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events.py
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events.py
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from collections import defaultdict
class StopWaitDispatch(Exception): pass
class StaticValue(object):
def __init__(self, value):
self.value = value
class EarlyValue(object):
def __init__(self, val):
self.val = val
class Waiter(object):
@property
def wait_id(self):
return str(hash(self))
def process_fire(self, given):
return StaticValue(given)
def ready_early(self):
return False
class StringWaiter(str, Waiter):
@property
def wait_id(self):
return str(self)
class WaitPool(object):
'''A structure that manages all `wait`ers, makes sure fired events
get to the right places.
'''
def __init__(self):
self.waits = defaultdict(set)
self.loop_refs = defaultdict(set)
def wait(self, who, what):
if isinstance(what, basestring):
what = StringWaiter(what)
if what.ready_early():
return EarlyValue(what.process_fire(None))
self.waits[what.wait_id].add(who)
self.loop_refs[who].add(what)
return what.wait_id
def fire(self, what, value):
if isinstance(what, basestring):
what = StringWaiter(what)
static = False
for handler in self.waits[what.wait_id]:
if handler.fire_due:
continue
if not static:
try:
value = what.process_fire(value)
except StopWaitDispatch:
break
if type(value) == StaticValue:
static = True
value = value.value
handler.fire_in(what.wait_id, value)
def clear(self, who):
for what in self.loop_refs[who]:
self.waits[what.wait_id].remove(who)
del self.loop_refs[who]