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feat: add receive_events_non_blocking #65

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feat: add receive_events_non_blocking #65

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8 changes: 8 additions & 0 deletions src/snabbkaffe.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@
, subscribe/2
, subscribe/1
, receive_events/1
, receive_events_non_blocking/1
, wait_async_action/3
, push_stat/2
, push_stat/3
Expand Down Expand Up @@ -249,6 +250,13 @@ subscribe(Predicate, NEvents, Timeout, BackInTime) ->
receive_events(SubRef) ->
snabbkaffe_collector:receive_events(SubRef).

%% @doc Like `receive_events', but returns immediatelly with all collected events so far,
%% without blocking for more expected events.
-spec receive_events_non_blocking(snabbkaffe_collector:subscription()) ->
[snabbkaffe:event()].
receive_events_non_blocking(SubRef) ->
snabbkaffe_collector:receive_events_non_blocking(SubRef).

-spec start_trace() -> ok.
start_trace() ->
case snabbkaffe_sup:start_link() of
Expand Down
23 changes: 23 additions & 0 deletions src/snabbkaffe_collector.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,7 @@
, block_until/3
, subscribe/4
, receive_events/1
, receive_events_non_blocking/1
, tp/3
, push_stat/3
]).
Expand Down Expand Up @@ -159,6 +160,12 @@ receive_events(Sub = #subscription{ref = Ref, n = NEvents}) ->
unsubscribe(Sub),
Ret.

-spec receive_events_non_blocking(subscription()) -> [snabbkaffe:event()].
receive_events_non_blocking(Sub = #subscription{ref = Ref, n = NEvents}) ->
Ret = do_recv_events_non_blocking(Ref, NEvents, []),
unsubscribe(Sub),
Ret.

%% @doc NOTE: This function should be called from the same process
%% that subscribed to `SubRef'
-spec unsubscribe(subscription()) -> ok.
Expand Down Expand Up @@ -425,6 +432,22 @@ do_recv_events(Ref, N, Acc) ->
do_recv_events(Ref, N - 1, [Event|Acc])
end.

-spec do_recv_events_non_blocking(reference(),
non_neg_integer(),
[snabbkaffe:event()]
) -> [snabbkaffe:event()].
do_recv_events_non_blocking(_Ref, 0, Acc) ->
lists:reverse(Acc);
do_recv_events_non_blocking(Ref, N, Acc) ->
receive
{'DOWN', Ref, _, _, _} ->
exit(snabbkaffe_collector_died);
{Ref, Event} ->
do_recv_events_non_blocking(Ref, N - 1, [Event|Acc])
after
0 -> lists:reverse(Acc)
end.

-spec do_wait_for_silence(integer(), integer()) -> ok.
do_wait_for_silence(SilenceInterval, SleepTime) ->
timer:sleep(SleepTime),
Expand Down