1e13 100644
--- a/src/libtracker-miner/tracker-miner-manager.c
+++ b/src/libtracker-miner/tracker-miner-manager.c
@@ -48,6 +48,8 @@ enum {
 	MINER_PROGRESS,
 	MINER_PAUSED,
 	MINER_RESUMED,
+	MINER_ACTIVATED,
+	MINER_DEACTIVATED,
 	LAST_SIGNAL
 };
 
@@ -89,6 +91,24 @@ tracker_miner_manager_class_init (TrackerMinerManagerClass *klass)
 			      g_cclosure_marshal_VOID__STRING,
 			      G_TYPE_NONE, 1,
 			      G_TYPE_STRING);
+	signals [MINER_ACTIVATED] =
+		g_signal_new ("miner-activated",
+			      G_OBJECT_CLASS_TYPE (object_class),
+			      G_SIGNAL_RUN_LAST,
+			      G_STRUCT_OFFSET (TrackerMinerManagerClass, miner_activated),
+			      NULL, NULL,
+			      g_cclosure_marshal_VOID__STRING,
+			      G_TYPE_NONE, 1,
+			      G_TYPE_STRING);
+	signals [MINER_DEACTIVATED] =
+		g_signal_new ("miner-deactivated",
+			      G_OBJECT_CLASS_TYPE (object_class),
+			      G_SIGNAL_RUN_LAST,
+			      G_STRUCT_OFFSET (TrackerMinerManagerClass, miner_deactivated),
+			      NULL, NULL,
+			      g_cclosure_marshal_VOID__STRING,
+			      G_TYPE_NONE, 1,
+			      G_TYPE_STRING);
 
 	g_type_class_add_private (object_class, sizeof (TrackerMinerManagerPrivate));
 }
@@ -114,6 +134,27 @@ find_miner_proxy (TrackerMinerManager *manager,
 }
 
 static void
+name_owner_changed_cb (DBusGProxy  *proxy,
+		       const gchar *name,
+		       const gchar *old_owner,
+		       const gchar *new_owner,
+		       gpointer     user_data)
+{
+	TrackerMinerManager *manager = user_data;
+	TrackerMinerManagerPrivate *priv;
+
+	priv = TRACKER_MINER_MANAGER_GET_PRIVATE (manager);
+
+	if (find_miner_proxy (manager, name) != NULL) {
+		if (new_owner && (!old_owner || !*old_owner)) {
+			g_signal_emit (manager, signals[MINER_ACTIVATED], 0, name);
+		} else if (old_owner && (!new_owner || !*new_owner)) {
+			g_signal_emit (manager, signals[MINER_DEACTIVATED], 0, name);
+		}
+	}
+}
+
+static void
 miner_progress_changed (DBusGProxy  *proxy,
 			const gchar *status,
 			gdouble      progress,
@@ -196,6 +237,18 @@ tracker_miner_manager_init (TrackerMinerManager *manager)
 					   G_TYPE_DOUBLE,
 					   G_TYPE_INVALID);
 
+	dbus_g_proxy_add_signal (priv->proxy,
+				 "NameOwnerChanged",
+				 G_TYPE_STRING,
+				 G_TYPE_STRING,
+				 G_TYPE_STRING,
+				 G_TYPE_INVALID);
+
+	dbus_g_proxy_connect_signal (priv->proxy,
+				     "NameOwnerChanged",
+				     G_CALLBACK (name_owner_changed_cb),
+				     manager, NULL);
+
 	miners = tracker_miner_manager_get_available (manager);
 
 	for (m = miners; m; m = m->next) {
@@ -443,3 +496,30 @@ tracker_miner_manager_resume (TrackerMinerManager *manager,
 
 	return TRUE;
 }
+
+gboolean
+tracker_miner_manager_is_active (TrackerMinerManager *manager,
+				 const gchar         *miner)
+{
+	TrackerMinerManagerPrivate *priv;
+	GError *error = NULL;
+	gboolean active;
+
+	g_return_val_if_fail (TRACKER_IS_MINER_MANAGER (manager), FALSE);
+	g_return_val_if_fail (miner != NULL, FALSE);
+
+	priv = TRACKER_MINER_MANAGER_GET_PRIVATE (manager);
+
+	if (!dbus_g_proxy_call (priv->proxy, "NameHasOwner", &error,
+				G_TYPE_STRING, miner,
+				G_TYPE_INVALID,
+				G_TYPE_BOOLEAN, &active,
+				G_TYPE_INVALID)) {
+		g_critical ("Could not check whether miner '%s' is currently active: %s",
+			    miner, error ? error->message : "no error given");
+		g_error_free (error);
+		return FALSE;
+	}
+
+	return active;
+}
diff --git a/src/libtracker-miner/tracker-miner-manager.h b/src/libtracker-miner/tracker-miner-manager.h
index 788f5c9..9d52353 100644
--- a/src/libtracker-miner/tracker-miner-manager.h
+++ b/src/libtracker-miner/tracker-miner-manager.h
@@ -50,6 +50,10 @@ struct TrackerMinerManagerClass {
 				 const gchar         *miner_name);
 	void (* miner_resumed)  (TrackerMinerManager *manager,
 				 const gchar         *miner_name);
+	void (* miner_activated)   (TrackerMinerManager *manager,
+				    const gchar         *miner_name);
+	void (* miner_deactivated) (TrackerMinerManager *manager,
+				    const gchar         *miner_name);
 };
 
 GType   tracker_miner_manager_get_type (void) G_GNUC_CONST;
@@ -67,6 +71,9 @@ gboolean tracker_miner_manager_resume (TrackerMinerManager *manager,
 				       const gchar         *miner,
 				       guint32              cookie);
 
+gboolean tracker_miner_manager_is_active (TrackerMinerManager *manager,
+					  const gchar         *miner);
+
 G_END_DECLS
 
 #endif /* __LIBTRACKERMINER_MANAGER_H__ */