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Kirill Smelkov
Zope
Commits
68794ad8
Commit
68794ad8
authored
Feb 24, 2009
by
Hanno Schlichting
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Some typos and better spelling - beware German-style ahead ;)
parent
86137702
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doc/WHATSNEW.rst
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68794ad8
...
...
@@ -91,19 +91,19 @@ As with every release of Zope2 this version has removed various modules
which have been deprecated in prior versions.
Most notably ZClasses and supporting modules have been removed entirely from
Zope2. As a result the persistent product registry has been
optional, but is
still enabled by default. If your application does not rely on the registry you
can now disable the registry
by specifying::
Zope2. As a result the persistent product registry has been
made optional, but
is still enabled by default. If your application does not rely on the registry,
you can now disable it
by specifying::
enable-product-installation off
inside your `zope.conf` file.
As a result Zope will no longer write any new
transactions to your database during startup
.
inside your `zope.conf` file.
With the option turned off Zope will no longer
write any new transactions to your database during startup in most cases
.
With the upgrade to ZODB 3.9 database-level version support is no longer
available. Many of the modules in
Products.OFSP have been removed as a result.
The low level API to load objects from the database has lost its version
argument as a result of this.
available. Many of the modules in
`Products.OFSP` have been removed as a
result. The low level API to load objects from the database has lost its
version
argument as a result of this.
Documentation updates
...
...
@@ -127,25 +127,26 @@ step in the integration story for Zope components based technology into Zope2.
While integrating the Zope component architecture and its many concepts into
Zope2 an integration layer called Five (Zope 2 + 3) has been created. One of
the major reasons for the necessity of an integration layer has been in the way
Zope2 was tightly coupled to the concept of Acquisition.
Especially the entire
security machinery
has been relying on this.
Zope2 was tightly coupled to the concept of Acquisition.
The entire security
machinery, object traversal and publication
has been relying on this.
All classes, which wanted to interact with Zope2 in any non-trivial way, had to
inherit from the Acquisition base classes. As a result almost no external
package could directly work inside Zope2 but required an integration layer.
With this version of Zope2 classes do have a second option of providing
location awareness to
the Zope API'
s
in
a
transparent
way
.
The
second
option
is
now
the
`
zope
.
location
<
http
://
pypi
.
python
.
org
/
pypi
/
zope
.
location
>`
_
API
as
described
by
the
ILocation
interface
.
location awareness to
Zope API'
s
in
a
transparent
way
.
The
second
option
is
the
`
zope
.
location
<
http
://
pypi
.
python
.
org
/
pypi
/
zope
.
location
>`
_
API
as
described
by
the
ILocation
interface
.
Classes
implementing
this
interface
get
`
__parent__
`
pointers
set
to
their
container
object
,
when
being
put
into
the
container
.
Code
that
operates
on
such
objects
can
then
walk
up
the
containment
hierarchy
by
following
the
pointers
.
In
Acquisition
based
classes
no
information
would
be
stored
on
the
objects
,
but
Acquisition
wrappers
are
constructed
around
the
objects
which
would
hold
the
container
references
.
The
Acquisition
wrapping
relies
on
the
objects
to
provide
an
`
__of__
`
method
as
done
by
the
Acquisition
base
classes
.
Acquisition
wrappers
are
constructed
around
the
objects
instead
.
Only
those
wrappers
would
hold
the
container
references
.
The
Acquisition
wrapping
relies
on
the
objects
to
provide
an
`
__of__
`
method
as
done
by
the
Acquisition
base
classes
.
The
standard
way
of
getting
the
container
of
an
instance
is
to
call
::
...
...
@@ -153,11 +154,11 @@ The standard way of getting the container of an instance is to call::
container
=
aq_parent
(
instance
)
There
are
various
`
aq_
*`
methods
a
round
for
various
other
tasks
related
to
locating
objects
in
the
containment
hierarchy
.
So
far
virtually
all
objects
in
Zope2
would
participate
in
this
Acquisition
and
thus
most
often
people
relied
on
Acquisition
wrappers
to
be
found
around
their
objects
.
This
caused
code
to
rely
on
accessing
the
`
aq_
*`
methods
as
attributes
of
the
wrapper
::
There
are
various
`
aq_
*`
methods
a
vailable
for
various
other
tasks
related
to
locating
objects
in
the
containment
hierarchy
.
So
far
virtually
all
objects
in
Zope2
would
participate
in
Acquisition
.
As
a
side
-
effect
many
people
relied
on
Acquisition
wrappers
to
be
found
around
their
objects
.
This
caused
code
to
rely
on
accessing
the
`
aq_
*`
methods
as
attributes
of
the
wrapper
::
container
=
instance
.
aq_parent
...
...
@@ -172,9 +173,9 @@ it with a proper interface check::
instance = instance.__of__(container)
In addition to this check you should no longer rely on the `aq_*` methods to be
available as attributes
anymore. While all code inside Zope2 itself still
supports this, it does no longer rely on those but makes proper use of the
function
provided by the Acquisition package.
available as attributes
. While all code inside Zope2 itself still supports
this, it does no longer rely on thosem but makes proper use of the functions
provided by the Acquisition package.
To understand the interaction between the new and old approach here is a
little example::
...
...
@@ -253,7 +254,7 @@ Object managers and IContainer
One of the fundamental parts of Zope2 is the object file system as implemented
in the `OFS` package. A central part of this package is an underlying class
called `ObjectManager`. It is a base class of the standard
Folder
used
called `ObjectManager`. It is a base class of the standard
`Folder`
used
for many container-ish classes inside Zope2.
The API to access objects in an object manager or to add objects to one has
...
...
@@ -270,8 +271,8 @@ old API.
>>> IContainer.implementedBy(ObjectManager)
True
You can now write
any of your code in a way that no longer ties it to object
managers
alone, but can support any class implementing IContainer instead. In
You can now write
your code in a way that no longer ties it to object managers
alone, but can support any class implementing IContainer instead. In
conjunction with the Acquisition changes above, this will increase your chances
of being able to reuse existing packages not specifically written for Zope2 in
a major way.
...
...
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