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| Changed, Enhanced, or Newly Deprecated Features |
Changed, Enhanced, or Newly Deprecated Features |
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|
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- 'peak.running.tools' was promoted to 'peak.tools'. 'peak.running.supervisor' |
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was also moved to 'peak.tools.supervisor', and a new 'peak help' command was |
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added in 'peak.tools.api_help'. |
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|
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- Replaced the "[Provide Utilities]" section of .ini files with "[Component |
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Factories]". The new section type is easier to use, much more versatile, |
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and does all registration and imports lazily. See the 'peak.ini' file for |
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docs. "[Provide Utilities]" and 'config.ProvideInstance()' are now |
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DEPRECATED, so please convert ASAP. |
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|
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- 'binding.Make()' now accepts configuration keys, using them to look up a |
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factory object that's then invoked to create the attribute. This makes it |
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a lot easier to define a component with its own transaction service, |
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'IBasicReactor', or other normally "global" component. It also makes it |
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easier to globally specify a factory class for some interface. Factories |
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are looked up under the 'config.FactoryFor(key)' configuration key. (See |
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below.) |
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|
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- Added 'config.FactoryFor(key)', a 'config.IConfigKey' implementation that |
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provides a configuration namespace for factories. |
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|
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When you use 'binding.Make(ISomething)', it's roughly equivalent to:: |
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|
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binding.Make( |
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lambda self,d,a: |
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binding.lookupComponent( |
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self, config.FactoryFor(ISomething), |
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adaptTo = binding.IRecipe |
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)(self,d,a) |
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) |
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That is, the 'config.FactoryFor(ISomething)' is looked up and invoked. |
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|
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- Added 'config.CreateViaFactory(key)', a 'config.IRule' implementation that |
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creates an implementation of 'key', by looking up 'config.FactoryFor(key)' |
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and invoking it. |
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|
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- Added 'config.ruleForExpr(name,expr)', that returns a 'config.IRule' that |
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computes the Python expression in the string 'expr'. This is the mechanism |
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used by configuration files to create rules, factored out into an API call |
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so that configuration extensions can use it, too. |
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|
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- The 'referencedType' of a 'model.StructuralFeature' can now be any |
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'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). |
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|
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Using 'naming.Indirect()', you can replace code like this:: |
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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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|
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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.tools.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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|
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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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|
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- SQL connection objects now get their type converters from a distinct |
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property namespace for each DBAPI driver. For example a driver using the |
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'cx_Oracle' module will get its type converters from the |
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'cx_Oracle.sql_types' property namespace, instead of 'peak.sql_types'. For |
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backward compatibility, these driver-specific namespaces are set up to |
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fall back to 'peak.sql_types' for their defaults. Type converter |
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construction has also been improved, to eliminate conversion overhead |
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completely when no conversions are required for a specific query. Also, |
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SQL connections now offer a method that will create a row conversion |
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function for a given result description and optional postprocessing |
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function. This new method should now be used in place of direct access to |
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the 'typeMap' attribute of connection objects. |
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|
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- Added 'binding.Require', 'binding.Obtain', 'binding.Make', and |
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'binding.Delegate'. *ALL* other binding types are now DEPRECATED, and will |
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go away before 0.5 beta is released: |
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|
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'requireBinding("info")' -- use 'Require("info")' |
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|
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'delegateTo("attr")' -- use 'Delegate("attr")' |
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'New(type)' -- use 'Make(type)' |
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'New("module.type")' -- use 'Make("module.type")' |
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|
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'bindTo(key)' -- use 'Obtain(key)' |
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|
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'Constant(value)' -- use 'Make(lambda: value)' |
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'Acquire(key)' -- use 'Obtain(key, offerAs=[key,])' |
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'Copy(value)' -- use 'Make(lambda: <expr to copy value>)' |
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|
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'whenAssembled(func)' -- use 'Make(func, uponAssembly=True)' |
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|
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'bindSequence(key1,key2,...)' -- use 'Obtain([key1,key,...])' |
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|
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'bindToProperty(x,y)' -- use 'Obtain(PropertyName(x),default=y)' |
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'bindToParent()' -- use 'Obtain("..")' |
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'bindToSelf()' -- use 'Obtain(".")' |
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'bindToUtilities()' -- no replacement; let me know if you're using this. |
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Note that 'Make' and 'Obtain' also support sequences of recipes and keys, |
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and in those cases will produce a sequence of the results from those recipes |
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or keys. Also, 'Make' will accept no-argument and one-argument callables, |
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where 'Once' always required three-argument functions. This should make it |
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a lot easier to write short binding functions. |
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|
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Also, note that the 'activateUponAssembly' keyword is now 'uponAssembly', |
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and 'isVolatile' is now 'noCache'. (The old names will work as keyword |
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arguments until the alpha 4 development cycle begins.) The |
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'binding.IActiveDescriptor' interface also changed as a result of this. |
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Last, but not least, a 'binding.IRecipe' interface was added, to support the |
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new 'binding.Make' type. |
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|
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- Added a 'lockName' attribute to 'runnning.AdaptiveTask', and a 'LockURL' |
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setting to its ZConfig schema. This allows a lockfile URL to be specified |
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for adaptive tasks that need exclusive access to some resource while |
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running. |
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|
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- A list or tuple of 'IComponentKey' instances is now treated as a single |
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component key, that returns a tuple of the values returned by each |
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constituent component key. This means that 'binding.Obtain()' and |
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'lookupComponent()' can now accept a list or tuple of component keys. This |
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makes 'bindSequence()' obsolete, so 'bindSequence()' is now DEPRECATED. |
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'binding.bindSequence(key1,key2,...)' can now be replaced with |
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'binding.Obtain([key1,key,...])', and will produce the same results. |
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|
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- 'naming.IBasicContext.lookup()' and 'naming.lookup()' now accept a 'default' |
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argument, similar to that used by 'lookupComponent()' and most other |
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lookup-like APIs in PEAK. This change was made so that component lookups |
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don't need to rely on catching 'exceptions.NameNotFound' errors to tell them |
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when to use the default value. This could hide 'NameNotFound' errors that |
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were actually from a broken component somewhere in the lookup process. (In |
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general, it's probably a bad idea to have an exception that's used for both |
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control flow and real errors!) |
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|
| - Added new 'version' tool that automatically edits files to update version |
- Added new 'version' tool that automatically edits files to update version |
| information in them. Just execute the 'version' file in the main PEAK |
information in them. Just execute the 'version' file in the main PEAK |
| source directory. (Use '--help' for help.) You can use this tool with your |
source directory. (Use '--help' for help.) You can use this tool with your |
| file that describes your project's version numbering scheme(s), formats, |
file that describes your project's version numbering scheme(s), formats, |
| and the files that need to be edited, while the 'version.dat' file contains |
and the files that need to be edited, while the 'version.dat' file contains |
| the current version number values. Source for the tool, including the |
the current version number values. Source for the tool, including the |
| configuration file schema, is in the 'peak.running.tools.version' package. |
configuration file schema, is in the 'peak.tools.version' package. |
| (Error handling and documentation, alas, are still minimal.) |
(Error handling and documentation, alas, are still minimal.) |
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|
| - Added new 'Alias' command in 'peak.running.commands'. An 'Alias' instance |
- Added new 'Alias' command in 'peak.running.commands'. An 'Alias' instance |
| 'findComponent()', to better distinguish it from 'lookup()' in |
'findComponent()', to better distinguish it from 'lookup()' in |
| 'naming.IBasicContext', which does something very different. |
'naming.IBasicContext', which does something very different. |
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| - 'binding.bindTo()' and 'binding.bindSequence()' now pre-adapt their |
- 'binding.Obtain()' (formerly 'binding.bindTo()' and 'binding.bindSequence()') |
| arguments to 'IComponentKey', to speed lookups at runtime, and to ensure |
now pre-adapt their arguments to 'IComponentKey', to speed lookups at |
| that errors due to an unusable parameter type occur at class creation time |
runtime, and to ensure that errors due to an unusable parameter type occur |
| instead of waiting until lookup time. |
at class creation time instead of waiting until lookup time. |
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|
| - The following 'binding' forms are now deprecated, and will go away before |
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| 0.5 beta is released: |
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| 'bindToProperty(x,y)' -- use 'bindTo(PropertyName(x),default=y)' |
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| 'bindToParent()' -- use 'bindTo("..")' |
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| 'bindToSelf()' -- use 'bindTo(".")' |
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| 'bindToUtilities()' -- no replacement; let me know if you're using this. |
|
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|
| - There's a new 'peak.storage.files' module, with handy classes like |
- There's a new 'peak.storage.files' module, with handy classes like |
| 'EditableFile'. 'EditableFile' is a class that lets you edit the contents |
'EditableFile'. 'EditableFile' is a class that lets you edit the contents |
| means you should change 'return foo, None' statements to just 'return foo'. |
means you should change 'return foo, None' statements to just 'return foo'. |
| |
|
| - Property definition rules in an .ini file can now refer to 'rulePrefix' and |
- Property definition rules in an .ini file can now refer to 'rulePrefix' and |
| 'ruleSuffix' variables. 'rulePrefix' is a '.'-terminated string, |
'ruleSuffix' variables. 'rulePrefix' is a "."-terminated string, |
| representing the name the rule was defined with. For example, if the |
representing the name the rule was defined with. For example, if the |
| rule was defined for '"foo.bar.*"', then 'rulePrefix' will be '"foo.bar."'. |
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 |
The 'ruleSuffix' will be the portion of the 'propertyName' that follows |
| 'rulePrefix'. So, if looking up property '"foo.bar.baz"', then the |
'rulePrefix'. So, if looking up property '"foo.bar.baz"', then the |
| '"foo.bar.*"' rule will execute with a 'ruleSuffix' of '"baz"'. This should |
'"foo.bar.*"' rule will execute with a 'ruleSuffix' of '"baz"'. This should |
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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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