Replace orddicts with maps

8 files changed, 71 insertions, 72 deletions

diff --git a/src/gm.erl b/src/gm.erl
index 0da190a57d..c53e9bb007 100644
--- a/src/gm.erl
+++ b/src/gm.erl
@@ -399,7 +399,6 @@
 -define(FORCE_GC_TIMER, 250).
 -define(VERSION_START, 0).
 -define(SETS, ordsets).
--define(DICT, orddict).
 
 -record(state,
         { self,
@@ -824,8 +823,8 @@ handle_msg({catchup, Left, MembersStateLeft},
                             members_state = MembersState })
   when MembersState =/= undefined ->
     MembersStateLeft1 = build_members_state(MembersStateLeft),
-    AllMembers = lists:usort(?DICT:fetch_keys(MembersState) ++
-                                 ?DICT:fetch_keys(MembersStateLeft1)),
+    AllMembers = lists:usort(maps:keys(MembersState) ++
+                                 maps:keys(MembersStateLeft1)),
     {MembersState1, Activity} =
         lists:foldl(
           fun (Id, MembersStateActivity) ->
@@ -995,21 +994,21 @@ is_member_alias(Member, Self, View) ->
 dead_member_id({dead, Member}) -> Member.
 
 store_view_member(VMember = #view_member { id = Id }, {Ver, View}) ->
-    {Ver, ?DICT:store(Id, VMember, View)}.
+    {Ver, maps:put(Id, VMember, View)}.
 
 with_view_member(Fun, View, Id) ->
     store_view_member(Fun(fetch_view_member(Id, View)), View).
 
-fetch_view_member(Id, {_Ver, View}) -> ?DICT:fetch(Id, View).
+fetch_view_member(Id, {_Ver, View}) -> maps:get(Id, View).
 
-find_view_member(Id, {_Ver, View}) -> ?DICT:find(Id, View).
+find_view_member(Id, {_Ver, View}) -> maps:find(Id, View).
 
-blank_view(Ver) -> {Ver, ?DICT:new()}.
+blank_view(Ver) -> {Ver, maps:new()}.
 
-alive_view_members({_Ver, View}) -> ?DICT:fetch_keys(View).
+alive_view_members({_Ver, View}) -> maps:keys(View).
 
 all_known_members({_Ver, View}) ->
-    ?DICT:fold(
+    maps:fold(
        fun (Member, #view_member { aliases = Aliases }, Acc) ->
                ?SETS:to_list(Aliases) ++ [Member | Acc]
        end, [], View).
@@ -1374,24 +1373,24 @@ with_member_acc(Fun, Id, {MembersState, Acc}) ->
     {store_member(Id, MemberState, MembersState), Acc1}.
 
 find_member_or_blank(Id, MembersState) ->
-    case ?DICT:find(Id, MembersState) of
+    case maps:find(Id, MembersState) of
         {ok, Result} -> Result;
         error        -> blank_member()
     end.
 
-erase_member(Id, MembersState) -> ?DICT:erase(Id, MembersState).
+erase_member(Id, MembersState) -> maps:remove(Id, MembersState).
 
 blank_member() ->
     #member { pending_ack = queue:new(), last_pub = -1, last_ack = -1 }.
 
-blank_member_state() -> ?DICT:new().
+blank_member_state() -> maps:new().
 
 store_member(Id, MemberState, MembersState) ->
-    ?DICT:store(Id, MemberState, MembersState).
+    maps:put(Id, MemberState, MembersState).
 
-prepare_members_state(MembersState) -> ?DICT:to_list(MembersState).
+prepare_members_state(MembersState) -> maps:to_list(MembersState).
 
-build_members_state(MembersStateList) -> ?DICT:from_list(MembersStateList).
+build_members_state(MembersStateList) -> maps:from_list(MembersStateList).
 
 make_member(GroupName) ->
    {case dirty_read_group(GroupName) of
diff --git a/src/rabbit_limiter.erl b/src/rabbit_limiter.erl
index e81b10a555..93bacc568d 100644
--- a/src/rabbit_limiter.erl
+++ b/src/rabbit_limiter.erl
@@ -184,7 +184,7 @@
               %% 'Notify' is a boolean that indicates whether a queue should be
               %% notified of a change in the limit or volume that may allow it to
               %% deliver more messages via the limiter's channel.
-              queues = orddict:new(), % QPid -> {MonitorRef, Notify}
+              queues = maps:new(), % QPid -> {MonitorRef, Notify}
               volume = 0}).
 
 %% mode is of type credit_mode()
@@ -402,28 +402,28 @@ prefetch_limit_reached(#lim{prefetch_count = Limit, volume = Volume}) ->
     Limit =/= 0 andalso Volume >= Limit.
 
 remember_queue(QPid, State = #lim{queues = Queues}) ->
-    case orddict:is_key(QPid, Queues) of
+    case maps:is_key(QPid, Queues) of
         false -> MRef = erlang:monitor(process, QPid),
-                 State#lim{queues = orddict:store(QPid, {MRef, false}, Queues)};
+                 State#lim{queues = maps:put(QPid, {MRef, false}, Queues)};
         true  -> State
     end.
 
 forget_queue(QPid, State = #lim{queues = Queues}) ->
-    case orddict:find(QPid, Queues) of
+    case maps:find(QPid, Queues) of
         {ok, {MRef, _}} -> true = erlang:demonitor(MRef),
-                           State#lim{queues = orddict:erase(QPid, Queues)};
+                           State#lim{queues = maps:remove(QPid, Queues)};
         error           -> State
     end.
 
 limit_queue(QPid, State = #lim{queues = Queues}) ->
     UpdateFun = fun ({MRef, _}) -> {MRef, true} end,
-    State#lim{queues = orddict:update(QPid, UpdateFun, Queues)}.
+    State#lim{queues = maps:update_with(QPid, UpdateFun, Queues)}.
 
 notify_queues(State = #lim{ch_pid = ChPid, queues = Queues}) ->
     {QList, NewQueues} =
-        orddict:fold(fun (_QPid, {_, false}, Acc) -> Acc;
+        maps:fold(fun (_QPid, {_, false}, Acc) -> Acc;
                          (QPid, {MRef, true}, {L, D}) ->
-                             {[QPid | L], orddict:store(QPid, {MRef, false}, D)}
+                             {[QPid | L], maps:put(QPid, {MRef, false}, D)}
                      end, {[], Queues}, Queues),
     case length(QList) of
         0 -> ok;
diff --git a/src/rabbit_msg_store.erl b/src/rabbit_msg_store.erl
index fe78075d0f..76976ad771 100644
--- a/src/rabbit_msg_store.erl
+++ b/src/rabbit_msg_store.erl
@@ -780,7 +780,7 @@ init([Type, BaseDir, ClientRefs, StartupFunState]) ->
                        sync_timer_ref         = undefined,
                        sum_valid_data         = 0,
                        sum_file_size          = 0,
-                       pending_gc_completion  = orddict:new(),
+                       pending_gc_completion  = maps:new(),
                        gc_pid                 = GCPid,
                        file_handles_ets       = FileHandlesEts,
                        file_summary_ets       = FileSummaryEts,
@@ -1269,7 +1269,7 @@ contains_message(MsgId, From,
             gen_server2:reply(From, false),
             State;
         #msg_location { file = File } ->
-            case orddict:is_key(File, Pending) of
+            case maps:is_key(File, Pending) of
                 true  -> add_to_pending_gc_completion(
                            {contains, MsgId, From}, File, State);
                 false -> gen_server2:reply(From, true),
@@ -1280,16 +1280,16 @@ contains_message(MsgId, From,
 add_to_pending_gc_completion(
   Op, File, State = #msstate { pending_gc_completion = Pending }) ->
     State #msstate { pending_gc_completion =
-                         rabbit_misc:orddict_cons(File, Op, Pending) }.
+                         rabbit_misc:maps_cons(File, Op, Pending) }.
 
 run_pending(Files, State) ->
     lists:foldl(
       fun (File, State1 = #msstate { pending_gc_completion = Pending }) ->
-              Pending1 = orddict:erase(File, Pending),
+              Pending1 = maps:remove(File, Pending),
               lists:foldl(
                 fun run_pending_action/2,
                 State1 #msstate { pending_gc_completion = Pending1 },
-                lists:reverse(orddict:fetch(File, Pending)))
+                lists:reverse(maps:get(File, Pending)))
       end, State, Files).
 
 run_pending_action({read, MsgId, From}, State) ->
@@ -1320,9 +1320,9 @@ adjust_valid_total_size(File, Delta, State = #msstate {
                              [{#file_summary.valid_total_size, Delta}]),
     State #msstate { sum_valid_data = SumValid + Delta }.
 
-orddict_store(Key, Val, Dict) ->
-    false = orddict:is_key(Key, Dict),
-    orddict:store(Key, Val, Dict).
+maps_store(Key, Val, Dict) ->
+    false = maps:is_key(Key, Dict),
+    maps:put(Key, Val, Dict).
 
 update_pending_confirms(Fun, CRef,
                         State = #msstate { clients         = Clients,
@@ -1860,7 +1860,7 @@ maybe_compact(State = #msstate { sum_valid_data        = SumValid,
     %% complete traversal of FileSummaryEts.
     First = ets:first(FileSummaryEts),
     case First =:= '$end_of_table' orelse
-        orddict:size(Pending) >= ?MAXIMUM_SIMULTANEOUS_GC_FILES of
+        maps:size(Pending) >= ?MAXIMUM_SIMULTANEOUS_GC_FILES of
         true ->
             State;
         false ->
@@ -1869,8 +1869,8 @@ maybe_compact(State = #msstate { sum_valid_data        = SumValid,
                 not_found ->
                     State;
                 {Src, Dst} ->
-                    Pending1 = orddict_store(Dst, [],
-                                             orddict_store(Src, [], Pending)),
+                    Pending1 = maps_store(Dst, [],
+                                             maps_store(Src, [], Pending)),
                     State1 = close_handle(Src, close_handle(Dst, State)),
                     true = ets:update_element(FileSummaryEts, Src,
                                               {#file_summary.locked, true}),
@@ -1926,7 +1926,7 @@ delete_file_if_empty(File, State = #msstate {
         0 -> true = ets:update_element(FileSummaryEts, File,
                                        {#file_summary.locked, true}),
              ok = rabbit_msg_store_gc:delete(GCPid, File),
-             Pending1 = orddict_store(File, [], Pending),
+             Pending1 = maps_store(File, [], Pending),
              close_handle(File,
                           State #msstate { pending_gc_completion = Pending1 });
         _ -> State
diff --git a/src/rabbit_node_monitor.erl b/src/rabbit_node_monitor.erl
index 8bf79f7130..565676af3c 100644
--- a/src/rabbit_node_monitor.erl
+++ b/src/rabbit_node_monitor.erl
@@ -350,7 +350,7 @@ init([]) ->
                                        subscribers = pmon:new(),
                                        partitions  = [],
                                        guid        = rabbit_guid:gen(),
-                                       node_guids  = orddict:new(),
+                                       node_guids  = maps:new(),
                                        autoheal    = rabbit_autoheal:init()})}.
 
 handle_call(partitions, _From, State = #state{partitions = Partitions}) ->
@@ -405,17 +405,17 @@ handle_cast({node_up, Node, NodeType, GUID},
             State = #state{guid       = MyGUID,
                            node_guids = GUIDs}) ->
     cast(Node, {announce_guid, node(), MyGUID}),
-    GUIDs1 = orddict:store(Node, GUID, GUIDs),
+    GUIDs1 = maps:put(Node, GUID, GUIDs),
     handle_cast({node_up, Node, NodeType}, State#state{node_guids = GUIDs1});
 
 handle_cast({announce_guid, Node, GUID}, State = #state{node_guids = GUIDs}) ->
-    {noreply, State#state{node_guids = orddict:store(Node, GUID, GUIDs)}};
+    {noreply, State#state{node_guids = maps:put(Node, GUID, GUIDs)}};
 
 handle_cast({check_partial_partition, Node, Rep, NodeGUID, MyGUID, RepGUID},
             State = #state{guid       = MyGUID,
                            node_guids = GUIDs}) ->
     case lists:member(Node, rabbit_mnesia:cluster_nodes(running)) andalso
-        orddict:find(Node, GUIDs) =:= {ok, NodeGUID} of
+        maps:find(Node, GUIDs) =:= {ok, NodeGUID} of
         true  -> spawn_link( %%[1]
                    fun () ->
                            case rpc:call(Node, rabbit, is_running, []) of
@@ -560,10 +560,10 @@ handle_info({nodedown, Node, Info}, State = #state{guid       = MyGUID,
                     cast(N, {check_partial_partition,
                              Node, node(), DownGUID, CheckGUID, MyGUID})
             end,
-    case orddict:find(Node, GUIDs) of
+    case maps:find(Node, GUIDs) of
         {ok, DownGUID} -> Alive = rabbit_mnesia:cluster_nodes(running)
                               -- [node(), Node],
-                          [case orddict:find(N, GUIDs) of
+                          [case maps:find(N, GUIDs) of
                                {ok, CheckGUID} -> Check(N, CheckGUID, DownGUID);
                                error           -> ok
                            end || N <- Alive];
diff --git a/src/rabbit_priority_queue.erl b/src/rabbit_priority_queue.erl
index 41e65e8a1f..9f9ef5adca 100644
--- a/src/rabbit_priority_queue.erl
+++ b/src/rabbit_priority_queue.erl
@@ -207,13 +207,13 @@ publish(Msg, MsgProps, IsDelivered, ChPid, Flow,
     ?passthrough1(publish(Msg, MsgProps, IsDelivered, ChPid, Flow, BQS)).
 
 batch_publish(Publishes, ChPid, Flow, State = #state{bq = BQ, bqss = [{MaxP, _} |_]}) ->
-    PubDict = partition_publish_batch(Publishes, MaxP),
+    PubMap = partition_publish_batch(Publishes, MaxP),
     lists:foldl(
       fun ({Priority, Pubs}, St) ->
               pick1(fun (_P, BQSN) ->
                             BQ:batch_publish(Pubs, ChPid, Flow, BQSN)
                     end, Priority, St)
-      end, State, orddict:to_list(PubDict));
+      end, State, maps:to_list(PubMap));
 batch_publish(Publishes, ChPid, Flow,
               State = #passthrough{bq = BQ, bqs = BQS}) ->
     ?passthrough1(batch_publish(Publishes, ChPid, Flow, BQS)).
@@ -229,7 +229,7 @@ publish_delivered(Msg, MsgProps, ChPid, Flow,
     ?passthrough2(publish_delivered(Msg, MsgProps, ChPid, Flow, BQS)).
 
 batch_publish_delivered(Publishes, ChPid, Flow, State = #state{bq = BQ, bqss = [{MaxP, _} |_]}) ->
-    PubDict = partition_publish_delivered_batch(Publishes, MaxP),
+    PubMap = partition_publish_delivered_batch(Publishes, MaxP),
     {PrioritiesAndAcks, State1} =
         lists:foldl(
           fun ({Priority, Pubs}, {PriosAndAcks, St}) ->
@@ -241,7 +241,7 @@ batch_publish_delivered(Publishes, ChPid, Flow, State = #state{bq = BQ, bqss = [
                                     {priority_on_acktags(P, AckTags), BQSN1}
                             end, Priority, St),
                   {[PriosAndAcks1 | PriosAndAcks], St1}
-          end, {[], State}, orddict:to_list(PubDict)),
+          end, {[], State}, maps:to_list(PubMap)),
     {lists:reverse(PrioritiesAndAcks), State1};
 batch_publish_delivered(Publishes, ChPid, Flow,
                         State = #passthrough{bq = BQ, bqs = BQS}) ->
@@ -327,7 +327,7 @@ ackfold(MsgFun, Acc, State = #state{bq = BQ}, AckTags) ->
     AckTagsByPriority = partition_acktags(AckTags),
     fold2(
       fun (P, BQSN, AccN) ->
-              case orddict:find(P, AckTagsByPriority) of
+              case maps:find(P, AckTagsByPriority) of
                   {ok, ATagsN} -> {AccN1, BQSN1} =
                                       BQ:ackfold(MsgFun, AccN, BQSN, ATagsN),
                                   {priority_on_acktags(P, AccN1), BQSN1};
@@ -439,7 +439,7 @@ zip_msgs_and_acks(Msgs, AckTags, Accumulator, #state{bqss = [{MaxP, _} |_]}) ->
     MsgsByPriority = partition_publish_delivered_batch(Msgs, MaxP),
     lists:foldl(fun (Acks, MAs) ->
                         {P, _AckTag} = hd(Acks),
-                        Pubs = orddict:fetch(P, MsgsByPriority),
+                        Pubs = maps:get(P, MsgsByPriority),
                         MAs0 = zip_msgs_and_acks(Pubs, Acks),
                         MAs ++ MAs0
                 end, Accumulator, AckTags);
@@ -527,7 +527,7 @@ fold_min2(Fun, State) ->
 fold_by_acktags2(Fun, AckTags, State) ->
     AckTagsByPriority = partition_acktags(AckTags),
     fold_append2(fun (P, BQSN) ->
-                         case orddict:find(P, AckTagsByPriority) of
+                         case maps:find(P, AckTagsByPriority) of
                              {ok, AckTagsN} -> Fun(AckTagsN, BQSN);
                              error          -> {[], BQSN}
                          end
@@ -597,11 +597,11 @@ partition_publishes(Publishes, ExtractMsg, MaxP) ->
     Partitioned =
         lists:foldl(fun (Pub, Dict) ->
                             Msg = ExtractMsg(Pub),
-                            rabbit_misc:orddict_cons(priority(Msg, MaxP), Pub, Dict)
-                    end, orddict:new(), Publishes),
-    orddict:map(fun (_P, RevPubs) ->
-                        lists:reverse(RevPubs)
-                end, Partitioned).
+                            rabbit_misc:maps_cons(priority(Msg, MaxP), Pub, Dict)
+                    end, maps:new(), Publishes),
+    maps:map(fun (_P, RevPubs) ->
+                 lists:reverse(RevPubs)
+             end, Partitioned).
 
 
 priority_bq(Priority, [{MaxP, _} | _] = BQSs) ->
@@ -625,14 +625,14 @@ add_maybe_infinity(infinity, _) -> infinity;
 add_maybe_infinity(_, infinity) -> infinity;
 add_maybe_infinity(A, B)        -> A + B.
 
-partition_acktags(AckTags) -> partition_acktags(AckTags, orddict:new()).
+partition_acktags(AckTags) -> partition_acktags(AckTags, maps:new()).
 
 partition_acktags([], Partitioned) ->
-    orddict:map(fun (_P, RevAckTags) ->
-                        lists:reverse(RevAckTags)
-                end, Partitioned);
+    maps:map(fun (_P, RevAckTags) ->
+                 lists:reverse(RevAckTags)
+             end, Partitioned);
 partition_acktags([{P, AckTag} | Rest], Partitioned) ->
-    partition_acktags(Rest, rabbit_misc:orddict_cons(P, AckTag, Partitioned)).
+    partition_acktags(Rest, rabbit_misc:maps_cons(P, AckTag, Partitioned)).
 
 priority_on_acktags(P, AckTags) ->
     [case Tag of
diff --git a/src/rabbit_queue_consumers.erl b/src/rabbit_queue_consumers.erl
index f13a46fcf3..0fe3065fe8 100644
--- a/src/rabbit_queue_consumers.erl
+++ b/src/rabbit_queue_consumers.erl
@@ -254,9 +254,9 @@ subtract_acks(ChPid, AckTags, State) ->
             not_found;
         C = #cr{acktags = ChAckTags, limiter = Lim} ->
             {CTagCounts, AckTags2} = subtract_acks(
-                                       AckTags, [], orddict:new(), ChAckTags),
+                                       AckTags, [], maps:new(), ChAckTags),
             {Unblocked, Lim2} =
-                orddict:fold(
+                maps:fold(
                   fun (CTag, Count, {UnblockedN, LimN}) ->
                           {Unblocked1, LimN1} =
                               rabbit_limiter:ack_from_queue(LimN, CTag, Count),
@@ -278,7 +278,7 @@ subtract_acks([T | TL] = AckTags, Prefix, CTagCounts, AckQ) ->
     case queue:out(AckQ) of
         {{value, {T, CTag}}, QTail} ->
             subtract_acks(TL, Prefix,
-                          orddict:update_counter(CTag, 1, CTagCounts), QTail);
+                          maps:update_with(CTag, fun (Old) -> Old + 1 end, 1, CTagCounts), QTail);
         {{value, V}, QTail} ->
             subtract_acks(AckTags, [V | Prefix], CTagCounts, QTail);
         {empty, _} ->
diff --git a/src/rabbit_variable_queue.erl b/src/rabbit_variable_queue.erl
index 763e1efdad..49f4d8d3ed 100644
--- a/src/rabbit_variable_queue.erl
+++ b/src/rabbit_variable_queue.erl
@@ -1776,7 +1776,7 @@ remove_queue_entries(Q, DelsAndAcksFun,
                      State = #vqstate{msg_store_clients = MSCState}) ->
     {MsgIdsByStore, Delivers, Acks, State1} =
         ?QUEUE:foldl(fun remove_queue_entries1/2,
-                     {orddict:new(), [], [], State}, Q),
+                     {maps:new(), [], [], State}, Q),
     remove_msgs_by_id(MsgIdsByStore, MSCState),
     DelsAndAcksFun(Delivers, Acks, State1).
 
@@ -1786,7 +1786,7 @@ remove_queue_entries1(
                 is_persistent = IsPersistent} = MsgStatus,
   {MsgIdsByStore, Delivers, Acks, State}) ->
     {case MsgInStore of
-         true  -> rabbit_misc:orddict_cons(IsPersistent, MsgId, MsgIdsByStore);
+         true  -> rabbit_misc:maps_cons(IsPersistent, MsgId, MsgIdsByStore);
          false -> MsgIdsByStore
      end,
      cons_if(IndexOnDisk andalso not IsDelivered, SeqId, Delivers),
@@ -2143,27 +2143,27 @@ purge_pending_ack1(State = #vqstate { ram_pending_ack   = RPA,
                               qi_pending_ack   = gb_trees:empty()},
     {IndexOnDiskSeqIds, MsgIdsByStore, State1}.
 
-%% MsgIdsByStore is an orddict with two keys:
+%% MsgIdsByStore is an map with two keys:
 %%
 %% true: holds a list of Persistent Message Ids.
 %% false: holds a list of Transient Message Ids.
 %%
-%% When we call orddict:to_list/1 we get two sets of msg ids, where
+%% When we call maps:to_list/1 we get two sets of msg ids, where
 %% IsPersistent is either true for persistent messages or false for
 %% transient ones. The msg_store_remove/3 function takes this boolean
 %% flag to determine from which store the messages should be removed
 %% from.
 remove_msgs_by_id(MsgIdsByStore, MSCState) ->
     [ok = msg_store_remove(MSCState, IsPersistent, MsgIds)
-     || {IsPersistent, MsgIds} <- orddict:to_list(MsgIdsByStore)].
+     || {IsPersistent, MsgIds} <- maps:to_list(MsgIdsByStore)].
 
 remove_transient_msgs_by_id(MsgIdsByStore, MSCState) ->
-    case orddict:find(false, MsgIdsByStore) of
+    case maps:find(false, MsgIdsByStore) of
         error        -> ok;
         {ok, MsgIds} -> ok = msg_store_remove(MSCState, false, MsgIds)
     end.
 
-accumulate_ack_init() -> {[], orddict:new(), []}.
+accumulate_ack_init() -> {[], maps:new(), []}.
 
 accumulate_ack(#msg_status { seq_id        = SeqId,
                              msg_id        = MsgId,
@@ -2173,7 +2173,7 @@ accumulate_ack(#msg_status { seq_id        = SeqId,
                {IndexOnDiskSeqIdsAcc, MsgIdsByStore, AllMsgIds}) ->
     {cons_if(IndexOnDisk, SeqId, IndexOnDiskSeqIdsAcc),
      case MsgInStore of
-         true  -> rabbit_misc:orddict_cons(IsPersistent, MsgId, MsgIdsByStore);
+         true  -> rabbit_misc:maps_cons(IsPersistent, MsgId, MsgIdsByStore);
          false -> MsgIdsByStore
      end,
      [MsgId | AllMsgIds]}.
diff --git a/src/rabbit_version.erl b/src/rabbit_version.erl
index 3d69040b04..710e89922e 100644
--- a/src/rabbit_version.erl
+++ b/src/rabbit_version.erl
@@ -197,10 +197,10 @@ categorise_by_scope(Version) when is_list(Version) ->
                               rabbit_misc:all_module_attributes(rabbit_upgrade),
                           {Name, Scope, _Requires} <- Attributes,
                           lists:member(Name, Version)],
-    orddict:to_list(
+    maps:to_list(
       lists:foldl(fun ({Scope, Name}, CatVersion) ->
-                          rabbit_misc:orddict_cons(Scope, Name, CatVersion)
-                  end, orddict:new(), Categorised)).
+                          rabbit_misc:maps_cons(Scope, Name, CatVersion)
+                  end, maps:new(), Categorised)).
 
 dir() -> rabbit_mnesia:dir().