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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.Collection;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.function.Supplier;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Exceptions;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;
import static reactor.core.Scannable.Attr.RUN_STYLE;
import static reactor.core.Scannable.Attr.RunStyle.SYNC;
/**
* Buffers elements into custom collections where the buffer boundary is signalled
* by another publisher.
*
* @param the source value type
* @param the element type of the boundary publisher (irrelevant)
* @param the output collection type
*
* @see Reactive-Streams-Commons
*/
final class FluxBufferBoundary>
extends InternalFluxOperator {
final Publisher other;
final Supplier bufferSupplier;
FluxBufferBoundary(Flux extends T> source,
Publisher other,
Supplier bufferSupplier) {
super(source);
this.other = Operators.toFluxOrMono(Objects.requireNonNull(other, "other"));
this.bufferSupplier = Objects.requireNonNull(bufferSupplier, "bufferSupplier");
}
@Override
public int getPrefetch() {
return Integer.MAX_VALUE;
}
@Override
public CoreSubscriber super T> subscribeOrReturn(CoreSubscriber super C> actual) {
C buffer = Objects.requireNonNull(bufferSupplier.get(),
"The bufferSupplier returned a null buffer");
BufferBoundaryMain parent =
new BufferBoundaryMain<>(
source instanceof FluxInterval ?
actual : Operators.serialize(actual),
buffer, bufferSupplier);
actual.onSubscribe(parent);
other.subscribe(parent.other);
return parent;
}
@Override
public Object scanUnsafe(Attr key) {
if (key == RUN_STYLE) return SYNC;
return super.scanUnsafe(key);
}
static final class BufferBoundaryMain>
implements InnerOperator {
final Supplier bufferSupplier;
final CoreSubscriber super C> actual;
final Context ctx;
final BufferBoundaryOther other;
C buffer;
volatile Subscription s;
@SuppressWarnings("rawtypes")
static final AtomicReferenceFieldUpdater S =
AtomicReferenceFieldUpdater.newUpdater(BufferBoundaryMain.class,
Subscription.class,
"s");
volatile long requested;
@SuppressWarnings("rawtypes")
static final AtomicLongFieldUpdater REQUESTED =
AtomicLongFieldUpdater.newUpdater(BufferBoundaryMain.class, "requested");
BufferBoundaryMain(CoreSubscriber super C> actual,
C buffer,
Supplier bufferSupplier) {
this.actual = actual;
this.ctx = actual.currentContext();
this.buffer = buffer;
this.bufferSupplier = bufferSupplier;
this.other = new BufferBoundaryOther<>(this);
}
@Override
public CoreSubscriber super C> actual() {
return actual;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.CANCELLED) return s == Operators.cancelledSubscription();
if (key == Attr.CAPACITY) {
C buffer = this.buffer;
return buffer != null ? buffer.size() : 0;
}
if (key == Attr.PREFETCH) return Integer.MAX_VALUE;
if (key == Attr.REQUESTED_FROM_DOWNSTREAM) return requested;
if (key == RUN_STYLE) return SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
public void request(long n) {
if (Operators.validate(n)) {
Operators.addCap(REQUESTED, this, n);
}
}
@Override
public void cancel() {
Operators.terminate(S, this);
Operators.onDiscardMultiple(buffer, this.ctx);
other.cancel();
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.setOnce(S, this, s)) {
s.request(Long.MAX_VALUE);
}
}
@Override
public void onNext(T t) {
synchronized (this) {
C b = buffer;
if (b != null) {
b.add(t);
return;
}
}
Operators.onNextDropped(t, this.ctx);
}
@Override
public void onError(Throwable t) {
if(Operators.terminate(S, this)) {
C b;
synchronized (this) {
b = buffer;
buffer = null;
}
other.cancel();
actual.onError(t);
Operators.onDiscardMultiple(b, this.ctx);
return;
}
Operators.onErrorDropped(t, this.ctx);
}
@Override
public void onComplete() {
if(Operators.terminate(S, this)) {
C b;
synchronized (this) {
b = buffer;
buffer = null;
}
other.cancel();
if (!b.isEmpty()) {
if (emit(b)) {
actual.onComplete();
} //failed emit will discard buffer's elements
}
else {
actual.onComplete();
}
}
}
void otherComplete() {
Subscription s = S.getAndSet(this, Operators.cancelledSubscription());
if(s != Operators.cancelledSubscription()) {
C b;
synchronized (this) {
b = buffer;
buffer = null;
}
if(s != null){
s.cancel();
}
if (b != null && !b.isEmpty()) {
if (emit(b)) {
actual.onComplete();
} //failed emit will discard buffer content
}
else {
actual.onComplete();
}
}
}
void otherError(Throwable t){
Subscription s = S.getAndSet(this, Operators.cancelledSubscription());
if(s != Operators.cancelledSubscription()) {
C b;
synchronized (this) {
b = buffer;
buffer = null;
}
if(s != null){
s.cancel();
}
actual.onError(t);
Operators.onDiscardMultiple(b, this.ctx);
return;
}
Operators.onErrorDropped(t, this.ctx);
}
void otherNext() {
C c;
try {
c = Objects.requireNonNull(bufferSupplier.get(),
"The bufferSupplier returned a null buffer");
}
catch (Throwable e) {
otherError(Operators.onOperatorError(other, e, this.ctx));
return;
}
C b;
synchronized (this) {
b = buffer;
buffer = c;
}
if (b == null || b.isEmpty()) {
return;
}
emit(b);
}
boolean emit(C b) {
long r = requested;
if (r != 0L) {
actual.onNext(b);
if (r != Long.MAX_VALUE) {
REQUESTED.decrementAndGet(this);
}
return true;
}
else {
actual.onError(Operators.onOperatorError(this, Exceptions
.failWithOverflow(), b, this.ctx));
Operators.onDiscardMultiple(b, this.ctx);
return false;
}
}
}
static final class BufferBoundaryOther extends Operators.DeferredSubscription
implements InnerConsumer {
final BufferBoundaryMain, U, ?> main;
BufferBoundaryOther(BufferBoundaryMain, U, ?> main) {
this.main = main;
}
@Override
public void onSubscribe(Subscription s) {
if (set(s)) {
s.request(Long.MAX_VALUE);
}
}
@Override
public Context currentContext() {
return main.currentContext();
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.ACTUAL) {
return main;
}
if (key == RUN_STYLE) {
return SYNC;
}
return super.scanUnsafe(key);
}
@Override
public void onNext(U t) {
main.otherNext();
}
@Override
public void onError(Throwable t) {
main.otherError(t);
}
@Override
public void onComplete() {
main.otherComplete();
}
}
}
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