_mcd_dispatch_operation_peek_channel: adapt from old _peek_channels

Now that the CDO can contain at most one channel, there's no need to
return a list.

https://bugs.freedesktop.org/show_bug.cgi?id=52305

4 files changed, 27 insertions, 21 deletions

diff --git a/src/mcd-dispatch-operation-priv.h b/src/mcd-dispatch-operation-priv.h
index 933c12a4..23ddb5d3 100644
--- a/src/mcd-dispatch-operation-priv.h
+++ b/src/mcd-dispatch-operation-priv.h
@@ -75,7 +75,7 @@ G_GNUC_INTERNAL McdDispatchOperation *_mcd_dispatch_operation_new (
 
 G_GNUC_INTERNAL gboolean _mcd_dispatch_operation_has_channel (
     McdDispatchOperation *self, McdChannel *channel);
-G_GNUC_INTERNAL const GList *_mcd_dispatch_operation_peek_channels (
+G_GNUC_INTERNAL McdChannel *_mcd_dispatch_operation_peek_channel (
     McdDispatchOperation *self);
 G_GNUC_INTERNAL GList *_mcd_dispatch_operation_dup_channels (
     McdDispatchOperation *self);
diff --git a/src/mcd-dispatch-operation.c b/src/mcd-dispatch-operation.c
index 17272276..dda2aa9c 100644
--- a/src/mcd-dispatch-operation.c
+++ b/src/mcd-dispatch-operation.c
@@ -1149,7 +1149,7 @@ mcd_dispatch_operation_channel_aborted_cb (McdChannel *channel,
 
     _mcd_dispatch_operation_lose_channel (self, channel);
 
-    if (_mcd_dispatch_operation_peek_channels (self) == NULL)
+    if (self->priv->channels == NULL)
     {
         DEBUG ("Nothing left in this context");
     }
@@ -1884,11 +1884,17 @@ _mcd_dispatch_operation_has_channel (McdDispatchOperation *self,
     return (g_list_find (self->priv->channels, channel) != NULL);
 }
 
-const GList *
-_mcd_dispatch_operation_peek_channels (McdDispatchOperation *self)
+McdChannel *
+_mcd_dispatch_operation_peek_channel (McdDispatchOperation *self)
 {
     g_return_val_if_fail (MCD_IS_DISPATCH_OPERATION (self), NULL);
-    return self->priv->channels;
+    g_return_val_if_fail (self->priv->channels == NULL ||
+                          self->priv->channels->next == NULL, NULL);
+
+    if (self->priv->channels == NULL)
+        return NULL;
+
+    return self->priv->channels->data;
 }
 
 GList *
diff --git a/src/mcd-dispatcher.c b/src/mcd-dispatcher.c
index 6fff70de..07d6f9af 100644
--- a/src/mcd-dispatcher.c
+++ b/src/mcd-dispatcher.c
@@ -314,7 +314,7 @@ _mcd_dispatcher_enter_state_machine (McdDispatcher *dispatcher,
             list = g_list_delete_link (list, list);
         }
     }
-    else if (_mcd_dispatch_operation_peek_channels (operation) == NULL)
+    else if (_mcd_dispatch_operation_peek_channel (operation) == NULL)
     {
         DEBUG ("No channels left");
     }
@@ -625,11 +625,11 @@ mcd_dispatcher_client_needs_recovery_cb (McdClientProxy *client,
 
         if (_mcd_dispatch_operation_has_invoked_observers (op))
         {
-            for (channels = _mcd_dispatch_operation_peek_channels (op);
-                 channels != NULL;
-                 channels = channels->next)
+            McdChannel *mcd_channel =
+                _mcd_dispatch_operation_peek_channel (op);
+
+            if (mcd_channel != NULL)
             {
-                McdChannel *mcd_channel = channels->data;
                 GHashTable *properties =
                     _mcd_channel_get_immutable_properties (mcd_channel);
 
diff --git a/src/plugin-dispatch-operation.c b/src/plugin-dispatch-operation.c
index 934e6dde..0281dbfc 100644
--- a/src/plugin-dispatch-operation.c
+++ b/src/plugin-dispatch-operation.c
@@ -178,9 +178,11 @@ plugin_do_get_n_channels (McpDispatchOperation *obj)
   McdPluginDispatchOperation *self = MCD_PLUGIN_DISPATCH_OPERATION (obj);
 
   g_return_val_if_fail (self != NULL, 0);
-  /* FIXME: O(n) */
-  return g_list_length ((GList *) _mcd_dispatch_operation_peek_channels (
-        self->real_cdo));
+
+  if (_mcd_dispatch_operation_peek_channel (self->real_cdo) != NULL)
+    return 1;
+
+  return 0;
 }
 
 static const gchar *
@@ -191,11 +193,10 @@ plugin_do_get_nth_channel_path (McpDispatchOperation *obj,
   McdChannel *channel;
 
   g_return_val_if_fail (self != NULL, NULL);
-  /* FIXME: O(n) */
-  channel = g_list_nth_data ((GList *) _mcd_dispatch_operation_peek_channels (
-        self->real_cdo), n);
 
-  if (channel == NULL)
+  channel = _mcd_dispatch_operation_peek_channel (self->real_cdo);
+
+  if (channel == NULL || n != 0)
     return NULL;
 
   return mcd_channel_get_object_path (channel);
@@ -210,11 +211,10 @@ plugin_do_ref_nth_channel_properties (McpDispatchOperation *obj,
   GHashTable *ret;
 
   g_return_val_if_fail (self != NULL, NULL);
-  /* FIXME: O(n) */
-  channel = g_list_nth_data ((GList *) _mcd_dispatch_operation_peek_channels (
-        self->real_cdo), n);
 
-  if (channel == NULL)
+  channel = _mcd_dispatch_operation_peek_channel (self->real_cdo);
+
+  if (channel == NULL || n != 0)
     return NULL;
 
   ret = _mcd_channel_get_immutable_properties (channel);