[Zope3-checkins] CVS: Zope3/lib/python/Zope/App/DependencyFramework - Dependable.py:1.1 IDependable.py:1.1 __init__.py:1.1

[Jim Fulton]

Update of /cvs-repository/Zope3/lib/python/Zope/App/DependencyFramework
In directory cvs.zope.org:/tmp/cvs-serv3186

Added Files:
	Dependable.py IDependable.py __init__.py 
Log Message:
Begining implementation of dependency framework.


=== Added File Zope3/lib/python/Zope/App/DependencyFramework/Dependable.py ===
##############################################################################
#
# Copyright (c) 2002 Zope Corporation and Contributors.
# All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
# 
##############################################################################
"""
$Id: Dependable.py,v 1.1 2002/10/14 11:51:05 jim Exp $
"""

__metaclass__ = type

from Persistence import Persistent
from Zope.App.DependencyFramework.IDependable import IDependable

class Dependable:
    __doc__ = IDependable.__doc__

    __implements__ =  IDependable

    def __init__(self):
        self.__dependents = {}

    def addDependent(self, location):
        "See Zope.App.DependencyFramework.IDependable.IDependable"
        self.__dependents[location] = 1
        self._p_changed = 1

    def removeDependent(self, location):
        "See Zope.App.DependencyFramework.IDependable.IDependable"
        del self.__dependents[location]
        self._p_changed = 1

    def dependents(self):
        "See Zope.App.DependencyFramework.IDependable.IDependable"
        return list(self.__dependents)


=== Added File Zope3/lib/python/Zope/App/DependencyFramework/IDependable.py ===
##############################################################################
#
# Copyright (c) 2002 Zope Corporation and Contributors.
# All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
# 
##############################################################################
"""
$Id: IDependable.py,v 1.1 2002/10/14 11:51:05 jim Exp $
"""

from Interface import Interface

class IDependable(Interface):
   """Objects that can have dependencies
   """

   def addDependent(location):
       """Add a dependency to a dependent object by location

       The location is the physical path to the object.
       """
   def removeDependent(location):
       """Remove a dependency with a dependent object by location.

       The location is the physical path to the object.
       """
   def dependents():
       """Return a sequence of dependent object locations.
       """
__doc__ = IDependable.__doc__ + __doc__


=== Added File Zope3/lib/python/Zope/App/DependencyFramework/__init__.py ===
##############################################################################
#
# Copyright (c) 2002 Zope Corporation and Contributors.
# All Rights Reserved.
# 
# This software is subject to the provisions of the Zope Public License,
# Version 2.0 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
# 
##############################################################################
"""Dependency Framework

  Problem 

    Objects sometimes depend on other objects without the cooperation
    of the objects being depended upon.  For example, service
    directives depend on services. It is important to avoid deleting
    services if there are dependent service directives. We want to
    avoid adding dependency checks to every service implementation,

  Proposal

    A generic dependecy framework is proposed.   Objects that are
    depended on should implement IDependable.

$Id: __init__.py,v 1.1 2002/10/14 11:51:05 jim Exp $
"""
__metaclass__ = type