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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* Copyright (c) 2016-2023 VMware Inc. or its affiliates, All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package reactor.core.publisher;
import java.util.Objects;
import java.util.Queue;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Stream;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Exceptions;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;
/**
* Emits the last value from upstream only if there were no newer values emitted
* during the time window provided by a publisher for that particular last value.
*
* @param the source value type
* @param the value type of the duration publisher
*
* @see Reactive-Streams-Commons
*/
final class FluxSampleTimeout extends InternalFluxOperator {
final Function> throttler;
final Supplier> queueSupplier;
FluxSampleTimeout(Flux source,
Function> throttler,
Supplier> queueSupplier) {
super(source);
this.throttler = Objects.requireNonNull(throttler, "throttler");
this.queueSupplier = Objects.requireNonNull(queueSupplier, "queueSupplier");
}
@Override
public int getPrefetch() {
return Integer.MAX_VALUE;
}
@Override
@SuppressWarnings({"rawtypes", "unchecked"})
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
Queue> q = (Queue) queueSupplier.get();
SampleTimeoutMain main = new SampleTimeoutMain<>(actual, throttler, q);
actual.onSubscribe(main);
return main;
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class SampleTimeoutMainimplements InnerOperator {
final Function> throttler;
final Queue> queue;
final CoreSubscriber actual;
final Context ctx;
volatile Subscription s;
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater S =
AtomicReferenceFieldUpdater.newUpdater(SampleTimeoutMain.class,
Subscription.class,
"s");
volatile Subscription other;
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater
OTHER = AtomicReferenceFieldUpdater.newUpdater(SampleTimeoutMain.class,
Subscription.class,
"other");
volatile long requested;
@SuppressWarnings("rawtypes")
static final AtomicLongFieldUpdater REQUESTED =
AtomicLongFieldUpdater.newUpdater(SampleTimeoutMain.class, "requested");
volatile int wip;
@SuppressWarnings("rawtypes")
static final AtomicIntegerFieldUpdater WIP =
AtomicIntegerFieldUpdater.newUpdater(SampleTimeoutMain.class, "wip");
volatile Throwable error;
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater ERROR =
AtomicReferenceFieldUpdater.newUpdater(SampleTimeoutMain.class,
Throwable.class,
"error");
volatile boolean done;
volatile boolean cancelled;
volatile long index;
@SuppressWarnings("rawtypes")
static final AtomicLongFieldUpdater INDEX =
AtomicLongFieldUpdater.newUpdater(SampleTimeoutMain.class, "index");
SampleTimeoutMain(CoreSubscriber actual,
Function> throttler,
Queue> queue) {
this.actual = actual;
this.ctx = actual.currentContext();
this.throttler = throttler;
this.queue = queue;
}
@Override
public Stream inners() {
return Stream.of(Scannable.from(other));
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.TERMINATED) return done;
if (key == Attr.CANCELLED) return cancelled;
if (key == Attr.PARENT) return s;
if (key == Attr.ERROR) return error;
if (key == Attr.REQUESTED_FROM_DOWNSTREAM) return requested;
if (key == Attr.BUFFERED) return queue.size();
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
public final CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
if (Operators.validate(n)) {
Operators.addCap(REQUESTED, this, n);
}
}
@Override
public void cancel() {
if (!cancelled) {
cancelled = true;
Operators.terminate(S, this);
Operators.terminate(OTHER, this);
Operators.onDiscardQueueWithClear(queue, ctx, SampleTimeoutOther::toStream);
}
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.setOnce(S, this, s)) {
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
long idx = INDEX.incrementAndGet(this);
if (!Operators.set(OTHER, this, Operators.emptySubscription())) {
return;
}
Publisher p;
try {
p = Objects.requireNonNull(throttler.apply(t),
"throttler returned a null publisher");
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, ctx));
return;
}
SampleTimeoutOther os = new SampleTimeoutOther<>(this, t, idx);
if (Operators.replace(OTHER, this, os)) {
p = Operators.toFluxOrMono(p);
p.subscribe(os);
}
}
void error(Throwable t) {
if (Exceptions.addThrowable(ERROR, this, t)) {
done = true;
drain();
}
else {
Operators.onErrorDropped(t, ctx);
}
}
@Override
public void onError(Throwable t) {
Operators.terminate(OTHER, this);
error(t);
}
@Override
public void onComplete() {
Subscription o = other;
if (o instanceof FluxSampleTimeout.SampleTimeoutOther) {
SampleTimeoutOther os = (SampleTimeoutOther) o;
os.cancel();
os.onComplete();
}
done = true;
drain();
}
void otherNext(SampleTimeoutOther other) {
queue.offer(other);
drain();
}
void otherError(long idx, Throwable e) {
if (idx == index) {
Operators.terminate(S, this);
error(e);
}
else {
Operators.onErrorDropped(e, ctx);
}
}
void drain() {
if (WIP.getAndIncrement(this) != 0) {
return;
}
final Subscriber a = actual;
final Queue> q = queue;
int missed = 1;
for (; ; ) {
for (; ; ) {
boolean d = done;
SampleTimeoutOther o = q.poll();
boolean empty = o == null;
if (checkTerminated(d, empty, a, q)) {
return;
}
if (empty) {
break;
}
if (o.index == index) {
long r = requested;
if (r != 0) {
a.onNext(o.value);
if (r != Long.MAX_VALUE) {
REQUESTED.decrementAndGet(this);
}
}
else {
cancel();
Operators.onDiscardQueueWithClear(q, ctx, SampleTimeoutOther::toStream);
Throwable e = Exceptions.failWithOverflow(
"Could not emit value due to lack of requests");
Exceptions.addThrowable(ERROR, this, e);
e = Exceptions.terminate(ERROR, this);
a.onError(e);
return;
}
}
}
missed = WIP.addAndGet(this, -missed);
if (missed == 0) {
break;
}
}
}
boolean checkTerminated(boolean d, boolean empty, Subscriber a, Queue> q) {
if (cancelled) {
Operators.onDiscardQueueWithClear(q, ctx, SampleTimeoutOther::toStream);
return true;
}
if (d) {
Throwable e = Exceptions.terminate(ERROR, this);
if (e != null && e != Exceptions.TERMINATED) {
cancel();
Operators.onDiscardQueueWithClear(q, ctx, SampleTimeoutOther::toStream);
a.onError(e);
return true;
}
else if (empty) {
a.onComplete();
return true;
}
}
return false;
}
}
static final class SampleTimeoutOther extends Operators.DeferredSubscription
implements InnerConsumer {
final SampleTimeoutMain main;
final T value;
final long index;
volatile int once;
@SuppressWarnings("rawtypes")
static final AtomicIntegerFieldUpdater ONCE =
AtomicIntegerFieldUpdater.newUpdater(SampleTimeoutOther.class, "once");
SampleTimeoutOther(SampleTimeoutMain main, T value, long index) {
this.main = main;
this.value = value;
this.index = index;
}
@Override
public Context currentContext() {
return main.currentContext();
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.TERMINATED) return once == 1;
if (key == Attr.ACTUAL) return main;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
@Override
public void onSubscribe(Subscription s) {
if (set(s)) {
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(U t) {
if (ONCE.compareAndSet(this, 0, 1)) {
cancel();
main.otherNext(this);
}
}
@Override
public void onError(Throwable t) {
if (ONCE.compareAndSet(this, 0, 1)) {
main.otherError(index, t);
}
else {
Operators.onErrorDropped(t, main.currentContext());
}
}
@Override
public void onComplete() {
if (ONCE.compareAndSet(this, 0, 1)) {
main.otherNext(this);
}
}
final Stream toStream() {
return Stream.of(value);
}
}
}
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