[GitHub] [couchdb] nickva commented on a change in pull request #3164: Feature ebtree views

[GitBox <gi...@apache.org>]

nickva commented on a change in pull request #3164:
URL: https://github.com/apache/couchdb/pull/3164#discussion_r491780343



##########
File path: src/couch_views/src/couch_views_indexer.erl
##########
@@ -589,6 +613,51 @@ fail_job(Job, Data, Error, Reason) ->
     exit(normal).
 
 
+time_span(Id, Fun) ->
+    Start = erlang:system_time(microsecond),
+    try
+        Fun()
+    after
+        Diff = erlang:system_time(microsecond) - Start,
+        stat_store(Id, Diff / 1000000)
+    end.
+
+
+stat_incr(Id, Count) ->
+    case get('$view_stats') of
+        #{Id := OldCount} ->
+            stat_store(Id, OldCount + Count);
+        _ ->
+            stat_store(Id, Count)
+    end.
+
+
+stat_store(Id, Value) ->
+    NewStats = case get('$view_stats') of
+        #{} = Stats ->
+            maps:put(Id, Value, Stats);
+        undefined ->
+            #{Id => Value}
+    end,
+    put('$view_stats', NewStats).
+
+
+stat_dump() ->
+    case get('$view_stats') of
+        #{} = Stats ->
+            KVs = lists:sort(maps:to_list(Stats)),
+            Strs = lists:foldl(fun({Id, Value}, Acc) ->
+                Str = io_lib:format("~s:~w", [Id, Value]),
+                [Str | Acc]
+            end, [], KVs),
+            Msg = "XKCD VIEW STATS: " ++ string:join(lists:reverse(Strs),  " "),

Review comment:
       Debug log




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