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75 lines
2.3 KiB
Python
75 lines
2.3 KiB
Python
# Created By: Virgil Dupras
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# Created On: 2010-11-19
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# Copyright 2011 Hardcoded Software (http://www.hardcoded.net)
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#
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# This software is licensed under the "GPLv3" License as described in the "LICENSE" file,
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# which should be included with this package. The terms are also available at
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# http://www.gnu.org/licenses/gpl-3.0.html
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from threading import Thread
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import sys
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from typing import Callable, Tuple, Union
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from hscommon.jobprogress.job import Job, JobInProgressError, JobCancelled
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class ThreadedJobPerformer:
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"""Run threaded jobs and track progress.
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To run a threaded job, first create a job with _create_job(), then call _run_threaded(), with
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your work function as a parameter.
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Example:
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j = self._create_job()
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self._run_threaded(self.some_work_func, (arg1, arg2, j))
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"""
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_job_running = False
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last_error = None
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# --- Protected
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def create_job(self) -> Job:
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if self._job_running:
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raise JobInProgressError()
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self.last_progress: Union[int, None] = -1
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self.last_desc = ""
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self.job_cancelled = False
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return Job(1, self._update_progress)
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def _async_run(self, *args) -> None:
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target = args[0]
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args = tuple(args[1:])
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self._job_running = True
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self.last_error = None
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try:
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target(*args)
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except JobCancelled:
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pass
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except Exception as e:
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self.last_error = e
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self.last_traceback = sys.exc_info()[2]
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finally:
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self._job_running = False
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self.last_progress = None
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def reraise_if_error(self) -> None:
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"""Reraises the error that happened in the thread if any.
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Call this after the caller of run_threaded detected that self._job_running returned to False
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"""
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if self.last_error is not None:
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raise self.last_error.with_traceback(self.last_traceback)
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def _update_progress(self, newprogress: int, newdesc: str = "") -> bool:
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self.last_progress = newprogress
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if newdesc:
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self.last_desc = newdesc
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return not self.job_cancelled
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def run_threaded(self, target: Callable, args: Tuple = ()) -> None:
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if self._job_running:
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raise JobInProgressError()
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args = (target,) + args
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Thread(target=self._async_run, args=args).start()
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