Pyeventbus异步事件处理框架
Pyeventbus是个十分轻巧的异步事件处理框架。
特性：
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Pyeventbus 会检查你的事件消息类型和侦听器的类型的合法性，侦听器和消息需要被正确的创建
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允许一个事件消息有多个对应的处理方法，事件处理的时间复杂度是O(k)的，取决于你的侦听处理函数有多少个
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支持同步和异步事件处理，可自定义异步事件处理线程池大小
示例代码：
from eventbus.eventbus import EventBus
#now create a eventbus,the default pool size is 4 and isdaemon is true
eventbus=EventBus()
#add the listener to eventbus so it will use the right handler to process the event
eventbus.register(Listener())
#now the event message were sent,eventbus will process
#this is for the async post
eventbus.async_post(GreetEvent())
#this is for the sync post
eventbus.post(GreetEvent())
#remove the listener
eventbus.unregister(Listener())
#destroy the eventbus
eventbus.destroy()
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