136 lines
4.1 KiB
Python
Executable File
136 lines
4.1 KiB
Python
Executable File
import HydrusConstants as HC
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import Queue
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import threading
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import traceback
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import weakref
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import wx
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import wx.lib.newevent
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( PubSubEvent, EVT_PUBSUB ) = wx.lib.newevent.NewEvent()
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class HydrusPubSub( object ):
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def __init__( self ):
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self._pubsubs = []
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self._callables = []
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self._lock = threading.Lock()
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self._topics_to_objects = {}
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self._topics_to_method_names = {}
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def _GetCallables( self, topic ):
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callables = []
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if topic in self._topics_to_objects:
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try:
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objects = self._topics_to_objects[ topic ]
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for object in objects:
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method_names = self._topics_to_method_names[ topic ]
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for method_name in method_names:
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if hasattr( object, method_name ):
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try:
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callable = getattr( object, method_name )
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callables.append( callable )
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except wx.PyDeadObjectError: pass
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except TypeError as e:
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if '_wxPyDeadObject' not in str( e ): raise
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except: pass
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return callables
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def NoJobsQueued( self ):
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with self._lock:
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return len( self._pubsubs ) == 0
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def WXProcessQueueItem( self ):
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# we don't want to map a topic to its callables until the previous topic's callables have been fully executed
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# e.g. when we start a message with a pubsub, it'll take a while (in independant thread-time) for wx to create
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# the dialog and hence map the new callable to the topic. this was leading to messages not being updated
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# because the (short) processing thread finished and entirely pubsubbed before wx had a chance to boot the
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# message.
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do_callable = False
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with self._lock:
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if len( self._callables ) > 0:
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( callable, args, kwargs ) = self._callables.pop( 0 )
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do_callable = True
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else:
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( topic, args, kwargs ) = self._pubsubs.pop( 0 )
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callables = self._GetCallables( topic )
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self._callables = [ ( callable, args, kwargs ) for callable in callables ]
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for i in range( len( self._callables ) ): wx.PostEvent( HC.app, PubSubEvent() )
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# do this _outside_ the lock, lol
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if do_callable: callable( *args, **kwargs )
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def pub( self, topic, *args, **kwargs ):
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with self._lock:
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self._pubsubs.append( ( topic, args, kwargs ) )
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wx.PostEvent( HC.app, PubSubEvent() )
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def sub( self, object, method_name, topic ):
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with self._lock:
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if topic not in self._topics_to_objects: self._topics_to_objects[ topic ] = weakref.WeakSet()
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if topic not in self._topics_to_method_names: self._topics_to_method_names[ topic ] = set()
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self._topics_to_objects[ topic ].add( object )
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self._topics_to_method_names[ topic ].add( method_name )
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def WXpubimmediate( self, topic, *args, **kwargs ):
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with self._lock:
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callables = self._GetCallables( topic )
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for callable in callables: callable( *args, **kwargs )
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