Package rx.internal.operators
Class OperatorPublish.InnerProducer<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.OperatorPublish.InnerProducer<T>
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- Type Parameters:
T
- the value type
- All Implemented Interfaces:
java.io.Serializable
,Producer
,Subscription
- Enclosing class:
- OperatorPublish<T>
static final class OperatorPublish.InnerProducer<T> extends java.util.concurrent.atomic.AtomicLong implements Producer, Subscription
A Producer and Subscription that manages the request and unsubscription state of a child subscriber in thread-safe manner. We use AtomicLong as a base class to save on extra allocation of an AtomicLong and also save the overhead of the AtomicIntegerFieldUpdater.
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Field Summary
Fields Modifier and Type Field Description (package private) Subscriber<? super T>
child
The actual child subscriber.(package private) static long
NOT_REQUESTED
Indicates this child has not yet requested any value.(package private) OperatorPublish.PublishSubscriber<T>
parent
The parent subscriber-to-source used to allow removing the child in case of child unsubscription.private static long
serialVersionUID
(package private) static long
UNSUBSCRIBED
Indicates this child has been unsubscribed: the state is swapped in atomically and will prevent the dispatch() to emit (too many) values to a terminated child subscriber.
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Constructor Summary
Constructors Constructor Description InnerProducer(OperatorPublish.PublishSubscriber<T> parent, Subscriber<? super T> child)
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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)
Indicate that values have been emitted to this child subscriber by the dispatch() method.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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parent
final OperatorPublish.PublishSubscriber<T> parent
The parent subscriber-to-source used to allow removing the child in case of child unsubscription.
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child
final Subscriber<? super T> child
The actual child subscriber.
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UNSUBSCRIBED
static final long UNSUBSCRIBED
Indicates this child has been unsubscribed: the state is swapped in atomically and will prevent the dispatch() to emit (too many) values to a terminated child subscriber.- See Also:
- Constant Field Values
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NOT_REQUESTED
static final long NOT_REQUESTED
Indicates this child has not yet requested any value. We pretend we don't see such child subscribers in dispatch() to allow other child subscribers who have requested to make progress. In a concurrent subscription scenario, one can't be sure when a subscription happens exactly so this virtual shift should not cause any problems.- See Also:
- Constant Field Values
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Constructor Detail
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InnerProducer
public InnerProducer(OperatorPublish.PublishSubscriber<T> parent, Subscriber<? super T> child)
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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)
Indicate that values have been emitted to this child subscriber by the dispatch() method.- Parameters:
n
- the number of items emitted- Returns:
- the updated request value (may indicate how much can be produced or a terminal state)
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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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