Publish/Subscribe 'registerChannel'

[juliankrispel]

Do we really need registerChannel to be a public method? This could be called internally whenever setValue is first called for a particular channel.

[ulikk]

Good idea, this will probably make the code easier. I was not sure if strict channel management was a necessity.

[ulikk]

This will spawn some side effects however. Until now you had to properly subscribe to a channel (which had to exist), so the system will notify if you read or write from unknown channels. Automatically registering a channel when you subscribe to it (and it exists) would be an option. The problem with registering a channel on setValue is: how do you set a notification callback then?

[ulikk]

updated behavior:

• unsubscribe() to an unknown channel will register the channel (+ setting the callback)
• setValue() to an unknown channel will register the channel (without setting any callback)
• getValue() to an unknown channel will return null