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annotate pyink/data_monitor.py @ 1513:5d4c7ec05bcd

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author Thinker K.F. Li <thinker@codemud.net>
date Tue, 10 May 2011 23:43:12 +0800
parents cfbc0f3e54e3
children
rev   line source
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07e0cb1e051d Add class consistency_checker for domview_ui.
Thinker K.F. Li <thinker@codemud.net>
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1 import os
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2
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3 ## \brief Monitor accessing on the dta model.
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4 #
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5 # This class is a meta-class that monitor data accessing for its instance
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6 # classes.
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7 #
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8 # It is a monitor with a small modification. The calling would be
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9 # rejected when the domview_ui was locked. It will not waiting for a
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10 # lock.
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11 #
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12 # \see http://en.wikipedia.org/wiki/Monitor_%28synchronization%29
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13 #
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14 # All methods, of instance classes, who's name is prefixed with 'do' are
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15 # monitored. When a monitored method was called, monitor will try to lock
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16 # _domview of the object. The method is only called if successfully acquiring
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17 # the lock, or return immediately. The lock is released after the calling
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18 # returned.
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19 #
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20 class data_monitor(type):
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21 def __new__(mclazz, name, bases, clazz_dict):
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22 debug_level = 0
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23 if os.environ.has_key('DATA_MONITOR_DBG'):
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24 debug_level = int(os.environ['DATA_MONITOR_DBG'])
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25 pass
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26
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27 def gen_sentinel(func_name, func):
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28 def sentinel(self, *args, **kws):
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29 if debug_level >= 1:
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30 print 'calling %s.%s' % (name, func_name)
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31 pass
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32 if debug_level >= 2:
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33 print ' args: %s' % (repr(args))
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34 print ' kws: %s' % (repr(kws))
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35 pass
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36
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ca301f6abef7 Support undo for insert key frame/rm keyframe. We will refresh all layers and scenes since it is not feasible to collect these changes and update the layers and scenes. We may scan two level only in the future to improve the performance.
wycc
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37 if not self._locker.lock(): # can not lock
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38 if debug_level >= 1:
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39 print ' fault to lock'
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40 pass
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41 return
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42
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43 try:
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44 func(self, *args, **kws)
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45 finally:
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ca301f6abef7 Support undo for insert key frame/rm keyframe. We will refresh all layers and scenes since it is not feasible to collect these changes and update the layers and scenes. We may scan two level only in the future to improve the performance.
wycc
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46 self._locker.unlock()
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47 pass
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48 pass
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49 return sentinel
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50
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51 monitor_prefix = 'do'
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52 if clazz_dict.has_key('__data_monitor_prefix__'):
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53 monitor_prefix = clazz_dict['__data_monitor_prefix__']
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54 pass
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55
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56 for attr_name in clazz_dict:
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57 if (not attr_name.startswith(monitor_prefix)) or \
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58 (not callable(clazz_dict[attr_name])):
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59 continue
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60 clazz_dict[attr_name] = \
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61 gen_sentinel(attr_name, clazz_dict[attr_name])
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62 pass
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63
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64 clazz = type.__new__(mclazz, name, bases, clazz_dict)
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65
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66 return clazz
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67 pass
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68