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bpe src bpe_task.erl
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src/bpe_task.erl 

-module(bpe_task).

-author('Maxim Sokhatsky').

-compile(export_all).

-include("bpe.hrl").



find_flow(noflow) -> [];

find_flow([H|_]=List) when is_list(H) -> H;

find_flow([H|_]=List) when is_integer(H) -> List.

find_flow([],List) -> find_flow(List);

find_flow(Stage,List) -> case lists:member(Stage,List) of

                              true -> Stage;

                              _ -> find_flow(List) end.



targets(Name,Proc) ->

    lists:flatten([ Target || #sequenceFlow{source=Source,target=Target}

                           <- Proc#process.flows,  Source==Name]).



denied_flow(Curr,Proc) ->

    {reply,{denied_flow,Curr},Proc}.



already_finished(Proc) ->

    {stop,{normal,[]},Proc}.



task_action(Module,Source,Target,Proc) ->

    case Module:action({request,Source,Target},Proc) of

         {{reply,Message},Task,State} -> {reply,{{complete,Message},Task},State};

         {reply,Task,State}           -> {reply,{complete,Task},State};

         {reply,State}                -> {reply,{complete,Target},State};

         {error,Message,Task,State}   -> {reply,{error,Message,Task},State};

         {stop,Proc}                  -> {stop,{normal,Target},Proc}

    end.



handle_task(#beginEvent{module=Module},CurrentTask,Target,Proc) ->

    task_action(Module,CurrentTask,Target,Proc);



handle_task(#userTask{module=Module},CurrentTask,Target,Proc) ->

    task_action(Module,CurrentTask,Target,Proc);



handle_task(#receiveTask{module=Module,reader=_Reader},CurrentTask,Target,Proc) ->

    task_action(Module,CurrentTask,Target,Proc);



handle_task(#sendTask{module=Module,writer=_Writer},CurrentTask,Target,Proc) ->

    task_action(Module,CurrentTask,Target,Proc);



handle_task(#serviceTask{module=Module},CurrentTask,Target,Proc) ->

    task_action(Module,CurrentTask,Target,Proc);



handle_task(#gateway{type=parallel,module=Module},Src,Dst,Proc) ->

    task_action(Module,Src,Dst,Proc);



handle_task(#endEvent{module=Module},CurrentTask,Target,Proc) ->

    task_action(Module,CurrentTask,Target,Proc),

    {stop,{normal,Target},Proc};



handle_task(_,_,Target,Proc) ->

    {reply,{unknown_task,Target},Proc}.