erlang 自定义behaviour

erlang 自定义behaviour

参考文章：

关于Erlang中的behaviour

erlang 如何自定义 behaviour

behaviour 定义区别

例子中的behaviour区别

my_behaviour 自定义behaviour方式没有类型规范的约束，约束只有函数名和元数
test_behaviour 自定义behaviour方式简化了一些

源代码

-module(my_behaviour).
-export([behaviour_info/1]).
-export([start/1, stop/0]).behaviour_info(callbacks) ->[ {init, 1},{handle, 2}];
behaviour_info(_Other) ->undefined.start(Mod) ->State = Mod:init(0),{ok, State2} = Mod:handle(add, State),io:format("state : ~p~n", [State2]).stop() ->stop.

-module(test_behaviour).
-export([start/1, stop/0]).
-callback init( number() ) -> number().
-callback handle( Event :: atom(), ARG::number() ) -> number().
start(Mod) ->State = Mod:init(0),{ok, State2} = Mod:handle(add, State),io:format("state : ~p~n", [State2]).stop() ->stop.

-module(use_my_behaviour).
% -behaviour(my_behaviour).
-behaviour(test_behaviour).
-export([init/1, handle/2]).init(State) ->io:format("init ~p~n", [State]),State.handle(Request, State) ->io:format("handle request:~p state:~p~n", [Request, State]),State2 = State + 1,{ok, State2}.

结果

结果一:

c(my_behaviour).
{ok,my_behaviour}
5> c(use_my_behaviour).
{ok,use_my_behaviour}
6> my_behaviour:start(use_my_behaviour).
init 0
handle request:add state:0
state : 1
ok

c(test_behaviour).

{ok,test_behaviour}

16> c(use_my_behaviour).

{ok,use_my_behaviour}

17> test_behaviour:start(use_my_behaviour).

init 0

handle request:add state:0

state : 1

ok

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