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erlang学习：用OTP构建系统2，警报管理

news 2025/7/14 18:43:51

今日学习用OTP构建系统的警报管理，
首先进行配置错误记录器

[{sasl,[{sasl_error_logger, false},{error_logger_mf_dir, "/code/erlang/erlangstudy"},{error_logger_mf_maxbytes, 10485760},{error_logger_mf_maxfiles, 10}]}
].

警报处理器gen_event的回调代码请添加图片描述

-module(my_alarm_handler).
-behaviour(gen_event).-export([init/1, code_change/3, handle_event/2, handle_call/2, handle_info/2, terminate/2]).init(Args) ->io:format("*** my_alarm_handler init:~p~n", [Args]),{ok, 0}.handle_event({set_alarm, tooHot}, N) ->error_logger:error_msg("*** Tell the Engineer to turn on the fan~n"),{ok, N + 1};
handle_event({clear_alarm, tooHot}, N) ->error_logger:error_msg("*** Danger over. Turn off the fan~n"),{ok, N};
handle_event(Event, N) ->io:format("*** unmatched event:~p~n", [Event]),{ok, N}.handle_call(_Request, N) ->Reply = N, {ok, Reply, N}.
handle_info(_Info, N) ->{ok, N}.terminate(_Reason, _N) ->ok.
code_change(_OldVsn, State, _Extra) ->{ok, State}.