Python module implementing the observer pattern using a centralized registry
Neo-Observer is a Python module implementing the observer pattern using a centralized registry. You send an event to the registry and it will dispatch the call the registered observers of the event. You can register functions or subclasses of a defined observable interface. Events have a name, a sender and optional info object. You can register an observable to receive an event based on its name, sender or both. Require Python 2.5 and higher (excluding Python 3).
2015-06-05: 1.0.1 Dib push the doc on Github. No more wiki and wiki project. Updated REAME.
2011-04-19: To remove any ambiguity, adding the same observer again cancel the previous registration.
2011-04-19: New improved version
- Use weak references whenever it is possible. Objects no longer referenced by your code will not receive events so you don’t have to remember to call ‘remove_observer’.
- Any callable can be used as an observer as long as the callable can be called with the single event argument or without argument at all.
- When adding an observer, you can specify the method to be called on the observer to receive the event.
- Implementation changes: Using a type hierarchy instead of a type flag for the different types of observers.
While I was having a centralized registry in mind when I was creating this class, I realize that ObserverRegistry can work in a decentralized way too. Any class derived from ObserverRegistry is an ObserverRegistry too (just don’t forget to call init).
Author: Pierre Thibault (pierre.thibault1 -at- gmail.com)
Project site: https://github.com/Pierre-Thibault/neo-observer
Epydoc documentation: https://pierre-thibault.github.io/neo-observer/
Join the user group: http://groups.google.com/group/neo-users
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