Re: Error "signal only works in main thread"

Hi,

that works! Thanks a lot!



Am Samstag, 12. März 2016 03:47:41 UTC+1 schrieb Joel Rivera:
>
> Hello Max, 
>
> > thanks for your answer! I implemented a plugin for the optimization 
> > routines, but it still results in the same error. :/ Are you sure 
> > plugins run on the main thread? 
> > 
> > Please take a look at the code - did I do anything wrong? 
> > https://gist.github.com/anonymous/d955db89c8381d052653 
>
>
> I was wrong about the assumption of the plugins and the main thread. 
> You implemented correctly what I suggested. 
>
> But don't despair! I just hacked away a nifty class that can help you. 
>
> The full example is in this gist: 
>
> https://gist.github.com/cyraxjoe/93bedb7d942e75ac44f7 
>
> But I'll copy/paste the relevant class and decorator: 
>
>
> class MainExecutor: 
>     """Wrap a callable to ensure that the execution takes place on the 
>     MainThread based on the cherrypy.engine and the 'main' channel. 
>
>     For example: 
>
>     >>> def sample(arg): return "foo {}".format(arg) 
>     ... 
>     >>> mexec = MainExecutor(sample) 
>     >>> mexec("bar") 
>     'foo bar' 
>     >>> mexec("test") 
>     'foo test' 
>     """ 
>
>     def __init__(self, func, bus=cp.engine): 
>         self.func = func 
>         self.bus = bus 
>
>     def __call__(self, *args, **kwargs): 
>         results = [] 
>         done_event = threading.Event() 
>         executable = functools.partial( 
>             self._execute, results, done_event, *args, **kwargs) 
>         self.bus.subscribe('main', executable) 
>         done_event.wait() 
>         self.bus.unsubscribe('main', executable) 
>         success, rsp = results 
>         if success: 
>             return rsp 
>         else: 
>             raise rsp 
>
>     def _execute(self, response, done_event, *args, **kwargs): 
>         try: 
>             result = self.func(*args, **kwargs) 
>         except Exception as e: 
>             response.append(False) 
>             response.append(e) 
>         else: 
>             response.append(True) 
>             response.append(result) 
>         finally: 
>             done_event.set() 
>
>
> def in_main_thread(func): 
>     """Pretty interface to use the MainExecutor class 
>     as a decorator and not have the CamelCase on a decorator. 
>     """ 
>     return MainExecutor(func) 
>
>
> Cheers, 
> -- 
> Rivera² 
>

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