def __getattr__(self, name):
"""Returns node class"""
# FIXME: use create_node here
class_dict = node_dictionary()
node_class = class_dict[name]
constructor = _StreamForkConstructor(self, node_class)
return constructor
def update(self, nodes = None, connections = None):
"""Adds nodes and connections specified in the dictionary. Dictionary might contain
node names instead of real classes. You can use this method for creating stream
from a dictionary that was created from a JSON file, for example.
"""
node_dict = node_dictionary()
# FIXME: use either node type identifier or fully initialized node, not
# node class (Warning: might break some existing code,
# depreciate it first
nodes = nodes or {}
connections = connections or []
for (name, obj) in nodes.items():
if isinstance(obj, Node):
node_instance = obj
elif isinstance(obj, type) and issubclass(obj, Node):
self.logger.warn("Using classes in Stream.update is depreciated")
node_instance = obj()
else:
if not "type" in obj:
raise Exception("Node dictionary has no 'type' key")
node_type = obj["type"]
if node_type in node_dict:
node_class = node_dict[node_type]
node_instance = node_class()
node_instance.configure(obj)
else:
raise Exception("No node class of type '%s'" % node_type)
self.add(node_instance, name)
if connections:
for connection in connections:
self.connect(connection[0], connection[1])