[folks] core: Unprepare all backends when destroying the BackendStore

[Philip Withnall <pwithnall src gnome org>]

commit 9064888b65eff3d30023bffebe5fa042a8e0369b
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Wed Nov 13 16:08:08 2013 +0000

    core: Unprepare all backends when destroying the BackendStore
    
    This helps free up some reference cycles (particularly in the BlueZ
    backend) and hence ensure no memory is leaked.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=712274

 folks/backend-store.vala |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/folks/backend-store.vala b/folks/backend-store.vala
index 4af4d20..e2ec287 100644
--- a/folks/backend-store.vala
+++ b/folks/backend-store.vala
@@ -158,6 +158,16 @@ public class Folks.BackendStore : Object {
 
   ~BackendStore ()
     {
+      /* Unprepare all existing backends. */
+      var iter = this._prepared_backends.map_iterator ();
+      while (iter.next () == true)
+        {
+          var backend = iter.get_value ();
+          backend.unprepare.begin ();
+        }
+
+      this._prepared_backends.clear ();
+
       /* Finalize all the loaded modules that have finalize functions */
       foreach (var module in this._modules.values)
         {
@@ -169,6 +179,8 @@ public class Folks.BackendStore : Object {
             }
         }
 
+      this._modules.clear ();
+
       /* Disconnect from the debug handler */
       this._debug.print_status.disconnect (this._debug_print_status);