Metadata-Version: 1.0
Name: roles
Version: 0.10
Summary: Role based development
Home-page: http://github.com/amolenaar/roles
Author: Arjan Molenaar
Author-email: gaphor@gmail.com
License: BSD License
Description: Roles
        =====
        
        Library for Role based development.
        
        Pythonic implementation of the DCI (Data Context Interaction) pattern
        (http://www.artima.com/articles/dci_vision.html).
        
        The big difference with mixins is that this role is applied only to the subject
        instance, not to the subject class (alas, a new class is constructed).
        
        Roles can be assigned and revoked. Multiple roles can be applied to an
        instance. Revocation can happen in any particular order.
        
        Homepage: http://amolenaar.github.com/roles
        
        Releases: http://pypi.python.org/pypi/roles
        
        
        Using Roles
        -----------
        
        As a basic example, consider a domain class:
        
        >>> class Person(object):
        ...     def __init__(self, name):
        ...         self.name = name
        >>> person = Person("John")
        
        The instance should participate in a collaboration in which it fulfills a
        particular role:
        
        >>> from roles import RoleType
        >>> class Carpenter(object):
        ...     __metaclass__ = RoleType
        ...     def chop(self):
        ...          return "chop, chop"
        
        Assign the role to the person:
        
        >>> Carpenter(person)				# doctest: +ELLIPSIS
        <Person+Carpenter object at 0x...>
        >>> person					# doctest: +ELLIPSIS
        <Person+Carpenter object at 0x...>
        
        The person is still a Person:
        
        >>> isinstance(person, Person)
        True
        
        ... and can do carpenter things:
        
        >>> person.chop()
        'chop, chop'
        
        See `roles.py <http://github.com/amolenaar/roles/blob/master/roles.py>`_ for more examples.
        
        Context
        -------
        
        Roles make a lot of sense when used in a context. A classic example is the
        money transfer example. Here two accounts are used and an amount of money is
        transfered from one account to the other. So, one account playes the role of
        source account and the other plays the role of target account.
        
        An example can be found in `example.py <http://github.com/amolenaar/roles/blob/master/example.py>`_ and `example2.py <http://github.com/amolenaar/roles/blob/master/example2.py>`_.
        
        
Keywords: role DCI data context interaction
Platform: All
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Natural Language :: English
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Topic :: Software Development :: Libraries
