def if_then(condition: Callable[[], bool],
then_source: ObservableBase,
else_source: ObservableBase = None) -> ObservableBase:
"""Determines whether an observable collection contains values.
Example:
1 - res = rx.Observable.if(condition, obs1)
2 - res = rx.Observable.if(condition, obs1, obs2)
Keyword parameters:
condition -- The condition which determines if the then_source or
else_source will be run.
then_source -- The observable sequence or Promise that
will be run if the condition function returns true.
else_source -- [Optional] The observable sequence or
Promise that will be run if the condition function returns
False. If this is not provided, it defaults to
rx.Observable.empty
Returns an observable sequence which is either the
then_source or else_source.
"""
else_source = else_source or Observable.empty()
then_source = Observable.from_future(then_source) if is_future(
then_source) else then_source
else_source = Observable.from_future(else_source) if is_future(
else_source) else else_source
def factory(_: abc.Scheduler):
return then_source if condition() else else_source
return Observable.defer(factory)
def on_next(inner_source):
d = SingleAssignmentDisposable()
with self.lock:
latest[0] += 1
_id = latest[0]
has_latest[0] = True
inner_subscription.disposable = d
# Check if Future or Observable
inner_source = Observable.from_future(inner_source)
def on_next(x):
if latest[0] == _id:
observer.on_next(x)
def on_error(e):
if latest[0] == _id:
observer.on_error(e)
def on_completed():
if latest[0] == _id:
has_latest[0] = False
if is_stopped[0]:
observer.on_completed()
d.disposable = inner_source.subscribe(on_next, on_error,
on_completed)
def on_next(inner_source):
d = SingleAssignmentDisposable()
with self.lock:
latest[0] += 1
_id = latest[0]
has_latest[0] = True
inner_subscription.disposable = d
# Check if Future or Observable
inner_source = Observable.from_future(inner_source)
def on_next(x):
if latest[0] == _id:
observer.on_next(x)
def on_error(e):
if latest[0] == _id:
observer.on_error(e)
def on_completed():
if latest[0] == _id:
has_latest[0] = False
if is_stopped[0]:
observer.on_completed()
d.disposable = inner_source.subscribe(on_next, on_error, on_completed)
def projection(x, i):
mapper_result = mapper(x) if mapper else mapper_indexed(x, i)
if isinstance(mapper_result, collections.Iterable):
result = Observable.from_(mapper_result)
else:
result = Observable.from_future(mapper_result) if is_future(mapper_result) else mapper_result
return result
def take_until(source: ObservableBase,
other: ObservableBase) -> ObservableBase:
"""Returns the values from the source observable sequence until the
other observable sequence produces a value.
Keyword arguments:
other -- Observable sequence that terminates propagation of elements
of the source sequence.
Returns an observable sequence containing the elements of the source
sequence up to the point the other sequence interrupted further
propagation.
"""
other = Observable.from_future(other) if is_future(other) else other
def subscribe(observer, scheduler=None):
def on_completed(_):
observer.on_completed()
return CompositeDisposable(
source.subscribe(observer),
other.subscribe_(on_completed, observer.on_error, noop, scheduler))
return AnonymousObservable(subscribe)
def take_until(self, other):
"""Returns the values from the source observable sequence until the
other observable sequence produces a value.
Keyword arguments:
other -- Observable sequence that terminates propagation of elements of
the source sequence.
Returns an observable sequence containing the elements of the source
sequence up to the point the other sequence interrupted further
propagation.
"""
source = self
other = Observable.from_future(other)
def subscribe(observer):
def on_completed(x):
observer.on_completed()
return CompositeDisposable(
source.subscribe(observer),
other.subscribe(on_completed, observer.on_error, noop))
return AnonymousObservable(subscribe)
def take_until(self, other):
"""Returns the values from the source observable sequence until the
other observable sequence produces a value.
Keyword arguments:
other -- Observable sequence that terminates propagation of elements of
the source sequence.
Returns an observable sequence containing the elements of the source
sequence up to the point the other sequence interrupted further
propagation.
"""
source = self
other = Observable.from_future(other)
def subscribe(observer):
def on_completed(x):
observer.on_completed()
return CompositeDisposable(
source.subscribe(observer),
other.subscribe(on_completed, observer.on_error, noop)
)
return AnonymousObservable(subscribe)
def subscribe(observer, scheduler=None):
try:
result = observable_factory(scheduler)
except Exception as ex:
return Observable.throw(ex).subscribe(observer)
result = Observable.from_future(result) if is_future(result) else result
return result.subscribe(observer, scheduler)
def subscribe(observer):
try:
result = observable_factory()
except Exception as ex:
return Observable.throw_exception(ex).subscribe(observer)
result = Observable.from_future(result)
return result.subscribe(observer)
def subscribe(observer):
try:
result = observable_factory()
except Exception as ex:
return Observable.throw_exception(ex).subscribe(observer)
result = Observable.from_future(result)
return result.subscribe(observer)
def projection(x: Any, idx: int) -> Any:
mapper_result = mapper(x)
if isinstance(mapper_result, collections.abc.Iterable):
result = Observable.from_(mapper_result)
else:
result = Observable.from_future(
mapper_result) if is_future(
mapper_result) else mapper_result
return result.map(lambda y: result_mapper(x, y))
def factory(_) -> ObservableBase:
try:
result = sources[mapper()]
except KeyError:
result = default_source
result = Observable.from_future(result) if is_future(
result) else result
return result
def func(i):
source = sources[i]
sad = SingleAssignmentDisposable()
source = Observable.from_future(source)
def on_next(x):
queues[i].append(x)
next(i)
sad.disposable = source.subscribe(on_next, observer.on_error, lambda: done(i))
subscriptions[i] = sad
def projection(x: Any, idx: int) -> Any:
mapper_result = mapper(x) if mapper else mapper_indexed(x, idx)
if isinstance(mapper_result, collections.Iterable):
result = Observable.from_(mapper_result)
else:
result = Observable.from_future(mapper_result) if is_future(mapper_result) else mapper_result
if result_mapper:
return result.map(lambda y: result_mapper(x, y))
else:
return result.map(mapper_indexed=lambda y, i: result_mapper_indexed(x, y, i))
def on_error(exception):
try:
result = handler(exception)
except Exception as ex:
observer.on_error(ex)
return
result = Observable.from_future(result)
d = SingleAssignmentDisposable()
subscription.disposable = d
d.disposable = result.subscribe(observer)
def on_error(exception):
try:
result = handler(exception)
except Exception as ex:
observer.on_error(ex)
return
result = Observable.from_future(result)
d = SingleAssignmentDisposable()
subscription.disposable = d
d.disposable = result.subscribe(observer)
def on_error(exception):
try:
result = handler(exception)
except Exception as ex: # By design. pylint: disable=W0703
observer.on_error(ex)
return
result = Observable.from_future(result) if is_future(result) else result
d = SingleAssignmentDisposable()
subscription.disposable = d
d.disposable = result.subscribe(observer, scheduler)
def func(i): # subscribe to the ith input
source = sources[i]
sad = SingleAssignmentDisposable()
source = Observable.from_future(source)
def on_next(x):
queues[i].append(x)
next()
sad.disposable = source.subscribe(on_next, observer.on_error,
lambda: done(i))
subscriptions[i] = sad
def func(i):
source = sources[i]
sad = SingleAssignmentDisposable()
source = Observable.from_future(source) if is_future(
source) else source
def on_next(x):
queues[i].append(x)
next(i)
sad.disposable = source.subscribe_(on_next, observer.on_error,
lambda: done(i), scheduler)
subscriptions[i] = sad
def on_next(inner_source):
inner_subscription = SingleAssignmentDisposable()
group.add(inner_subscription)
inner_source = Observable.from_future(inner_source) if is_future(inner_source) else inner_source
def on_completed():
group.remove(inner_subscription)
if is_stopped[0] and len(group) == 1:
observer.on_completed()
disposable = inner_source.subscribe_(observer.on_next, observer.on_error, on_completed, scheduler)
inner_subscription.disposable = disposable
def while_do(condition, source: ObservableBase) -> ObservableBase:
"""Repeats source as long as condition holds emulating a while loop.
Keyword arguments:
condition -- The condition which determines if the source will be
repeated.
source -- The observable sequence that will be run if the condition
function returns true.
Returns an observable sequence which is repeated as long as the
condition holds.
"""
source = Observable.from_future(source) if is_future(source) else source
from .concat import concat
return concat(Iterable.while_do(condition, source))
def on_next(inner_source):
inner_subscription = SingleAssignmentDisposable()
group.add(inner_subscription)
inner_source = Observable.from_future(inner_source)
def on_next(x):
observer.on_next(x)
def on_completed():
group.remove(inner_subscription)
if is_stopped[0] and len(group) == 1:
observer.on_completed()
disposable = inner_source.subscribe(on_next, observer.on_error, on_completed)
inner_subscription.disposable = disposable
def while_do(cls, condition, source):
"""Repeats source as long as condition holds emulating a while loop.
Keyword arguments:
:param types.FunctionType condition: The condition which determines if the
source will be repeated.
:param Observable source: The observable sequence that will be run if the
condition function returns true.
:returns: An observable sequence which is repeated as long as the condition
holds.
:rtype: Observable
"""
source = Observable.from_future(source)
return Observable.concat(Enumerable.while_do(condition, source))
def on_next(inner_source):
if not has_current[0]:
has_current[0] = True
inner_source = Observable.from_future(inner_source)
inner_subscription = SingleAssignmentDisposable()
g.add(inner_subscription)
def on_completed_inner():
g.remove(inner_subscription)
has_current[0] = False
if is_stopped[0] and len(g) == 1:
observer.on_completed()
inner_subscription.disposable = inner_source.subscribe(
observer.on_next, observer.on_error, on_completed_inner)
def action(this, state=None):
try:
source = next(sources)
except StopIteration:
observer.on_completed()
return
# Allow source to be a factory method taking an error
source = source(state) if callable(source) else source
current = Observable.from_future(source)
d = SingleAssignmentDisposable()
subscription.disposable = d
d.disposable = current.subscribe(
observer.on_next,
lambda ex: this(ex),
this)
def while_do(cls, condition, source):
"""Repeats source as long as condition holds emulating a while loop.
Arguments:
condition (types.FunctionType): The condition which determines if the
source will be repeated.
source (Observable): The observable sequence that will be run if the
condition function returns True.
Returns:
(Observable): An observable sequence which is repeated as long as the
condition holds.
"""
source = Observable.from_future(source)
return Observable.concat(Enumerable.while_do(condition, source))
def skip_until(self, other):
"""Returns the values from the source observable sequence only after
the other observable sequence produces a value.
other -- The observable sequence that triggers propagation of elements
of the source sequence.
Returns an observable sequence containing the elements of the source
sequence starting from the point the other sequence triggered
propagation.
"""
source = self
other = Observable.from_future(other)
def subscribe(observer):
is_open = [False]
def on_next(left):
if is_open[0]:
observer.on_next(left)
def on_completed():
if is_open[0]:
observer.on_completed()
subs = source.subscribe(on_next, observer.on_error, on_completed)
disposables = CompositeDisposable(subs)
right_subscription = SingleAssignmentDisposable()
disposables.add(right_subscription)
def on_next2(x):
is_open[0] = True
right_subscription.dispose()
def on_completed2():
right_subscription.dispose()
right_subscription.disposable = other.subscribe(
on_next2, observer.on_error, on_completed2)
return disposables
return AnonymousObservable(subscribe)
def action(scheduler, state=None):
try:
source = next(sources)
except StopIteration:
observer.on_completed()
return
# Allow source to be a factory method taking an error
source = source(state) if callable(source) else source
current = Observable.from_future(source)
d = SingleAssignmentDisposable()
subscription.disposable = d
def on_resume(state=None):
scheduler.schedule(action, state)
d.disposable = current.subscribe(observer.on_next, on_resume, on_resume)
def start_async(function_async) -> ObservableBase:
"""Invokes the asynchronous function, surfacing the result through
an observable sequence.
Keyword arguments:
function_async -- Asynchronous function which returns a Future to
run.
Returns an observable sequence exposing the function's result value,
or an exception.
"""
try:
future = function_async()
except Exception as ex:
return Observable.throw(ex)
return Observable.from_future(future)
def start_async(cls, function_async):
"""Invokes the asynchronous function, surfacing the result through an
observable sequence.
Keyword arguments:
:param types.FunctionType function_async: Asynchronous function which
returns a Future to run.
:returns: An observable sequence exposing the function's result value, or an
exception.
:rtype: Observable
"""
try:
future = function_async()
except Exception as ex:
return Observable.throw(ex)
return Observable.from_future(future)
def skip_until(self, other):
"""Returns the values from the source observable sequence only after
the other observable sequence produces a value.
other -- The observable sequence that triggers propagation of elements
of the source sequence.
Returns an observable sequence containing the elements of the source
sequence starting from the point the other sequence triggered
propagation.
"""
source = self
other = Observable.from_future(other)
def subscribe(observer):
is_open = [False]
def on_next(left):
if is_open[0]:
observer.on_next(left)
def on_completed():
if is_open[0]:
observer.on_completed()
subs = source.subscribe(on_next, observer.on_error, on_completed)
disposables = CompositeDisposable(subs)
right_subscription = SingleAssignmentDisposable()
disposables.add(right_subscription)
def on_next2(x):
is_open[0] = True
right_subscription.dispose()
def on_completed2():
right_subscription.dispose()
right_subscription.disposable = other.subscribe(on_next2, observer.on_error, on_completed2)
return disposables
return AnonymousObservable(subscribe)
def on_next(inner_source):
if not has_current[0]:
has_current[0] = True
inner_source = Observable.from_future(inner_source)
inner_subscription = SingleAssignmentDisposable()
g.add(inner_subscription)
def on_completed_inner():
g.remove(inner_subscription)
has_current[0] = False
if is_stopped[0] and len(g) == 1:
observer.on_completed()
inner_subscription.disposable = inner_source.subscribe(
observer.on_next,
observer.on_error,
on_completed_inner
)
def amb(self, right_source):
"""Propagates the observable sequence that reacts first.
Arguments:
right_source (Observable): Second observable sequence.
Returns:
Observable: an observable sequence that surfaces either of the given
sequences, whichever reacted first.
"""
left_source = self
right_source = Observable.from_future(right_source)
def subscribe(observer):
choice = [None]
left_choice = 'L'
right_choice = 'R',
left_subscription = SingleAssignmentDisposable()
right_subscription = SingleAssignmentDisposable()
def choice_left():
if not choice[0]:
choice[0] = left_choice
right_subscription.dispose()
def choice_right():
if not choice[0]:
choice[0] = right_choice
left_subscription.dispose()
def on_next_left(value):
with self.lock:
choice_left()
if choice[0] == left_choice:
observer.on_next(value)
def on_error_left(err):
with self.lock:
choice_left()
if choice[0] == left_choice:
observer.on_error(err)
def on_completed_left():
with self.lock:
choice_left()
if choice[0] == left_choice:
observer.on_completed()
ld = left_source.subscribe(on_next_left, on_error_left,
on_completed_left)
left_subscription.disposable = ld
def on_next_right(value):
with self.lock:
choice_right()
if choice[0] == right_choice:
observer.on_next(value)
def on_error_right(err):
with self.lock:
choice_right()
if choice[0] == right_choice:
observer.on_error(err)
def on_completed_right():
with self.lock:
choice_right()
if choice[0] == right_choice:
observer.on_completed()
rd = right_source.subscribe(on_next_right, on_error_right,
on_completed_right)
right_subscription.disposable = rd
return CompositeDisposable(left_subscription, right_subscription)
return AnonymousObservable(subscribe)
def timeout(self, duetime, other=None, scheduler=None):
"""Returns the source observable sequence or the other observable
sequence if duetime elapses.
Example::
from datetime import datetime
# As a date
res = source.timeout(datetime.now())
# 5 seconds (5000 milliseconds)
res = source.timeout(5000); # 5 seconds
# As a date and timeout observable
res = source.timeout(datetime.now(),
rx.Observable.return_value(42))
# 5 seconds and timeout observable
res = source.timeout(5000, rx.Observable.return_value(42))
# As a date and timeout observable
res = source.timeout(datetime.now(),
rx.Observable.return_value(42),
rx.Scheduler.timeout)
# 5 seconds and timeout observable
res = source.timeout(5000,
rx.Observable.return_value(42),
rx.Scheduler.timeout)
Keyword arguments:
duetime (int, datetime.datetime): Absolute (specified as a
:class:`datetime.datetime` object) or relative time (specified as an
integer denoting milliseconds) when a timeout occurs.
other (Observable): Sequence to return in case of a timeout. If not
specified, a timeout error throwing sequence will be used.
scheduler (Scheduler): Scheduler to run the timeout timers on. If not
specified, the timeout scheduler is used.
Returns:
(Observable): The source sequence switching to the other sequence in case
of a timeout.
"""
scheduler_method = None
source = self
other = other or Observable.throw_exception(Exception("Timeout"))
other = Observable.from_future(other)
scheduler = scheduler or timeout_scheduler
if isinstance(duetime, datetime):
scheduler_method = scheduler.schedule_absolute
else:
scheduler_method = scheduler.schedule_relative
def subscribe(observer):
switched = [False]
_id = [0]
original = SingleAssignmentDisposable()
subscription = SerialDisposable()
timer = SerialDisposable()
subscription.disposable = original
def create_timer():
my_id = _id[0]
def action(scheduler, state=None):
switched[0] = (_id[0] == my_id)
timer_wins = switched[0]
if timer_wins:
subscription.disposable = other.subscribe(observer)
timer.disposable = scheduler_method(duetime, action)
create_timer()
def on_next(x):
on_next_wins = not switched[0]
if on_next_wins:
_id[0] += 1
observer.on_next(x)
create_timer()
def on_error(e):
on_error_wins = not switched[0]
if on_error_wins:
_id[0] += 1
observer.on_error(e)
def on_completed():
on_completed_wins = not switched[0]
if on_completed_wins:
_id[0] += 1
observer.on_completed()
original.disposable = source.subscribe(on_next, on_error, on_completed)
return CompositeDisposable(subscription, timer)
return AnonymousObservable(subscribe)
def amb(self, right_source):
"""Propagates the observable sequence that reacts first.
right_source Second observable sequence.
returns an observable sequence that surfaces either of the given
sequences, whichever reacted first.
"""
left_source = self
right_source = Observable.from_future(right_source)
def subscribe(observer):
choice = [None]
left_choice = 'L'
right_choice = 'R',
left_subscription = SingleAssignmentDisposable()
right_subscription = SingleAssignmentDisposable()
def choice_left():
if not choice[0]:
choice[0] = left_choice
right_subscription.dispose()
def choice_right():
if not choice[0]:
choice[0] = right_choice
left_subscription.dispose()
def on_next_left(value):
with self.lock:
choice_left()
if choice[0] == left_choice:
observer.on_next(value)
def on_error_left(err):
with self.lock:
choice_left()
if choice[0] == left_choice:
observer.on_error(err)
def on_completed_left():
with self.lock:
choice_left()
if choice[0] == left_choice:
observer.on_completed()
ld = left_source.subscribe(on_next_left, on_error_left,
on_completed_left)
left_subscription.disposable = ld
def on_next_right(value):
with self.lock:
choice_right()
if choice[0] == right_choice:
observer.on_next(value)
def on_error_right(err):
with self.lock:
choice_right()
if choice[0] == right_choice:
observer.on_error(err)
def on_completed_right():
with self.lock:
choice_right()
if choice[0] == right_choice:
observer.on_completed()
rd = right_source.subscribe(on_next_right, on_error_right,
on_completed_right)
right_subscription.disposable = rd
return CompositeDisposable(left_subscription, right_subscription)
return AnonymousObservable(subscribe)
def _amb(left_source, right_source):
right_source = Observable.from_future(right_source) if is_future(
right_source) else right_source
def subscribe(observer, scheduler=None):
choice = [None]
left_choice = 'L'
right_choice = 'R'
left_subscription = SingleAssignmentDisposable()
right_subscription = SingleAssignmentDisposable()
def choice_left():
if not choice[0]:
choice[0] = left_choice
right_subscription.dispose()
def choice_right():
if not choice[0]:
choice[0] = right_choice
left_subscription.dispose()
def on_next_left(value):
with left_source.lock:
choice_left()
if choice[0] == left_choice:
observer.on_next(value)
def on_error_left(err):
with left_source.lock:
choice_left()
if choice[0] == left_choice:
observer.on_error(err)
def on_completed_left():
with left_source.lock:
choice_left()
if choice[0] == left_choice:
observer.on_completed()
lelf_d = left_source.subscribe_(on_next_left, on_error_left,
on_completed_left, scheduler)
left_subscription.disposable = lelf_d
def send_right(value):
with left_source.lock:
choice_right()
if choice[0] == right_choice:
observer.on_next(value)
def on_error_right(err):
with left_source.lock:
choice_right()
if choice[0] == right_choice:
observer.on_error(err)
def on_completed_right():
with left_source.lock:
choice_right()
if choice[0] == right_choice:
observer.on_completed()
right_d = right_source.subscribe_(send_right, on_error_right,
on_completed_right, scheduler)
right_subscription.disposable = right_d
return CompositeDisposable(left_subscription, right_subscription)
return AnonymousObservable(subscribe)
def timeout(source: ObservableBase,
duetime: Union[int, datetime],
other: ObservableBase = None) -> ObservableBase:
"""Returns the source observable sequence or the other observable
sequence if duetime elapses.
1 - res = source.timeout(5000); # 5 seconds
# As a date and timeout observable
2 - res = source.timeout(datetime(), Observable.return_value(42))
# 5 seconds and timeout observable
3 - res = source.timeout(5000, Observable.return_value(42))
# As a date and timeout observable
Keyword arguments:
duetime -- Absolute (specified as a datetime object) or relative
time (specified as an integer denoting milliseconds) when a
timeout occurs.
other -- Sequence to return in case of a timeout. If not
specified, a timeout error throwing sequence will be used.
Returns the source sequence switching to the other sequence in case
of a timeout.
"""
other = other or Observable.throw(Exception("Timeout"))
other = Observable.from_future(other) if is_future(other) else other
def subscribe(observer, scheduler=None):
scheduler = scheduler or timeout_scheduler
if isinstance(duetime, datetime):
scheduler_method = scheduler.schedule_absolute
else:
scheduler_method = scheduler.schedule_relative
switched = [False]
_id = [0]
original = SingleAssignmentDisposable()
subscription = SerialDisposable()
timer = SerialDisposable()
subscription.disposable = original
def create_timer():
my_id = _id[0]
def action(scheduler, state=None):
switched[0] = (_id[0] == my_id)
timer_wins = switched[0]
if timer_wins:
subscription.disposable = other.subscribe(
observer, scheduler)
timer.disposable = scheduler_method(duetime, action)
create_timer()
def on_next(value):
send_wins = not switched[0]
if send_wins:
_id[0] += 1
observer.on_next(value)
create_timer()
def on_error(error):
on_error_wins = not switched[0]
if on_error_wins:
_id[0] += 1
observer.on_error(error)
def on_completed():
on_completed_wins = not switched[0]
if on_completed_wins:
_id[0] += 1
observer.on_completed()
original.disposable = source.subscribe_(on_next, on_error,
on_completed, scheduler)
return CompositeDisposable(subscription, timer)
return AnonymousObservable(subscribe)
def _amb(left_source, right_source):
"""Propagates the observable sequence that reacts first.
right_source Second observable sequence.
returns an observable sequence that surfaces either of the given
sequences, whichever reacted first.
"""
right_source = Observable.from_future(right_source) if is_future(right_source) else right_source
def subscribe(observer, scheduler=None):
choice = [None]
left_choice = 'L'
right_choice = 'R',
left_subscription = SingleAssignmentDisposable()
right_subscription = SingleAssignmentDisposable()
def choice_left():
if not choice[0]:
choice[0] = left_choice
right_subscription.dispose()
def choice_right():
if not choice[0]:
choice[0] = right_choice
left_subscription.dispose()
def on_next_left(value):
with left_source.lock:
choice_left()
if choice[0] == left_choice:
observer.on_next(value)
def on_error_left(err):
with left_source.lock:
choice_left()
if choice[0] == left_choice:
observer.on_error(err)
def on_completed_left():
with left_source.lock:
choice_left()
if choice[0] == left_choice:
observer.on_completed()
lelf_d = left_source.subscribe_(on_next_left, on_error_left, on_completed_left, scheduler)
left_subscription.disposable = lelf_d
def send_right(value):
with left_source.lock:
choice_right()
if choice[0] == right_choice:
observer.on_next(value)
def on_error_right(err):
with left_source.lock:
choice_right()
if choice[0] == right_choice:
observer.on_error(err)
def on_completed_right():
with left_source.lock:
choice_right()
if choice[0] == right_choice:
observer.on_completed()
right_d = right_source.subscribe_(send_right, on_error_right, on_completed_right, scheduler)
right_subscription.disposable = right_d
return CompositeDisposable(left_subscription, right_subscription)
return AnonymousObservable(subscribe)
def timeout(self, duetime, other=None, scheduler=None):
"""Returns the source observable sequence or the other observable
sequence if duetime elapses.
1 - res = source.timeout(new Date()); # As a date
2 - res = source.timeout(5000); # 5 seconds
# As a date and timeout observable
3 - res = source.timeout(datetime(), rx.Observable.return_value(42))
# 5 seconds and timeout observable
4 - res = source.timeout(5000, rx.Observable.return_value(42))
# As a date and timeout observable
5 - res = source.timeout(datetime(), rx.Observable.return_value(42),
rx.Scheduler.timeout)
# 5 seconds and timeout observable
6 - res = source.timeout(5000, rx.Observable.return_value(42),
rx.Scheduler.timeout)
Keyword arguments:
:param datetime|int duetime: Absolute (specified as a datetime object) or
relative time (specified as an integer denoting milliseconds) when a
timeout occurs.
:param Observable other: Sequence to return in case of a timeout. If not
specified, a timeout error throwing sequence will be used.
:param Scheduler scheduler: Scheduler to run the timeout timers on. If not
specified, the timeout scheduler is used.
:returns: The source sequence switching to the other sequence in case of
a timeout.
:rtype: Observable
"""
scheduler_method = None
source = self
other = other or Observable.throw_exception(Exception("Timeout"))
other = Observable.from_future(other)
scheduler = scheduler or timeout_scheduler
if isinstance(duetime, datetime):
scheduler_method = scheduler.schedule_absolute
else:
scheduler_method = scheduler.schedule_relative
def subscribe(observer):
switched = [False]
_id = [0]
original = SingleAssignmentDisposable()
subscription = SerialDisposable()
timer = SerialDisposable()
subscription.disposable = original
def create_timer():
my_id = _id[0]
def action(scheduler, state=None):
switched[0] = (_id[0] == my_id)
timer_wins = switched[0]
if timer_wins:
subscription.disposable = other.subscribe(observer)
timer.disposable = scheduler_method(duetime, action)
create_timer()
def on_next(x):
on_next_wins = not switched[0]
if on_next_wins:
_id[0] += 1
observer.on_next(x)
create_timer()
def on_error(e):
on_error_wins = not switched[0]
if on_error_wins:
_id[0] += 1
observer.on_error(e)
def on_completed():
on_completed_wins = not switched[0]
if on_completed_wins:
_id[0] += 1
observer.on_completed()
original.disposable = source.subscribe(on_next, on_error, on_completed)
return CompositeDisposable(subscription, timer)
return AnonymousObservable(subscribe)
