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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
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/*
* 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.concurrent.Callable;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.function.Function;
import java.util.stream.Stream;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;
final class MonoFlatMapMany extends FluxFromMonoOperator {
final Function super T, ? extends Publisher extends R>> mapper;
MonoFlatMapMany(Mono extends T> source,
Function super T, ? extends Publisher extends R>> mapper) {
super(source);
this.mapper = mapper;
}
@Override
public CoreSubscriber super T> subscribeOrReturn(CoreSubscriber super R> actual) {
//for now Mono in general doesn't support onErrorContinue, so the scalar version shouldn't either
//even if the result is a Flux. once the mapper is applied, onErrorContinue will be taken care of by
//the mapped Flux if relevant.
if (FluxFlatMap.trySubscribeScalarMap(source, actual, mapper, false, false)) {
return null;
}
return new FlatMapManyMain(actual, mapper);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class FlatMapManyMain implements InnerOperator {
final CoreSubscriber super R> actual;
final Function super T, ? extends Publisher extends R>> mapper;
Subscription main;
volatile Subscription inner;
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater INNER =
AtomicReferenceFieldUpdater.newUpdater(FlatMapManyMain.class,
Subscription.class,
"inner");
volatile long requested;
@SuppressWarnings("rawtypes")
static final AtomicLongFieldUpdater REQUESTED =
AtomicLongFieldUpdater.newUpdater(FlatMapManyMain.class, "requested");
boolean hasValue;
FlatMapManyMain(CoreSubscriber super R> actual,
Function super T, ? extends Publisher extends R>> mapper) {
this.actual = actual;
this.mapper = mapper;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return main;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
public Stream extends Scannable> inners() {
return Stream.of(Scannable.from(inner));
}
@Override
public CoreSubscriber super R> actual() {
return actual;
}
@Override
public void request(long n) {
Subscription a = inner;
if (a != null) {
a.request(n);
}
else {
if (Operators.validate(n)) {
Operators.addCap(REQUESTED, this, n);
a = inner;
if (a != null) {
n = REQUESTED.getAndSet(this, 0L);
if (n != 0L) {
a.request(n);
}
}
}
}
}
@Override
public void cancel() {
main.cancel();
Operators.terminate(INNER, this);
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.main, s)) {
this.main = s;
actual.onSubscribe(this);
s.request(Long.MAX_VALUE);
}
}
void onSubscribeInner(Subscription s) {
if (Operators.setOnce(INNER, this, s)) {
long r = REQUESTED.getAndSet(this, 0L);
if (r != 0) {
s.request(r);
}
}
}
@SuppressWarnings("unchecked")
@Override
public void onNext(T t) {
hasValue = true;
Publisher extends R> p;
try {
p = Objects.requireNonNull(mapper.apply(t),
"The mapper returned a null Publisher.");
}
catch (Throwable ex) {
//if the mapping fails, then there is nothing to be continued, since the source is a Mono
actual.onError(Operators.onOperatorError(this, ex, t,
actual.currentContext()));
return;
}
if (p instanceof Callable) {
R v;
try {
v = ((Callable) p).call();
}
catch (Throwable ex) {
actual.onError(Operators.onOperatorError(this, ex, t,
actual.currentContext()));
return;
}
if (v == null) {
actual.onComplete();
}
else {
onSubscribeInner(Operators.scalarSubscription(actual, v));
}
return;
}
p = Operators.toFluxOrMono(p);
p.subscribe(new FlatMapManyInner<>(this, actual));
}
@Override
public void onError(Throwable t) {
if (hasValue) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
actual.onError(t);
}
@Override
public void onComplete() {
if (!hasValue) {
actual.onComplete();
}
}
}
static final class FlatMapManyInner implements InnerConsumer {
final FlatMapManyMain, R> parent;
final CoreSubscriber super R> actual;
FlatMapManyInner(FlatMapManyMain, R> parent,
CoreSubscriber super R> actual) {
this.parent = parent;
this.actual = actual;
}
@Override
public Context currentContext() {
return actual.currentContext();
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return parent.inner;
if (key == Attr.ACTUAL) return parent;
if (key == Attr.REQUESTED_FROM_DOWNSTREAM) return parent.requested;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return null;
}
@Override
public void onSubscribe(Subscription s) {
parent.onSubscribeInner(s);
}
@Override
public void onNext(R t) {
actual.onNext(t);
}
@Override
public void onError(Throwable t) {
actual.onError(t);
}
@Override
public void onComplete() {
actual.onComplete();
}
}
}
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