Initial commit. Still building up the env and some parsing code.

python/packages/sqlobject/include/pydispatch/robust.py

@@ -0,0 +1,57 @@
+"""Module implementing error-catching version of send (sendRobust)"""
+from dispatcher import Any, Anonymous, liveReceivers, getAllReceivers
+from robustapply import robustApply
+
+def sendRobust(
+	signal=Any, 
+	sender=Anonymous, 
+	*arguments, **named
+):
+	"""Send signal from sender to all connected receivers catching errors
+	
+	signal -- (hashable) signal value, see connect for details
+
+	sender -- the sender of the signal
+	
+		if Any, only receivers registered for Any will receive
+		the message.
+
+		if Anonymous, only receivers registered to receive
+		messages from Anonymous or Any will receive the message
+
+		Otherwise can be any python object (normally one
+		registered with a connect if you actually want
+		something to occur).
+
+	arguments -- positional arguments which will be passed to
+		*all* receivers. Note that this may raise TypeErrors
+		if the receivers do not allow the particular arguments.
+		Note also that arguments are applied before named
+		arguments, so they should be used with care.
+
+	named -- named arguments which will be filtered according
+		to the parameters of the receivers to only provide those
+		acceptable to the receiver.
+
+	Return a list of tuple pairs [(receiver, response), ... ]
+
+	if any receiver raises an error (specifically any subclass of Exception),
+	the error instance is returned as the result for that receiver.
+	"""
+	# Call each receiver with whatever arguments it can accept.
+	# Return a list of tuple pairs [(receiver, response), ... ].
+	responses = []
+	for receiver in liveReceivers(getAllReceivers(sender, signal)):
+		try:
+			response = robustApply(
+				receiver,
+				signal=signal,
+				sender=sender,
+				*arguments,
+				**named
+			)
+		except Exception, err:
+			responses.append((receiver, err))
+		else:
+			responses.append((receiver, response))
+	return responses