| # Gaudi Framework, version v22r4 |

Home |  | Generated: Fri Sep 2 2011

Public Member Functions

# ConfigurableMeta::ConfigurableMeta Class Reference

this metaclass installs PropertyProxy descriptors for Gaudi properties More...

List of all members.

## Public Member Functions
def | __new__
def | __call__

## Detailed Description

this metaclass installs PropertyProxy descriptors for Gaudi properties

    The setting of Gaudi component properties needs to be deferred and
       history of who set what where needs to be collected. This is done
       by using PropertyProxy descriptors rather than the default ones.

Definition at line 14 of file ConfigurableMeta.py.

## Member Function Documentation

def ConfigurableMeta::ConfigurableMeta::__call__ | ( |  | cls,
|  |  | args,
|  |  | kwargs
| ) |  |

    To Gaudi, any object with the same type/name is the same object. Hence,
       this is mimicked in the configuration: instantiating a new Configurable
       of a type with the same name will return the same instance.

Definition at line 65 of file ConfigurableMeta.py.

    00066                                         :
    00067         """To Gaudi, any object with the same type/name is the same object. Hence,
    00068            this is mimicked in the configuration: instantiating a new Configurable
    00069            of a type with the same name will return the same instance."""
    00070
    00071      # Get the instance: `singleton' logic needs to be in __new__, not here,
    00072      # for compatibililty with pickling.)
    00073         cfg = cls.__new__( cls, *args, **kwargs )
    00074
    00075      # Initialize the object, if not done already.
    00076         if not hasattr(cfg, '_initok') or not cfg._initok:
    00077             cls.__init__( cfg, *args, **kwargs )
    00078
    00079         return cfg

def ConfigurableMeta::ConfigurableMeta::__new__ | ( |  | self,
|  |  | name,
|  |  | bases,
|  |  | dct
| ) |  |

Definition at line 19 of file ConfigurableMeta.py.

    00020                                          :
    00021      # enfore use of classmethod for getType() and setDefaults()
    00022         if 'getType' in dct and not isinstance( dct[ 'getType' ], classmethod ):
    00023             dct[ 'getType' ] = classmethod( dct[ 'getType' ] )
    00024
    00025         if 'setDefaults' in dct and not isinstance( dct[ 'setDefaults' ], classmethod ):
    00026             dct[ 'setDefaults' ] = classmethod( dct[ 'setDefaults' ] )
    00027
    00028      # collect what are properties (basically, any public name; C++ variables
    00029      # shouldn't start with an '_' because of portability constraints, hence
    00030      # it is safe to assume that any such vars are python private ones)
    00031         newclass = type.__new__( self, name, bases, dct )
    00032
    00033      # cache references of instances by name for duplicate removal
    00034         newclass.configurables = {}
    00035
    00036      # loop over slots, which are all assumed to be properties, create proxies, defaults
    00037         properties = {}
    00038         slots = dct.get( '__slots__' )
    00039         if slots:
    00040             props = [ x for x in slots if x[0] != '_' ]
    00041             propDict = dct.get('_propertyDocDct')
    00042             for prop in props:
    00043                 docString = propDict and propDict.get(prop)
    00044                 if type(slots) == dict:
    00045                     default = slots[prop]
    00046                 else:
    00047                     default = None
    00048                 proxy = PropertyProxy.PropertyProxyFactory( getattr( newclass, prop ), docString, default )
    00049
    00050                 properties[ prop ] = proxy
    00051                 setattr( newclass, prop, proxy )
    00052
    00053      # complete set of properties includes those from base classes
    00054         for base in bases:
    00055             try:
    00056                 bprops = base._properties.copy()
    00057                 bprops.update( properties )
    00058                 properties = bprops
    00059             except AttributeError:
    00060                 pass
    00061
    00062         newclass._properties = properties
    00063
    00064         return newclass

The documentation for this class was generated from the following file:

- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v22r4/GaudiKernel/python/GaudiKernel/ConfigurableMeta.py

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