Package rats :: Module observer :: Class Observer

Class Observer

object --+
         |
        Observer

Instances of Observer are notified of changes happening in the Subject instances they are attached to. It's possible for an Observer to watch many Subject.

Instance Methods

[hide private]

__init__(self, subjects)
x.__init__(...) initializes x; see x.__class__.__doc__ for signature

source code

append(self, subject)
Adds a subject to be observed by this Observer instance.

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update(self, origin, key, value)
Called when an attribute of the observed object is changed.

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Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Properties

[hide private]

Inherited from object: __class__

Method Details

[hide private]

init(self, subjects)
(Constructor)

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x.__init__(...) initializes x; see x.__class__.__doc__ for signature

Overrides: object.__init__: (inherited documentation)

update(self, origin, key, value)

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Called when an attribute of the observed object is changed. Should be overridden.

Parameters:

origin (any) - observed object for which the attribute is changed (caller)
key (string) - attribute changed (default to the function that called it. in api.py)
value (any) - value of the attribute after being set

Class Observer

__init__(self, subjects) (Constructor)

update(self, origin, key, value)

init(self, subjects)
(Constructor)