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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(List) -> [H|_] = List, H.

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

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

                              true -> Stage;

                              _ -> find_flow(List) end.



targets(Curr,Proc) ->

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

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



next_task(Curr, Proc) ->

    Targets = targets(Curr, Proc),

    find_flow(Targets).





denied_flow(Curr,Proc) ->

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



already_finished(Proc) ->

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



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

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

         {run,State}                  -> bpe_proc:run('Final',State);

         {until,Task,State}           -> bpe_proc:run(Task,State);

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

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

         {{reply,Message},Task,State} -> {reply,{{complete,Message},Task},State}; % TODO: REFACTOR

         {reply,Task,State}           -> {reply,{complete,Task},State} end.



handle_task(#beginEvent{},_CurrentTask,Target,Proc) ->

    {reply,{complete,Target},Proc};



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

    task_action(Module,CurrentTask,Target,Proc);



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

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



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

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





handle_starting_task(Curr, Proc) ->

    

    Task = bpe:step(Curr, Proc),

    Module = element(3, Task),

    case is_atom(Module) of

    true -> % io:format("handle_starting_task in a module ~p for a task ~p and a proc_id = ~p~n", [Module, Curr, Proc#process.id]),

                Module:action({starting, Curr}, Proc);

       false -> % io:format("Didn't find a module ~p for a task ~p and a proc_id = ~p~n", [Module, Curr, Proc#process.id]),

                {reply, {started, Curr}, Proc}

    end

.