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| Changed, Enhanced, or Newly Deprecated Features |
Changed, Enhanced, or Newly Deprecated Features |
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| - Added 'config.Fallback()' convenience class for redirecting property lookups |
- The 'referencedType' of a 'model.StructuralFeature' can now be any |
| from one namespace to another. See 'peak.ini' for usage examples. |
'binding.IComponentKey', not just a type or a string. Types are also now |
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implicitly component keys, which means you can use 'binding.Obtain(SomeType)' |
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to look up 'SomeType'. (Right now, this is no different than using 'SomeType' |
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without the 'binding.Obtain()', but in future releases this will use a |
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"class replacement service" to allow easy replacement of model and other |
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collaborator classes, while implementing AOP-like features.) |
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|
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- Added 'naming.Indirect(key)', a 'binding.IComponentKey' that can be used to |
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do an indirect lookup via another 'IComponentKey' (such as a name). Using |
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'naming.Indirect()', you can replace code like this:: |
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|
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socket = binding.Obtain( |
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lambda self: self.lookupComponent(self.socketURL), |
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adaptTo = [IListeningSocket] |
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) |
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|
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with code like this:: |
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socket = binding.Obtain( |
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naming.Indirect('socketURL'), adaptTo = [IListeningSocket] |
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) |
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|
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- Added 'peak.running.supervisor', a mini-framework for pre-forking, |
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multiprocess servers, such as for FastCGI. The framework includes a ZConfig |
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schema for process supervisors, and support for automatically forking new |
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children (up to a predefined maximum, with a minimum interval between |
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launches) when a socket has pending connections and all of its child |
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processes are busy. With this setup, you can take more advantage of |
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multiprocessor machines for CPU-intensive services. |
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|
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- Standardized these characteristics of name and address syntax: |
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* '//' at the beginning of URL bodies is *mandatory* when the URL begins |
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with an "authority" as described by RFC 2396. When the URL is not |
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required to contain an authority (e.g. 'peak.storage.SQL.GenericSQL_URL'), |
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the '//' is *optional*, and the canonical form of the URL will not include |
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it. |
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* Standardized names for RFC 2396 fields: 'user', 'passwd', 'host', and |
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'port'. |
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|
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- Added 'peak.metamodels.ASDL', a metamodel for the Zephyr Abstract Syntax |
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Description Language. ASDL is a convenient way to describe a domain model |
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for an abstract syntax tree (AST), and the models generated with the new |
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ASDL tool can be combined with concrete syntax to create a complete parsing |
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solution for "mini languages", possibly including the Python language |
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itself. (Future versions of the Python and Jython compilers are likely to |
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use AST models based on ASDL, and in the current Python CVS sandbox there's |
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already an ASDL model of Python's AST available.) |
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|
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- Enhanced 'fmtparse' and 'peak.model' to allow using types as syntax rules |
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for parsing, including abstract types. An abstract type's syntax is the |
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union (using 'fmtparse.Alternatives') of the syntaxes of its subclasses |
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(as specified by 'mdl_subclassNames'). |
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|
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- Added 'IMainLoop.setExitCode()' and 'IMainLoop.childForked()' methods, to |
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allow reactor-driven components to control the mainloop's exit code. |
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|
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- DEPRECATED 'peak.util.signal_stack'. Instead, bind to a |
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'running.ISignalManager' and use its 'addHandler()/removeHandler()' methods. |
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This has the same effect as 'pushSignals()' and 'popSignals()', except that |
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you do not have to remove handlers in the same order as you add them, and |
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*all* active handlers are invoked for a given signal that they handle. |
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|
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- Added 'IBasicReactor.crash()', which forces an immediate reactor loop exit, |
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ignoring pending scheduled calls. |
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- Added 'peak.running.commands.runMain()', a convenience function for starting |
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an application's "main" command, that also makes it easy for forked child |
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processes to exit and replace the parent process' "main". The 'peak' script |
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has now been shortened to:: |
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|
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from peak.running import commands |
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commands.runMain( commands.Bootstrap ) |
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|
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so it's now much easier to create alternative startup scripts, if you need |
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to, or to add an 'if __name__=="__main__"' clause to a module. |
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|
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- Added 'peak.util.mockdb', a "mock object" implementation of a DBAPI 2.0 |
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driver module. 'mockdb' connections can be told to 'expect()' queries |
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and 'provide()' data to their callers, and will raise AssertionErrors when |
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they are used in a way that doesn't conform to your supplied expectations. |
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This is intended to be used for unit testing components that depend on |
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a database connection: you can verify that they send the right SQL, and |
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you can provide them with dummy data to use. There is also a 'mockdb:' URL |
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and peak.storage driver, so you can easily use a mock DB connection in place |
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of a real one within a PEAK application, for testing purposes. Note, |
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however, that 'peak.util.mockdb' is a DBAPI 2.0 driver in itself, and thus |
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can also be used to test DBAPI usage outside of PEAK. |
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|
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- SQL connection objects now provide an 'appConfig' attribute that is a |
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driver-specific 'config.Namespace()'. This allows you to easily set up |
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configuration properties that are driver-specific. For example, you could |
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use properties to configure driver-specific SQL snippets, then access them |
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via the connection's 'appConfig' namespace. The namespaces are of the form |
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'DRIVER.appConfig', where 'DRIVER' is the name of the DBAPI module for that |
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connection type (e.g. 'pgdb', 'cx_Oracle', etc.). |
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|
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- Added 'config.Namespace()' convenience class for redirecting property |
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lookups from one namespace to another. See the docstring and 'peak.ini' for |
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usage examples. 'PropertyName.of()' now returns 'Namespace' instances |
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instead of 'PropertySet' instances. |
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|
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- DEPRECATED the 'config.PropertySet' class; please convert to using |
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'config.Namespace', as it will disappear in the 0.5alpha4 release cycle. |
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| - SQL connection objects now get their type converters from a distinct |
- SQL connection objects now get their type converters from a distinct |
| property namespace for each DBAPI driver. For example a driver using the |
property namespace for each DBAPI driver. For example a driver using the |
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| Corrected Problems |
Corrected Problems |
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|
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- 'peak.running.commands.CGICommand' could become confused on certain BSD |
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variants (such as Mac OS/X), and assume it was running under FastCGI, even |
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if it wasn't. (Because the operating systems in question use socket pairs |
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to implement pipes.) |
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|
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- Fixed some problems with the test suite when running under Python 2.3. |
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PEAK itself worked fine, but the test suite was bitten by two minor |
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semantic changes that took effect in 2.3, resulting in lots of error |
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messages about ModuleType needing a parameter, and a test failure for |
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'checkClassInfo' in the 'FrameInfoTest' test class. |
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| - Transaction participants that raised an error in their 'abortTransaction()' |
- Transaction participants that raised an error in their 'abortTransaction()' |
| method, would not receive a 'finishTransaction()' call, the error was |
method, would not receive a 'finishTransaction()' call, the error was |
| passed through to the transaction service's caller, and later participants |
passed through to the transaction service's caller, and later participants |
Diff of /PEAK/CHANGES.txt
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Revision Log