SuperCollider CLASSES

NotificationCenter

let an object emit notifications
Inherits from: Object

Description

One common OOP pattern is Model-View-Controller where one object (the controller) is a dependant of the model. Every time the model changes it notifies all of its dependants. In this case the model has a dictionary of dependants and iterates through those.

Another common pattern is NotificationCenter wherein an object emits a notification and clients can register functions that will be executed when that notification happens.

A Server emits a \newAllocators notification when it creates new node and bus allocators which it does when it quits or boots.

NotificationCenter.notify(Server.default, \newAllocators);

You can listen for this:

NotificationCenter.register(Server.default, \newAllocators, yourself, {
    // throw away all your node variables
    // or stop the music
});

The Buffer class register a function to clear its info cache whenever a server restarts. The server is emitting changed messages quite often (every 0.4 secs for the status updates), and the Buffer class is only interested in boot/quit events, so this is a more lightweight system for this purpose.

Class Methods

*notify (object, message, args)

The object emits a message and may also pass extra args.

*register (object, message, listener, action)

An interested client can register the action function for the object/message notification. A listener may only register one action per object/message notification.

*unregister (object, message, listener)

Remove the registrations.

*registerOneShot (object, message, listener, action)

After the notification has been emitted and handled, automatically unregister.

*registrationExists (object, message, listener)

Simply confirms if a registration is already in place.

Inherited class methods

Undocumented class methods

*clear

*removeForListener (listener)

Instance Methods

Inherited instance methods