[evolution-data-server] ECalClientView: Use weak references in signal closures.

[Matthew Barnes <mbarnes src gnome org>]

commit 520a9b836fa6f75a19a977d57286c701aeef21d7
Author: Matthew Barnes <mbarnes redhat com>
Date:   Fri Mar 8 09:43:59 2013 -0500

    ECalClientView: Use weak references in signal closures.
    
    Helps prevent the object from surviving beyond its natural life.

 calendar/libecal/e-cal-client-view.c |   86 +++++++++++++++++++++++-----------
 1 files changed, 58 insertions(+), 28 deletions(-)
---
diff --git a/calendar/libecal/e-cal-client-view.c b/calendar/libecal/e-cal-client-view.c
index 714c60f..ce48269 100644
--- a/calendar/libecal/e-cal-client-view.c
+++ b/calendar/libecal/e-cal-client-view.c
@@ -56,7 +56,7 @@ struct _ECalClientViewPrivate {
 };
 
 struct _SignalClosure {
-       ECalClientView *client_view;
+       GWeakRef client_view;
        GSList *component_list;
        GSList *component_id_list;
        gchar *message;
@@ -96,7 +96,7 @@ G_DEFINE_TYPE_WITH_CODE (
 static void
 signal_closure_free (SignalClosure *signal_closure)
 {
-       g_object_unref (signal_closure->client_view);
+       g_weak_ref_set (&signal_closure->client_view, NULL);
 
        g_slist_free_full (
                signal_closure->component_list,
@@ -167,11 +167,17 @@ static gboolean
 cal_client_view_emit_objects_added_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       ECalClientView *client_view;
 
-       g_signal_emit (
-               signal_closure->client_view,
-               signals[OBJECTS_ADDED], 0,
-               signal_closure->component_list);
+       client_view = g_weak_ref_get (&signal_closure->client_view);
+
+       if (client_view != NULL) {
+               g_signal_emit (
+                       client_view,
+                       signals[OBJECTS_ADDED], 0,
+                       signal_closure->component_list);
+               g_object_unref (client_view);
+       }
 
        return FALSE;
 }
@@ -180,11 +186,17 @@ static gboolean
 cal_client_view_emit_objects_modified_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       ECalClientView *client_view;
+
+       client_view = g_weak_ref_get (&signal_closure->client_view);
 
-       g_signal_emit (
-               signal_closure->client_view,
-               signals[OBJECTS_MODIFIED], 0,
-               signal_closure->component_list);
+       if (client_view != NULL) {
+               g_signal_emit (
+                       client_view,
+                       signals[OBJECTS_MODIFIED], 0,
+                       signal_closure->component_list);
+               g_object_unref (client_view);
+       }
 
        return FALSE;
 }
@@ -193,11 +205,17 @@ static gboolean
 cal_client_view_emit_objects_removed_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       ECalClientView *client_view;
 
-       g_signal_emit (
-               signal_closure->client_view,
-               signals[OBJECTS_REMOVED], 0,
-               signal_closure->component_id_list);
+       client_view = g_weak_ref_get (&signal_closure->client_view);
+
+       if (client_view != NULL) {
+               g_signal_emit (
+                       client_view,
+                       signals[OBJECTS_REMOVED], 0,
+                       signal_closure->component_id_list);
+               g_object_unref (client_view);
+       }
 
        return FALSE;
 }
@@ -206,12 +224,18 @@ static gboolean
 cal_client_view_emit_progress_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       ECalClientView *client_view;
+
+       client_view = g_weak_ref_get (&signal_closure->client_view);
 
-       g_signal_emit (
-               signal_closure->client_view,
-               signals[PROGRESS], 0,
-               signal_closure->percent,
-               signal_closure->message);
+       if (client_view != NULL) {
+               g_signal_emit (
+                       client_view,
+                       signals[PROGRESS], 0,
+                       signal_closure->percent,
+                       signal_closure->message);
+               g_object_unref (client_view);
+       }
 
        return FALSE;
 }
@@ -220,11 +244,17 @@ static gboolean
 cal_client_view_emit_complete_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       ECalClientView *client_view;
 
-       g_signal_emit (
-               signal_closure->client_view,
-               signals[COMPLETE], 0,
-               signal_closure->error);
+       client_view = g_weak_ref_get (&signal_closure->client_view);
+
+       if (client_view != NULL) {
+               g_signal_emit (
+                       client_view,
+                       signals[COMPLETE], 0,
+                       signal_closure->error);
+               g_object_unref (client_view);
+       }
 
        return FALSE;
 }
@@ -243,7 +273,7 @@ cal_client_view_objects_added_cb (EGdbusCalView *dbus_proxy,
                return;
 
        signal_closure = g_slice_new0 (SignalClosure);
-       signal_closure->client_view = g_object_ref (client_view);
+       g_weak_ref_set (&signal_closure->client_view, client_view);
        signal_closure->component_list = build_object_list (objects);
 
        client = e_cal_client_view_get_client (client_view);
@@ -275,7 +305,7 @@ cal_client_view_objects_modified_cb (EGdbusCalView *dbus_proxy,
                return;
 
        signal_closure = g_slice_new0 (SignalClosure);
-       signal_closure->client_view = g_object_ref (client_view);
+       g_weak_ref_set (&signal_closure->client_view, client_view);
        signal_closure->component_list = build_object_list (objects);
 
        client = e_cal_client_view_get_client (client_view);
@@ -307,7 +337,7 @@ cal_client_view_objects_removed_cb (EGdbusCalView *dbus_proxy,
                return;
 
        signal_closure = g_slice_new0 (SignalClosure);
-       signal_closure->client_view = g_object_ref (client_view);
+       g_weak_ref_set (&signal_closure->client_view, client_view);
        signal_closure->component_id_list = build_id_list (uids);
 
        client = e_cal_client_view_get_client (client_view);
@@ -340,7 +370,7 @@ cal_client_view_progress_cb (EGdbusCalView *dbus_proxy,
                return;
 
        signal_closure = g_slice_new0 (SignalClosure);
-       signal_closure->client_view = g_object_ref (client_view);
+       g_weak_ref_set (&signal_closure->client_view, client_view);
        signal_closure->message = g_strdup (message);
        signal_closure->percent = percent;
 
@@ -373,7 +403,7 @@ cal_client_view_complete_cb (EGdbusCalView *dbus_proxy,
                return;
 
        signal_closure = g_slice_new0 (SignalClosure);
-       signal_closure->client_view = g_object_ref (client_view);
+       g_weak_ref_set (&signal_closure->client_view, client_view);
        e_gdbus_templates_decode_error (arg_error, &signal_closure->error);
 
        client = e_cal_client_view_get_client (client_view);