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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-present, RxJava Contributors.
*
* 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
*
* http://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 io.reactivex.rxjava3.internal.jdk8;
import java.util.*;
import java.util.concurrent.atomic.AtomicLong;
import java.util.stream.Stream;
import org.reactivestreams.Subscriber;
import io.reactivex.rxjava3.annotations.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Function;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.internal.util.BackpressureHelper;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
/**
* Map the success value into a Java {@link Stream} and emits its values.
*
* @param the source value type
* @param the output value type
* @since 3.0.0
*/
public final class MaybeFlattenStreamAsFlowable extends Flowable {
final Maybe source;
final Function> mapper;
public MaybeFlattenStreamAsFlowable(Maybe source, Function> mapper) {
this.source = source;
this.mapper = mapper;
}
@Override
protected void subscribeActual(@NonNull Subscriber s) {
source.subscribe(new FlattenStreamMultiObserver<>(s, mapper));
}
static final class FlattenStreamMultiObserver
extends BasicIntQueueSubscription
implements MaybeObserver, SingleObserver {
private static final long serialVersionUID = 7363336003027148283L;
final Subscriber downstream;
final Function> mapper;
final AtomicLong requested;
Disposable upstream;
volatile Iterator iterator;
AutoCloseable close;
boolean once;
volatile boolean cancelled;
boolean outputFused;
long emitted;
FlattenStreamMultiObserver(Subscriber downstream, Function> mapper) {
this.downstream = downstream;
this.mapper = mapper;
this.requested = new AtomicLong();
}
@Override
public void onSubscribe(@NonNull Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onSuccess(@NonNull T t) {
try {
Stream stream = Objects.requireNonNull(mapper.apply(t), "The mapper returned a null Stream");
Iterator iterator = stream.iterator();
AutoCloseable c = stream;
if (!iterator.hasNext()) {
downstream.onComplete();
close(c);
return;
}
this.iterator = iterator;
this.close = stream;
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
downstream.onError(ex);
return;
}
drain();
}
@Override
public void onError(@NonNull Throwable e) {
downstream.onError(e);
}
@Override
public void onComplete() {
downstream.onComplete();
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
BackpressureHelper.add(requested, n);
drain();
}
}
@Override
public void cancel() {
cancelled = true;
upstream.dispose();
if (!outputFused) {
drain();
}
}
@Override
public int requestFusion(int mode) {
if ((mode & ASYNC) != 0) {
outputFused = true;
return ASYNC;
}
return NONE;
}
@Override
public @Nullable R poll() throws Throwable {
Iterator it = iterator;
if (it != null) {
if (once) {
if (!it.hasNext()) {
clear();
return null;
}
} else {
once = true;
}
return it.next();
}
return null;
}
@Override
public boolean isEmpty() {
Iterator it = iterator;
if (it != null) {
if (!once) {
return false;
}
if (it.hasNext()) {
return false;
}
clear();
}
return true;
}
@Override
public void clear() {
iterator = null;
AutoCloseable close = this.close;
this.close = null;
close(close);
}
void close(AutoCloseable c) {
try {
if (c != null) {
c.close();
}
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
RxJavaPlugins.onError(ex);
}
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
int missed = 1;
Subscriber downstream = this.downstream;
long emitted = this.emitted;
long requested = this.requested.get();
Iterator it = iterator;
for (;;) {
if (cancelled) {
clear();
} else {
if (outputFused) {
if (it != null) {
downstream.onNext(null);
downstream.onComplete();
}
} else {
if (it != null && emitted != requested) {
R item;
try {
item = it.next();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
downstream.onError(ex);
cancelled = true;
continue;
}
if (cancelled) {
continue;
}
downstream.onNext(item);
emitted++;
if (cancelled) {
continue;
}
boolean has;
try {
has = it.hasNext();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
downstream.onError(ex);
cancelled = true;
continue;
}
if (cancelled) {
continue;
}
if (!has) {
downstream.onComplete();
cancelled = true;
}
continue;
}
}
}
this.emitted = emitted;
missed = addAndGet(-missed);
if (missed == 0) {
return;
}
requested = this.requested.get();
if (it == null) {
it = iterator;
}
}
}
}
}
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