/*
* 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.
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 as long as the handler function result is
* not null. If the result is a {@code null} value then the source value is filtered rather than mapped.
*
* @param <T> the source value type
* @param <R> the result value type
*/
final class
FluxHandle<T, R> extends
FluxOperator<T, R> {
final
BiConsumer<? super T,
SynchronousSink<R>>
handler;
FluxHandle(
Flux<? extends T>
source,
BiConsumer<? super T,
SynchronousSink<R>>
handler) {
super(
source);
this.
handler =
Objects.
requireNonNull(
handler, "handler");
}
@
Override
@
SuppressWarnings("unchecked")
public void
subscribe(
CoreSubscriber<? super R>
actual) {
if (
actual instanceof
Fuseable.
ConditionalSubscriber) {
Fuseable.
ConditionalSubscriber<? super R>
cs = (
Fuseable.
ConditionalSubscriber<? super R>)
actual;
source.
subscribe(new
HandleConditionalSubscriber<>(
cs,
handler));
return;
}
source.
subscribe(new
HandleSubscriber<>(
actual,
handler));
}
static final class
HandleSubscriber<T, R>
implements
InnerOperator<T, R>,
Fuseable.
ConditionalSubscriber<T>,
SynchronousSink<R> {
final
CoreSubscriber<? super R>
actual;
final
BiConsumer<? super T,
SynchronousSink<R>>
handler;
boolean
done;
boolean
stop;
Throwable error;
R
data;
Subscription s;
HandleSubscriber(
CoreSubscriber<? super R>
actual,
BiConsumer<? super T,
SynchronousSink<R>>
handler) {
this.
actual =
actual;
this.
handler =
handler;
}
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s =
s;
actual.
onSubscribe(this);
}
}
@
Override
public
Context currentContext() {
return
actual.
currentContext();
}
@
Override
public void
onNext(T
t) {
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) {
onError(
e_);
}
else {
reset();
s.
request(1L);
}
}
else {
s.
cancel();
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 false;
}
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) {
onError(
e_);
}
else {
reset();
return false;
}
}
else {
s.
cancel();
onComplete();
}
return true;
}
return
v != null;
}
@
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;
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();
}
}
static final class
HandleConditionalSubscriber<T, R>
implements
Fuseable.
ConditionalSubscriber<T>,
InnerOperator<T, R>,
SynchronousSink<R> {
final
Fuseable.
ConditionalSubscriber<? super R>
actual;
final
BiConsumer<? super T,
SynchronousSink<R>>
handler;
boolean
done;
boolean
stop;
Throwable error;
R
data;
Subscription s;
HandleConditionalSubscriber(
Fuseable.
ConditionalSubscriber<? super R>
actual,
BiConsumer<? super T,
SynchronousSink<R>>
handler) {
this.
actual =
actual;
this.
handler =
handler;
}
@
Override
public
Context currentContext() {
return
actual.
currentContext();
}
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s =
s;
actual.
onSubscribe(this);
}
}
@
Override
public void
onNext(T
t) {
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 {
error = null;
s.
request(1);
}
return;
}
R
v =
data;
data = null;
if (
v != null) {
actual.
onNext(
v);
}
if(
stop){
done = true; //set done because we go through `actual` directly
if(
error != null){
Throwable e_ =
Operators.
onNextError(
t,
error,
actual.
currentContext(),
s);
if (
e_ != null) {
actual.
onError(
e_);
}
else {
reset(); //resets done
s.
request(1L);
}
}
else {
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 false;
}
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;
boolean
emit = false;
data = null;
if (
v != null) {
emit =
actual.
tryOnNext(
v);
}
if(
stop){
done = true; //set done because we go through `actual` directly
if(
error != null){
Throwable e_ =
Operators.
onNextError(
t,
error,
actual.
currentContext(),
s);
if (
e_ != null) {
actual.
onError(
e_);
}
else {
reset(); //resets done
return false;
}
}
else {
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
CoreSubscriber<? super R>
actual() {
return
actual;
}
@
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
public void
request(long
n) {
s.
request(
n);
}
@
Override
public void
cancel() {
s.
cancel();
}
@
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);
}
}
}