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/*
* Copyright (c) 2016-2021 VMware Inc. or its affiliates, 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
*
* https://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.CorePublisher;
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.
*
*
* The callbacks are all optional.
*
*
* Crashes by the lambdas are ignored.
*
* @param the value type
* @see Reactive-Streams-Commons
*/
final class FluxPeek extends InternalFluxOperator implements SignalPeek {
final Consumer onSubscribeCall;
final Consumer onNextCall;
final Consumer onErrorCall;
final Runnable onCompleteCall;
final Runnable onAfterTerminateCall;
final LongConsumer onRequestCall;
final Runnable onCancelCall;
FluxPeek(Flux source,
@Nullable Consumer onSubscribeCall,
@Nullable Consumer onNextCall,
@Nullable Consumer 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 CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
if (actual instanceof ConditionalSubscriber) {
@SuppressWarnings("unchecked") // javac, give reason to suppress because inference anomalies
ConditionalSubscriber s2 = (ConditionalSubscriber) actual;
return new PeekConditionalSubscriber<>(s2, this);
}
return new PeekSubscriber<>(actual, this);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class PeekSubscriber implements InnerOperator {
final CoreSubscriber actual;
final SignalPeek parent;
Subscription s;
boolean done;
PeekSubscriber(CoreSubscriber actual, SignalPeek 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;
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
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 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 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 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 actual() {
return actual;
}
}
@Override
@Nullable
public Consumer onSubscribeCall() {
return onSubscribeCall;
}
@Override
@Nullable
public Consumer onNextCall() {
return onNextCall;
}
@Override
@Nullable
public Consumer 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.
*
* - The callback failure is thrown immediately if fatal.
* - {@link Operators#onOperatorError(Throwable, Context)} is called
* - {@link Operators#onErrorDropped(Throwable, Context)} is called
*
*
*
* @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 void afterCompleteWithFailure(SignalPeek 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.
*
* - The callback failure is thrown immediately if fatal.
* - {@link Operators#onOperatorError(Subscription, Throwable, Object, Context)} is
* called, adding the original error as suppressed
* - {@link Operators#onErrorDropped(Throwable, Context)} is called
*
*
*
* @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 void afterErrorWithFailure(SignalPeek parent,
Throwable callbackFailure, Throwable originalError, Context context) {
Exceptions.throwIfFatal(callbackFailure);
Throwable _e = Operators.onOperatorError(null, callbackFailure, originalError, context);
Operators.onErrorDropped(_e, context);
}
}