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

[Matthew Barnes <mbarnes src gnome org>]

commit e392ee8624c77874e593f6499118bb5eefad1de6
Author: Matthew Barnes <mbarnes redhat com>
Date:   Fri Mar 8 09:32:21 2013 -0500

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

 addressbook/libebook/e-book-client-view.c |   86 +++++++++++++++++++---------
 1 files changed, 58 insertions(+), 28 deletions(-)
---
diff --git a/addressbook/libebook/e-book-client-view.c b/addressbook/libebook/e-book-client-view.c
index bd70369..c26dc38 100644
--- a/addressbook/libebook/e-book-client-view.c
+++ b/addressbook/libebook/e-book-client-view.c
@@ -58,7 +58,7 @@ struct _EBookClientViewPrivate {
 };
 
 struct _SignalClosure {
-       EBookClientView *client_view;
+       GWeakRef client_view;
        GSList *object_list;
        GSList *string_list;
        gchar *message;
@@ -105,7 +105,7 @@ typedef struct {
 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->object_list,
@@ -127,11 +127,17 @@ static gboolean
 book_client_view_emit_objects_added_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       EBookClientView *client_view;
 
-       g_signal_emit (
-               signal_closure->client_view,
-               signals[OBJECTS_ADDED], 0,
-               signal_closure->object_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->object_list);
+               g_object_unref (client_view);
+       }
 
        return FALSE;
 }
@@ -140,11 +146,17 @@ static gboolean
 book_client_view_emit_objects_modified_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       EBookClientView *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->object_list);
+       if (client_view != NULL) {
+               g_signal_emit (
+                       client_view,
+                       signals[OBJECTS_MODIFIED], 0,
+                       signal_closure->object_list);
+               g_object_unref (client_view);
+       }
 
        return FALSE;
 }
@@ -153,11 +165,17 @@ static gboolean
 book_client_view_emit_objects_removed_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       EBookClientView *client_view;
 
-       g_signal_emit (
-               signal_closure->client_view,
-               signals[OBJECTS_REMOVED], 0,
-               signal_closure->string_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->string_list);
+               g_object_unref (client_view);
+       }
 
        return FALSE;
 }
@@ -166,12 +184,18 @@ static gboolean
 book_client_view_emit_progress_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       EBookClientView *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;
 }
@@ -180,11 +204,17 @@ static gboolean
 book_client_view_emit_complete_idle_cb (gpointer user_data)
 {
        SignalClosure *signal_closure = user_data;
+       EBookClientView *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;
 }
@@ -199,7 +229,7 @@ book_client_view_emit_objects_added (EBookClientView *client_view,
        SignalClosure *signal_closure;
 
        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->object_list = object_list;  /* takes ownership */
 
        client = e_book_client_view_get_client (client_view);
@@ -227,7 +257,7 @@ book_client_view_emit_objects_modified (EBookClientView *client_view,
        SignalClosure *signal_closure;
 
        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->object_list = object_list;  /* takes ownership */
 
        client = e_book_client_view_get_client (client_view);
@@ -444,7 +474,7 @@ book_client_view_objects_removed_cb (EGdbusBookView *object,
                list = g_slist_prepend (list, g_strdup (ids[ii]));
 
        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->string_list = g_slist_reverse (list);
 
        client = e_book_client_view_get_client (client_view);
@@ -477,7 +507,7 @@ book_client_view_progress_cb (EGdbusBookView *object,
                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;
 
@@ -510,7 +540,7 @@ book_client_view_complete_cb (EGdbusBookView *object,
                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 (in_error_strv, &signal_closure->error);
 
        client = e_book_client_view_get_client (client_view);