GaudiKernel.ConfigurableMeta.ConfigurableMeta Class Reference

Inheritance diagram for GaudiKernel.ConfigurableMeta.ConfigurableMeta:

Collaboration diagram for GaudiKernel.ConfigurableMeta.ConfigurableMeta:

Public Member Functions
def	__new__ (self, name, bases, dct)
def	__call__ (cls, *args, **kwargs)

Detailed Description

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 25 of file ConfigurableMeta.py.

Member Function Documentation

__call__()

def GaudiKernel.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 78 of file ConfigurableMeta.py.

    def __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."""
 
        # Get the instance: `singleton' logic needs to be in __new__, not here,
        # for compatibililty with pickling.)
        cfg = cls.__new__(cls, *args, **kwargs)
 
        # Initialize the object, if not done already.
        if not hasattr(cfg, "_initok") or not cfg._initok:
            cls.__init__(cfg, *args, **kwargs)
 
        return cfg

__new__()

def GaudiKernel.ConfigurableMeta.ConfigurableMeta.__new__	(		self,
			name,
			bases,
			dct
	)

Definition at line 30 of file ConfigurableMeta.py.

    def __new__(self, name, bases, dct):
        # enfore use of classmethod for getType() and setDefaults()
        if "getType" in dct and not isinstance(dct["getType"], classmethod):
            dct["getType"] = classmethod(dct["getType"])
 
        if "setDefaults" in dct and not isinstance(dct["setDefaults"], classmethod):
            dct["setDefaults"] = classmethod(dct["setDefaults"])
 
        # collect what are properties (basically, any public name; C++ variables
        # shouldn't start with an '_' because of portability constraints, hence
        # it is safe to assume that any such vars are python private ones)
        newclass = type.__new__(self, name, bases, dct)
 
        # cache references of instances by name for duplicate removal
        newclass.configurables = {}
 
        # loop over slots, which are all assumed to be properties, create proxies, defaults
        properties = {}
        slots = dct.get("__slots__")
        if slots:
            props = [x for x in slots if x[0] != "_"]
            propDict = dct.get("_propertyDocDct")
            for prop in props:
                docString = propDict and propDict.get(prop)
                if isinstance(slots, dict):
                    default = slots[prop]
                else:
                    default = None
                proxy = PropertyProxy.PropertyProxyFactory(
                    getattr(newclass, prop), docString, default
                )
 
                properties[prop] = proxy
                setattr(newclass, prop, proxy)
 
        # complete set of properties includes those from base classes
        for base in bases:
            try:
                bprops = base._properties.copy()
                bprops.update(properties)
                properties = bprops
            except AttributeError:
                pass
 
        newclass._properties = properties
 
        return newclass
 

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

• GaudiKernel/python/GaudiKernel/ConfigurableMeta.py