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/*
* 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.Objects;
import java.util.function.Function;
import org.reactivestreams.Subscription;
import reactor.core.CorePublisher;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.util.annotation.Nullable;
/**
* Maps the values of the source publisher one-on-one via a mapper function.
*
* This variant allows composing fuseable stages.
*
* @param the source value type
* @param the result value type
*
* @see Reactive-Streams-Commons
*/
final class FluxMapFuseable extends InternalFluxOperator implements Fuseable {
final Function mapper;
/**
* Constructs a FluxMap instance with the given source and mapper.
*
* @param source the source Publisher instance
* @param mapper the mapper function
*
* @throws NullPointerException if either {@code source} or {@code mapper} is null.
*/
FluxMapFuseable(Flux source,
Function mapper) {
super(source);
this.mapper = Objects.requireNonNull(mapper, "mapper");
}
@Override
@SuppressWarnings("unchecked")
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
if (actual instanceof ConditionalSubscriber) {
ConditionalSubscriber cs = (ConditionalSubscriber) actual;
return new MapFuseableConditionalSubscriber<>(cs, mapper);
}
return new MapFuseableSubscriber<>(actual, mapper);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class MapFuseableSubscriber
implements InnerOperator,
QueueSubscription {
final CoreSubscriber actual;
final Function mapper;
boolean done;
QueueSubscription s;
int sourceMode;
MapFuseableSubscriber(CoreSubscriber actual,
Function mapper) {
this.actual = actual;
this.mapper = mapper;
}
@SuppressWarnings("unchecked")
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = (QueueSubscription) s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (sourceMode == ASYNC) {
actual.onNext(null);
}
else {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return;
}
R v;
try {
v = mapper.apply(t);
if (v == null) {
throw new NullPointerException("The mapper [" + mapper.getClass().getName() + "] returned a null value.");
}
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, actual.currentContext(), s);
if (e_ != null) {
onError(e_);
}
else {
s.request(1);
}
return;
}
actual.onNext(v);
}
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
done = true;
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
actual.onComplete();
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
s.cancel();
}
@Override
@Nullable
public R poll() {
for(;;) {
T v = s.poll();
if (v != null) {
try {
return Objects.requireNonNull(mapper.apply(v));
}
catch (Throwable t) {
RuntimeException e_ = Operators.onNextPollError(v, t, currentContext());
if (e_ != null) {
throw e_;
}
else {
continue;
}
}
}
return null;
}
}
@Override
public boolean isEmpty() {
return s.isEmpty();
}
@Override
public void clear() {
s.clear();
}
@Override
public int requestFusion(int requestedMode) {
int m;
if ((requestedMode & Fuseable.THREAD_BARRIER) != 0) {
return Fuseable.NONE;
}
else {
m = s.requestFusion(requestedMode);
}
sourceMode = m;
return m;
}
@Override
public int size() {
return s.size();
}
}
static final class MapFuseableConditionalSubscriber
implements ConditionalSubscriber, InnerOperator,
QueueSubscription {
final ConditionalSubscriber actual;
final Function mapper;
boolean done;
QueueSubscription s;
int sourceMode;
MapFuseableConditionalSubscriber(ConditionalSubscriber actual,
Function mapper) {
this.actual = actual;
this.mapper = mapper;
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return InnerOperator.super.scanUnsafe(key);
}
@SuppressWarnings("unchecked")
@Override
public void onSubscribe(Subscription s) {
if (Operators.validate(this.s, s)) {
this.s = (QueueSubscription) s;
actual.onSubscribe(this);
}
}
@Override
public void onNext(T t) {
if (sourceMode == ASYNC) {
actual.onNext(null);
}
else {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return;
}
R v;
try {
v = mapper.apply(t);
if (v == null) {
throw new NullPointerException("The mapper [" + mapper.getClass().getName() + "] returned a null value.");
}
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, actual.currentContext(), s);
if (e_ != null) {
onError(e_);
}
else {
s.request(1);
}
return;
}
actual.onNext(v);
}
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return true;
}
R v;
try {
v = mapper.apply(t);
if (v == null) {
throw new NullPointerException("The mapper [" + mapper.getClass().getName() + "] returned a null value.");
}
return actual.tryOnNext(v);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, actual.currentContext(), s);
if (e_ != null) {
onError(e_);
return true;
}
else {
return false;
}
}
}
@Override
public void onError(Throwable t) {
if (done) {
Operators.onErrorDropped(t, actual.currentContext());
return;
}
done = true;
actual.onError(t);
}
@Override
public void onComplete() {
if (done) {
return;
}
done = true;
actual.onComplete();
}
@Override
public CoreSubscriber actual() {
return actual;
}
@Override
public void request(long n) {
s.request(n);
}
@Override
public void cancel() {
s.cancel();
}
@Override
@Nullable
public R poll() {
for(;;) {
T v = s.poll();
if (v != null) {
try {
return Objects.requireNonNull(mapper.apply(v));
}
catch (Throwable t) {
RuntimeException e_ = Operators.onNextPollError(v, t, currentContext());
if (e_ != null) {
throw e_;
}
else {
continue;
}
}
}
return null;
}
}
@Override
public boolean isEmpty() {
return s.isEmpty();
}
@Override
public void clear() {
s.clear();
}
@Override
public int requestFusion(int requestedMode) {
int m;
if ((requestedMode & Fuseable.THREAD_BARRIER) != 0) {
return Fuseable.NONE;
}
else {
m = s.requestFusion(requestedMode);
}
sourceMode = m;
return m;
}
@Override
public int size() {
return s.size();
}
}
}