index_cache_thread.py
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00001 # Software License Agreement (BSD License)
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00003 # Copyright (c) 2012, Willow Garage, Inc.
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00010 #  * Redistributions of source code must retain the above copyright
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00014 #    disclaimer in the documentation and/or other materials provided
00015 #    with the distribution.
00016 #  * Neither the name of Willow Garage, Inc. nor the names of its
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00032 
00033 import threading
00034 import time
00035 
00036 
00037 class IndexCacheThread(threading.Thread):
00038     """
00039     Updates invalid caches.
00040     One thread per timeline.
00041     """
00042     def __init__(self, timeline):
00043         threading.Thread.__init__(self)
00044         self.timeline = timeline
00045         self._stop_flag = False
00046         self.setDaemon(True)
00047         self.start()
00048 
00049     def run(self):
00050         while not self._stop_flag:
00051             with self.timeline.index_cache_cv:
00052                 # Wait until the cache is dirty
00053                 while len(self.timeline.invalidated_caches) == 0:
00054                     self.timeline.index_cache_cv.wait()
00055                     if self._stop_flag:
00056                         return
00057                 # Update the index for one topic
00058                 total_topics = len(self.timeline.topics)
00059                 update_step = max(1, total_topics / 100)
00060                 topic_num = 1
00061                 progress = 0
00062                 updated = False
00063                 for topic in self.timeline.topics:
00064                     if topic in self.timeline.invalidated_caches:
00065                         updated = (self.timeline._update_index_cache(topic) > 0)
00066                     if topic_num % update_step == 0 or topic_num == total_topics:
00067                         new_progress = int(100.0 * (float(topic_num) / total_topics))
00068                         if new_progress != progress:
00069                             progress = new_progress
00070                             if not self._stop_flag:
00071                                 self.timeline.scene().background_progress = progress
00072                                 self.timeline.scene().status_bar_changed_signal.emit()
00073                     topic_num += 1
00074 
00075             if updated:
00076                 self.timeline.scene().background_progress = 0
00077                 self.timeline.scene().status_bar_changed_signal.emit()
00078                 self.timeline.scene().update()
00079                 # Give the GUI some time to update
00080                 time.sleep(1.0)
00081 
00082     def stop(self):
00083         self._stop_flag = True
00084         cv = self.timeline.index_cache_cv
00085         with cv:
00086             cv.notify()


rqt_bag
Author(s): Aaron Blasdel, Tim Field
autogenerated on Mon Oct 6 2014 07:15:30