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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) 2016-2022 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.AbstractQueue;
import java.util.Iterator;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import java.util.function.BooleanSupplier;
import java.util.function.Function;
import java.util.function.Supplier;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.util.annotation.Nullable;
/**
* Maps the values of the source publisher one-on-one via a mapper function.
*
* @param the source value type
* @param the result value type
* @author Stephane Maldini
*/
final class FluxMapSignal extends InternalFluxOperator {
final Function mapperNext;
final Function mapperError;
final Supplier mapperComplete;
/**
* Constructs a FluxMapSignal instance with the given source and mappers.
*
* @param source the source Publisher instance
* @param mapperNext the next mapper function
* @param mapperError the error mapper function
* @param mapperComplete the complete mapper function
*
* @throws NullPointerException if either {@code source} is null or all {@code mapper} are null.
*/
FluxMapSignal(Flux source,
@Nullable Function mapperNext,
@Nullable Function mapperError,
@Nullable Supplier mapperComplete) {
super(source);
if(mapperNext == null && mapperError == null && mapperComplete == null){
throw new IllegalArgumentException("Map Signal needs at least one valid mapper");
}
this.mapperNext = mapperNext;
this.mapperError = mapperError;
this.mapperComplete = mapperComplete;
}
@Override
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
return new FluxMapSignalSubscriber<>(actual,
mapperNext,
mapperError,
mapperComplete);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class FluxMapSignalSubscriber
extends AbstractQueue
implements InnerOperator,
BooleanSupplier {
final CoreSubscriber actual;
final Function mapperNext;
final Function mapperError;
final Supplier mapperComplete;
boolean done;
Subscription s;
R value;
volatile long requested;
@SuppressWarnings("rawtypes")
static final AtomicLongFieldUpdater REQUESTED =
AtomicLongFieldUpdater.newUpdater(FluxMapSignalSubscriber.class, "requested");
volatile boolean cancelled;
long produced;
FluxMapSignalSubscriber(CoreSubscriber actual,
@Nullable Function mapperNext,
@Nullable Function mapperError,
@Nullable Supplier mapperComplete) {
this.actual = actual;
this.mapperNext = mapperNext;
this.mapperError = mapperError;
this.mapperComplete = mapperComplete;
}
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = s;
actual.onSubscribe(this);
if (mapperNext == null) {
s.request(Long.MAX_VALUE);
}
}
}
@Override
public void onNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return;
}
if (mapperNext == null) {
return;
}
R v;
try {
v = mapperNext.apply(t);
if (v == null) {
throw new NullPointerException("The mapper [" + mapperNext.getClass().getName() + "] returned a null value.");
}
}
catch (Throwable e) {
done = true;
actual.onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
return;
}
produced++;
actual.onNext(v);
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
done = true;
if(mapperError == null){
actual.onError(t);
return;
}
R v;
try {
v = mapperError.apply(t);
if (v == null) {
throw new NullPointerException("The mapper [" + mapperError.getClass().getName() + "] returned a null value.");
}
}
catch (Throwable e) {
done = true;
actual.onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
return;
}
value = v;
long p = produced;
if (p != 0L) {
Operators.addCap(REQUESTED, this, -p);
}
DrainUtils.postComplete(actual, this, REQUESTED, this, this);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
if(mapperComplete == null){
actual.onComplete();
return;
}
R v;
try {
v = mapperComplete.get();
if (v == null) {
throw new NullPointerException("The mapper [" + mapperComplete.getClass().getName() + "] returned a null value.");
}
}
catch (Throwable e) {
done = true;
actual.onError(Operators.onOperatorError(s, e, actual.currentContext()));
return;
}
value = v;
long p = produced;
if (p != 0L) {
Operators.addCap(REQUESTED, this, -p);
}
DrainUtils.postComplete(actual, this, REQUESTED, this, this);
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
if (Operators.validate(n)) {
if (!DrainUtils.postCompleteRequest(n, actual, this, REQUESTED, this, this)) {
s.request(n);
}
}
}
@Override
public boolean offer(R e) {
throw new UnsupportedOperationException();
}
@Override
@Nullable
public R poll() {
R v = value;
if (v != null) {
value = null;
return v;
}
return null;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.CANCELLED) return getAsBoolean();
if (key == Attr.REQUESTED_FROM_DOWNSTREAM) return requested;
if (key == Attr.BUFFERED) return size();
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
@Nullable
public R peek() {
return value;
}
@Override
public boolean getAsBoolean() {
return cancelled;
}
@Override
public void cancel() {
cancelled = true;
s.cancel();
}
@Override
public Iterator iterator() {
throw new UnsupportedOperationException();
}
@Override
public int size() {
return value == null ? 0 : 1;
}
}
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