[evolution-data-server] EBackend: Keep a reference on GNetworkMonitor.

[Matthew Barnes <mbarnes src gnome org>]

commit 1ca84586a44bc3d4cc0b7d0fe2f293f2e27b68d4
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sun Feb 17 20:14:25 2013 -0500

    EBackend: Keep a reference on GNetworkMonitor.
    
    Keep a strong reference on the default GNetworkMonitor, and connect to
    its "network-changed" signal.  Our signal handler does nothing for the
    moment, but shortly it will update the "online" state.

 libebackend/e-backend.c |   42 ++++++++++++++++++++++++++++++++----------
 1 files changed, 32 insertions(+), 10 deletions(-)
---
diff --git a/libebackend/e-backend.c b/libebackend/e-backend.c
index 8c36b0f..dc701d0 100644
--- a/libebackend/e-backend.c
+++ b/libebackend/e-backend.c
@@ -53,6 +53,9 @@ struct _EBackendPrivate {
        EUserPrompter *prompter;
        GSocketConnectable *connectable;
        gboolean online;
+
+       GNetworkMonitor *network_monitor;
+       gulong network_changed_handler_id;
 };
 
 struct _AsyncContext {
@@ -79,6 +82,14 @@ async_context_free (AsyncContext *async_context)
 }
 
 static void
+backend_network_changed_cb (GNetworkMonitor *network_monitor,
+                            gboolean network_available,
+                            EBackend *backend)
+{
+       /* Do nothing for the moment. */
+}
+
+static void
 backend_set_source (EBackend *backend,
                     ESource *source)
 {
@@ -159,9 +170,17 @@ backend_dispose (GObject *object)
 
        priv = E_BACKEND_GET_PRIVATE (object);
 
+       if (priv->network_changed_handler_id > 0) {
+               g_signal_handler_disconnect (
+                       priv->network_monitor,
+                       priv->network_changed_handler_id);
+               priv->network_changed_handler_id = 0;
+       }
+
        g_clear_object (&priv->source);
        g_clear_object (&priv->prompter);
        g_clear_object (&priv->connectable);
+       g_clear_object (&priv->network_monitor);
 
        /* Chain up to parent's dispose() method. */
        G_OBJECT_CLASS (e_backend_parent_class)->dispose (object);
@@ -185,7 +204,6 @@ backend_constructed (GObject *object)
 {
        EBackend *backend;
        ESource *source;
-       GNetworkMonitor *monitor;
        const gchar *extension_name;
 
        backend = E_BACKEND (object);
@@ -220,15 +238,6 @@ backend_constructed (GObject *object)
 
                g_free (host);
        }
-
-       /* Synchronize network monitoring. */
-
-       monitor = g_network_monitor_get_default ();
-
-       g_object_bind_property (
-               monitor, "network-available",
-               object, "online",
-               G_BINDING_SYNC_CREATE);
 }
 
 static void
@@ -390,10 +399,23 @@ e_backend_class_init (EBackendClass *class)
 static void
 e_backend_init (EBackend *backend)
 {
+       GNetworkMonitor *network_monitor;
+       gulong handler_id;
+
        backend->priv = E_BACKEND_GET_PRIVATE (backend);
        backend->priv->prompter = e_user_prompter_new ();
 
        g_mutex_init (&backend->priv->property_lock);
+
+       /* Configure network monitoring. */
+
+       network_monitor = g_network_monitor_get_default ();
+       backend->priv->network_monitor = g_object_ref (network_monitor);
+
+       handler_id = g_signal_connect (
+               backend->priv->network_monitor, "network-changed",
+               G_CALLBACK (backend_network_changed_cb), backend);
+       backend->priv->network_changed_handler_id = handler_id;
 }
 
 /**