From f1e03821a9b62e1f28ffddf0a4ee4fa31006461b Mon Sep 17 00:00:00 2001
From: Matthias Radestock <matthias@rabbitmq.com>
Date: Thu, 15 Nov 2012 13:53:46 +0000
Subject: refactor stats recording in channel - specify stats type explicitly
 rather than inferring it from the   structure of the key (yuck!) -
 s/maybe_incr_stats/incr_stats

---
 src/rabbit_channel.erl | 64 +++++++++++++++++++++++---------------------------
 1 file changed, 29 insertions(+), 35 deletions(-)

diff --git a/src/rabbit_channel.erl b/src/rabbit_channel.erl
index 53610e6d..9dbfbdea 100644
--- a/src/rabbit_channel.erl
+++ b/src/rabbit_channel.erl
@@ -1236,14 +1236,14 @@ record_sent(ConsumerTag, AckRequired,
             State = #ch{unacked_message_q = UAMQ,
                         next_tag          = DeliveryTag,
                         trace_state       = TraceState}) ->
-    maybe_incr_stats([{QPid, 1}], case {ConsumerTag, AckRequired} of
-                                      {none,  true} -> get;
-                                      {none, false} -> get_no_ack;
-                                      {_   ,  true} -> deliver;
-                                      {_   , false} -> deliver_no_ack
-                                  end, State),
+    incr_stats([{queue_stats, QPid, 1}], case {ConsumerTag, AckRequired} of
+                                             {none,  true} -> get;
+                                             {none, false} -> get_no_ack;
+                                             {_   ,  true} -> deliver;
+                                             {_   , false} -> deliver_no_ack
+                                         end, State),
     case Redelivered of
-        true  -> maybe_incr_stats([{QPid, 1}], redeliver, State);
+        true  -> incr_stats([{queue_stats, QPid, 1}], redeliver, State);
         false -> ok
     end,
     rabbit_trace:tap_trace_out(Msg, TraceState),
@@ -1277,13 +1277,13 @@ collect_acks(ToAcc, PrefixAcc, Q, DeliveryTag, Multiple) ->
     end.
 
 ack(Acked, State) ->
-    QIncs = fold_per_queue(
-              fun (QPid, MsgIds, L) ->
-                      ok = rabbit_amqqueue:ack(QPid, MsgIds, self()),
-                      [{QPid, length(MsgIds)} | L]
-              end, [], Acked),
+    Incs = fold_per_queue(
+             fun (QPid, MsgIds, L) ->
+                     ok = rabbit_amqqueue:ack(QPid, MsgIds, self()),
+                     [{queue_stats, QPid, length(MsgIds)} | L]
+             end, [], Acked),
     ok = notify_limiter(State#ch.limiter, Acked),
-    maybe_incr_stats(QIncs, ack, State).
+    incr_stats(Incs, ack, State).
 
 new_tx(State) -> State#ch{uncommitted_message_q = queue:new(),
                           uncommitted_acks      = [],
@@ -1346,15 +1346,15 @@ deliver_to_queues({Delivery = #delivery{message    = Message = #basic_message{
                                            State#ch.queue_monitors)},
     State2 = process_routing_result(RoutingRes, DeliveredQPids,
                                     XName, MsgSeqNo, Message, State1),
-    maybe_incr_stats([{XName, 1} |
-                      [{{QPid, XName}, 1} ||
-                          QPid <- DeliveredQPids]], publish, State2),
+    incr_stats([{exchange_stats, XName, 1} |
+                [{queue_exchange_stats, {QPid, XName}, 1} ||
+                    QPid <- DeliveredQPids]], publish, State2),
     State2.
 
 process_routing_result(unroutable, _, XName,  MsgSeqNo, Msg, State) ->
     ok = basic_return(Msg, State, no_route),
-    maybe_incr_stats([{Msg#basic_message.exchange_name, 1}],
-                     return_unroutable, State),
+    incr_stats([{exchange_stats, Msg#basic_message.exchange_name, 1}],
+               return_unroutable, State),
     record_confirm(MsgSeqNo, XName, State);
 process_routing_result(routed,    [], XName,  MsgSeqNo,   _, State) ->
     record_confirm(MsgSeqNo, XName, State);
@@ -1379,10 +1379,11 @@ send_confirms(State = #ch{tx_status = none, confirmed = []}) ->
     State;
 send_confirms(State = #ch{tx_status = none, confirmed = C}) ->
     MsgSeqNos =
-        lists:foldl(fun ({MsgSeqNo, XName}, MSNs) ->
-                            maybe_incr_stats([{XName, 1}], confirm, State),
-                            [MsgSeqNo | MSNs]
-                    end, [], lists:append(C)),
+        lists:foldl(
+          fun ({MsgSeqNo, XName}, MSNs) ->
+                  incr_stats([{exchange_stats, XName, 1}], confirm, State),
+                  [MsgSeqNo | MSNs]
+          end, [], lists:append(C)),
     send_confirms(MsgSeqNos, State#ch{confirmed = []});
 send_confirms(State) ->
     maybe_complete_tx(State).
@@ -1465,21 +1466,15 @@ i(Item, _) ->
 name(#ch{conn_name = ConnName, channel = Channel}) ->
     list_to_binary(rabbit_misc:format("~s (~p)", [ConnName, Channel])).
 
-maybe_incr_stats(QXIncs, Measure, State) ->
+incr_stats(Incs, Measure, State) ->
     case rabbit_event:stats_level(State, #ch.stats_timer) of
-        fine -> [incr_stats(QX, Inc, Measure) || {QX, Inc} <- QXIncs];
+        fine -> [update_measures(Type, Key, Inc, Measure) ||
+                    {Type, Key, Inc} <- Incs];
         _    -> ok
     end.
 
-incr_stats({_, _} = QX, Inc, Measure) ->
-    update_measures(queue_exchange_stats, QX, Inc, Measure);
-incr_stats(QPid, Inc, Measure) when is_pid(QPid) ->
-    update_measures(queue_stats, QPid, Inc, Measure);
-incr_stats(X, Inc, Measure) ->
-    update_measures(exchange_stats, X, Inc, Measure).
-
-update_measures(Type, QX, Inc, Measure) ->
-    Measures = case get({Type, QX}) of
+update_measures(Type, Key, Inc, Measure) ->
+    Measures = case get({Type, Key}) of
                    undefined -> [];
                    D         -> D
                end,
@@ -1487,8 +1482,7 @@ update_measures(Type, QX, Inc, Measure) ->
               error   -> 0;
               {ok, C} -> C
           end,
-    put({Type, QX},
-        orddict:store(Measure, Cur + Inc, Measures)).
+    put({Type, Key}, orddict:store(Measure, Cur + Inc, Measures)).
 
 emit_stats(State) ->
     emit_stats(State, []).
-- 
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