/*
* 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.
Consumer;
import org.reactivestreams.
Subscription;
import reactor.core.
CoreSubscriber;
import reactor.core.
Exceptions;
import reactor.core.
Fuseable;
import reactor.core.
Fuseable.
ConditionalSubscriber;
import reactor.util.annotation.
Nullable;
import reactor.util.context.
Context;
/**
* Peek into the lifecycle events and signals of a sequence
*
* @param <T> the value type
*
* @see <a href="https://github.com/reactor/reactive-streams-commons">Reactive-Streams-Commons</a>
*/
final class
FluxDoOnEach<T> extends
FluxOperator<T, T> {
final
Consumer<? super
Signal<T>>
onSignal;
FluxDoOnEach(
Flux<? extends T>
source,
Consumer<? super
Signal<T>>
onSignal) {
super(
source);
this.
onSignal =
Objects.
requireNonNull(
onSignal, "onSignal");
}
@
SuppressWarnings("unchecked")
static <T>
DoOnEachSubscriber<T>
createSubscriber(
CoreSubscriber<? super T>
actual,
Consumer<? super
Signal<T>>
onSignal, boolean
fuseable) {
if (
fuseable) {
if(
actual instanceof
ConditionalSubscriber) {
return new
DoOnEachFuseableConditionalSubscriber<>((
ConditionalSubscriber<? super T>)
actual,
onSignal);
}
return new
DoOnEachFuseableSubscriber<>(
actual,
onSignal);
}
if (
actual instanceof
ConditionalSubscriber) {
return new
DoOnEachConditionalSubscriber<>((
ConditionalSubscriber<? super T>)
actual,
onSignal);
}
return new
DoOnEachSubscriber<>(
actual,
onSignal);
}
@
Override
public void
subscribe(
CoreSubscriber<? super T>
actual) {
source.
subscribe(
createSubscriber(
actual,
onSignal, false));
}
static class
DoOnEachSubscriber<T> implements
InnerOperator<T, T>,
Signal<T> {
final
CoreSubscriber<? super T>
actual;
final
Context cachedContext;
final
Consumer<? super
Signal<T>>
onSignal;
T
t;
Subscription s;
@
Nullable
Fuseable.
QueueSubscription<T>
qs;
boolean
done;
DoOnEachSubscriber(
CoreSubscriber<? super T>
actual,
Consumer<? super
Signal<T>>
onSignal) {
this.
actual =
actual;
this.
cachedContext =
actual.
currentContext();
this.
onSignal =
onSignal;
}
@
Override
public void
request(long
n) {
s.
request(
n);
}
@
Override
public void
cancel() {
s.
cancel();
}
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s =
s;
this.
qs =
Operators.
as(
s);
actual.
onSubscribe(this);
}
}
@
Override
public
Context currentContext() {
return
cachedContext;
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
PARENT) {
return
s;
}
if (
key ==
Attr.
TERMINATED) {
return
done;
}
return
InnerOperator.super.scanUnsafe(
key);
}
@
Override
public void
onNext(T
t) {
if (
done) {
Operators.
onNextDropped(
t,
cachedContext);
return;
}
try {
this.
t =
t;
//noinspection ConstantConditions
onSignal.
accept(this);
}
catch (
Throwable e) {
onError(
Operators.
onOperatorError(
s,
e,
t,
cachedContext));
return;
}
actual.
onNext(
t);
}
@
Override
public void
onError(
Throwable t) {
if (
done) {
Operators.
onErrorDropped(
t,
cachedContext);
return;
}
done = true;
try {
//noinspection ConstantConditions
onSignal.
accept(
Signal.
error(
t,
cachedContext));
}
catch (
Throwable e) {
//this performs a throwIfFatal or suppresses t in e
t =
Operators.
onOperatorError(null,
e,
t,
cachedContext);
}
try {
actual.
onError(
t);
}
catch (
UnsupportedOperationException use) {
if (!
Exceptions.
isErrorCallbackNotImplemented(
use) &&
use.
getCause() !=
t) {
throw
use;
}
//ignore if missing callback
}
}
@
Override
public void
onComplete() {
if (
done) {
return;
}
done = true;
try {
onSignal.
accept(
Signal.
complete(
cachedContext));
}
catch (
Throwable e) {
done = false;
onError(
Operators.
onOperatorError(
s,
e,
cachedContext));
return;
}
actual.
onComplete();
}
@
Override
public
CoreSubscriber<? super T>
actual() {
return
actual;
}
@
Nullable
@
Override
public
Throwable getThrowable() {
return null;
}
@
Nullable
@
Override
public
Subscription getSubscription() {
return null;
}
@
Nullable
@
Override
public T
get() {
return
t;
}
@
Override
public
Context getContext() {
return
cachedContext;
}
@
Override
public
SignalType getType() {
return
SignalType.
ON_NEXT;
}
@
Override
public
String toString() {
return "doOnEach_onNext(" +
t + ")";
}
}
static class
DoOnEachFuseableSubscriber<T> extends
DoOnEachSubscriber<T>
implements
Fuseable,
Fuseable.
QueueSubscription<T> {
boolean
syncFused;
DoOnEachFuseableSubscriber(
CoreSubscriber<? super T>
actual,
Consumer<? super
Signal<T>>
onSignal) {
super(
actual,
onSignal);
}
@
Override
public int
requestFusion(int
mode) {
QueueSubscription<T>
qs = this.
qs;
if (
qs != null && (
mode &
Fuseable.
THREAD_BARRIER) == 0) {
int
m =
qs.
requestFusion(
mode);
if (
m !=
Fuseable.
NONE) {
syncFused =
m ==
Fuseable.
SYNC;
}
return
m;
}
return
Fuseable.
NONE;
}
@
Override
public void
clear() {
qs.
clear(); //throws NPE, but should only be called after onSubscribe on a Fuseable
}
@
Override
public boolean
isEmpty() {
return
qs == null ||
qs.
isEmpty();
}
@
Override
@
Nullable
public T
poll() {
if (
qs == null) {
return null;
}
T
v =
qs.
poll();
if (
v == null &&
syncFused) {
done = true;
try {
onSignal.
accept(
Signal.
complete(
cachedContext));
}
catch (
Throwable e) {
throw
e;
}
} else if (
v != null) {
this.
t =
v;
onSignal.
accept(this); //throws in case of error
}
return
v;
}
@
Override
public int
size() {
return
qs == null ? 0 :
qs.
size();
}
}
static final class
DoOnEachConditionalSubscriber<T> extends
DoOnEachSubscriber<T>
implements
ConditionalSubscriber<T> {
DoOnEachConditionalSubscriber(
ConditionalSubscriber<? super T>
actual,
Consumer<? super
Signal<T>>
onSignal) {
super(
actual,
onSignal);
}
@
Override
@
SuppressWarnings("unchecked")
public boolean
tryOnNext(T
t) {
boolean
result = ((
ConditionalSubscriber<? super T>)
actual).
tryOnNext(
t);
if (
result) {
this.
t =
t;
onSignal.
accept(this);
}
return
result;
}
}
static final class
DoOnEachFuseableConditionalSubscriber<T> extends
DoOnEachFuseableSubscriber<T>
implements
ConditionalSubscriber<T> {
DoOnEachFuseableConditionalSubscriber(
ConditionalSubscriber<? super T>
actual,
Consumer<? super
Signal<T>>
onSignal) {
super(
actual,
onSignal);
}
@
Override
@
SuppressWarnings("unchecked")
public boolean
tryOnNext(T
t) {
boolean
result = ((
ConditionalSubscriber<? super T>)
actual).
tryOnNext(
t);
if (
result) {
this.
t =
t;
onSignal.
accept(this);
}
return
result;
}
}
}