A simple implementation of Observer pattern via Signals
Project description
- Green Rocket is a simple implementation of Observer (or Publish/Subscribe)
design pattern using Signals.
Create specific signal from base class:
>>> from greenrocket import Signal >>> class MySignal(Signal): ... pass ...
Subscribe handler:
>>> @MySignal.subscribe ... def handler(signal): ... print('handler: ' + repr(signal)) ...
Fire signal:
>>> MySignal().fire() handler: MySignal()
Note, that signal propagates over inheritance, i.e. all subscribes of base signal will be called when child signal fired:
>>> @Signal.subscribe ... def base_hadler(signal): ... print('base_handler: ' + repr(signal)) ... >>> MySignal().fire() handler: MySignal() base_handler: MySignal()
Unsubscribe handler:
>>> MySignal.unsubscribe(handler) >>> MySignal().fire() base_handler: MySignal()
Any keyword argument passed to signal constructor becomes its attribute:
>>> s = Signal(a=1, b=2) >>> s.a 1 >>> s.b 2
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