Package rx.internal.operators
Class CachedObservable.ReplayProducer<T>
- java.lang.Object
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- java.lang.Number
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- java.util.concurrent.atomic.AtomicLong
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- rx.internal.operators.CachedObservable.ReplayProducer<T>
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- Type Parameters:
T
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- All Implemented Interfaces:
java.io.Serializable
,Producer
,Subscription
- Enclosing class:
- CachedObservable<T>
static final class CachedObservable.ReplayProducer<T> extends java.util.concurrent.atomic.AtomicLong implements Producer, Subscription
Keeps track of the current request amount and the replay position for a child Subscriber.
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Field Summary
Fields Modifier and Type Field Description (package private) Subscriber<? super T>
child
The actual child subscriber.(package private) java.lang.Object[]
currentBuffer
Contains the reference to the buffer segment in replay.(package private) int
currentIndexInBuffer
Contains the index into the currentBuffer where the next value is expected.(package private) boolean
emitting
Indicates there is a replay going on; guarded by this.(package private) int
index
Contains the absolute index up until the values have been replayed so far.(package private) boolean
missed
Indicates there were some state changes/replay attempts; guarded by this.private static long
serialVersionUID
(package private) CachedObservable.CacheState<T>
state
The cache state object.
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Constructor Summary
Constructors Constructor Description ReplayProducer(Subscriber<? super T> child, CachedObservable.CacheState<T> state)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
isUnsubscribed()
Indicates whether thisSubscription
is currently unsubscribed.long
produced(long n)
Updates the request count to reflect values have been produced.void
replay()
Continue replaying available values if there are requests for them.void
request(long n)
Request a certain maximum number of items from this Producer.void
unsubscribe()
Stops the receipt of notifications on theSubscriber
that was registered when this Subscription was received.-
Methods inherited from class java.util.concurrent.atomic.AtomicLong
accumulateAndGet, addAndGet, compareAndExchange, compareAndExchangeAcquire, compareAndExchangeRelease, compareAndSet, decrementAndGet, doubleValue, floatValue, get, getAcquire, getAndAccumulate, getAndAdd, getAndDecrement, getAndIncrement, getAndSet, getAndUpdate, getOpaque, getPlain, incrementAndGet, intValue, lazySet, longValue, set, setOpaque, setPlain, setRelease, toString, updateAndGet, weakCompareAndSet, weakCompareAndSetAcquire, weakCompareAndSetPlain, weakCompareAndSetRelease, weakCompareAndSetVolatile
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Field Detail
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serialVersionUID
private static final long serialVersionUID
- See Also:
- Constant Field Values
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child
final Subscriber<? super T> child
The actual child subscriber.
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state
final CachedObservable.CacheState<T> state
The cache state object.
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currentBuffer
java.lang.Object[] currentBuffer
Contains the reference to the buffer segment in replay. Accessed after reading state.size() and when emitting == true.
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currentIndexInBuffer
int currentIndexInBuffer
Contains the index into the currentBuffer where the next value is expected. Accessed after reading state.size() and when emitting == true.
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index
int index
Contains the absolute index up until the values have been replayed so far.
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emitting
boolean emitting
Indicates there is a replay going on; guarded by this.
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missed
boolean missed
Indicates there were some state changes/replay attempts; guarded by this.
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Constructor Detail
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ReplayProducer
public ReplayProducer(Subscriber<? super T> child, CachedObservable.CacheState<T> state)
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Method Detail
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request
public void request(long n)
Description copied from interface:Producer
Request a certain maximum number of items from this Producer. This is a way of requesting backpressure. To disable backpressure, passLong.MAX_VALUE
to this method.Requests are additive but if a sequence of requests totals more than
Long.MAX_VALUE
thenLong.MAX_VALUE
requests will be actioned and the extras may be ignored. Arriving atLong.MAX_VALUE
by addition of requests cannot be assumed to disable backpressure. For example, the code below may result inLong.MAX_VALUE
requests being actioned only.request(100); request(Long.MAX_VALUE-1);
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produced
public long produced(long n)
Updates the request count to reflect values have been produced.- Parameters:
n
- the produced item count, positive, not validated- Returns:
- the latest request amount after subtracting n
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isUnsubscribed
public boolean isUnsubscribed()
Description copied from interface:Subscription
Indicates whether thisSubscription
is currently unsubscribed.- Specified by:
isUnsubscribed
in interfaceSubscription
- Returns:
true
if thisSubscription
is currently unsubscribed,false
otherwise
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unsubscribe
public void unsubscribe()
Description copied from interface:Subscription
Stops the receipt of notifications on theSubscriber
that was registered when this Subscription was received.This allows unregistering an
Subscriber
before it has finished receiving all events (i.e. before onCompleted is called).- Specified by:
unsubscribe
in interfaceSubscription
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replay
public void replay()
Continue replaying available values if there are requests for them.
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