59 lines
1.4 KiB
Python
59 lines
1.4 KiB
Python
from PyQt4 import QtCore
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class Worker(QtCore.QObject):
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"""
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Implements a queue of tasks to be carried out in order
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in a single independent thread.
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"""
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# avoid multiple tests for debug availability
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pydevd_failed = False
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def __init__(self, app, name=None):
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super(Worker, self).__init__()
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self.app = app
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self.name = name
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def allow_debug(self):
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"""
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allow debuging/breakpoints in this threads
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should work from PyCharm and PyDev
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:return:
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"""
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if not self.pydevd_failed:
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try:
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import pydevd
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pydevd.settrace(suspend=False, trace_only_current_thread=True)
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except ImportError:
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self.pydevd_failed=True
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def run(self):
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self.app.log.debug("Worker Started!")
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self.allow_debug()
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# Tasks are queued in the event listener.
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self.app.worker_task.connect(self.do_worker_task)
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def do_worker_task(self, task):
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self.app.log.debug("Running task: %s" % str(task))
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self.allow_debug()
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if ('worker_name' in task and task['worker_name'] == self.name) or \
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('worker_name' not in task and self.name is None):
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try:
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task['fcn'](*task['params'])
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except Exception as e:
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self.app.thread_exception.emit(e)
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raise e
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return
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self.app.log.debug("Task ignored.")
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