/*
* 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.
Function;
import org.reactivestreams.
Subscription;
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.
* <p>
* This variant allows composing fuseable stages.
*
* @param <T> the source value type
* @param <R> the result value type
*
* @see <a href="https://github.com/reactor/reactive-streams-commons">Reactive-Streams-Commons</a>
*/
final class
FluxMapFuseable<T, R> extends
FluxOperator<T, R> implements
Fuseable {
final
Function<? super T, ? extends R>
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<? extends T>
source,
Function<? super T, ? extends R>
mapper) {
super(
source);
this.
mapper =
Objects.
requireNonNull(
mapper, "mapper");
}
@
Override
@
SuppressWarnings("unchecked")
public void
subscribe(
CoreSubscriber<? super R>
actual) {
if (
actual instanceof
ConditionalSubscriber) {
ConditionalSubscriber<? super R>
cs = (
ConditionalSubscriber<? super R>)
actual;
source.
subscribe(new
MapFuseableConditionalSubscriber<>(
cs,
mapper));
return;
}
source.
subscribe(new
MapFuseableSubscriber<>(
actual,
mapper));
}
static final class
MapFuseableSubscriber<T, R>
implements
InnerOperator<T, R>,
QueueSubscription<R> {
final
CoreSubscriber<? super R>
actual;
final
Function<? super T, ? extends R>
mapper;
boolean
done;
QueueSubscription<T>
s;
int
sourceMode;
MapFuseableSubscriber(
CoreSubscriber<? super R>
actual,
Function<? super T, ? extends R>
mapper) {
this.
actual =
actual;
this.
mapper =
mapper;
}
@
SuppressWarnings("unchecked")
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s = (
QueueSubscription<T>)
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 =
Objects.
requireNonNull(
mapper.
apply(
t),
"The mapper 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;
return
InnerOperator.super.scanUnsafe(
key);
}
@
Override
public
CoreSubscriber<? super R>
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<T, R>
implements
ConditionalSubscriber<T>,
InnerOperator<T, R>,
QueueSubscription<R> {
final
ConditionalSubscriber<? super R>
actual;
final
Function<? super T, ? extends R>
mapper;
boolean
done;
QueueSubscription<T>
s;
int
sourceMode;
MapFuseableConditionalSubscriber(
ConditionalSubscriber<? super R>
actual,
Function<? super T, ? extends R>
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;
return
InnerOperator.super.scanUnsafe(
key);
}
@
SuppressWarnings("unchecked")
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s = (
QueueSubscription<T>)
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 =
Objects.
requireNonNull(
mapper.
apply(
t),
"The mapper 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 =
Objects.
requireNonNull(
mapper.
apply(
t),
"The mapper 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<? super R>
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();
}
}
}