reactor.core.publisher.FluxHandleFuseable Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2017 Pivotal Software Inc, 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
*
* http://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;
/**
* 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 FluxOperator 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
@SuppressWarnings("unchecked")
public void subscribe(CoreSubscriber actual) {
if (actual instanceof ConditionalSubscriber) {
ConditionalSubscriber cs = (ConditionalSubscriber) actual;
source.subscribe(new HandleFuseableConditionalSubscriber<>(cs, handler));
return;
}
source.subscribe(new HandleFuseableSubscriber<>(actual, handler));
}
static final class HandleFuseableSubscriber
implements InnerOperator,
ConditionalSubscriber, QueueSubscription,
SynchronousSink {
final CoreSubscriber actual;
final BiConsumer> handler;
boolean done;
Throwable error;
R data;
QueueSubscription s;
int sourceMode;
HandleFuseableSubscriber(CoreSubscriber actual,
BiConsumer> handler) {
this.actual = actual;
this.handler = handler;
}
@Override
public Context currentContext() {
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) {
onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
return false;
}
R v = data;
data = null;
if (v != null) {
actual.onNext(v);
}
if (done) {
if (error != null) {
actual.onError(Operators.onOperatorError(s, error, t,
actual.currentContext()));
}
else {
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) {
onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
return;
}
R v = data;
data = null;
if (v != null) {
actual.onNext(v);
}
if (done) {
s.cancel();
if (error != null) {
actual.onError(Operators.onOperatorError(null, error, t,
actual.currentContext()));
return;
}
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;
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) {
handler.accept(v, this);
u = data;
data = null;
if (done) {
s.cancel();
if (error != null) {
throw Exceptions.propagate(Operators.onOperatorError
(null, error, v, actual.currentContext()));
}
else {
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) {
handler.accept(v, this);
R u = data;
data = null;
if (done) {
if (error != null) {
throw Exceptions.propagate(Operators.onOperatorError
(null, error, v, actual.currentContext()));
}
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();
}
@Override
public void complete() {
done = true;
}
@Override
public void error(Throwable e) {
error = Objects.requireNonNull(e, "error");
done = true;
}
@Override
public void next(R o) {
if (data != null) {
throw new IllegalStateException("Cannot emit more than one data");
}
data = Objects.requireNonNull(o, "data");
}
}
static final class HandleFuseableConditionalSubscriber
implements ConditionalSubscriber, InnerOperator,
QueueSubscription, SynchronousSink {
final ConditionalSubscriber actual;
final BiConsumer> handler;
boolean done;
Throwable error;
R data;
QueueSubscription s;
int sourceMode;
HandleFuseableConditionalSubscriber(ConditionalSubscriber actual,
BiConsumer> handler) {
this.actual = actual;
this.handler = handler;
}
@Override
public Context currentContext() {
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) {
onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
return;
}
R v = data;
data = null;
if (v != null) {
actual.onNext(v);
}
if (done) {
s.cancel();
if (error != null) {
actual.onError(Operators.onOperatorError(null, error, v,
actual.currentContext()));
return;
}
actual.onComplete();
}
else if (v == null) {
s.request(1L);
}
}
}
@Override
public boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return true;
}
try {
handler.accept(t, this);
}
catch (Throwable e) {
onError(Operators.onOperatorError(s, e, t, actual.currentContext()));
return false;
}
R v = data;
data = null;
boolean emit = false;
if (v != null) {
emit = actual.tryOnNext(v);
}
if (done) {
s.cancel();
if (error != null) {
actual.onError(Operators.onOperatorError(null, error, v,
actual.currentContext()));
}
else {
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() {
done = true;
}
@Override
public void error(Throwable e) {
error = Objects.requireNonNull(e, "error");
done = true;
}
@Override
public void next(R o) {
if (data != null) {
throw new IllegalStateException("Cannot emit more than one data");
}
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;
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) {
handler.accept(v, this);
u = data;
data = null;
if (done) {
s.cancel();
if (error != null) {
throw Exceptions.propagate(Operators.onOperatorError
(null, error, v, actual.currentContext()));
}
else {
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) {
handler.accept(v, this);
R u = data;
data = null;
if (done) {
if (error != null) {
throw Exceptions.propagate(Operators.onOperatorError
(null, error, v, actual.currentContext()));
}
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();
}
}
}