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Apache Kafka Erlang client library
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src/brod_topic_subscriber_cb_fun.erl
%%%
%%% Copyright (c) 2020 Klarna Bank AB (publ)
%%%
%%% Licensed under the Apache License, Version 2.0 (the "License");
%%% you may not use this file except in compliance with the License.
%%% You may obtain a copy of the License at
%%%
%%% http://www.apache.org/licenses/LICENSE-2.0
%%%
%%% Unless required by applicable law or agreed to in writing, software
%%% distributed under the License is distributed on an "AS IS" BASIS,
%%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%%% See the License for the specific language governing permissions and
%%% limitations under the License.
%%%
%%%=============================================================================
%%% @private
%%% A wrapper module that enables backward compatible use of
%%% `brod_topic_subscriber' with a fun instead of a callback module.
%%% @end
%%%=============================================================================
-module(brod_topic_subscriber_cb_fun).
-behavior(brod_topic_subscriber).
-export([init/2, handle_message/3]).
-include("brod_int.hrl").
%% @private This is needed to implement backward-consistent `cb_fun'
%% interface.
init(_Topic, #cbm_init_data{ committed_offsets = CommittedOffsets
, cb_fun = CbFun
, cb_data = CbState
}) ->
{ok, CommittedOffsets, {CbFun, CbState}}.
handle_message(Partition, Msg, {CbFun, CbState0}) ->
case CbFun(Partition, Msg, CbState0) of
{ok, ack, CbState} ->
{ok, ack, {CbFun, CbState}};
{ok, CbState} ->
{ok, {CbFun, CbState}};
Err ->
Err
end.