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Fixes and Enhancements since Version 0.5 alpha 2 |
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Changed, Enhanced, or Newly Deprecated Features |
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- .ini files now support "smart property" objects ('config.ISmartProperty'). |
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If a property rule defined in an .ini file evaluates at runtime to an object |
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that implements 'ISmartProperty', the object will be given a chance to |
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compute a value for the property, in place of being used itself. This helps |
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to simplify definition of complex property rules in .ini files, by allowing |
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the use of helper classes. Also, 'naming.LinkRef' and 'naming.Reference' |
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(indirectly) support this interface, so you can now use them in .ini files |
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to refer to an object via the naming system. (Previously, 'naming.LinkRef' |
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wouldn't do the right thing unless the property was looked up via a |
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'config:' URL, and 'naming.Reference' didn't exist.) |
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- 'peak.util.imports.whenImported()' can now be used even when the specified |
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module has already been loaded. |
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- The naming system no longer has 'objectFactories' and 'stateFactories' as |
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utilities; they have been replaced with new mechanisms involving adaptation. |
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Previously, addresses had a 'retrieve()' method that could be used to |
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retrieve the object defined by the address. Now, to retrieve an object for |
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an address, you must either define a context that processes the address, or |
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the address must have a 'defaultFactory' attribute, which provides a name |
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to be imported to get an 'IObjectFactory' that can construct the referenced |
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object. (This is simpler than it sounds; for URLs that reference |
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ManagedConnections, for example, all you need to do is provide the fully |
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qualified name of the connection class.) |
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Meanwhile, writable naming contexts must have a 'serializationProtocol' |
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attribute, specifying what interface an object should be adapted to before |
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attempting to store it in that context. |
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|
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The naming system no longer processes the 'creationName' keyword argument; |
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this is now considered the sole responsibility of 'peak.binding'. The |
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'IComponent.lookupComponent()' method still accepts the keyword argument, |
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and attribute bindings still handle the creation name transparently. It is |
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just not available via naming system APIs, and naming contexts no longer |
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have to deal with it. |
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|
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The naming system base classes no longer use 'attrs' as an input parameter |
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or return value. If you've subclassed anything from 'peak.naming.contexts', |
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note that your '_get()' methods should now just return the lookup value, |
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rather than a 'state,attrs' tuple. For most naming contexts, this just |
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means you should change 'return foo, None' statements to just 'return foo'. |
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- Property definition rules in an .ini file can now refer to 'rulePrefix' and |
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'ruleSuffix' variables. 'rulePrefix' is a '.'-terminated string, |
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representing the name the rule was defined with. For example, if the |
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rule was defined for '"foo.bar.*"', then 'rulePrefix' will be '"foo.bar."'. |
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The 'ruleSuffix' will be the portion of the 'propertyName' that follows |
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'rulePrefix'. So, if looking up property '"foo.bar.baz"', then the |
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'"foo.bar.*"' rule will execute with a 'ruleSuffix' of '"baz"'. This should |
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make it easier to work with hierarchical property namespaces. |
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- Added simple example scripts and small applications in the 'examples' |
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directory. |
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- There is a new command-line namespace introspection tool, 'n2', which |
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can be accessed by running 'peak n2'. Type 'peak n2 -h' for help. |
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- The PEAK_CONFIG environment variable can now list multiple files, separated |
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by the platform's 'os.pathsep' (e.g. ':' on Unix, ';' on Windows). |
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- It's no longer necessary to provide a '_defaultState()' implementation |
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for an EntityDM: a default implementation is now supplied. |
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- Added automatic installation of 'datetime' package for Python < 2.3. |
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- CGI support has been moved from 'peak.running.zpublish' into |
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'peak.running.commands' (for "raw" CGI/FastCGI) and 'peak.web' (for the |
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PEAK high-level publishing framework). You can use 'peak CGI someName' to |
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adapt 'someName' to a 'running.IRerunnableCGI' and run it as a CGI/FastCGI. |
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- There is now a 'peak.security' package, available from 'peak.api' as |
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'security'. It provides permission management functions: you can define |
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abstract permissions by subclassing 'security.Permission', then create |
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permission checking rules by subclassing 'security.RuleSet', and declare |
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the permissions needed to access attributes of a class with |
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'security.allow()'. The test suite demonstrates a complex application |
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ruleset with dynamic, data-driven permissions. |
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- There is now an interface for "Active Descriptors": |
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'binding.IActiveDescriptor'. 'peak.binding' now uses this interface to |
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identify active descriptors, so you can now create your own. (Previously, |
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'peak.binding' used 'isinstance()' to detect active descriptors.) |
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- REMOVED 'naming.ParsedURL'; it was deprecated as of 0.5 alpha 2. |
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- The 'provides' keyword argument to various 'peak.binding' APIs has been |
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renamed to 'offerAs', and it must be a sequence of configuration keys. |
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(Previously, it accepted either a single key or a tuple of keys.) |
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The signature of 'binding.Constant()' was changed as well; the first |
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positional argument is now the constant value, and 'offerAs' is now a |
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keyword argument. (Previously, 'provides' was the first positional argument |
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of 'binding.Constant()'.) The 'registerProvider()' method of |
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'config.IConfigurable()' also now accepts only a single configuration key, |
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as does 'EigenRegistry.register()'. |
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Also, all 'peak.binding' APIs now only accept positional parameters for |
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items unique to that API. Items common to multiple APIs (such as 'offerAs', |
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'doc', 'attrName', etc.) should now be supplied as keyword arguments. |
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Bindings also now automatically "suggest" the containing object as a parent |
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component for the contained object, whenever a value is assigned to them or |
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computed. If a non-None 'adaptTo' is set on the binding, the value assigned |
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or computed will be adapted to the specified protocol before the parent |
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component is suggested. 'binding.New()' no longer relies on the |
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'IComponentFactory' interface, but instead uses the new adapt/suggest |
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mechanisms. |
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Previously, parent components were only "suggested" when a binding was set |
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via component constructor keyword arguments. Now, this is done at any time |
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bindings are set, but *not* for non-binding keyword arguments. In other |
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words, ordinary attributes of a component do not receive "suggested parent" |
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notices, even when set via constructor keyword arguments. If you want an |
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attribute to do this, you must define the attribute with the binding API; |
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e.g. via 'requireBinding()' or 'binding.Constant()'. If you do *not* want |
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a binding to suggest a parent component, use 'suggestParent=False' in the |
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binding definition. |
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Corrected Problems |
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|
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- There was a typo in peak.naming.arithmetic that caused homogeneous non-URL |
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name subtraction to fail. |
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- The default reactor supplied in 'peak.running.scheduler' would consume |
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CPU continuously if it was waiting for I/O and no tasks were scheduled. |
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- The 'peak.util.imports.whenImported' function didn't work. |
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| 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 |
Changed, Enhanced, or Newly Deprecated Features |
Diff of /PEAK/CHANGES.txt
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Revision Log