pgj commented on code in PR #4812:
URL: https://github.com/apache/couchdb/pull/4812#discussion_r1413085196
##########
src/rexi/src/rexi.erl:
##########
@@ -328,3 +336,23 @@ drain_acks(Count) ->
after 0 ->
{ok, Count}
end.
+
+get_delta() ->
+ {delta, couch_stats_resource_tracker:make_delta()}.
+
+maybe_add_delta(T) ->
+ case couch_stats_resource_tracker:is_enabled() of
+ false ->
+ T;
+ true ->
+ add_delta(T, get_delta())
+ end.
+
+add_delta({A}, Delta) -> {A, Delta};
Review Comment:
The same could be expressed with the help of `erlang:insert_element/3` and
`erlang:size/1`:
```erlang
add_delta(T, Delta) -> erlang:insert_element(erlang:size(T) + 1, T, Delta).
```
If maximum tuple size matters (semantically equivalent):
```erlang
add_delta(T, Delta) when 0 < erlang:size(T), erlang:size(T) < 8 ->
erlang:insert_element(erlang:size(T) + 1, T, Delta);
add_delta(T, _Delta) -> T.
```
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