| Fixes and Enhancements since Version 0.5 alpha 1 |
Fixes and Enhancements since Version 0.5 alpha 1 |
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Changed, Enhanced, or Newly Deprecated Features |
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- Added a ZConfig schema for 'running.commands.EventDriven' applications, |
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a ZConfig component definition for adaptive tasks, and a running shortcut |
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called 'EventDriven'. It should now be possible to do this:: |
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#!/usr/bin/env peak EventDriven |
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at the top of a ZConfig file formatted according to the new schema, and |
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have it run. Unfortunately, so far the only type of task that can be |
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included is 'running.daemons.AdaptiveTask', which doesn't actually *do* |
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anything. |
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- Added 'zconfig.schema' URL scheme that loads an enhanced ZConfig schema |
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object that can act as a command line interpreter using the 'peak' script. |
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To use it, run 'peak zconfig.schema:urlToSchema urlOfConfig'. Or, add |
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a line like this:: |
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#!/usr/bin/env peak zconfig.schema:pkgfile:some.package/schema.xml |
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to the top of a configuration file, and make the configuration file |
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executable. Note that the schema specified must convert to an object |
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that's usable with the commands bootstrap framework. Also note that |
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if you have a local PEAK_CONFIG file, you can add a 'peak.running.shortcuts' |
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entry to shorten the URL reference in your #! line. E.g.:: |
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#!/usr/bin/env peak mySchema |
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will suffice if you have defined 'peak.running.shortcuts.mySchema' as |
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'naming.LinkRef("zconfig.schema:pkgfile:some.package/schema.xml")'. |
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There is also a 'peak ZConfig urlOfSchema urlOfConfig' variant, that was |
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added to support putting '#!/usr/bin/env peak ZConfig' at the top of |
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schema files, but unfortunately that's not valid XML. |
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- Standardized file-based URL syntaxes (e.g logfiles and lockfiles) to |
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follow RFC 1738/2396, and Python 'urllib'. This shouldn't affect much |
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besides the canonical forms of the URLs. Added 'pkgfile:some.pkg/filepath' |
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URL syntax for ease of referring to files near modules. (A convenience |
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intended mainly for referencing ZConfig schemas.) |
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- Added the UML 1.4 metamodel, and thus the ability to load UML 1.4 |
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models encoded in XMI 1.1. |
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- Added support in the mof2py code generator for "unprefixing" enumerated |
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values, so that UML and other metamodels' enumerations work correctly |
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when loading from XMI. |
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- 'binding.Acquire()' now accepts a 'default' value argument, and |
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'binding.New()' no longer accepts the 'bindToOwner' flag. |
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- There is a new 'binding.IComponentKey' interface that is used to implement |
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'IComponent.lookupComponent()'. Now you can implement this interface, |
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or create an adapter for it, in order to make an object usable as an |
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argument to 'binding.lookupComponent()' - and therefore usable as a key |
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for 'binding.bindTo()' or 'binding.bindToSequence()'. Not that it's |
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necessarily very useful to do so; you're probably better off simply |
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creating a naming scheme. But it might be useful for lookups done |
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in the context of classes, since naming schemes aren't usable there. |
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(It was actually added in order to factor out all the type testing that |
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'lookupComponent' used to do, so it doesn't matter if it's useful for |
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much else.) |
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- PEAK has been refactored to avoid the use of 'isImplementedBy()' and |
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similar introspection, in favor of 'adapt()'. As a result, some |
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'peak.naming' interfaces have changed. This should not affect you |
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if you are only subclassing PEAK-provided naming components and not |
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implementing these interfaces "from scratch". However, the various |
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'isAddress', 'isAddressClass', 'isResolver', and 'isName' APIs have |
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also been removed, as they were based on 'isImplementedBy()'. |
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- REMOVED ability to use '__implements__' and '__class_implements__' to |
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declare support for interfaces. Use 'protocols.advise()' or a related |
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API to do this now. The 'protocols' package is available automatically |
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from 'peak.api'. |
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Similarly, the ability to use 'isImplementedBy()' with interfaces declared |
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by PEAK is REMOVED. You can still use 'isImplementedBy()' with Zope |
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interfaces, of course, but we recommend you switch to 'adapt()', which |
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should work with both PEAK and Zope interfaces. |
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- Replaced all use of 'zope.interface' with 'protocols' package because |
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the 'protocols' package: |
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* is considerably smaller and simpler than 'zope.interface' |
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* produces Interface objects that can be inspected with the Python |
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'pydoc' and 'help()' tools |
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* supports and implements the PEP 246 'adapt()' protocol |
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* transparently supports transitive adaptation - i.e. if adapter AB |
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adapts from A to B, and adapter BC adapts from B to C, then an adapt(x,C) |
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where 'x' is an 'A', will be implemented as BC(AB(x)). |
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* Supports "open protocols" that allow you to "superclass" a protocol |
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to create a subset protocol; objects that support the first protocol |
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will automatically support the subset protocol. For example, if one |
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person defines a "dictionary" protocol, someone else can create a |
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"read-only dictionary" protocol, and all objects supporting the |
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"dictionary protocol" will be considered to implement the "read-only |
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dictionary" protocol. |
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* can interoperate with other interface packages, including Zope's, but |
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does not require them |
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* works with module inheritance (for everything but moduleProvides(), and |
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we should get to that by 0.5a2) |
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* lets you use Interfaces as abstract base classes (i.e., you can |
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inherit from an interface and turn it into an implementation, and |
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you can define default attribute values or method implementations in |
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your interfaces |
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* Lets you mix interface declarations from any number of frameworks and |
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any number of interface types, in a single 'implements()' or |
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'classProvides()' |
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* uses adaptation as the fundamental approach to dealing with interfaces, |
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and avoids the use of 'isImplementedBy()'. In the *rare* case that you |
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need to introspect rather than adapt, you can always call adapt() and |
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check the result. (But introspection usually means that you're using |
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interfaces as a form of metadata; it's better to create an explicit |
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interface that provides the metadata you seek, and adapt to that |
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interface, than to use interfaces as data.) |
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Most of these features are unavailable in 'zope.interface', and some have |
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been declared by the Zope Pope to be unacceptable or undesirable features |
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for Zope interfaces. (Others may be available in some form in future |
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versions of Zope X3.) So, we no longer require or distribute |
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'zope.interface'. |
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- The signatures of the 'getObjectInstance()', 'getStateToBind()', and |
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'getURLContext()' methods in the 'peak.naming' package have changed, to |
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place the context or parent component as the first, non-optional argument. |
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(If you don't know what these methods are for, you don't need to do anything |
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about this, as they are part of the naming package's extensibility |
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framework.) |
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- 'binding.bindTo()' now accepts a 'default=' argument, whose value will be |
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used in case of a 'NameNotFound' error. |
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| - DEPRECATED 'naming.ParsedURL'. It will disappear in 0.5 alpha 3 or beta. |
- DEPRECATED 'naming.ParsedURL'. It will disappear in 0.5 alpha 3 or beta. |
| It is replaced by the new 'naming.URL.Base'. The 'naming.URL' package |
It is replaced by the new 'naming.URL.Base'. The 'naming.URL' package |
| provides a new URL parsing framework based on 'peak.model'. Upgrading from |
provides a new URL parsing framework based on 'peak.model'. Upgrading from |
| 'ParsedURL' to 'URL.Base' is trivial for ParsedURL subclasses that used |
'ParsedURL' to 'URL.Base' is trivial for ParsedURL subclasses that used |
| only the 'scheme' and 'body' fields, and in fact may not require any |
only the 'scheme' and 'body' fields, and in fact may not require any |
| changes except for the choice of base class. |
changes except for the choice of base class. Also, the 'retrieve()' method |
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of URLs is deprecated; please begin defining the 'getObjectInstance()' |
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method instead. This is to cut down a bit on the number of ways that the |
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naming package spells the idea of retrieving something! |
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| For more complex URL classes, the '__init__' methods go away, 'parse' |
For more complex URL classes, the '__init__' methods go away, 'parse' |
| methods change slightly, and explicit field definitions (using |
methods change slightly, and explicit field definitions (using |
| '_getConfigData', 'getComponentName', or 'notifyUponAssembly', you need |
'_getConfigData', 'getComponentName', or 'notifyUponAssembly', you need |
| to wrap them with 'binding.metamethod' now. |
to wrap them with 'binding.metamethod' now. |
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- Made 'NOT_GIVEN' and 'NOT_FOUND' recognizable by humans (they 'repr' |
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and 'str' to their names) and by Python (they can be pickled, and |
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when restored they come back as the same object). |
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Corrected Problems |
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- Fixed a problem in ZConfig 'schema.dtd'; I used 'PCDATA' where I should've |
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used 'CDATA'. |
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- Fixed misc. problems with 'fromZConfig()' component constructor |
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- Fixed source distributions missing essential setup files |
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- Fixed a problem with assembly events, where a parent component that didn't |
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need assembly notification, wouldn't ever notify its children of assembly |
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if they requested the notification after the parent had already received |
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it. |
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- Fixed 'naming.lookup()' and related APIs not setting the parent component |
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of created objects without an explicitly supplied 'creationParent' keyword |
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argument. This used to "sort of work" when we had implicit configuration |
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parents, but was broken when we went "all explicit" for 0.5 alpha 1. |
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- Fixed a problem where initializing single-valued immutable fields of |
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'peak.model' types did not perform type/value normalization. |
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- Fixed a problem where bindTo would use the attribute name as the |
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default value for a lookup, if the requested name/property/utility |
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was not found. |
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| - Fixed 'mof2py' generator script not working |
- Fixed 'mof2py' generator script not working |
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| - Fixed model.Element not getting parent component set when passed as a |
- Fixed model.Element not getting parent component set when passed as a |
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| - Fixed IndentedStream generating all-whitespace lines |
- Fixed IndentedStream generating all-whitespace lines |
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| - Made 'NOT_GIVEN' and 'NOT_FOUND' recognizable by humans (they 'repr' |
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| and 'str' to their names) and by Python (they can be pickled, and |
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| when restored they come back as the same object). |
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Diff of /PEAK/CHANGES.txt
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