class Task(Action):
"""
Use deferred to detach action execution from
from caller, allowing registration by caller
to task for getting results asynchronously.
"""
def __init__(self, *args, **kw):
self.deferred = Deferred()
super(Task, self).__init__(*args, **kw)
def get_deferred(self):
return self.deferred
def invoke(self, *args, **kw):
try:
result = super(Task, self).invoke(*args, **kw)
except Exception, error:
msglog.log('broadway', msglog.types.WARN,
"Task '%s' execution failed." % self)
msglog.exception(prefix="handled")
self.deferred.failed(error)
else:
def send_request(self, request):
"""
Send request message.
A Deferred instance is returned immediately, which
can then be used to wait on the response, or to
register a call-back instead.
Value returned via deferred will be the response
message itself.
"""
deferred = Deferred()
self.deferreds[request.getheader("CORID")] = deferred
request.setheader("REPLY-TO", self.responses.geturl())
self.messaging.route(request)
return deferred
def invoke(*args, **kw):
deferred = Deferred()
try:
result = invocable(*args, **kw)
except Exception, error:
deferred.failed(error)
def __init__(self, *args, **kw):
self.deferred = Deferred()
super(Task, self).__init__(*args, **kw)
def receive(self, blocking=True, timeout=None):
with self.synclock:
deferred = Deferred()
self.deferreds.add(deferred)
return deferred.getvalue(blocking, timeout)
def invoke(*args, **kw):
deferred = Deferred()
try:
result = invocable(*args, **kw)
except Exception, error:
deferred.failed(error)
