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# coding=UTF-8
# ex:ts=4:sw=4:et=on
# Author: Mathijs Dumon
# Based on code from Rick Spencer
# Copyright (c) 2013, Mathijs Dumon, Rick Spencer
# All rights reserved.
# Complete license can be found in the LICENSE file.
import logging
logger = logging.getLogger(__name__)
from threading import Thread, Event
class CancellableThread(Thread):
"""
Class for use by ThreadedTaskBox.
"""
def __init__(self, run_function, on_complete):
Thread.__init__(self)
self.setDaemon(True)
self.run_function = run_function
self.on_complete = on_complete
# Internal flag, for checking wether the user stopped.
self.__stop = Event()
# Internal flag, for checking wether the user cancelled.
self.__cancel = Event()
def run(self):
try:
# Tell the function to run
data = self.run_function(stop=self.__stop)
# Return function results, if not cancelled
if not self.__cancel.is_set():
self.on_complete(data)
except KeyboardInterrupt:
self.cancel()
except:
logger.exception("Unhandled exception in CancellableThread run()")
def stop(self):
"""
Stops the thread, and calls the on_complete callback
"""
self.__stop.set()
def cancel(self):
"""
Stops the thread, and does not call the on_complete callback.
"""
self.__cancel.set()
self.__stop.set()
pass #end of class
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