class EnumeratingSink(Observer):
def __init__(self, onNext, done):
self.onNextAction = onNext
self.doneAction = done
self.index = 0
self.stopped = Atomic(False)
self.exception = None
def onNext(self, value):
if not self.stopped.value:
try:
self.onNextAction(value, self.index)
self.index += 1
except Exception as e:
self.onError(e)
def onError(self, exception):
if not self.stopped.exchange(True):
self.exception = exception
self.doneAction()
def onCompleted(self):
if not self.stopped.exchange(True):
self.doneAction()
class EnumeratingSink(Observer):
def __init__(self, onNext, done):
self.onNextAction = onNext
self.doneAction = done
self.index = 0
self.stopped = Atomic(False)
self.exception = None
def onNext(self, value):
if not self.stopped.value:
try:
self.onNextAction(value, self.index)
self.index += 1
except Exception as e:
self.onError(e)
def onError(self, exception):
if not self.stopped.exchange(True):
self.exception = exception
self.doneAction()
def onCompleted(self):
if not self.stopped.exchange(True):
self.doneAction()
def __init__(self, onNext, done):
self.onNextAction = onNext
self.doneAction = done
self.index = 0
self.stopped = Atomic(False)
self.exception = None
def __init__(self, scheduler, observer):
super(ScheduledObserver, self).__init__()
self.scheduler = scheduler
self.observer = observer
self.state = Atomic(ScheduledObserver.STOPPED, self.lock)
self.disposable = SerialDisposable()
self.failed = False
self.exception = None
self.completed = False
self.queue = Queue()
self.dispatcherJob = None
self.dispatcherEvent = Semaphore(0)
class Sink(Disposable):
"""Base class for implementation of query operators, providing
a lightweight sink that can be disposed to mute the outgoing observer."""
def __init__(self, observer, cancel):
super(Sink, self).__init__()
self.observer = observer
self.cancel = Atomic(cancel)
def dispose(self):
self.observer = NoopObserver.instance
cancel = self.cancel.exchange(None)
if cancel != None:
cancel.dispose()
class Forewarder(Observer):
def __init__(self, foreward):
self.foreward = foreward
def onNext(self, value):
self.foreward.observer.onNext(value)
def onError(self, exception):
self.foreward.observer.onError(exception)
self.foreward.dispose()
def onCompleted(self):
self.foreward.observer.onCompleted()
self.foreward.dispose()
def getForewarder(self):
return self.Forewarder(self)
def __init__(self, onNext, done):
self.onNextAction = onNext
self.doneAction = done
self.index = 0
self.stopped = Atomic(False)
self.exception = None
class Sink(Disposable):
"""Base class for implementation of query operators, providing
a lightweight sink that can be disposed to mute the outgoing observer."""
def __init__(self, observer, cancel):
super(Sink, self).__init__()
self.observer = observer
self.cancel = Atomic(cancel)
def dispose(self):
self.observer = NoopObserver.instance
cancel = self.cancel.exchange(None)
if cancel != None:
cancel.dispose()
class Forewarder(Observer):
def __init__(self, foreward):
self.foreward = foreward
def onNext(self, value):
self.foreward.observer.onNext(value)
def onError(self, exception):
self.foreward.observer.onError(exception)
self.foreward.dispose()
def onCompleted(self):
self.foreward.observer.onCompleted()
self.foreward.dispose()
def getForewarder(self):
return self.Forewarder(self)
class InnerDisposable(Disposable):
def __init__(self, parent):
self.parent = Atomic(parent)
def dispose(self):
parent = self.parent.exchange(None)
if parent != None:
parent.release()
class InnerDisposable(Disposable):
def __init__(self, parent):
self.parent = Atomic(parent)
def dispose(self):
parent = self.parent.exchange(None)
if parent != None:
parent.release()
class ObserverBase(Cancelable, Observer):
"""Abstract base class for implementations
of the IObserver interface.
This base class enforces the grammar of observers
where OnError and OnCompleted are terminal messages."""
def __init__(self):
super(ObserverBase, self).__init__()
self.isStopped = Atomic(False, self.lock)
def onNext(self, value):
with self.lock:
if self.isStopped.value:
return
self.onNextCore(value)
def onError(self, exception):
if not self.isStopped.exchange(True):
self.onErrorCore(exception)
def onCompleted(self):
if not self.isStopped.exchange(True):
self.onCompletedCore()
def dispose(self):
self.isStopped.value = True
def fail(self, exception):
if self.isStopped.exchange(True):
# isStopped was already true
return False
else:
self.onErrorCore(exception)
return True
def onNextCore(self, value):
raise NotImplementedError()
def onErrorCore(self, exception):
raise NotImplementedError()
def onCompletedCore(self):
raise NotImplementedError()
class ObserverBase(Cancelable, Observer):
"""Abstract base class for implementations
of the IObserver interface.
This base class enforces the grammar of observers
where OnError and OnCompleted are terminal messages."""
def __init__(self):
super(ObserverBase, self).__init__()
self.isStopped = Atomic(False, self.lock)
def onNext(self, value):
with self.lock:
if self.isStopped.value:
return
self.onNextCore(value)
def onError(self, exception):
if not self.isStopped.exchange(True):
self.onErrorCore(exception)
def onCompleted(self):
if not self.isStopped.exchange(True):
self.onCompletedCore()
def dispose(self):
self.isStopped.value = True
def fail(self, exception):
if self.isStopped.exchange(True):
# isStopped was already true
return False
else:
self.onErrorCore(exception)
return True
def onNextCore(self, value):
raise NotImplementedError()
def onErrorCore(self, exception):
raise NotImplementedError()
def onCompletedCore(self):
raise NotImplementedError()
class Subscription(Disposable):
def __init__(self, subject, observer):
self.subject = subject
self.observer = Atomic(observer)
def dispose(self):
old = self.observer.exchange(None)
if old != None:
self.subject.unsubscribe(old)
self.subject = None
class Subscription(Disposable):
def __init__(self, subject, observer):
self.subject = subject
self.observer = Atomic(observer)
def dispose(self):
old = self.observer.exchange(None)
if old != None:
self.subject.unsubscribe(old)
self.subject = None
def __init__(self, scheduler, observer):
super(ScheduledObserver, self).__init__()
self.scheduler = scheduler
self.observer = observer
self.state = Atomic(ScheduledObserver.STOPPED, self.lock)
self.disposable = SerialDisposable()
self.failed = False
self.exception = None
self.completed = False
self.queue = Queue()
self.dispatcherJob = None
self.dispatcherEvent = Semaphore(0)
class CheckedObserver(Observer):
IDLE = 0
BUSY = 1
DONE = 2
def __init__(self, observer):
super(CheckedObserver, self).__init__()
self.observer = observer
self.state = Atomic(CheckedObserver.IDLE)
def onNext(self, value):
self.checkAccess()
try:
self.observer.onNext(value)
finally:
self.state.value = CheckedObserver.IDLE
def onError(self, exception):
self.checkAccess()
try:
self.observer.onError(exception)
finally:
self.state.value = CheckedObserver.DONE
def onCompleted(self):
self.checkAccess()
try:
self.observer.onCompleted()
finally:
self.state.value = CheckedObserver.DONE
def checkAccess(self):
old = self.state.compareExchange(CheckedObserver.BUSY, CheckedObserver.IDLE)
if old == CheckedObserver.BUSY:
raise Exception("This observer is currently busy")
elif old == CheckedObserver.DONE:
raise Exception("This observer already terminated")
class CheckedObserver(Observer):
IDLE = 0
BUSY = 1
DONE = 2
def __init__(self, observer):
super(CheckedObserver, self).__init__()
self.observer = observer
self.state = Atomic(CheckedObserver.IDLE)
def onNext(self, value):
self.checkAccess()
try:
self.observer.onNext(value)
finally:
self.state.value = CheckedObserver.IDLE
def onError(self, exception):
self.checkAccess()
try:
self.observer.onError(exception)
finally:
self.state.value = CheckedObserver.DONE
def onCompleted(self):
self.checkAccess()
try:
self.observer.onCompleted()
finally:
self.state.value = CheckedObserver.DONE
def checkAccess(self):
old = self.state.compareExchange(CheckedObserver.BUSY, CheckedObserver.IDLE)
if old == CheckedObserver.BUSY:
raise Exception("This observer is currently busy")
elif old == CheckedObserver.DONE:
raise Exception("This observer already terminated")
class ObserveOnObserver(ScheduledObserver):
def __init__(self, scheduler, observer, cancel):
super(ObserveOnObserver, self).__init__(scheduler, observer)
self.cancel = Atomic(cancel, self.lock)
def onNextCore(self, value):
super(ObserveOnObserver, self).onNextCore(value)
self.ensureActive()
def onErrorCore(self, exception):
super(ObserveOnObserver, self).onErrorCore(exception)
self.ensureActive()
def onCompletedCore(self):
super(ObserveOnObserver, self).onCompletedCore()
self.ensureActive()
def dispose(self):
super(ObserveOnObserver, self).dispose()
old = self.cancel.exchange(None)
if old != None:
old.dispose()
class ObserveOnObserver(ScheduledObserver):
def __init__(self, scheduler, observer, cancel):
super(ObserveOnObserver, self).__init__(scheduler, observer)
self.cancel = Atomic(cancel, self.lock)
def onNextCore(self, value):
super(ObserveOnObserver, self).onNextCore(value)
self.ensureActive()
def onErrorCore(self, exception):
super(ObserveOnObserver, self).onErrorCore(exception)
self.ensureActive()
def onCompletedCore(self):
super(ObserveOnObserver, self).onCompletedCore()
self.ensureActive()
def dispose(self):
super(ObserveOnObserver, self).dispose()
old = self.cancel.exchange(None)
if old != None:
old.dispose()
def __init__(self, observer): super(CheckedObserver, self).__init__() self.observer = observer self.state = Atomic(CheckedObserver.IDLE)
class Subject(Observable, Observer):
def __init__(self):
super(Subject, self).__init__()
self.isDisposed = False
self.isStopped = False
self.exception = None
self.observer = Atomic(NoopObserver.instance)
def onCompleted(self):
old = None
new = DoneObserver.completed
while True:
old = self.observer.value
if old is DoneObserver.completed or isinstance(old, DoneObserver):
break
current = self.observer.compareExchange(new, old)
if old is current:
break
old.onCompleted()
def onError(self, exception):
old = None
new = DoneObserver(exception)
while True:
old = self.observer.value
if old is DoneObserver.completed or isinstance(old, DoneObserver):
break
current = self.observer.compareExchange(new, old)
if old is current:
break
old.onError(exception)
def onNext(self, value):
self.observer.value.onNext(value)
class Subscription(Disposable):
def __init__(self, subject, observer):
self.subject = subject
self.observer = Atomic(observer)
def dispose(self):
old = self.observer.exchange(None)
if old != None:
self.subject.unsubscribe(old)
self.subject = None
def subscribeCore(self, observer):
old = None
new = None
while True:
old = self.observer.value
if old is DisposedObserver.instance:
raise Exception("Object has been disposed")
if old is DoneObserver.completed:
observer.onCompleted()
return Disposable.empty()
if isinstance(old, DoneObserver):
observer.onError(old.exception)
return Disposable.empty()
if old is NoopObserver.instance:
new = observer
else:
if isinstance(old, ListObserver):
new = old.add(observer)
else:
new = ListObserver((old, observer))
current = self.observer.compareExchange(new, old)
if old is current:
break
return self.Subscription(self, observer)
def unsubscribe(self, observer):
old = None
new = None
while True:
old = self.observer.value
if old is DisposedObserver.instance or isinstance(old, DoneObserver):
return
if isinstance(old, ListObserver):
new = old.remove(observer)
elif observer is not old:
return
else:
new = NoopObserver.instance
current = self.observer.compareExchange(new, old)
if old is current:
return
def dispose(self):
self.observer.exchange(NoopObserver.instance)
@staticmethod
def create(observer, observable):
return AnonymousSubject(observer, observable)
@staticmethod
def synchronize(subject, scheduler=None):
if scheduler == None:
return AnonymousSubject(Observer.synchronize(subject), subject)
else:
return AnonymousSubject(Observer.synchronize(subject), subject.observeOn(scheduler))
def __init__(self, parent, observer, cancel): super(SkipUntilTime.Sink, self).__init__(observer, cancel) self.parent = parent self.open = Atomic(False)
def __init__(self): super(Subject, self).__init__() self.isDisposed = False self.isStopped = False self.exception = None self.observer = Atomic(NoopObserver.instance)
def __init__(self, observer): super(CheckedObserver, self).__init__() self.observer = observer self.state = Atomic(CheckedObserver.IDLE)
def __init__(self, parent):
self.parent = Atomic(parent)
def __init__(self):
super(Subject, self).__init__()
self.isDisposed = False
self.isStopped = False
self.exception = None
self.observer = Atomic(NoopObserver.instance)
def __init__(self): super(ObserverBase, self).__init__() self.isStopped = Atomic(False, self.lock)
class Subject(Observable, Observer):
def __init__(self):
super(Subject, self).__init__()
self.isDisposed = False
self.isStopped = False
self.exception = None
self.observer = Atomic(NoopObserver.instance)
def onCompleted(self):
old = None
new = DoneObserver.completed
while True:
old = self.observer.value
if old is DoneObserver.completed or isinstance(old, DoneObserver):
break
current = self.observer.compareExchange(new, old)
if old is current:
break
old.onCompleted()
def onError(self, exception):
old = None
new = DoneObserver(exception)
while True:
old = self.observer.value
if old is DoneObserver.completed or isinstance(old, DoneObserver):
break
current = self.observer.compareExchange(new, old)
if old is current:
break
old.onError(exception)
def onNext(self, value):
self.observer.value.onNext(value)
class Subscription(Disposable):
def __init__(self, subject, observer):
self.subject = subject
self.observer = Atomic(observer)
def dispose(self):
old = self.observer.exchange(None)
if old != None:
self.subject.unsubscribe(old)
self.subject = None
def subscribeCore(self, observer):
old = None
new = None
while True:
old = self.observer.value
if old is DisposedObserver.instance:
raise Exception("Object has been disposed")
if old is DoneObserver.completed:
observer.onCompleted()
return Disposable.empty()
if isinstance(old, DoneObserver):
observer.onError(old.exception)
return Disposable.empty()
if old is NoopObserver.instance:
new = observer
else:
if isinstance(old, ListObserver):
new = old.add(observer)
else:
new = ListObserver((old, observer))
current = self.observer.compareExchange(new, old)
if old is current:
break
return self.Subscription(self, observer)
def unsubscribe(self, observer):
old = None
new = None
while True:
old = self.observer.value
if old is DisposedObserver.instance or isinstance(
old, DoneObserver):
return
if isinstance(old, ListObserver):
new = old.remove(observer)
elif observer is not old:
return
else:
new = NoopObserver.instance
current = self.observer.compareExchange(new, old)
if old is current:
return
def dispose(self):
self.observer.exchange(NoopObserver.instance)
@staticmethod
def create(observer, observable):
return AnonymousSubject(observer, observable)
@staticmethod
def synchronize(subject, scheduler=None):
if scheduler == None:
return AnonymousSubject(Observer.synchronize(subject), subject)
else:
return AnonymousSubject(Observer.synchronize(subject),
subject.observeOn(scheduler))
def __init__(self, parent, observer, cancel):
super(Timer.PeriodSink, self).__init__(observer, cancel)
self.parent = parent
self.pendingTickCount = Atomic(0)
def __init__(self, observer, cancel):
super(Sink, self).__init__()
self.observer = observer
self.cancel = Atomic(cancel)
def __init__(self, observer, cancel): super(Sink, self).__init__() self.observer = observer self.cancel = Atomic(cancel)
class ScheduledObserver(ObserverBase):
STOPPED = 0
RUNNING = 1
PENDING = 2
FAULTED = 9
def __init__(self, scheduler, observer):
super(ScheduledObserver, self).__init__()
self.scheduler = scheduler
self.observer = observer
self.state = Atomic(ScheduledObserver.STOPPED, self.lock)
self.disposable = SerialDisposable()
self.failed = False
self.exception = None
self.completed = False
self.queue = Queue()
self.dispatcherJob = None
self.dispatcherEvent = Semaphore(0)
def ensureDispatcher(self):
if self.dispatcherJob != None:
return
with self.lock:
if self.dispatcherJob == None:
self.dispatcherJob = self.scheduler.scheduleLongRunning(self.dispatch)
self.disposable.disposable = CompositeDisposable(
self.dispatcherJob,
Disposable.create(self.dispatcherEvent.release)
)
def dispatch(self, cancel):
while True:
self.dispatcherEvent.acquire()
if cancel.isDisposed:
return
while True:
next = self.queue.get()
try:
self.observer.onNext(next)
except Exception as e:
self.clearQueue()
raise e
self.dispatcherEvent.acquire()
if cancel.isDisposed:
return
if self.failed:
self.observer.onError(self.exception)
self.dispose()
return
if self.completed:
self.observer.onCompleted()
self.dispose()
return
def ensureActive(self, n = 1):
if self.scheduler.isLongRunning:
while n > 0:
self.dispatcherEvent.release()
n -= 1
self.ensureDispatcher()
else:
self.ensureActiveSlow()
def ensureActiveSlow(self):
isOwner = False
while True:
old = self.state.compareExchange(
ScheduledObserver.RUNNING,
ScheduledObserver.STOPPED
)
if old == ScheduledObserver.STOPPED:
isOwner = True
break
elif old == ScheduledObserver.FAULTED:
return
elif (
(old == ScheduledObserver.PENDING or old == ScheduledObserver.RUNNING) and
self.state.compareExchange(ScheduledObserver.PENDING, ScheduledObserver.RUNNING) == ScheduledObserver.RUNNING
):
break
if isOwner:
self.disposable = self.scheduler.scheduleRecursiveWithState(None, self.run)
def run(self, state, continuation):
next = None
while True:
try:
next = self.queue.get_nowait()
except Empty:
next = None
if next != None:
break
if self.failed:
# wait until the queue is drained
if not self.queue.empty():
continue
self.state.value = ScheduledObserver.STOPPED
self.observer.onError(self.exception)
self.dispose()
return
if self.completed:
# wait until the queue is drained
if not self.queue.empty():
continue
self.state.value = ScheduledObserver.STOPPED
self.observer.onCompleted()
self.dispose()
return
old = self.state.compareExchange(
ScheduledObserver.STOPPED,
ScheduledObserver.RUNNING
)
if old == ScheduledObserver.RUNNING or old == ScheduledObserver.FAULTED:
return
# assert(old == ScheduledObserver.PENDING)
self.state.value = ScheduledObserver.RUNNING
#end while
# we found an item, so next != None
self.state.value = ScheduledObserver.RUNNING
try:
self.observer.onNext(next)
except Exception as e:
self.state.value = ScheduledObserver.FAULTED
self.clearQueue()
raise e
continuation(state)
def onNextCore(self, value):
self.queue.put(value)
def onErrorCore(self, exception):
self.exception = exception
self.failed = True
def onCompletedCore(self):
self.completed = True
def clearQueue(self):
try:
while True:
self.queue.get()
except Empty:
pass
def dispose(self):
super(ScheduledObserver, self).dispose()
self.disposable.dispose()
class PeriodSink(rx.linq.sink.Sink):
def __init__(self, parent, observer, cancel):
super(Timer.PeriodSink, self).__init__(observer, cancel)
self.parent = parent
self.pendingTickCount = Atomic(0)
def run(self):
if self.parent.isAbsolute:
return self.parent.scheduler.scheduleWithAbsoluteAndState(
None, self.parent.dueTime, self.invokeStart)
else:
dueTime = self.parent.dueTime
if dueTime == self.parent.period:
return self.parent.scheduler.schedulePeriodicWithState(
0, self.parent.period, self.tick)
return self.parent.scheduler.scheduleWithRelativeAndState(
None, dueTime, self.invokeStart)
def tick(self, count):
self.observer.onNext(count)
return count + 1
def invokeStart(self, scheduler, state):
#
# Notice the first call to OnNext will introduce skew if it takes significantly long when
# using the following naive implementation:
#
# Code: base._observer.OnNext(0L);
# return self.SchedulePeriodicEmulated(1L, _period, (Func<long, long>)Tick);
#
# What we're saying here is that Observable.Timer(dueTime, period) is pretty much the same
# as writing Observable.Timer(dueTime).Concat(Observable.Interval(period)).
#
# Expected: dueTime
# |
# 0--period--1--period--2--period--3--period--4--...
# |
# +-OnNext(0L)-|
#
# Actual: dueTime
# |
# 0------------#--period--1--period--2--period--3--period--4--...
# |
# +-OnNext(0L)-|
#
# Different solutions for this behavior have different problems:
#
# 1. Scheduling the periodic job first and using an AsyncLock to serialize the OnNext calls
# has the drawback that InvokeStart may never return. This happens when every callback
# doesn't meet the period's deadline, hence the periodic job keeps queueing stuff up. In
# this case, InvokeStart stays the owner of the AsyncLock and the call to Wait will never
# return, thus not allowing any interleaving of work on this scheduler's logical thread.
#
# 2. Scheduling the periodic job first and using a (blocking) synchronization primitive to
# signal completion of the OnNext(0L) call to the Tick call requires quite a bit of state
# and careful handling of the case when OnNext(0L) throws. What's worse is the blocking
# behavior inside Tick.
#
# In order to avoid blocking behavior, we need a scheme much like SchedulePeriodic emulation
# where work to dispatch OnNext(n + 1) is delegated to a catch up loop in case OnNext(n) was
# still running. Because SchedulePeriodic emulation exhibits such behavior in all cases, we
# only need to deal with the overlap of OnNext(0L) with future periodic OnNext(n) dispatch
# jobs. In the worst case where every callback takes longer than the deadline implied by the
# period, the periodic job will just queue up work that's dispatched by the tail-recursive
# catch up loop. In the best case, all work will be dispatched on the periodic scheduler.
#
#
# We start with one tick pending because we're about to start doing OnNext(0L).
#
self.pendingTickCount.value = 1
d = SingleAssignmentDisposable()
self.periodic = d
d.disposable = scheduler.schedulePeriodicWithState(
1, self.parent.period, self.tock)
try:
self.observer.onNext(0)
except Exception as e:
d.dispose()
raise e
#
# If the periodic scheduling job already ran before we finished dispatching the OnNext(0L)
# call, we'll find pendingTickCount to be > 1. In this case, we need to catch up by dispatching
# subsequent calls to OnNext as fast as possible, but without running a loop in order to ensure
# fair play with the scheduler. So, we run a tail-recursive loop in CatchUp instead.
#
if self.pendingTickCount.dec() > 0:
c = SingleAssignmentDisposable()
c.disposable = scheduler.scheduleRecursiveWithState(
1, self.catchUp)
return CompositeDisposable(d, c)
return d
def tock(self, count):
if self.pendingTickCount.inc() == 1:
self.observer.onNext(count)
self.pendingTickCount.dec()
return count + 1
def catchUp(self, count, recurse):
try:
self.observer.onNext(count)
except Exception as e:
self.periodic.dispose()
raise e
#
# We can simply bail out if we decreased the tick count to 0. In that case, the Tock
# method will take over when it sees the 0 -> 1 transition.
#
if self.pendingTickCount.dec() > 0:
recurse(count + 1)
def __init__(self):
super(Cancelable, self).__init__()
self._isDisposed = Atomic(False)
def __init__(self, subject, observer):
self.subject = subject
self.observer = Atomic(observer)
def __init__(self, scheduler, observer, cancel): super(ObserveOnObserver, self).__init__(scheduler, observer) self.cancel = Atomic(cancel, self.lock)
def __init__(self, subject, observer): self.subject = subject self.observer = Atomic(observer)
def __init__(self): super(ObserverBase, self).__init__() self.isStopped = Atomic(False, self.lock)
class ScheduledObserver(ObserverBase):
STOPPED = 0
RUNNING = 1
PENDING = 2
FAULTED = 9
def __init__(self, scheduler, observer):
super(ScheduledObserver, self).__init__()
self.scheduler = scheduler
self.observer = observer
self.state = Atomic(ScheduledObserver.STOPPED, self.lock)
self.disposable = SerialDisposable()
self.failed = False
self.exception = None
self.completed = False
self.queue = Queue()
self.dispatcherJob = None
self.dispatcherEvent = Semaphore(0)
def ensureDispatcher(self):
if self.dispatcherJob != None:
return
with self.lock:
if self.dispatcherJob == None:
self.dispatcherJob = self.scheduler.scheduleLongRunning(self.dispatch)
self.disposable.disposable = CompositeDisposable(
self.dispatcherJob,
Disposable.create(self.dispatcherEvent.release)
)
def dispatch(self, cancel):
while True:
self.dispatcherEvent.acquire()
if cancel.isDisposed:
return
while True:
next = self.queue.get()
try:
self.observer.onNext(next)
except Exception as e:
self.clearQueue()
raise e
self.dispatcherEvent.acquire()
if cancel.isDisposed:
return
if self.failed:
self.observer.onError(self.exception)
self.dispose()
return
if self.completed:
self.observer.onCompleted()
self.dispose()
return
def ensureActive(self, n = 1):
if self.scheduler.isLongRunning:
while n > 0:
self.dispatcherEvent.release()
n -= 1
self.ensureDispatcher()
else:
self.ensureActiveSlow()
def ensureActiveSlow(self):
isOwner = False
while True:
old = self.state.compareExchange(
ScheduledObserver.RUNNING,
ScheduledObserver.STOPPED
)
if old == ScheduledObserver.STOPPED:
isOwner = True
break
elif old == ScheduledObserver.FAULTED:
return
elif (
(old == ScheduledObserver.PENDING or old == ScheduledObserver.RUNNING) and
self.state.compareExchange(ScheduledObserver.PENDING, ScheduledObserver.RUNNING) == ScheduledObserver.RUNNING
):
break
if isOwner:
self.disposable = self.scheduler.scheduleRecursiveWithState(None, self.run)
def run(self, state, continuation):
next = None
while True:
try:
next = self.queue.get_nowait()
except Empty:
next = None
if next != None:
break
if self.failed:
# wait until the queue is drained
if not self.queue.empty():
continue
self.state.value = ScheduledObserver.STOPPED
self.observer.onError(self.exception)
self.dispose()
return
if self.completed:
# wait until the queue is drained
if not self.queue.empty():
continue
self.state.value = ScheduledObserver.STOPPED
self.observer.onCompleted()
self.dispose()
return
old = self.state.compareExchange(
ScheduledObserver.STOPPED,
ScheduledObserver.RUNNING
)
if old == ScheduledObserver.RUNNING or old == ScheduledObserver.FAULTED:
return
# assert(old == ScheduledObserver.PENDING)
self.state.value = ScheduledObserver.RUNNING
#end while
# we found an item, so next != None
self.state.value = ScheduledObserver.RUNNING
try:
self.observer.onNext(next)
except Exception as e:
self.state.value = ScheduledObserver.FAULTED
self.clearQueue()
raise e
continuation(state)
def onNextCore(self, value):
self.queue.put(value)
def onErrorCore(self, exception):
self.exception = exception
self.failed = True
def onCompletedCore(self):
self.completed = True
def clearQueue(self):
try:
while True:
self.queue.get()
except Empty:
pass
def dispose(self):
super(ScheduledObserver, self).dispose()
self.disposable.dispose()
def __init__(self, parent): self.parent = Atomic(parent)
def __init__(self, scheduler, observer, cancel): super(ObserveOnObserver, self).__init__(scheduler, observer) self.cancel = Atomic(cancel, self.lock)