意义
加入gen_tcp之后，可以跨机器、网络去操作job_center
过程中遇到的问题：
clien收到rpc来的消息后，向tcp服务端发送消息，然后在接收到tcp服务端的消息之前老是先接收到进程rpc来的消息｛From,Bin｝，也就是在第二个receive的时候收到了非服务端来的消息，导致没有匹配成功4
loopRecv(Socket)->
receive
{tcp,Socket,Bin}->
Term=binary_to_term(Bin),
io:format("Recv From Job_center:~p~n",[Term]);
{tcp_closed,Socket}->
io:format("Drop Connect with Job_center~n");
{From,Bin}->
gen_tcp:send(Socket,term_to_binary(Bin)),
receive
{tcp,Socket,Bin}->
From ! binary_to_term(Bin);
{tcp_closed,Socket}->
From ! {tcp_closed,Socket}
after 0->
do_nothings
end;
_->
unknown
end,
io:format("finish a recv!~n"),
loopRecv(Socket).
后来加入after优先处理之后就好了，因为after在第二个receive中没有匹配到的时候，直接到after去，但是我after那里do_nothings，也就是不做事，然后就回到第一个receive去匹配了，但我还是没想明白为啥会收到一条来自进程的消息。
job_center.app
{application,job_center_app,
[{description,"A Job Deliver Center 1.0"},
{vsn,"1.0"},
{modules,[job_center_app,job_center_server,job_center,job_center_supervisor,job_center_alarm]},
{registered,[job_center]},
{applications,[kernel,stdlib]},
{mod,{job_center_app,[]}},
{start_phases,[]}
]}.
job_center.erl （job_center核心功能）
-module(job_center).
-behaviour(gen_server).
-export([loopAccept/1,loopRecv/1,code_change/3,terminate/2,test/0,start_link/0,job_getStatistic/1,stop/0,init/1,add_job/1,work_wanted/0,job_done/2,handle_call/3,handle_cast/2,handle_info/2,job_statistic/0]).
-import(gen_server,[start_link/4,call/2]).
-spec add_job(fun())->integer().
-define(debug_flag,true).
-ifdef(debug_flag).
-define(DEBUG(X),io:format("DEBUG ~p:~p ~p~n",[?MODULE,?LINE,X])).
-else.
-define(DEBUG(X),void).
-endif.
test()->
start_link(),
job_center:add_job(fun()->good_job end).
start_link()->
io:format("start_link_now!~n"),
start_link({local,?MODULE},?MODULE,[],[]).
stop()->
call(?MODULE,stop).
init([])->
io:format("job_center Start!~n"),
%process_flag(trap_exit,true),
{ok,Listen}=gen_tcp:listen(6612,[binary,{packet,4}]),
io:format("Listen:~p~n",[Listen]),
spawn(fun()->loopAccept(Listen) end),
State=ets:new(?MODULE,[]),
ets:insert(State,{job_index,0}),
{ok,State}.
% gen_tcp function
loopAccept(Listen)->
{ok,Socket}=gen_tcp:accept(Listen),
spawn(fun()->loopAccept(Listen) end),
io:format("new Client In!~n"),
loopRecv(Socket).
loopRecv(Socket)->
receive
{tcp,Socket,Binary} when is_binary(Binary)->
Packet=binary_to_term(Binary),
io:format("Recv a message:~p~n",[Packet]),
Ret=case Packet of
{add_job,Fun}->
add_job(Fun);
{work_wanted}->
work_wanted();
{job_done,JobNumber,Status}->
job_done(JobNumber,Status);
{job_statistic}->
job_statistic();
{job_getStatistic,JobNumber}->
job_getStatistic(JobNumber);
_->
command_not_found
end,
gen_tcp:send(Socket,term_to_binary(Ret)),
loopRecv(Socket);
{tcp_closed,Socket}->
io:format("Client Disconnent~n");
UnKnown->
gen_tcp:send(Socket,term_to_binary({command_not_found,UnKnown})),
loopRecv(Socket)
end,
io:format("finish recv a msg!~n").
% user api
add_job(Fun)->
call(?MODULE,{add_job,Fun}).
work_wanted()->
call(?MODULE,{work_wanted}).
job_done(JobNumber,Status)->
io:format("Request change Job:~p Status:~p~n",[JobNumber,Status]),
call(?MODULE,{job_done,JobNumber,Status}).
job_statistic()->
call(?MODULE,{job_statistic}).
job_getStatistic(Index)->
call(?MODULE,{job_getStatistic,Index}).
% callback Function
handle_call({job_getStatistic,Index},_From,State)->
io:format("someone want to get statistic~n"),
case ets:member(State,Index) of
true->
io:format("getStatistic:~p~n",[Index]),
{reply,ets:lookup_element(State,Index,3),State};
false->
{reply,job_not_found,State}
end;
handle_call({job_statistic},_From,State)->
%未完成的任务数
Match_not_done=ets:match(State,{'$1','$2',not_done}),
io:format("未完成的数量:~p~n",[length(Match_not_done)]),
Match_doing=ets:match(State,{'$1','$2',doing}),
io:format("正在进行的数量:~p~n",[length(Match_doing)]),
Match_done=ets:match(State,{'$1','$2',done}),
io:format("已完成的数量:~p~n",[length(Match_done)]),
{reply,show_all_finish,State};
handle_call({add_job,Fun},_From,State)->
[{job_index,Index}]=ets:lookup(State,job_index),
ets:insert(State,[{job_index,Index+1},{Index,Fun,not_done}]),
Reply=ok,
{reply,Reply,State};
handle_call({work_wanted},{Pid,_Ref},State)->
Match_Ret=ets:match(State,{'$1','$2',not_done},1),
case Match_Ret of
'$end_of_table'->%没job了
Fun=void,
Index=-1,
{reply,{no_job_now,Index,Fun},State};
{[[Index,Fun]],_}->%判断表中还有未完成的job
ets:update_element(State,Index,{3,doing}),%更新状态为doing正在进行
%-------------------检测崩溃
spawn_link(fun()->
Ref=monitor(process,Pid),
receive
{'DOWN',Ref,process,Pid,Why}->
io:format("worker:~p leave for ~p ~n",[Pid,Why]),
Bool=Why=:=normal,
if
Bool=:=false->
job_center:job_done(Index,not_done);
Bool=:=true->
void
end
end
end),%监控是否崩溃防止崩溃时数据停留
%-------------------检测超时
spawn(fun()->
timer:sleep(4000),
case ets:lookup_element(State,Index,3) of
doing->Pid ! {hurry_up};
_->ok
end,
timer:sleep(2000),
exit(Pid,you_are_fired)
end),%检测超时，超过6秒就炒鱿鱼
{reply,{get_job_succ,Index,Fun,5000},State}
end;
handle_call({job_done,JobNumber,Status},_From,State)->
case ets:member(State,JobNumber) of%首先判断这个键值是否存在，存在才可以去lookup否则报错
true->
Status_change_before=ets:lookup_element(State,JobNumber,3),
%io:format("Match:~p~n",[Status_change_before]),
case Status_change_before of
done->
Reply=aleady_done;
doing->
Reply=good_job,
io:format("comfirm to change the status:~p of Index~p~n",[Status,JobNumber]),
ets:update_element(State,JobNumber,{3,Status});
not_done->
Reply=did_not_been_got
end,
{reply,Reply,State};
false->
{reply,job_not_found,State}
end;
handle_call(stop,_From,State)->
io:format("good bye!~n"),
{stop,normal,stopped,State}.
handle_cast(_Msg,State)->
{noreply,State}.
handle_info(_Info,State)->
{noreply,State}.
terminate(_Reason,_State)->ok.
code_change(_OldVsn,State,_Extra)->{ok,State}.
job_center_alarm.erl （警报处理器）
-module(job_center_alarm).
-export([init/1,handle_event/2,handle_call/2,handle_info/2,code_change/3,terminate/2]).
-behaviour(gen_event).
init(Args)->{ok,0}.
handle_event({set_alarm,What},State)->
io:format("Alarm comming:~p!~n",[What]),
{ok,State};
handle_event({clear_alarm,What},State)->
io:format("Alarm_clean:~p!~n",[What]),
{ok,State}.
handle_call(_Req,State)->
{ok,ignore,State}.
handle_info(_Info,State)->
{ok,State}.
code_change(_OldVsn,State,_Extra)->{ok,State}.
terminate(_Reason,_State)->ok.
job_center_app.erl （application打包管理）
-module(job_center_app).
-behaviour(application).
-export([start/2,stop/1]).
start(_Type,StartArgs)->
job_center_supervisor:start_link(StartArgs).
stop(_State)->
ok.
job_center_client.erl （Tcp客户端）
-module(job_center_client).
-export([start_client/0,loopRecv/1,rpc/1,job_done/2,job_statistic/0,job_getStatistic/1,work_wanted/0,add_job/1]).
start_client()->
case gen_tcp:connect("localhost",6612,[binary,{packet,4}]) of
{ok,Socket}->
register(job_center_client,spawn(fun()->loopRecv(Socket) end));
{error,Desc}->
io:format("connect error!~p~n",[Desc])
end.
loopRecv(Socket)->
receive
{tcp,Socket,Bin}->
Term=binary_to_term(Bin),
io:format("Recv From Job_center:~p~n",[Term]);
{tcp_closed,Socket}->
io:format("Drop Connect with Job_center~n");
{process,From,Bin}->
gen_tcp:send(Socket,term_to_binary(Bin)),
receive
{tcp,Socket,Bin}->
From ! binary_to_term(Bin);
{tcp_closed,Socket}->
From ! {tcp_closed,Socket}
after 0->
%gen_tcp:send(Socket,term_to_binary({err}))
do_nothing
end;
_->
unknown
end,
io:format("finish a recv!~n"),
loopRecv(Socket).
job_done(Index,State)->
rpc({job_done,Index,State}).
job_statistic()->
rpc({job_statistic}).
job_getStatistic(Index)->
rpc({job_getStatistic,Index}).
add_job(Fun)->
rpc({add_job,Fun}).
work_wanted()->
rpc({work_wanted}).
rpc(Req)->
io:format("start to send~n"),
job_center_client ! {process,self(),Req},
io:format("send finish!~n"),
receive
{tcp_closed,_Socket}->
io:format("Drop Connect with Job_center~n");
{tcp,_Socket,Bin}->
io:format("Ret:~p~n",[binary_to_term(Bin)]);
Any->
io:format("unknow:~p~n",[Any])
end,
io:format("receive finish").
job_center_server.erl（job_center服务端）
-module(job_center_server).
-export([start_server/0,loopAccept/1,loopRecv/1]).
start_server()->
{ok,Listen}=gen_tcp:listen(6612,[binary,{packet,4},{reuseaddr,true},{active,true}]),
spawn(fun()-> loopAccept(Listen) end).
loopAccept(Listen)->
{ok,Socket}=gen_tcp:accept(Listen),
spawn(fun()->loopAccept(Listen) end),
loopRecv(Socket).
loopRecv(Socket)->
receive
{tcp,Socket,Binary}->
Packet=binary_to_term(Binary),
Ret=rpc:call(job_center,Packet),
gen_tcp:send(Socket,term_to_binary(Ret)),
loopRecv(Socket);
{tcp_close,Socket}->
io:format("Server socket closed!~n",[])
end.
job_center_supervisor.erl （job_center监控树）
-module(job_center_supervisor).
-export([start/0,test/0,init/1,start_link/1]).
-behaviour(supervisor).
-define(MAXRESTARTS,3).
-define(TIME,10).
start()->
spawn(fun()-> supervisor:start_link({local,?MODULE},?MODULE,[]) end).
start_link(Args)->
supervisor:start_link({local,?MODULE},?MODULE,Args).
test()->
{ok,Pid}=supervisor:start_link({local,?MODULE},?MODULE,[]),
unlink(Pid).
init([])->
gen_event:swap_handler(alarm_handler,{alarm_handler,swap},{job_center_alarm,[]}),
{ok,{{one_for_one,?MAXRESTARTS,?TIME},
[{job_center,
{job_center,start_link,[]},
permanent,
10000,
worker,
[job_center]
}
]}}.
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