utils.notification

Module: utils.notification

Inheritance diagram for IPython.utils.notification:

The IPython Core Notification Center.

See docs/source/development/notification_blueprint.txt for an overview of the notification module.

Authors:

• Barry Wark
• Brian Granger

Classes

NotificationCenter

class IPython.utils.notification.NotificationCenter

Bases: object

Synchronous notification center.

Examples

Here is a simple example of how to use this:

import IPython.util.notification as notification
def callback(ntype, theSender, args={}):
    print ntype,theSender,args

notification.sharedCenter.add_observer(callback, 'NOTIFICATION_TYPE', None)
notification.sharedCenter.post_notification('NOTIFICATION_TYPE', object()) # doctest:+ELLIPSIS
NOTIFICATION_TYPE ...

__init__()

add_observer(callback, ntype, sender)

Add an observer callback to this notification center.

The given callback will be called upon posting of notifications of the given type/sender and will receive any additional arguments passed to post_notification.

Parameters :

callback : callable

The callable that will be called by post_notification() as ``callback(ntype, sender, *args, **kwargs)

ntype : hashable

The notification type. If None, all notifications from sender will be posted.

sender : hashable

The notification sender. If None, all notifications of ntype will be posted.

post_notification(ntype, sender, *args, **kwargs)

Post notification to all registered observers.

The registered callback will be called as:

callback(ntype, sender, *args, **kwargs)

Parameters :

ntype : hashable

The notification type.

sender : hashable

The object sending the notification.

*args : tuple

The positional arguments to be passed to the callback.

**kwargs : dict

The keyword argument to be passed to the callback.

Notes

• If no registered observers, performance is O(1).
• Notificaiton order is undefined.
• Notifications are posted synchronously.

remove_all_observers()

Removes all observers from this notification center

NotificationError

class IPython.utils.notification.NotificationError

Bases: exceptions.Exception

__init__()

x.__init__(...) initializes x; see help(type(x)) for signature

args

message