Class BasicFuseableSubscriber<T,R>
- java.lang.Object
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- io.reactivex.rxjava3.internal.subscribers.BasicFuseableSubscriber<T,R>
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- Type Parameters:
T
- the upstream value typeR
- the downstream value type
- All Implemented Interfaces:
FlowableSubscriber<T>
,QueueFuseable<R>
,QueueSubscription<R>
,SimpleQueue<R>
,org.reactivestreams.Subscriber<T>
,org.reactivestreams.Subscription
- Direct Known Subclasses:
FlowableDistinct.DistinctSubscriber
,FlowableDistinctUntilChanged.DistinctUntilChangedSubscriber
,FlowableDoAfterNext.DoAfterSubscriber
,FlowableDoOnEach.DoOnEachSubscriber
,FlowableFilter.FilterSubscriber
,FlowableMap.MapSubscriber
,FlowableMapOptional.MapOptionalSubscriber
public abstract class BasicFuseableSubscriber<T,R> extends java.lang.Object implements FlowableSubscriber<T>, QueueSubscription<R>
Base class for a fuseable intermediate subscriber.
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Field Summary
Fields Modifier and Type Field Description protected boolean
done
Flag indicating no further onXXX event should be accepted.protected org.reactivestreams.Subscriber<? super R>
downstream
The downstream subscriber.protected QueueSubscription<T>
qs
The upstream's QueueSubscription if not null.protected int
sourceMode
Holds the established fusion mode of the upstream.protected org.reactivestreams.Subscription
upstream
The upstream subscription.
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Constructor Summary
Constructors Constructor Description BasicFuseableSubscriber(org.reactivestreams.Subscriber<? super R> downstream)
Construct a BasicFuseableSubscriber by wrapping the given subscriber.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
afterDownstream()
Override this to perform actions after the call toactual.onSubscribe(this)
happened.protected boolean
beforeDownstream()
Override this to perform actions before the callactual.onSubscribe(this)
happens.void
cancel()
void
clear()
Removes all enqueued items from this queue.protected void
fail(java.lang.Throwable t)
Rethrows the throwable if it is a fatal exception or callsonError(Throwable)
.boolean
isEmpty()
Returns true if the queue is empty.boolean
offer(R e)
Atomically enqueue a single value.boolean
offer(R v1, R v2)
Atomically enqueue two values.void
onComplete()
void
onError(java.lang.Throwable t)
void
onSubscribe(org.reactivestreams.Subscription s)
Implementors of this method should make sure everything that needs to be visible inSubscriber.onNext(Object)
is established before callingSubscription.request(long)
.void
request(long n)
protected int
transitiveBoundaryFusion(int mode)
Calls the upstream's QueueSubscription.requestFusion with the mode and saves the established mode insourceMode
if that mode doesn't have theQueueFuseable.BOUNDARY
flag set.-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface io.reactivex.rxjava3.operators.QueueFuseable
requestFusion
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Methods inherited from interface io.reactivex.rxjava3.operators.SimpleQueue
poll
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Field Detail
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downstream
protected final org.reactivestreams.Subscriber<? super R> downstream
The downstream subscriber.
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upstream
protected org.reactivestreams.Subscription upstream
The upstream subscription.
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qs
protected QueueSubscription<T> qs
The upstream's QueueSubscription if not null.
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done
protected boolean done
Flag indicating no further onXXX event should be accepted.
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sourceMode
protected int sourceMode
Holds the established fusion mode of the upstream.
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Constructor Detail
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BasicFuseableSubscriber
public BasicFuseableSubscriber(org.reactivestreams.Subscriber<? super R> downstream)
Construct a BasicFuseableSubscriber by wrapping the given subscriber.- Parameters:
downstream
- the subscriber, not null (not verified)
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Method Detail
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onSubscribe
public final void onSubscribe(org.reactivestreams.Subscription s)
Description copied from interface:FlowableSubscriber
Implementors of this method should make sure everything that needs to be visible inSubscriber.onNext(Object)
is established before callingSubscription.request(long)
. In practice this means no initialization should happen after therequest()
call and additional behavior is thread safe in respect toonNext
.- Specified by:
onSubscribe
in interfaceFlowableSubscriber<T>
- Specified by:
onSubscribe
in interfaceorg.reactivestreams.Subscriber<T>
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beforeDownstream
protected boolean beforeDownstream()
Override this to perform actions before the callactual.onSubscribe(this)
happens.- Returns:
- true if onSubscribe should continue with the call
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afterDownstream
protected void afterDownstream()
Override this to perform actions after the call toactual.onSubscribe(this)
happened.
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onError
public void onError(java.lang.Throwable t)
- Specified by:
onError
in interfaceorg.reactivestreams.Subscriber<T>
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fail
protected final void fail(java.lang.Throwable t)
Rethrows the throwable if it is a fatal exception or callsonError(Throwable)
.- Parameters:
t
- the throwable to rethrow or signal to the actual subscriber
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onComplete
public void onComplete()
- Specified by:
onComplete
in interfaceorg.reactivestreams.Subscriber<T>
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transitiveBoundaryFusion
protected final int transitiveBoundaryFusion(int mode)
Calls the upstream's QueueSubscription.requestFusion with the mode and saves the established mode insourceMode
if that mode doesn't have theQueueFuseable.BOUNDARY
flag set.If the upstream doesn't support fusion (
qs
is null), the method returnsQueueFuseable.NONE
.- Parameters:
mode
- the fusion mode requested- Returns:
- the established fusion mode
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request
public void request(long n)
- Specified by:
request
in interfaceorg.reactivestreams.Subscription
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cancel
public void cancel()
- Specified by:
cancel
in interfaceorg.reactivestreams.Subscription
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isEmpty
public boolean isEmpty()
Description copied from interface:SimpleQueue
Returns true if the queue is empty.Note however that due to potential fused functions in
SimpleQueue.poll()
it is possible this method returns false but then poll() returns null because the fused function swallowed the available item(s).- Specified by:
isEmpty
in interfaceSimpleQueue<T>
- Returns:
- true if the queue is empty
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clear
public void clear()
Description copied from interface:SimpleQueue
Removes all enqueued items from this queue.- Specified by:
clear
in interfaceSimpleQueue<T>
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offer
public final boolean offer(R e)
Description copied from interface:SimpleQueue
Atomically enqueue a single value.- Specified by:
offer
in interfaceSimpleQueue<T>
- Parameters:
e
- the value to enqueue, not null- Returns:
- true if successful, false if the value was not enqueued likely due to reaching the queue capacity)
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offer
public final boolean offer(R v1, R v2)
Description copied from interface:SimpleQueue
Atomically enqueue two values.- Specified by:
offer
in interfaceSimpleQueue<T>
- Parameters:
v1
- the first value to enqueue, not nullv2
- the second value to enqueue, not null- Returns:
- true if successful, false if the value was not enqueued likely due to reaching the queue capacity)
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