erlang客户端程序学习（三）

erlang gen_fsm模式模板：

%%File Name:pro_ureq.erl
%%Using:This module is used for processing user's request which is "MASTER_VM_START".
%%The command is used for select a NC.
-module(pro_ureq).
-behaviour(gen_fsm).
-export([start/1]).
-export([message/1]).
-export([init/1, nc_unvailable/2, nc_available/2, code_change/4, handle_info/3]).
-export([handle_event/3, terminate/3, handle_sync_event/4]).
start(AllResource) ->
   
    gen_fsm:start_link({local, pro_ureq}, pro_ureq, AllResource, []).
message(Msg) ->
    gen_fsm:send_event(pro_ureq, {button, Msg}).

%%%Callback function
nc_unvailable({button, Msg}, {_SoFar, AllResource}) ->
    io:format("~p   ~p~n",[AllResource, Msg]),
    {next_state, nc_available, {[], AllResource}}.
nc_available(A, State) ->
    io:format("ssssssssssssssss~p~n", [A]),
    {next_state, nc_unvailable, State}.
init(AllResource) ->
    {ok, nc_unvailable, {[], AllResource}}.
code_change(_OldVsn, StateName, StateData, _Extra) ->
    {ok, StateName, StateData}.
handle_info(Info, StateName, StateData) ->
%%%%return Result
    {Info, StateName, StateData}.
handle_event(Event, StateName, StateData) ->
%%%%return Result
    {Event, StateName, StateData}.
terminate(_Reason, _StateName, _StateData) ->
    ok.
handle_sync_event(Event, From, StateName, StateData) ->
%%%%return Result
    {Event, From, StateName, StateData}.