def test_connectable_observable_creation(self):
y = [0]
s2 = Subject()
co2 = ConnectableObservable(rx.return_value(1), s2)
def on_next(x):
y[0] = x
co2.subscribe(on_next=on_next)
self.assertNotEqual(1, y[0])
co2.connect()
self.assertEqual(1, y[0])
def test_connectable_observable_not_connected(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_next(210, 1), on_next(220, 2),
on_next(230, 3), on_next(240, 4),
on_completed(250))
subject = MySubject()
conn = ConnectableObservable(xs, subject)
res = scheduler.start(lambda: conn)
assert res.messages == []
def multicast(
source: Observable) -> Union[Observable, ConnectableObservable]:
if subject_factory:
def subscribe(observer, scheduler=None):
connectable = source.pipe(
_multicast(subject=subject_factory(scheduler)))
subscription = mapper(connectable).subscribe(
observer, scheduler=scheduler)
return CompositeDisposable(subscription,
connectable.connect(scheduler))
return Observable(subscribe)
return ConnectableObservable(source, subject)
def test_connectable_observable_forward_scheduler(self):
scheduler = TestScheduler()
subscribe_scheduler = 'unknown'
def subscribe(observer, scheduler=None):
nonlocal subscribe_scheduler
subscribe_scheduler = scheduler
xs = rx.create(subscribe)
subject = MySubject()
conn = ConnectableObservable(xs, subject)
conn.connect(scheduler)
assert subscribe_scheduler is scheduler
def multicast(
source: ObservableBase,
subject: Subject = None,
subject_factory: Callable[[], Subject] = None,
mapper: Mapper = None) -> Union[ObservableBase, ConnectableObservable]:
"""Multicasts the source sequence notifications through an
instantiated subject into all uses of the sequence within a mapper
function. Each subscription to the resulting sequence causes a
separate multicast invocation, exposing the sequence resulting from
the mapper function's invocation. For specializations with fixed
subject types, see Publish, PublishLast, and Replay.
Example:
1 - res = source.multicast(observable)
2 - res = source.multicast(subject_factory=lambda scheduler: Subject(),
mapper=lambda x: x)
Keyword arguments:
subject_factory -- Factory function to create an intermediate
subject through which the source sequence's elements will be
multicast to the mapper function.
subject -- Subject to push source elements into.
mapper -- [Optional] Optional mapper function which can use the
multicasted source sequence subject to the policies enforced
by the created subject. Specified only if subject_factory" is a
factory function.
Returns an observable sequence that contains the elements of a
sequence produced by multicasting the source sequence within a
mapper function.
"""
if subject_factory:
def subscribe(observer, scheduler=None):
connectable = source.multicast(subject=subject_factory(scheduler))
subscription = mapper(connectable).subscribe(observer, scheduler)
return CompositeDisposable(subscription,
connectable.connect(scheduler))
return AnonymousObservable(subscribe)
return ConnectableObservable(source, subject)
def test_ref_count_connects_on_first(self):
scheduler = TestScheduler()
xs = scheduler.create_hot_observable(on_next(210, 1), on_next(220, 2),
on_next(230, 3), on_next(240, 4),
on_completed(250))
subject = MySubject()
conn = ConnectableObservable(xs, subject)
def create():
return conn.ref_count()
res = scheduler.start(create)
assert res.messages == [
on_next(210, 1),
on_next(220, 2),
on_next(230, 3),
on_next(240, 4),
on_completed(250)
]
assert (subject.disposed)
def test_ref_count_notconnected(self):
disconnected = [False]
count = [0]
def factory(scheduler):
count[0] += 1
def create(obs):
def func():
disconnected[0] = True
return func
return Observable.create(create)
xs = Observable.defer(factory)
subject = MySubject()
conn = ConnectableObservable(xs, subject)
refd = conn.ref_count()
dis1 = refd.subscribe()
self.assertEqual(1, count[0])
self.assertEqual(1, subject.subscribe_count)
assert (not disconnected[0])
dis2 = refd.subscribe()
self.assertEqual(1, count[0])
self.assertEqual(2, subject.subscribe_count)
assert (not disconnected[0])
dis1.dispose()
assert (not disconnected[0])
dis2.dispose()
assert (disconnected[0])
disconnected[0] = False
dis3 = refd.subscribe()
self.assertEqual(2, count[0])
self.assertEqual(3, subject.subscribe_count)
assert (not disconnected[0])
dis3.dispose()
assert (disconnected[0])