reactor.core.publisher.FluxBuffer Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of redisson-all Show documentation
Show all versions of redisson-all Show documentation
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) 2016-2021 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.ArrayDeque;
import java.util.Collection;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import java.util.function.BooleanSupplier;
import java.util.function.Supplier;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;
/**
* Buffers a certain number of subsequent elements and emits the buffers.
*
* @param the source value type
* @param the buffer collection type
*
* @see Reactive-Streams-Commons
*/
final class FluxBuffer> extends InternalFluxOperator {
final int size;
final int skip;
final Supplier bufferSupplier;
FluxBuffer(Flux source, int size, Supplier bufferSupplier) {
this(source, size, size, bufferSupplier);
}
FluxBuffer(Flux source,
int size,
int skip,
Supplier bufferSupplier) {
super(source);
if (size <= 0) {
throw new IllegalArgumentException("size > 0 required but it was " + size);
}
if (skip <= 0) {
throw new IllegalArgumentException("skip > 0 required but it was " + skip);
}
this.size = size;
this.skip = skip;
this.bufferSupplier = Objects.requireNonNull(bufferSupplier, "bufferSupplier");
}
@Override
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
if (size == skip) {
return new BufferExactSubscriber<>(actual, size, bufferSupplier);
}
else if (skip > size) {
return new BufferSkipSubscriber<>(actual, size, skip, bufferSupplier);
}
else {
return new BufferOverlappingSubscriber<>(actual, size, skip, bufferSupplier);
}
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class BufferExactSubscriber>
implements InnerOperator {
final CoreSubscriber actual;
final Supplier bufferSupplier;
final int size;
C buffer;
Subscription s;
boolean done;
BufferExactSubscriber(CoreSubscriber actual,
int size,
Supplier bufferSupplier) {
this.actual = actual;
this.size = size;
this.bufferSupplier = bufferSupplier;
}
@Override
public void request(long n) {
if (Operators.validate(n)) {
s.request(Operators.multiplyCap(n, size));
}
}
@Override
public void cancel() {
s.cancel();
Operators.onDiscardMultiple(buffer, actual.currentContext());
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return;
}
C b = buffer;
if (b == null) {
try {
b = Objects.requireNonNull(bufferSupplier.get(),
"The bufferSupplier returned a null buffer");
}
catch (Throwable e) {
Context ctx = actual.currentContext();
onError(Operators.onOperatorError(s, e, t, ctx));
Operators.onDiscard(t, ctx); //this is in no buffer
return;
}
buffer = b;
}
b.add(t);
if (b.size() == size) {
buffer = null;
actual.onNext(b);
}
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
done = true;
actual.onError(t);
Operators.onDiscardMultiple(buffer, actual.currentContext());
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
C b = buffer;
if (b != null && !b.isEmpty()) {
actual.onNext(b);
}
actual.onComplete();
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.BUFFERED) {
C b = buffer;
return b != null ? b.size() : 0;
}
if (key == Attr.CAPACITY) return size;
if (key == Attr.PREFETCH) return size;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
}
static final class BufferSkipSubscriber>
implements InnerOperator {
final CoreSubscriber actual;
final Context ctx;
final Supplier bufferSupplier;
final int size;
final int skip;
C buffer;
Subscription s;
boolean done;
long index;
volatile int wip;
@SuppressWarnings("rawtypes")
static final AtomicIntegerFieldUpdater WIP =
AtomicIntegerFieldUpdater.newUpdater(BufferSkipSubscriber.class, "wip");
BufferSkipSubscriber(CoreSubscriber actual,
int size,
int skip,
Supplier bufferSupplier) {
this.actual = actual;
this.ctx = actual.currentContext();
this.size = size;
this.skip = skip;
this.bufferSupplier = bufferSupplier;
}
@Override
public void request(long n) {
if (!Operators.validate(n)) {
return;
}
if (wip == 0 && WIP.compareAndSet(this, 0, 1)) {
// n full buffers
long u = Operators.multiplyCap(n, size);
// + (n - 1) gaps
long v = Operators.multiplyCap(skip - size, n - 1);
s.request(Operators.addCap(u, v));
}
else {
// n full buffer + gap
s.request(Operators.multiplyCap(skip, n));
}
}
@Override
public void cancel() {
s.cancel();
Operators.onDiscardMultiple(buffer, this.ctx);
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (done) {
Operators.onNextDropped(t, this.ctx);
return;
}
C b = buffer;
long i = index;
if (i % skip == 0L) {
try {
b = Objects.requireNonNull(bufferSupplier.get(),
"The bufferSupplier returned a null buffer");
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, this.ctx));
Operators.onDiscard(t, this.ctx); //t hasn't got a chance to end up in any buffer
return;
}
buffer = b;
}
if (b != null) {
b.add(t);
if (b.size() == size) {
buffer = null;
actual.onNext(b);
}
}
else {
//dropping
Operators.onDiscard(t, this.ctx);
}
index = i + 1;
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, this.ctx);
return;
}
done = true;
C b = buffer;
buffer = null;
actual.onError(t);
Operators.onDiscardMultiple(b, this.ctx);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
C b = buffer;
buffer = null;
if (b != null) {
actual.onNext(b);
}
actual.onComplete();
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.CAPACITY) return size;
if (key == Attr.BUFFERED) {
C b = buffer;
return b != null ? b.size() : 0;
}
if (key == Attr.PREFETCH) return size;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
}
static final class BufferOverlappingSubscriber>
extends ArrayDeque
implements BooleanSupplier, InnerOperator {
final CoreSubscriber actual;
final Supplier bufferSupplier;
final int size;
final int skip;
Subscription s;
boolean done;
long index;
volatile boolean cancelled;
long produced;
volatile int once;
@SuppressWarnings("rawtypes")
static final AtomicIntegerFieldUpdater ONCE =
AtomicIntegerFieldUpdater.newUpdater(BufferOverlappingSubscriber.class,
"once");
volatile long requested;
@SuppressWarnings("rawtypes")
static final AtomicLongFieldUpdater REQUESTED =
AtomicLongFieldUpdater.newUpdater(BufferOverlappingSubscriber.class,
"requested");
BufferOverlappingSubscriber(CoreSubscriber actual,
int size,
int skip,
Supplier bufferSupplier) {
this.actual = actual;
this.size = size;
this.skip = skip;
this.bufferSupplier = bufferSupplier;
}
@Override
public boolean getAsBoolean() {
return cancelled;
}
@Override
public void request(long n) {
if (!Operators.validate(n)) {
return;
}
if (DrainUtils.postCompleteRequest(n,
actual,
this,
REQUESTED,
this,
this)) {
return;
}
if (once == 0 && ONCE.compareAndSet(this, 0, 1)) {
// (n - 1) skips
long u = Operators.multiplyCap(skip, n - 1);
// + 1 full buffer
long r = Operators.addCap(size, u);
s.request(r);
}
else {
// n skips
long r = Operators.multiplyCap(skip, n);
s.request(r);
}
}
@Override
public void cancel() {
cancelled = true;
s.cancel();
clear();
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return;
}
long i = index;
if (i % skip == 0L) {
C b;
try {
b = Objects.requireNonNull(bufferSupplier.get(),
"The bufferSupplier returned a null buffer");
}
catch (Throwable e) {
Context ctx = actual.currentContext();
onError(Operators.onOperatorError(s, e, t, ctx));
Operators.onDiscard(t, ctx); //didn't get a chance to be added to a buffer
return;
}
offer(b);
}
C b = peek();
if (b != null && b.size() + 1 == size) {
poll();
b.add(t);
actual.onNext(b);
produced++;
}
for (C b0 : this) {
b0.add(t);
}
index = i + 1;
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
done = true;
clear();
actual.onError(t);
}
@Override
public void clear() {
Context ctx = actual.currentContext();
for(C b: this) {
Operators.onDiscardMultiple(b, ctx);
}
super.clear();
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
long p = produced;
if (p != 0L) {
Operators.produced(REQUESTED,this, p);
}
DrainUtils.postComplete(actual, this, REQUESTED, this, this);
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.CANCELLED) return cancelled;
if (key == Attr.CAPACITY) return size() * size;
if (key == Attr.BUFFERED) return stream().mapToInt(Collection::size).sum();
if (key == Attr.PREFETCH) return Integer.MAX_VALUE;
if (key == Attr.REQUESTED_FROM_DOWNSTREAM) return requested;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy