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44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
5 years ago
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from __future__ import absolute_import
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from apscheduler.schedulers.base import BaseScheduler
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try:
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from PyQt5.QtCore import QObject, QTimer
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except (ImportError, RuntimeError): # pragma: nocover
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try:
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from PyQt4.QtCore import QObject, QTimer
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except ImportError:
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try:
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from PySide.QtCore import QObject, QTimer # noqa
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except ImportError:
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raise ImportError('QtScheduler requires either PyQt5, PyQt4 or PySide installed')
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class QtScheduler(BaseScheduler):
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"""A scheduler that runs in a Qt event loop."""
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_timer = None
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def shutdown(self, *args, **kwargs):
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super(QtScheduler, self).shutdown(*args, **kwargs)
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self._stop_timer()
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def _start_timer(self, wait_seconds):
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self._stop_timer()
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if wait_seconds is not None:
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wait_time = min(wait_seconds * 1000, 2147483647)
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self._timer = QTimer.singleShot(wait_time, self._process_jobs)
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def _stop_timer(self):
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if self._timer:
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if self._timer.isActive():
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self._timer.stop()
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del self._timer
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def wakeup(self):
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self._start_timer(0)
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def _process_jobs(self):
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wait_seconds = super(QtScheduler, self)._process_jobs()
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self._start_timer(wait_seconds)
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