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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.operators.flowable;
import java.util.Objects;
import java.util.concurrent.atomic.*;
import org.reactivestreams.*;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.internal.util.BackpressureHelper;
import io.reactivex.rxjava3.operators.SimplePlainQueue;
import io.reactivex.rxjava3.operators.SpscArrayQueue;
import io.reactivex.rxjava3.plugins.RxJavaPlugins;
public final class FlowableScanSeed extends AbstractFlowableWithUpstream {
final BiFunction accumulator;
final Supplier seedSupplier;
public FlowableScanSeed(Flowable source, Supplier seedSupplier, BiFunction accumulator) {
super(source);
this.accumulator = accumulator;
this.seedSupplier = seedSupplier;
}
@Override
protected void subscribeActual(Subscriber super R> s) {
R r;
try {
r = Objects.requireNonNull(seedSupplier.get(), "The seed supplied is null");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptySubscription.error(e, s);
return;
}
source.subscribe(new ScanSeedSubscriber<>(s, accumulator, r, bufferSize()));
}
static final class ScanSeedSubscriber
extends AtomicInteger
implements FlowableSubscriber, Subscription {
private static final long serialVersionUID = -1776795561228106469L;
final Subscriber super R> downstream;
final BiFunction accumulator;
final SimplePlainQueue queue;
final AtomicLong requested;
final int prefetch;
final int limit;
volatile boolean cancelled;
volatile boolean done;
Throwable error;
Subscription upstream;
R value;
int consumed;
ScanSeedSubscriber(Subscriber super R> actual, BiFunction accumulator, R value, int prefetch) {
this.downstream = actual;
this.accumulator = accumulator;
this.value = value;
this.prefetch = prefetch;
this.limit = prefetch - (prefetch >> 2);
this.queue = new SpscArrayQueue<>(prefetch);
this.queue.offer(value);
this.requested = new AtomicLong();
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
s.request(prefetch - 1);
}
}
@Override
public void onNext(T t) {
if (done) {
return;
}
R v = value;
try {
v = Objects.requireNonNull(accumulator.apply(v, t), "The accumulator returned a null value");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
upstream.cancel();
onError(ex);
return;
}
value = v;
queue.offer(v);
drain();
}
@Override
public void onError(Throwable t) {
if (done) {
RxJavaPlugins.onError(t);
return;
}
error = t;
done = true;
drain();
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
drain();
}
@Override
public void cancel() {
cancelled = true;
upstream.cancel();
if (getAndIncrement() == 0) {
queue.clear();
}
}
@Override
public void request(long n) {
if (SubscriptionHelper.validate(n)) {
BackpressureHelper.add(requested, n);
drain();
}
}
void drain() {
if (getAndIncrement() != 0) {
return;
}
int missed = 1;
Subscriber super R> a = downstream;
SimplePlainQueue q = queue;
int lim = limit;
int c = consumed;
for (;;) {
long r = requested.get();
long e = 0L;
while (e != r) {
if (cancelled) {
q.clear();
return;
}
boolean d = done;
if (d) {
Throwable ex = error;
if (ex != null) {
q.clear();
a.onError(ex);
return;
}
}
R v = q.poll();
boolean empty = v == null;
if (d && empty) {
a.onComplete();
return;
}
if (empty) {
break;
}
a.onNext(v);
e++;
if (++c == lim) {
c = 0;
upstream.request(lim);
}
}
if (e == r) {
if (done) {
Throwable ex = error;
if (ex != null) {
q.clear();
a.onError(ex);
return;
}
if (q.isEmpty()) {
a.onComplete();
return;
}
}
}
if (e != 0L) {
BackpressureHelper.produced(requested, e);
}
consumed = c;
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
}
}
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