Mercurial > MadButterfly

annotate pyink/data_monitor.py @ 1261:6177f5d0ef01

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Remove the layer when a layer group being removed.
author Thinker K.F. Li <thinker@codemud.net>
date Tue, 11 Jan 2011 17:59:17 +0800
parents 0cb5979549be
children ca301f6abef7
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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37 if not self._domview.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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46 self._domview.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 for attr_name in clazz_dict:
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52 if (not attr_name.startswith('do')) or \
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53 (not callable(clazz_dict[attr_name])):
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54 continue
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55 clazz_dict[attr_name] = \
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56 gen_sentinel(attr_name, clazz_dict[attr_name])
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57 pass
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58
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59 clazz = type.__new__(mclazz, name, bases, clazz_dict)
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60
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61 return clazz
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62 pass
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63