80 lines
3.4 KiB
Python
80 lines
3.4 KiB
Python
# eventpy library
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# Copyright (C) 2020 Wang Qi (wqking)
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# Github: https://github.com/wqking/eventpy
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import eventpy.policy
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import eventpy.callbacklist as callbacklist
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import eventpy.internal.lockguard as lockguard
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class EventDispatcher :
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def __init__(self, policy = eventpy.policy.defaultPolicy) :
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self._policy = policy.clone()
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self._eventCallbackListMapLock = self._policy.lockClass()
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self._eventCallbackListMap = {}
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if self._policy.argumentPassingMode == eventpy.policy.argumentPassingExcludeEvent :
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self.dispatch = self._dispatchExcludeEvent
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else :
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self.dispatch = self._dispatchIncludeEvent
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def appendListener(self, event, callback) :
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return self._getCallbackList(event).append(callback)
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def prependListener(self, event, callback) :
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return self._getCallbackList(event).prepend(callback)
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def insertListener(self, event, callback, beforeHandle) :
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return self._getCallbackList(event).insert(callback, beforeHandle)
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def removeListener(self, event, handle) :
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callableList = self._doFindCallableList(event)
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if callableList is not None :
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return callableList.remove(handle)
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return False
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def forEach(self, event, func) :
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callableList = self._doFindCallableList(event)
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if callableList is not None :
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return callableList.forEach(func)
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def forEachIf(self, event, func) :
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callableList = self._doFindCallableList(event)
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if callableList is not None :
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return callableList.forEachIf(func)
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return True
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# Bypass any getEvent policy. The first argument is the event type.
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# Most used for internal purpose.
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def directDispatch(self, event, *args, **kwargs) :
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callableList = self._doFindCallableList(event)
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if callableList is not None :
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callableList(*args, **kwargs)
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def _dispatchIncludeEvent(self, *args, **kwargs) :
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event = self._policy.getEvent(*args, **kwargs)
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self.directDispatch(event, *args, **kwargs)
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def _dispatchExcludeEvent(self, e, *args, **kwargs) :
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event = self._policy.getEvent(e, *args, **kwargs)
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self.directDispatch(event, *args, **kwargs)
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def _getCallbackList(self, event) :
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with lockguard.LockGuard(self._eventCallbackListMapLock) :
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if event not in self._eventCallbackListMap :
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self._eventCallbackListMap[event] = callbacklist.CallbackList(self._policy)
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return self._eventCallbackListMap[event]
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def _doFindCallableList(self, event) :
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with lockguard.LockGuard(self._eventCallbackListMapLock) :
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if event in self._eventCallbackListMap :
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return self._eventCallbackListMap[event]
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return None
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