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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.concurrent.atomic.AtomicLong;
import org.reactivestreams.*;
import io.reactivex.rxjava3.annotations.Nullable;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.exceptions.*;
import io.reactivex.rxjava3.functions.*;
import io.reactivex.rxjava3.internal.subscriptions.*;
import io.reactivex.rxjava3.internal.util.BackpressureHelper;
import io.reactivex.rxjava3.operators.*;
public final class FlowableOnBackpressureBuffer extends AbstractFlowableWithUpstream {
final int bufferSize;
final boolean unbounded;
final boolean delayError;
final Action onOverflow;
final Consumer onDropped;
public FlowableOnBackpressureBuffer(Flowable source, int bufferSize, boolean unbounded,
boolean delayError, Action onOverflow, Consumer onDropped) {
super(source);
this.bufferSize = bufferSize;
this.unbounded = unbounded;
this.delayError = delayError;
this.onOverflow = onOverflow;
this.onDropped = onDropped;
}
@Override
protected void subscribeActual(Subscriber s) {
source.subscribe(new BackpressureBufferSubscriber<>(s, bufferSize, unbounded, delayError, onOverflow, onDropped));
}
static final class BackpressureBufferSubscriber extends BasicIntQueueSubscription implements FlowableSubscriber {
private static final long serialVersionUID = -2514538129242366402L;
final Subscriber downstream;
final SimplePlainQueue queue;
final boolean delayError;
final Action onOverflow;
final Consumer onDropped;
Subscription upstream;
volatile boolean cancelled;
volatile boolean done;
Throwable error;
final AtomicLong requested = new AtomicLong();
boolean outputFused;
BackpressureBufferSubscriber(Subscriber actual, int bufferSize,
boolean unbounded, boolean delayError, Action onOverflow, Consumer onDropped) {
this.downstream = actual;
this.onOverflow = onOverflow;
this.delayError = delayError;
this.onDropped = onDropped;
SimplePlainQueue q;
if (unbounded) {
q = new SpscLinkedArrayQueue<>(bufferSize);
} else {
q = new SpscArrayQueue<>(bufferSize);
}
this.queue = q;
}
@Override
public void onSubscribe(Subscription s) {
if (SubscriptionHelper.validate(this.upstream, s)) {
this.upstream = s;
downstream.onSubscribe(this);
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
if (!queue.offer(t)) {
upstream.cancel();
MissingBackpressureException ex = new MissingBackpressureException("Buffer is full");
try {
onOverflow.run();
onDropped.accept(t);
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
ex.initCause(e);
}
onError(ex);
return;
}
if (outputFused) {
downstream.onNext(null);
} else {
drain();
}
}
@Override
public void onError(Throwable t) {
error = t;
done = true;
if (outputFused) {
downstream.onError(t);
} else {
drain();
}
}
@Override
public void onComplete() {
done = true;
if (outputFused) {
downstream.onComplete();
} else {
drain();
}
}
@Override
public void request(long n) {
if (!outputFused) {
if (SubscriptionHelper.validate(n)) {
BackpressureHelper.add(requested, n);
drain();
}
}
}
@Override
public void cancel() {
if (!cancelled) {
cancelled = true;
upstream.cancel();
if (!outputFused && getAndIncrement() == 0) {
queue.clear();
}
}
}
void drain() {
if (getAndIncrement() == 0) {
int missed = 1;
final SimplePlainQueue q = queue;
final Subscriber a = downstream;
for (;;) {
if (checkTerminated(done, q.isEmpty(), a)) {
return;
}
long r = requested.get();
long e = 0L;
while (e != r) {
boolean d = done;
T v = q.poll();
boolean empty = v == null;
if (checkTerminated(d, empty, a)) {
return;
}
if (empty) {
break;
}
a.onNext(v);
e++;
}
if (e == r) {
boolean d = done;
boolean empty = q.isEmpty();
if (checkTerminated(d, empty, a)) {
return;
}
}
if (e != 0L) {
if (r != Long.MAX_VALUE) {
requested.addAndGet(-e);
}
}
missed = addAndGet(-missed);
if (missed == 0) {
break;
}
}
}
}
boolean checkTerminated(boolean d, boolean empty, Subscriber a) {
if (cancelled) {
queue.clear();
return true;
}
if (d) {
if (delayError) {
if (empty) {
Throwable e = error;
if (e != null) {
a.onError(e);
} else {
a.onComplete();
}
return true;
}
} else {
Throwable e = error;
if (e != null) {
queue.clear();
a.onError(e);
return true;
} else
if (empty) {
a.onComplete();
return true;
}
}
}
return false;
}
@Override
public int requestFusion(int mode) {
if ((mode & ASYNC) != 0) {
outputFused = true;
return ASYNC;
}
return NONE;
}
@Nullable
@Override
public T poll() {
return queue.poll();
}
@Override
public void clear() {
queue.clear();
}
@Override
public boolean isEmpty() {
return queue.isEmpty();
}
}
}
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