class ReactiveQueueTask(object):
def __init__(self, func, args, kwargs):
self.func = func
self.args = args
self.kwargs = kwargs
self.deferred = Deferred()
def __call__(self):
return self.func(*self.args, **self.kwargs)
def resolve(self, ret):
self.deferred.callback(ret)
def reject(self, error):
self.deferred.errback(error)
def findNode(self, id, callback, errback=None):
""" returns the contact info for node, or the k closest nodes, from the global table """
# get K nodes out of local table/cache, or the node we want
nodes = self.table.findNodes(id, invalid=True)
l = [x for x in nodes if x.invalid]
if len(l) > 4:
nodes = sample(l, 4) + self.table.findNodes(id, invalid=False)[:4]
d = Deferred()
if errback:
d.addCallbacks(callback, errback)
else:
d.addCallback(callback)
if len(nodes) == 1 and nodes[0].id == id:
d.callback(nodes)
else:
# create our search state
state = FindNode(self, id, d.callback, self.rawserver.add_task)
self.rawserver.external_add_task(0, state.goWithNodes, nodes)
def findNode(self, id, callback, errback=None):
""" returns the contact info for node, or the k closest nodes, from the global table """
# get K nodes out of local table/cache, or the node we want
nodes = self.table.findNodes(id, invalid=True)
l = [x for x in nodes if x.invalid]
if len(l) > 4:
nodes = sample(l , 4) + self.table.findNodes(id, invalid=False)[:4]
d = Deferred()
if errback:
d.addCallbacks(callback, errback)
else:
d.addCallback(callback)
if len(nodes) == 1 and nodes[0].id == id :
d.callback(nodes)
else:
# create our search state
state = FindNode(self, id, d.callback, self.rawserver.add_task)
self.rawserver.external_add_task(0, state.goWithNodes, nodes)
from defer import Deferred
__author__ = 'cqh'
def myCallback(result):
print result
def myErrback(err):
print err
d=Deferred()
d.add_callback(myCallback)
#d.add_errback(myErrback)
d.callback("Trigger callback.")
from defer import Deferred
__author__ = 'cqh'
def callback1(result):
print "Callback 1 said:",result
return result
def callback2(result):
print "Callback2 said:",result
def callback3(result):
raise Exception("Callback 3")
def errback1(failure):
print "Errback 1 had an an error on ,",failure
return failure
def errback2(failure):
raise Exception("Errback 2")
def errback3(failure):
print "Errback3 took care of ",failure
return "Everything is fine now."
d=Deferred()
d.add_callback(callback1)
d.add_callback(callback2)
d.add_callbacks(callback3,errback1)
d.add_errback(errback3)
d.callback("Test")
