def __init__(self):
"""Constructor."""
#: Mapping between identifiers and actual provider instances.
#:
#: The registry itself if a special kind of provider.
#: Every client should have at least one provider identified by
#: "registry".
self.registry = Registry()
# Attach session to registry for reverse relationship.
self.registry.xal_session = self
class Session(object):
"""Base class for XAL sessions.
A XAL session routes execution requests to providers. It uses a registry
to map providers to its members, and optionally a client to transport
requests to the system.
"""
def __init__(self):
"""Constructor."""
#: Mapping between identifiers and actual provider instances.
#:
#: The registry itself if a special kind of provider.
#: Every client should have at least one provider identified by
#: "registry".
self.registry = Registry()
# Attach session to registry for reverse relationship.
self.registry.xal_session = self
def __getattr__(self, name):
"""Return the provider identified by name, using internal registry."""
try:
return self.registry.default(name)
except KeyError:
raise KeyError("'{name}' is not in registry.".format(name=name))
@property
def is_local(self):
"""Return True if session is on local system, i.e. False if remote."""
raise NotImplementedError()