_Delegate(func, args, kwargs) -> _Delegate instance
| 47 | ################################################################################ |
| 48 | |
| 49 | class _Delegate: |
| 50 | |
| 51 | "_Delegate(func, args, kwargs) -> _Delegate instance" |
| 52 | |
| 53 | slots('func, args, kwargs, mutex, value, error') |
| 54 | |
| 55 | def __init__(self, func, args, kwargs): |
| 56 | "Initializes instance from arguments and prepares to run." |
| 57 | self.__func = func |
| 58 | self.__args = args |
| 59 | self.__kwargs = kwargs |
| 60 | self.__mutex = _thread.allocate_lock() |
| 61 | self.__mutex.acquire() |
| 62 | |
| 63 | def __call__(self): |
| 64 | "Executes code with arguments and allows value retrieval." |
| 65 | try: |
| 66 | self.__value = self.__func(*self.__args, **self.__kwargs) |
| 67 | self.__error = False |
| 68 | except: |
| 69 | self.__value = sys.exc_info()[1] |
| 70 | self.__error = True |
| 71 | self.__mutex.release() |
| 72 | |
| 73 | @property |
| 74 | def value(self): |
| 75 | "Waits for value availability and raises or returns data." |
| 76 | self.__mutex.acquire() |
| 77 | if self.__error: |
| 78 | raise self.__value |
| 79 | return self.__value |