An application that can run on graphs and produce results. Analytical engine will build the app dynamic library when instantiate a app instance. And the dynamic library will be reused if subsequent app's signature matches one of previous ones.
| 428 | |
| 429 | |
| 430 | class App(object): |
| 431 | """An application that can run on graphs and produce results. |
| 432 | |
| 433 | Analytical engine will build the app dynamic library when instantiate a app instance. |
| 434 | And the dynamic library will be reused if subsequent app's signature matches one of |
| 435 | previous ones. |
| 436 | """ |
| 437 | |
| 438 | def __init__(self, app_node, key): |
| 439 | self._app_node = app_node |
| 440 | self._session = self._app_node.session |
| 441 | self._key = key |
| 442 | # copy and set op evaluated |
| 443 | self._app_node.op = deepcopy(self._app_node.op) |
| 444 | self._app_node.evaluated = True |
| 445 | self._app_node._unload_op = unload_app(self._app_node) |
| 446 | self._session.dag.add_op(self._app_node.op) |
| 447 | self._saved_signature = self.signature |
| 448 | |
| 449 | def __getattr__(self, name): |
| 450 | if hasattr(self._app_node, name): |
| 451 | return getattr(self._app_node, name) |
| 452 | raise AttributeError("{0} not found.".format(name)) |
| 453 | |
| 454 | @property |
| 455 | def key(self): |
| 456 | """A unique identifier of App.""" |
| 457 | return self._key |
| 458 | |
| 459 | @property |
| 460 | def signature(self): |
| 461 | """Signature is computed by all critical components of the App.""" |
| 462 | return hashlib.sha256( |
| 463 | "{}.{}".format(self._app_assets.signature, self._graph.template_str).encode( |
| 464 | "utf-8", errors="ignore" |
| 465 | ) |
| 466 | ).hexdigest() |
| 467 | |
| 468 | def _unload(self): |
| 469 | return self._session._wrapper(self._app_node._unload()) |
| 470 | |
| 471 | def __del__(self): |
| 472 | """Unload app. Both on engine side and python side. Set the key to None.""" |
| 473 | try: |
| 474 | self.session.run(self._unload()) |
| 475 | except Exception: # pylint: disable=broad-except |
| 476 | pass |
| 477 | |
| 478 | def __call__(self, *args, **kwargs): |
| 479 | return self._session._wrapper(self._app_node(*args, **kwargs)) |
| 480 | |
| 481 | |
| 482 | class UnloadedApp(DAGNode): |