/*
* 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.function.
Consumer;
import java.util.function.
LongConsumer;
import org.reactivestreams.
Subscription;
import reactor.core.
CoreSubscriber;
import reactor.core.
Exceptions;
import reactor.core.
Fuseable.
ConditionalSubscriber;
import reactor.core.publisher.
FluxPeekFuseable.
PeekConditionalSubscriber;
import reactor.util.annotation.
Nullable;
import reactor.util.context.
Context;
/**
* Peek into the lifecycle events and signals of a sequence.
* <p>
* <p>
* The callbacks are all optional.
* <p>
* <p>
* Crashes by the lambdas are ignored.
*
* @param <T> the value type
* @see <a href="https://github.com/reactor/reactive-streams-commons">Reactive-Streams-Commons</a>
*/
final class
FluxPeek<T> extends
FluxOperator<T, T> implements
SignalPeek<T> {
final
Consumer<? super
Subscription>
onSubscribeCall;
final
Consumer<? super T>
onNextCall;
final
Consumer<? super
Throwable>
onErrorCall;
final
Runnable onCompleteCall;
final
Runnable onAfterTerminateCall;
final
LongConsumer onRequestCall;
final
Runnable onCancelCall;
FluxPeek(
Flux<? extends T>
source,
@
Nullable Consumer<? super
Subscription>
onSubscribeCall,
@
Nullable Consumer<? super T>
onNextCall,
@
Nullable Consumer<? super
Throwable>
onErrorCall,
@
Nullable Runnable onCompleteCall,
@
Nullable Runnable onAfterTerminateCall,
@
Nullable LongConsumer onRequestCall,
@
Nullable Runnable onCancelCall) {
super(
source);
this.
onSubscribeCall =
onSubscribeCall;
this.
onNextCall =
onNextCall;
this.
onErrorCall =
onErrorCall;
this.
onCompleteCall =
onCompleteCall;
this.
onAfterTerminateCall =
onAfterTerminateCall;
this.
onRequestCall =
onRequestCall;
this.
onCancelCall =
onCancelCall;
}
@
Override
public void
subscribe(
CoreSubscriber<? super T>
actual) {
if (
actual instanceof
ConditionalSubscriber) {
@
SuppressWarnings("unchecked") // javac, give reason to suppress because inference anomalies
ConditionalSubscriber<T>
s2 = (
ConditionalSubscriber<T>)
actual;
source.
subscribe(new
PeekConditionalSubscriber<>(
s2, this));
return;
}
source.
subscribe(new
PeekSubscriber<>(
actual, this));
}
static final class
PeekSubscriber<T> implements
InnerOperator<T, T> {
final
CoreSubscriber<? super T>
actual;
final
SignalPeek<T>
parent;
Subscription s;
boolean
done;
PeekSubscriber(
CoreSubscriber<? super T>
actual,
SignalPeek<T>
parent) {
this.
actual =
actual;
this.
parent =
parent;
}
@
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
Context currentContext() {
Context c =
actual.
currentContext();
if(!
c.
isEmpty() &&
parent.
onCurrentContextCall() != null) {
parent.
onCurrentContextCall().
accept(
c);
}
return
c;
}
@
Override
public void
request(long
n) {
final
LongConsumer requestHook =
parent.
onRequestCall();
if (
requestHook != null) {
try {
requestHook.
accept(
n);
}
catch (
Throwable e) {
Operators.
onOperatorError(
e,
actual.
currentContext());
}
}
s.
request(
n);
}
@
Override
public void
cancel() {
final
Runnable cancelHook =
parent.
onCancelCall();
if (
cancelHook != null) {
try {
cancelHook.
run();
}
catch (
Throwable e) {
onError(
Operators.
onOperatorError(
s,
e,
actual.
currentContext()));
return;
}
}
s.
cancel();
}
@
Override
public void
onSubscribe(
Subscription s) {
if(
Operators.
validate(this.
s,
s)) {
final
Consumer<? super
Subscription>
subscribeHook =
parent.
onSubscribeCall();
if (
subscribeHook != null) {
try {
subscribeHook.
accept(
s);
}
catch (
Throwable e) {
Operators.
error(
actual,
Operators.
onOperatorError(
s,
e,
actual.
currentContext()));
return;
}
}
this.
s =
s;
actual.
onSubscribe(this);
}
}
@
Override
public void
onNext(T
t) {
if (
done) {
Operators.
onNextDropped(
t,
actual.
currentContext());
return;
}
final
Consumer<? super T>
nextHook =
parent.
onNextCall();
if(
nextHook != null) {
try {
nextHook.
accept(
t);
}
catch (
Throwable e) {
Throwable e_ =
Operators.
onNextError(
t,
e,
actual.
currentContext(),
s);
if (
e_ == null) {
request(1);
return;
}
else {
onError(
e_);
return;
}
}
}
actual.
onNext(
t);
}
@
Override
public void
onError(
Throwable t) {
if (
done) {
Operators.
onErrorDropped(
t,
actual.
currentContext());
return;
}
done = true;
final
Consumer<? super
Throwable>
errorHook =
parent.
onErrorCall();
if(
errorHook != null) {
try {
errorHook.
accept(
t);
}
catch (
Throwable e) {
//this performs a throwIfFatal or suppresses t in e
t =
Operators.
onOperatorError(null,
e,
t,
actual.
currentContext());
}
}
try {
actual.
onError(
t);
}
catch (
UnsupportedOperationException use){
if(
errorHook == null
|| !
Exceptions.
isErrorCallbackNotImplemented(
use) &&
use.
getCause() !=
t){
throw
use;
}
//ignore if missing callback
}
final
Runnable afterTerminateHook =
parent.
onAfterTerminateCall();
if(
afterTerminateHook != null) {
try {
afterTerminateHook.
run();
}
catch (
Throwable e) {
afterErrorWithFailure(
parent,
e,
t,
actual.
currentContext());
}
}
}
@
Override
public void
onComplete() {
if (
done) {
return;
}
final
Runnable completeHook =
parent.
onCompleteCall();
if(
completeHook != null) {
try {
completeHook.
run();
}
catch (
Throwable e) {
onError(
Operators.
onOperatorError(
s,
e,
actual.
currentContext()));
return;
}
}
done = true;
actual.
onComplete();
final
Runnable afterTerminateHook =
parent.
onAfterTerminateCall();
if(
afterTerminateHook != null) {
try {
afterTerminateHook.
run();
}
catch (
Throwable e) {
afterCompleteWithFailure(
parent,
e,
actual.
currentContext());
}
}
}
@
Override
public
CoreSubscriber<? super T>
actual() {
return
actual;
}
}
@
Override
@
Nullable
public
Consumer<? super
Subscription>
onSubscribeCall() {
return
onSubscribeCall;
}
@
Override
@
Nullable
public
Consumer<? super T>
onNextCall() {
return
onNextCall;
}
@
Override
@
Nullable
public
Consumer<? super
Throwable>
onErrorCall() {
return
onErrorCall;
}
@
Override
@
Nullable
public
Runnable onCompleteCall() {
return
onCompleteCall;
}
@
Override
@
Nullable
public
Runnable onAfterTerminateCall() {
return
onAfterTerminateCall;
}
@
Override
@
Nullable
public
LongConsumer onRequestCall() {
return
onRequestCall;
}
@
Override
@
Nullable
public
Runnable onCancelCall() {
return
onCancelCall;
}
/**
* Common method for FluxPeek and FluxPeekFuseable to deal with a doAfterTerminate
* callback that fails during onComplete. It drops the error to the global hook.
* <ul>
* <li>The callback failure is thrown immediately if fatal.</li>
* <li>{@link Operators#onOperatorError(Throwable, Context)} is called</li>
* <li>{@link Operators#onErrorDropped(Throwable, Context)} is called</li>
* </ul>
* <p>
*
* @param parent the {@link SignalPeek} from which to get the callbacks
* @param callbackFailure the afterTerminate callback failure
* @param context subscriber context
*/
//see https://github.com/reactor/reactor-core/issues/270
static <T> void
afterCompleteWithFailure(
SignalPeek<T>
parent,
Throwable callbackFailure,
Context context) {
Exceptions.
throwIfFatal(
callbackFailure);
Throwable _e =
Operators.
onOperatorError(
callbackFailure,
context);
Operators.
onErrorDropped(
_e,
context);
}
/**
* Common method for FluxPeek and FluxPeekFuseable to deal with a doAfterTerminate
* callback that fails during onError. It drops the error to the global hook.
* <ul>
* <li>The callback failure is thrown immediately if fatal.</li>
* <li>{@link Operators#onOperatorError(Subscription, Throwable, Object, Context)} is
* called, adding the original error as suppressed</li>
* <li>{@link Operators#onErrorDropped(Throwable, Context)} is called</li>
* </ul>
* <p>
*
* @param parent the {@link SignalPeek} from which to get the callbacks
* @param callbackFailure the afterTerminate callback failure
* @param originalError the onError throwable
* @param context subscriber context
*/
//see https://github.com/reactor/reactor-core/issues/270
static <T> void
afterErrorWithFailure(
SignalPeek<T>
parent,
Throwable callbackFailure,
Throwable originalError,
Context context) {
Exceptions.
throwIfFatal(
callbackFailure);
Throwable _e =
Operators.
onOperatorError(null,
callbackFailure,
originalError,
context);
Operators.
onErrorDropped(
_e,
context);
}
}