def signal_on_next(a1, a2):
prev_last_ack = last_ack[0]
if isinstance(prev_last_ack, Continue):
new_last_ack = raw_on_next(a1, a2)
elif isinstance(prev_last_ack, Stop):
return stop_ack
else:
def _(v, _):
if isinstance(v, Continue):
with self.lock:
ack = raw_on_next(a1, a2)
return ack
else:
return stop_ack
ack = Ack()
prev_last_ack.flat_map(_).subscribe(ack)
new_last_ack = ack
last_ack[0] = new_last_ack
if isinstance(new_last_ack, Continue) or isinstance(
new_last_ack, Stop):
continue_p[0].on_next(new_last_ack)
continue_p[0].on_completed()
else:
new_last_ack.subscribe(continue_p[0])
# acknowledgment used by input that receives first
continue_p[0] = Ack()
return new_last_ack
def on_next(self, elem):
if not self.is_connected:
def __(v, _):
if isinstance(v, Continue):
ack = self.underlying.on_next(elem)
if isinstance(ack, Continue):
return rx.Observable.just(ack)
elif isinstance(ack, Stop):
raise NotImplementedError
else:
return ack
else:
return Stop()
new_ack = Ack()
self.connected_ack \
.observe_on(self.scheduler) \
.flat_map(__) \
.subscribe(new_ack)
self.connected_ack = new_ack
return self.connected_ack
elif not self.was_canceled:
ack = self.underlying.on_next(elem)
return ack
else:
return Stop()
def push_on_next(self, elem, last_to_push: int = None):
if self.upstream_is_complete or self.downstream_is_complete:
return Stop()
else:
if last_to_push is None:
with self.lock:
to_push = self.items_to_push
self.items_to_push += 1
else:
to_push = last_to_push
if self.back_pressured is None:
if to_push < self.buffer_size:
self.queue.put(item=elem)
self.push_to_consumer(to_push)
return continue_ack
else:
ack = Ack()
with self.lock:
self.back_pressured = ack
self.queue.put(item=elem)
self.push_to_consumer(to_push)
return ack
else:
self.queue.put(item=elem)
self.push_to_consumer(to_push)
return self.back_pressured
def on_next(self, v):
self.received.append(v)
if 0 < self.immediate_continue:
self.immediate_continue -= 1
return Continue()
else:
self.ack = Ack()
return self.ack
def on_next(self, value):
with self.lock:
# concurrent situation with acknowledgment in inner subscription or new subscriptions
# empty inactive subscriptions; they are added to the list once they reach the top of the buffer again
inactive_subsriptions = self.inactive_subsriptions
self.inactive_subsriptions = []
# add item to buffer
self.buffer.append(OnNext(value))
# current ack is used by subscriptions that weren't inactive, but reached the top of the buffer
current_ack = Ack()
self.current_ack = current_ack
is_done = self.is_done
if is_done:
return stop_ack
def gen_inner_ack():
# send notification to inactive subscriptions
for inner_subscription in inactive_subsriptions:
inner_ack = inner_subscription.notify_on_next(value)
yield inner_ack
inner_ack_list = list(gen_inner_ack())
continue_ack = [
ack for ack in inner_ack_list if isinstance(ack, Continue)
]
if 0 < len(continue_ack):
# return any Continue ack
return continue_ack[0]
else:
# return merged acknowledgments from inner subscriptions
ack_list = [current_ack] + inner_ack_list
upper_ack = Ack()
rx.Observable.merge(*ack_list).first().subscribe(upper_ack)
return upper_ack
def on_next(self, inner_left):
ack = Ack()
has_right_elem = False
right_elem = None
with source.lock:
if isinstance(state[0], source.WaitForRightOrInner):
# not much to do
state_typed: source.WaitForRightOrInner = state[0]
state[0] = source.WaitForRight(
inner_left_elem=inner_left,
left_ack=state_typed.left_ack,
inner_left_ack=ack,
left_elem=source.selector_left(left_elem))
elif isinstance(state[0], source.Active):
# send zipped item to observer
state_typed: source.Active = state[0]
has_right_elem = True
right_elem = state_typed.right_elem
state[0] = source.Active(
left_ack=state_typed.left_ack,
right_elem=state_typed.right_elem,
right_ack=state_typed.right_ack,
upper_ack=ack)
elif isinstance(state[0], source.Completed):
return stop_ack
else:
raise NotImplementedError
if has_right_elem:
# send triple to observer
zipped_elem = source.selector(
source.selector_left(left_elem), right_elem,
inner_left)
upper_ack = observer.on_next(zipped_elem)
# race condition with on_completed
if isinstance(state[0], source.Active):
typed_state: source.Active = state[0]
typed_state.upper_ack = upper_ack
if isinstance(upper_ack, Stop):
with source.lock:
state[0] = source.Completed()
else:
def _(v):
if isinstance(v, Stop):
with source.lock:
state[0] = source.Completed()
upper_ack.observe_on(scheduler).subscribe(_)
return upper_ack
else:
return ack
def __init__(self, underlying: Observer, scheduler: SchedulerBase):
self.underlying = underlying
self.scheduler = scheduler
self.root_ack = Ack()
self.connected_ack = self.root_ack
self.connected_ref = None
self.is_connected = False
self.is_connected_started = False
self.scheduled_done = False
self.schedule_error = None
self.was_canceled = False
self.queue = Queue()
self.lock = config['concurrency'].RLock()
def notify_on_next(self, value) -> Ack:
# inner subscription gets only notified if all items from buffer are sent and ack received
with self.source.lock:
# increase current index
self.source.current_index[self] += 1
current_index = self.source.current_index[self]
ack = self.observer.on_next(value)
if isinstance(ack, Continue):
self.source.inactive_subsriptions.append(self)
return ack
elif isinstance(ack, Stop):
# with self.source.lock:
# del self.source.current_index[self]
# if len(self.source.current_ack) == 0:
# self.source.is_done = True
self.signal_stop()
return ack
else:
inner_ack = Ack()
def _(v):
if isinstance(v, Continue):
with self.source.lock:
if current_index + 1 < self.source.buffer.last_idx:
has_elem = True
else:
# no new item has been added since call to 'notify_on_next'
has_elem = False
self.source.inactive_subsriptions.append(self)
if has_elem:
disposable = BooleanDisposable()
self.fast_loop(current_index, 0, disposable)
elif isinstance(v, Stop):
self.signal_stop()
else:
raise Exception(
'no recognized acknowledgment {}'.format(v))
inner_ack.on_next(v)
inner_ack.on_completed()
ack.observe_on(scheduler=self.scheduler).subscribe(_)
return inner_ack
def on_next(v):
def action(_, __):
inner_ack = observer.on_next(v)
if isinstance(inner_ack, Continue):
ack.on_next(inner_ack)
ack.on_completed()
elif isinstance(inner_ack, Stop):
ack.on_next(inner_ack)
ack.on_completed()
else:
inner_ack.unsafe_subscribe(ack)
self.scheduler.schedule(action)
ack = Ack()
return ack
def on_next(self, elem):
stream_error = True
if not is_active[0]:
return stop_ack
else:
async_upstream_ack = Ack()
child = source.selector(elem)
stream_error = False
with source.lock:
state[0] = WaitOnActiveChild()
child_observer = ChildObserver(observer, scheduler, async_upstream_ack, self)
disposable = child.subscribe(child_observer, scheduler, subscribe_scheduler)
with source.lock:
current_state = state[0]
state[0] = Active(disposable)
if isinstance(current_state, WaitOnNextChild):
with source.lock:
state[0] = current_state
state_: WaitOnNextChild = current_state
return state_.ack
elif isinstance(current_state, WaitOnActiveChild):
if is_active[0]:
return async_upstream_ack
else:
self.cancel_state()
return stop_ack
elif isinstance(current_state, Cancelled):
self.cancel_state()
return stop_ack
else:
self.report_invalid_state(current_state, 'on_next')
return stop_ack
def on_next_right(right):
right_elem[0] = right
right_ack[0] = Ack()
with lock:
has_right_elem[0] = True
if has_left_elem[0]:
has_left = True
else:
has_left = False
if has_left:
left = left_elem[0]
if right_is_higher(left, right):
# right is higher than left
# complete inner observable, discard left and request new left; save right
with lock:
# avoids completing observer twice
# discard left element
has_left_elem[0] = False
left_elem[0] = None
if has_completed[0]:
complete_observer = True
else:
complete_observer = False
if complete_observer:
observer.on_completed()
return Stop()
left_ack[0].on_next(continue_ack)
left_ack[0].on_completed()
return right_ack[0]
if right_is_lower(left, right):
# right is lower than left, discard right and request new right
# this is possible in initial phase or if is_lower and is_higher are not tight
# discard right element
has_right_elem[0] = False
right_elem[0] = None
return continue_ack
else:
# left is equal to right, send right element, request new right
# discard right element
has_right_elem[0] = False
right_elem[0] = None
# send right element
ack = observer.on_next(self.selector(left, right))
return ack
else:
# no left element has been yet received; only possible in initial phase
return right_ack[0]
def on_next_left(left_elem):
ack = Ack()
with self.lock:
if isinstance(state[0], self.WaitForLeftOrRight):
new_state = self.WaitForRightOrInner(left_ack=ack)
elif isinstance(state[0], self.WaitForLeft):
state_: source.WaitForLeft = state[0]
new_state = self.Active(left_ack=ack,
right_elem=state_.right_elem,
right_ack=state_.right_ack,
upper_ack=Continue())
elif isinstance(state[0], source.Completed):
return stop_ack
else:
raise NotImplementedError
state[0] = new_state
class ChildObserver(Observer):
def __init__(self, out: Observer, scheduler):
self.out = out
self.scheduler = scheduler
def on_next(self, inner_left):
ack = Ack()
has_right_elem = False
right_elem = None
with source.lock:
if isinstance(state[0], source.WaitForRightOrInner):
# not much to do
state_typed: source.WaitForRightOrInner = state[0]
state[0] = source.WaitForRight(
inner_left_elem=inner_left,
left_ack=state_typed.left_ack,
inner_left_ack=ack,
left_elem=source.selector_left(left_elem))
elif isinstance(state[0], source.Active):
# send zipped item to observer
state_typed: source.Active = state[0]
has_right_elem = True
right_elem = state_typed.right_elem
state[0] = source.Active(
left_ack=state_typed.left_ack,
right_elem=state_typed.right_elem,
right_ack=state_typed.right_ack,
upper_ack=ack)
elif isinstance(state[0], source.Completed):
return stop_ack
else:
raise NotImplementedError
if has_right_elem:
# send triple to observer
zipped_elem = source.selector(
source.selector_left(left_elem), right_elem,
inner_left)
upper_ack = observer.on_next(zipped_elem)
# race condition with on_completed
if isinstance(state[0], source.Active):
typed_state: source.Active = state[0]
typed_state.upper_ack = upper_ack
if isinstance(upper_ack, Stop):
with source.lock:
state[0] = source.Completed()
else:
def _(v):
if isinstance(v, Stop):
with source.lock:
state[0] = source.Completed()
upper_ack.observe_on(scheduler).subscribe(_)
return upper_ack
else:
return ack
def on_error(self, err):
with source.lock:
state[0] = source.Completed()
observer.on_error(err)
def on_completed(self):
back_pressure_right = False
back_pressure_left = False
left_ack = None
right_ack = None
upper_ack = None
complete_observer = False
with source.lock:
if isinstance(state[0], source.Active):
# normal complete
if right_completed[0]:
state[0] = source.Completed()
complete_observer = True
else:
# request new left and new right
state_typed: source.Active = state[0]
back_pressure_right = True
back_pressure_left = True
left_ack = state_typed.left_ack
right_ack = state_typed.right_ack
upper_ack = state_typed.upper_ack
state[0] = source.WaitForLeftOrRight()
elif isinstance(state[0], source.WaitForRightOrInner):
# empty inner observable
state_typed: source.WaitForRight = state[0]
# count up number of inner completed (without right completed)
inner_left_completed[0] += 1
state[0] = source.WaitForLeftOrRight()
back_pressure_left = True
left_ack = state_typed.left_ack
upper_ack = Continue()
if complete_observer:
observer.on_completed()
if back_pressure_left or back_pressure_right:
def _(v):
if isinstance(v, Stop):
with source.lock:
state[0] = source.Completed()
upper_ack.subscribe(_)
if back_pressure_left:
# upper_ack should not be Stop
if isinstance(upper_ack, Continue):
left_ack.on_next(upper_ack)
left_ack.on_completed()
else:
upper_ack.observe_on(scheduler).subscribe(left_ack)
if back_pressure_right:
if isinstance(upper_ack, Continue):
right_ack.on_next(upper_ack)
right_ack.on_completed()
else:
upper_ack.observe_on(scheduler).subscribe(
right_ack)
child = self.selector_inner(left_elem)
child_observer = ChildObserver(observer, scheduler)
disposable = child.subscribe(child_observer, scheduler,
CurrentThreadScheduler())
inner_disposable.disposable = disposable
return ack
def unsafe_subscribe(self, observer, scheduler, subscribe_scheduler):
is_done = [None]
last_ack = [continue_ack]
elem_a1 = [None]
has_elem_a1 = [None]
elem_a2 = [None]
has_elem_a2 = [None]
continue_p = [Ack()]
complete_with_next = [False]
def raw_on_next(a1, a2):
if is_done[0]:
return stop_ack
else:
stream_error = True
try:
c = self.selector(a1, a2)
stream_error = False
ack = observer.on_next(c)
if complete_with_next[0]:
if isinstance(ack, Continue) or isinstance(ack, Stop):
signal_on_complete(False)
else:
ack.observe_on(scheduler).subscribe(
on_completed=lambda: signal_on_complete(False))
except Exception as ex:
if stream_error:
is_done[0] = True
observer.on_error(ex)
return stop_ack
else:
raise
finally:
has_elem_a1[0] = False
has_elem_a2[0] = False
return ack
def signal_on_next(a1, a2):
prev_last_ack = last_ack[0]
if isinstance(prev_last_ack, Continue):
new_last_ack = raw_on_next(a1, a2)
elif isinstance(prev_last_ack, Stop):
return stop_ack
else:
def _(v, _):
if isinstance(v, Continue):
with self.lock:
ack = raw_on_next(a1, a2)
return ack
else:
return stop_ack
ack = Ack()
prev_last_ack.flat_map(_).subscribe(ack)
new_last_ack = ack
last_ack[0] = new_last_ack
if isinstance(new_last_ack, Continue) or isinstance(
new_last_ack, Stop):
continue_p[0].on_next(new_last_ack)
continue_p[0].on_completed()
else:
new_last_ack.subscribe(continue_p[0])
# acknowledgment used by input that receives first
continue_p[0] = Ack()
return new_last_ack
def signal_on_error(ex):
with self.lock:
if not is_done[0]:
is_done[0] = True
observer.on_error(ex)
last_ack[0] = stop_ack
def signal_on_complete(has_elem):
def raw_on_completed():
if not is_done[0]:
is_done[0] = True
observer.on_completed()
with self.lock:
if not has_elem:
if isinstance(last_ack[0], Continue):
raw_on_completed()
elif isinstance(last_ack[0], Stop):
pass
else:
def _(v):
if isinstance(v, Continue):
with self.lock:
raw_on_completed()
else:
pass
last_ack[0].observe_on(scheduler).subscribe(on_next=_)
continue_p[0].on_next(stop_ack)
last_ack[0] = stop_ack
else:
complete_with_next[0] = True
def on_next_left(elem):
with self.lock:
if is_done[0]:
return_ack = stop_ack
else:
elem_a1[0] = elem
if not has_elem_a1[0]:
has_elem_a1[0] = True
if has_elem_a2[0]:
return_ack = signal_on_next(elem_a1[0], elem_a2[0])
else:
return_ack = continue_p[0]
return return_ack
def on_next_right(elem):
with self.lock:
if is_done[0]:
return_ack = stop_ack
else:
elem_a2[0] = elem
if not has_elem_a2[0]:
has_elem_a2[0] = True
if has_elem_a1[0]:
return_ack = signal_on_next(elem_a1[0], elem_a2[0])
else:
return_ack = continue_p[0]
return return_ack
def on_error(ex):
signal_on_error(ex)
def on_completed_left():
return signal_on_complete(has_elem_a1[0])
def on_completed_right():
return signal_on_complete(has_elem_a2[0])
left_observer = AnonymousObserver(on_next=on_next_left,
on_error=on_error,
on_completed=on_completed_left)
d1 = self.left.unsafe_subscribe(left_observer, scheduler,
subscribe_scheduler)
right_observer = AnonymousObserver(on_next=on_next_right,
on_error=on_error,
on_completed=on_completed_right)
d2 = self.right.unsafe_subscribe(right_observer, scheduler,
subscribe_scheduler)
return CompositeDisposable(d1, d2)
def __init__(self, value, initial):
self.lock = config["concurrency"].RLock()
self.value = value
self.counter = initial
self.promise = Ack()
def on_next(self, v):
self.received.append(v)
self.ack = Ack()
self.inner_obs = TestObserver()
self.inner_selector(v).subscribe(self.inner_obs, self.scheduler, CurrentThreadScheduler())
return self.ack
def on_next_left(left_val):
# left has been requested because of initial state,
# or because right is higher than left
left_elem[0] = left_val
left_ack[0] = Ack()
publish_subject[0] = PublishSubject()
# send next inner observable; subscribe needs to happen immediately
outer_ack[0] = left_observer[0].on_next(
(left_val, publish_subject[0])) # todo: make this private
with lock:
has_left_elem[0] = True
if has_right_elem[0]:
has_right = True
else:
# race condition: left element is receieved first
has_right = False
if has_right:
right_val = right_elem[0]
if left_is_lower(left_val, right_val):
# right is higher than left
# send (empty) inner observable and request new left; don't discard right element
# inner observable is empty, because left has just been received
# discard left element
has_left_elem[0] = False
left_elem[0] = None
# complete (empty) inner observable
publish_subject[0].on_completed()
# continue next left element after outer acknowledgment
return outer_ack[0]
if left_is_higher(left_val, right_val):
# right is lower than left, discard right and request new right
# this is possible in initial phase or if is_lower and is_higher are not tight
assert right_ack[0] is not None, 'missing acknowledgment'
with lock:
# avoids completing observer twice
# discard right element
has_right_elem[0] = False
right_elem[0] = None
if has_completed[0]:
complete_observer = True
else:
complete_observer = False
if complete_observer:
left_observer[0].on_completed()
right_observer[0].on_completed()
return Stop()
ack = right_observer[0].on_next((False, right_val))
# request new right
ack.connect_ack(next_ack=right_ack[0])
else:
# left is equal to right, send right element, request new right
with lock:
# avoids completing observer twice
# discard right element
has_right_elem[0] = False
right_elem[0] = None
if has_completed[0]:
complete_observer = True
else:
complete_observer = False
if complete_observer:
left_observer[0].on_completed()
right_observer[0].on_completed()
return Stop()
# send right element
ack = publish_subject[0].on_next(right_val)
ack2 = right_observer[0].on_next((True, right_val))
# request new right element
ack.connect_ack_2(ack2=ack2, next_ack=right_ack[0])
return_ack = left_ack[0].merge_ack(outer_ack[0])
# return left_ack[0]
return return_ack
def on_next_right(right_val):
right_elem[0] = right_val
right_ack[0] = Ack()
with lock:
has_right_elem[0] = True
if has_left_elem[0]:
has_left = True
else:
has_left = False
if has_left:
left_val = left_elem[0]
# print('left={}, right={}'.format(left_val, right_val))
if is_higher(left_val, right_val):
# right is higher than left
# complete inner observable, discard left and request new left; save right
with lock:
# avoids completing observer twice
# discard left element
has_left_elem[0] = False
left_elem[0] = None
if has_completed[0]:
complete_observer = True
else:
complete_observer = False
if complete_observer:
left_observer[0].on_completed()
right_observer[0].on_completed()
return Stop()
# complete inner observable
publish_subject[0].on_completed()
left_ack[0].on_next(continue_ack)
left_ack[0].on_completed()
return right_ack[0]
if is_lower(left_val, right_val):
# right is lower than left, discard right and request new right
# this is possible in initial phase or if is_lower and is_higher are not tight
ack = right_observer[0].on_next((False, right_val))
# discard right element
has_right_elem[0] = False
right_elem[0] = None
return ack
else:
# left is equal to right, send right element, request new right
# discard right element
has_right_elem[0] = False
right_elem[0] = None
# send right element
ack = publish_subject[0].on_next(right_val)
ack2 = right_observer[0].on_next((True, right_val))
return ack.merge_ack(ack2)
else:
# no left element has been yet received; only possible in initial phase
return right_ack[0]
def on_next_left(left):
# left has been requested because of initial state,
# or because right is higher than left
left_elem[0] = left
left_ack[0] = Ack()
with lock:
has_left_elem[0] = True
if has_right_elem[0]:
has_right = True
else:
# race condition: left element is receieved first
has_right = False
if has_right:
right = right_elem[0]
if left_is_lower(left, right):
# right is higher than left
# request new left; don't discard right element
# discard left element
has_left_elem[0] = False
left_elem[0] = None
return continue_ack
if left_is_higher(left, right):
# right is lower than left, discard right and request new right
# this is possible in initial phase or if is_lower and is_higher are not tight
assert right_ack[0] is not None, 'missing acknowledgment'
with lock:
# avoids completing observer twice
# discard right element
has_right_elem[0] = False
right_elem[0] = None
if has_completed[0]:
complete_observer = True
else:
complete_observer = False
if complete_observer:
# left_observer.on_completed()
observer.on_completed()
return Stop()
right_ack[0].on_next(continue_ack)
right_ack[0].on_completed()
else:
# left is equal to right, send right element, request new right
with lock:
# avoids completing observer twice
# discard right element
has_right_elem[0] = False
right_elem[0] = None
if has_completed[0]:
complete_observer = True
else:
complete_observer = False
if complete_observer:
# left_observer.on_completed()
observer.on_completed()
return Stop()
# send right element
ack = observer.on_next(self.selector(left, right))
# request new right element
ack.connect_ack(right_ack[0])
# # request new left element
# return ack
return left_ack[0]
def on_next_right(right):
ack = Ack()
upper_ack = None
has_inner_left_elem = False
request_left_right = False
request_right = False
with self.lock:
if 0 < inner_left_completed[0]:
inner_left_completed[0] -= 1
request_right = True
upper_ack = Continue()
# new_state = self.WaitForLeftOrRight()
new_state = state[0]
elif isinstance(state[0], self.WaitForLeftOrRight):
new_state = self.WaitForLeft(right_elem=right,
right_ack=ack)
elif isinstance(state[0], self.WaitForRightOrInner):
state_: FlatZipObservable.WaitForRightOrInner = state[0]
if inner_left_completed[0] == 0:
new_state = self.Active(left_ack=state_.left_ack,
right_elem=right,
right_ack=ack,
upper_ack=Continue())
else:
inner_left_completed[0] -= 1
new_state = self.WaitForLeftOrRight()
elif isinstance(state[0], self.WaitForRight):
state_: FlatZipObservable.WaitForRight = state[0]
has_inner_left_elem = True
left_elem = state_.left_elem
left_ack = state_.left_ack
inner_left_elem = state_.inner_left_elem
inner_left_ack = state_.inner_left_ack
new_state = state[0]
elif isinstance(state[0], source.Completed):
return stop_ack
else:
raise NotImplementedError
state[0] = new_state
if has_inner_left_elem:
zipped_elem = self.selector(left_elem, right, inner_left_elem)
upper_ack = observer.on_next(zipped_elem)
if isinstance(upper_ack, Stop):
with self.lock:
state[0] = self.Completed
return upper_ack
request_inner_elem = False
with self.lock:
if 0 < inner_left_completed[0]:
# inner left completed, request new left and right
new_state = self.WaitForLeftOrRight()
request_left_right = True
else:
# state is the same, change state to active
new_state = self.Active(left_ack=left_ack,
right_elem=right,
right_ack=ack,
upper_ack=upper_ack)
request_inner_elem = True
state[0] = new_state
if request_inner_elem:
if isinstance(upper_ack, Continue) or isinstance(
upper_ack, Stop):
inner_left_ack.on_next(upper_ack)
inner_left_ack.on_completed()
else:
upper_ack.observe_on(scheduler).subscribe(
inner_left_ack)
if request_left_right:
if isinstance(upper_ack, Continue):
left_ack.on_next(upper_ack)
left_ack.on_completed()
else:
upper_ack.observe_on(scheduler).subscribe(left_ack)
if request_left_right or request_right:
if isinstance(upper_ack, Continue):
ack.on_next(upper_ack)
ack.on_completed()
else:
upper_ack.observe_on(scheduler).subscribe(ack)
return ack
def on_next(self, v):
self.received.append(v)
self.ack = Ack()
return self.ack
def connect(self):
with self.lock:
if not self.is_connected and not self.is_connected_started:
self.is_connected_started = True
buffer_was_drained = Ack()
def on_next(v):
if isinstance(v, Continue):
self.root_ack.on_next(Continue())
self.root_ack.on_completed()
source.is_connected = True
source.queue = None
# source.connected_ack = None
# todo: fill in
elif isinstance(v, Stop):
raise NotImplementedError
else:
raise NotImplementedError
buffer_was_drained.subscribe(on_next=on_next)
source = self
class CustomObserver(Observer):
def __init__(self):
self.ack = None
def on_next(self, v):
ack = source.underlying.on_next(v)
self.ack = ack
def on_next(v):
if isinstance(v, Stop):
buffer_was_drained.on_next(v)
buffer_was_drained.on_completed()
ack.subscribe(on_next=on_next)
return ack
def on_error(self, err):
raise NotImplementedError
def on_completed(self):
if not source.scheduled_done:
if self.ack is None:
buffer_was_drained.on_next(Continue())
buffer_was_drained.on_completed()
else:
def on_next(v):
if isinstance(v, Continue):
buffer_was_drained.on_next(Continue())
buffer_was_drained.on_completed()
self.ack.subscribe(on_next)
elif source.schedule_error is not None:
raise NotImplementedError
else:
source.underlying.on_completed()
class EmptyObject:
pass
self.queue.put(EmptyObject)
disposable = IteratorAsObservable(iter(self.queue.get, EmptyObject)) \
.subscribe(CustomObserver(), self.scheduler, CurrentThreadScheduler())
self.connected_ref = buffer_was_drained, disposable
return self.connected_ref