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57 lines
1.1 KiB
Erlang
57 lines
1.1 KiB
Erlang
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-module(dummy_server).
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-behaviour(gen_server).
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-export([start_link/0, set_state/1, get_state/0]).
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-export([init/1,
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handle_call/3,
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handle_cast/2,
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handle_info/2,
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terminate/2,
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code_change/3]).
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%%
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start_link() ->
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gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
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set_state(What) ->
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gen_server:call(?MODULE, {set_state, What}).
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get_state() ->
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gen_server:call(?MODULE, get_state).
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%%
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init([]) ->
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say("init, setting state to 0", []),
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{ok, 0}.
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handle_call({set_state, NewState}, _From, _State) ->
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{reply, {ok, NewState}, NewState};
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handle_call(get_state, _From, State) ->
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{reply, State, State}.
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handle_cast('__not_implemented', State) ->
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{noreply, State}.
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handle_info(_Info, State) ->
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say("info ~p, ~p.", [_Info, State]),
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{noreply, State}.
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terminate(_Reason, _State) ->
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say("terminate ~p, ~p", [_Reason, _State]),
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ok.
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code_change(_OldVsn, State, _Extra) ->
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say("code_change ~p, ~p, ~p", [_OldVsn, State, _Extra]),
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{ok, State}.
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%% Internal
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say(Format, Data) ->
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io:format("~p:~p: ~s~n", [?MODULE, self(), io_lib:format(Format, Data)]).
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