pyre.patterns.Observable

Module Contents

class pyre.patterns.Observable.Observable(**kwds)

Provide notification support for classes that maintain dynamic associations with multiple clients.

Observers, i.e. clients of the Observable, register event handlers that will be invoked to notify them whenever something interesting happens to the Observable. The nature of what is being observed is defined by Observable descendants and their managers. For example, instances of pyre.calc.Node are observable by the other nodes whose value depends on them. These dependents are notified of value changes and forced to refresh their value cache.

The event handlers are callables that take the observable instance as their single argument.

interface:

addObserver: registers its callable argument with the list of handlers to invoke removeObserver: remove an event handler from the list of handlers to invoke notifyObservers: invoke the registered handlers in the order in which they were registered

observers

notifyObservers(self, **kwds)

Notify all observers

addObserver(self, callback)

Add {callback} to the set of observers

removeObserver(self, callback)

Remove {callback} from the set of observers