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/*
* 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.Objects;
import java.util.function.BiConsumer;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Exceptions;
import reactor.core.Fuseable;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;
import reactor.util.context.ContextView;
/**
* Maps the values of the source publisher one-on-one via a handler function.
*
* This variant allows composing fuseable stages.
*
* @param the source value type
* @param the result value type
*
* @see Reactive-Streams-Commons
*/
final class FluxHandleFuseable extends InternalFluxOperator implements Fuseable {
final BiConsumer> handler;
/**
* Constructs a FluxMap instance with the given source and handler.
*
* @param source the source Publisher instance
* @param handler the handler function
*
* @throws NullPointerException if either {@code source} or {@code handler} is null.
*/
FluxHandleFuseable(Flux source,
BiConsumer> handler) {
super(source);
this.handler = Objects.requireNonNull(handler, "handler");
}
@Override
public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
BiConsumer> handler2 = ContextPropagationSupport.shouldRestoreThreadLocalsInSomeOperators() ?
ContextPropagation.contextRestoreForHandle(this.handler, actual::currentContext) : this.handler;
if (actual instanceof ConditionalSubscriber) {
@SuppressWarnings("unchecked")
ConditionalSubscriber cs = (ConditionalSubscriber) actual;
return new HandleFuseableConditionalSubscriber<>(cs, handler2);
}
return new HandleFuseableSubscriber<>(actual, handler2);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class HandleFuseableSubscriber
implements InnerOperator,
ConditionalSubscriber, QueueSubscription,
SynchronousSink {
final CoreSubscriber actual;
final BiConsumer> handler;
boolean done;
boolean stop;
Throwable error;
R data;
QueueSubscription s;
int sourceMode;
HandleFuseableSubscriber(CoreSubscriber actual,
BiConsumer> handler) {
this.actual = actual;
this.handler = handler;
}
@Override
@Deprecated
public Context currentContext() {
return actual.currentContext();
}
@Override
public ContextView contextView() {
return actual.currentContext();
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return true;
}
try {
handler.accept(t, this);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, actual.currentContext(), s);
if (e_ != null) {
onError(e_);
return true;
}
else {
reset();
return false;
}
}
R v = data;
data = null;
if (v != null) {
actual.onNext(v);
}
if (stop) {
if (error != null) {
Throwable e_ = Operators.onNextError(t, error, actual.currentContext(), s);
if (e_ != null) {
done = true; //set done because we throw or go through `actual` directly
actual.onError(e_);
}
else {
reset();
return false;
}
}
else {
done = true; //set done because we throw or go through `actual` directly
s.cancel();
actual.onComplete();
}
return true;
}
return v != null;
}
@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;
}
try {
handler.accept(t, this);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, actual.currentContext(), s);
if (e_ != null) {
onError(e_);
}
else {
s.request(1);
}
return;
}
R v = data;
data = null;
if (v != null) {
actual.onNext(v);
}
if (stop) {
if (error != null) {
Throwable e_ = Operators.onNextError(t, error, actual.currentContext(), s);
if (e_ != null) {
done = true; //set done because we throw or go through `actual` directly
actual.onError(e_);
}
else {
reset();
s.request(1L);
}
}
else{
done = true; //set done because we throw or go through `actual` directly
s.cancel();
actual.onComplete();
}
}
else if (v == null) {
s.request(1L);
}
}
}
@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
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.ERROR) return error;
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() {
if (sourceMode == ASYNC) {
if (done) {
return null;
}
long dropped = 0L;
for (; ; ) {
T v = s.poll();
R u;
if (v != null) {
try {
handler.accept(v, this);
}
catch (Throwable error){
RuntimeException e_ = Operators.onNextPollError(v, error, actual.currentContext());
if (e_ != null) {
throw e_;
}
else {
reset();
continue;
}
}
u = data;
data = null;
if (stop) {
if (error != null) {
RuntimeException e_ = Operators.onNextPollError(v, error, actual.currentContext());
if (e_ != null) {
done = true; //set done because we throw or go through `actual` directly
throw e_;
}
//else continue
}
else {
done = true; //set done because we throw or go through `actual` directly
s.cancel();
actual.onComplete();
}
return u;
}
if (u != null) {
return u;
}
dropped++;
}
else if (dropped != 0L) {
request(dropped);
dropped = 0L;
}
else {
return null;
}
}
}
else {
for (; ; ) {
T v = s.poll();
if (v != null) {
try {
handler.accept(v, this);
}
catch (Throwable error){
RuntimeException e_ = Operators.onNextPollError(v, error, actual.currentContext());
if (e_ != null) {
throw e_;
}
else {
reset();
continue;
}
}
R u = data;
data = null;
if (stop) {
if (error != null) {
RuntimeException e_ = Operators.onNextPollError(v, error, actual.currentContext());
if (e_ != null) {
done = true; //set done because we throw or go through `actual` directly
throw e_;
}
else {
reset();
continue;
}
}
else {
done = true; //set done because we throw or go through `actual` directly
return u;
}
}
if (u != null) {
return u;
}
}
else {
return null;
}
}
}
}
private void reset() {
done = false;
stop = false;
error = 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();
}
@Override
public void complete() {
if (stop) {
throw new IllegalStateException("Cannot complete after a complete or error");
}
stop = true;
}
@Override
public void error(Throwable e) {
if (stop) {
throw new IllegalStateException("Cannot error after a complete or error");
}
error = Objects.requireNonNull(e, "error");
stop = true;
}
@Override
public void next(R o) {
if (data != null) {
throw new IllegalStateException("Cannot emit more than one data");
}
if (stop) {
throw new IllegalStateException("Cannot emit after a complete or error");
}
data = Objects.requireNonNull(o, "data");
}
}
static final class HandleFuseableConditionalSubscriber
implements ConditionalSubscriber, InnerOperator,
QueueSubscription, SynchronousSink {
final ConditionalSubscriber actual;
final BiConsumer> handler;
boolean done;
boolean stop;
Throwable error;
R data;
QueueSubscription s;
int sourceMode;
HandleFuseableConditionalSubscriber(ConditionalSubscriber actual,
BiConsumer> handler) {
this.actual = actual;
this.handler = handler;
}
@Override
@Deprecated
public Context currentContext() {
return actual.currentContext();
}
@Override
public ContextView contextView() {
return actual.currentContext();
}
@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;
}
try {
handler.accept(t, this);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, e, actual.currentContext(), s);
if (e_ != null) {
onError(e_);
}
else {
reset();
s.request(1);
}
return;
}
R v = data;
data = null;
if (v != null) {
actual.onNext(v);
}
if (stop) {
if (error != null) {
Throwable e_ = Operators.onNextError(t, error, actual.currentContext(), s);
if (e_ != null) {
done = true; //set done because we throw or go through `actual` directly
actual.onError(e_);
}
else {
reset();
s.request(1L);
}
}
else {
done = true; //set done because we throw or go through `actual` directly
s.cancel();
actual.onComplete();
}
}
else if (v == null) {
s.request(1L);
}
}
}
private void reset() {
done = false;
stop = false;
error = null;
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return true;
}
try {
handler.accept(t, this);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(t, error, actual.currentContext(), s);
if (e_ != null) {
onError(e_);
return true;
}
else {
reset();
return false;
}
}
R v = data;
data = null;
boolean emit = false;
if (v != null) {
emit = actual.tryOnNext(v);
}
if (stop) {
if (error != null) {
Throwable e_ = Operators.onNextError(t, error, actual.currentContext(), s);
if (e_ != null) {
done = true; //set done because we throw or go through `actual` directly
actual.onError(e_);
}
else {
reset();
return false;
}
}
else {
done = true; //set done because we throw or go through `actual` directly
s.cancel();
actual.onComplete();
}
return true;
}
return emit;
}
@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 void complete() {
if (stop) {
throw new IllegalStateException("Cannot complete after a complete or error");
}
stop = true;
}
@Override
public void error(Throwable e) {
if (stop) {
throw new IllegalStateException("Cannot error after a complete or error");
}
error = Objects.requireNonNull(e, "error");
stop = true;
}
@Override
public void next(R o) {
if (data != null) {
throw new IllegalStateException("Cannot emit more than one data");
}
if (stop) {
throw new IllegalStateException("Cannot emit after a complete or error");
}
data = Objects.requireNonNull(o, "data");
}
@Override
@Nullable
public Object scanUnsafe(Attr key) {
if (key == Attr.PARENT) return s;
if (key == Attr.TERMINATED) return done;
if (key == Attr.ERROR) return error;
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() {
if (sourceMode == ASYNC) {
if (done) {
return null;
}
long dropped = 0L;
for (; ; ) {
T v = s.poll();
R u;
if (v != null) {
try {
handler.accept(v, this);
}
catch (Throwable error){
RuntimeException e_ = Operators.onNextPollError(v, error, actual.currentContext());
if (e_ != null) {
throw e_;
}
else {
reset();
continue;
}
}
u = data;
data = null;
if (stop) {
if (error != null) {
Throwable e_ = Operators.onNextError(v, error, actual.currentContext(), s);
if (e_ != null) {
done = true; //set done because we throw or go through `actual` directly
throw Exceptions.propagate(e_);
}
else {
reset();
continue;
}
}
else {
done = true; //set done because we throw or go through `actual` directly
s.cancel();
actual.onComplete();
}
return u;
}
if (u != null) {
return u;
}
dropped++;
}
else if (dropped != 0L) {
request(dropped);
dropped = 0L;
}
else {
return null;
}
}
}
else {
for (; ; ) {
T v = s.poll();
if (v != null) {
try {
handler.accept(v, this);
}
catch (Throwable error){
RuntimeException e_ = Operators.onNextPollError(v, error, actual.currentContext());
if (e_ != null) {
throw e_;
}
else {
reset();
continue;
}
}
R u = data;
data = null;
if (stop) {
done = true; //set done because we throw or go through `actual` directly
if (error != null) {
RuntimeException e_ = Operators.onNextPollError(v, error, actual.currentContext());
if (e_ != null) {
throw e_;
}
else{
reset();
continue;
}
}
return u;
}
if (u != null) {
return u;
}
}
else {
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();
}
}
}