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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;
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 FluxPeekFuseable extends InternalFluxOperator
implements Fuseable, SignalPeek {
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;
FluxPeekFuseable(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
@SuppressWarnings("unchecked")
public CoreSubscriber super T> subscribeOrReturn(CoreSubscriber super T> actual) {
if (actual instanceof ConditionalSubscriber) {
return new PeekFuseableConditionalSubscriber<>((ConditionalSubscriber super T>) actual, this);
}
return new PeekFuseableSubscriber<>(actual, this);
}
@Override
public Object scanUnsafe(Attr key) {
if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
return super.scanUnsafe(key);
}
static final class PeekFuseableSubscriber
implements InnerOperator, QueueSubscription {
final CoreSubscriber super T> actual;
final SignalPeek parent;
QueueSubscription s;
int sourceMode;
volatile boolean done;
@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);
}
PeekFuseableSubscriber(CoreSubscriber super T> actual,
SignalPeek parent) {
this.actual = actual;
this.parent = parent;
}
@Override
public Context currentContext() {
Context c = actual.currentContext();
final Consumer super Context> contextHook = parent.onCurrentContextCall();
if(!c.isEmpty() && contextHook != null) {
contextHook.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();
}
@SuppressWarnings("unchecked")
@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 = (QueueSubscription) 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;
}
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) {
Exceptions.throwIfFatal(t);
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;
}
}
final Runnable afterTerminateHook = parent.onAfterTerminateCall();
if (afterTerminateHook != null) {
try {
afterTerminateHook.run();
}
catch (Throwable e) {
FluxPeek.afterErrorWithFailure(parent, e, t, actual.currentContext());
}
}
}
@Override
public void onComplete() {
if (done) {
return;
}
if (sourceMode == ASYNC) {
done = true;
actual.onComplete();
}
else {
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) {
FluxPeek.afterCompleteWithFailure(parent, e, actual.currentContext());
}
}
}
}
@Override
public CoreSubscriber super T> actual() {
return actual;
}
@Override
@Nullable
public T poll() {
boolean d = done;
T v;
try {
v = s.poll();
}
catch (Throwable e) {
final Consumer super Throwable> errorHook = parent.onErrorCall();
if (errorHook != null) {
try {
errorHook.accept(e);
}
catch (Throwable errorCallbackError) {
throw Exceptions.propagate(Operators.onOperatorError(s, errorCallbackError, e,
actual.currentContext()));
}
}
Runnable afterTerminateHook = parent.onAfterTerminateCall();
if (afterTerminateHook != null) {
try {
afterTerminateHook.run();
}
catch (Throwable afterTerminateCallbackError) {
throw Exceptions.propagate(Operators.onOperatorError(s, afterTerminateCallbackError, e,
actual.currentContext()));
}
}
throw Exceptions.propagate(Operators.onOperatorError(s, e,
actual.currentContext()));
}
final Consumer super T> nextHook = parent.onNextCall();
if (v != null && nextHook != null) {
try {
nextHook.accept(v);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(v, e, actual.currentContext(), s);
if (e_ == null) {
return poll();
}
else {
throw Exceptions.propagate(e_);
}
}
}
if (v == null && (d || sourceMode == SYNC)) {
Runnable call = parent.onCompleteCall();
if (call != null) {
call.run();
}
call = parent.onAfterTerminateCall();
if (call != null) {
call.run();
}
}
return v;
}
@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 PeekFuseableConditionalSubscriber
implements ConditionalSubscriber, InnerOperator,
QueueSubscription {
final ConditionalSubscriber super T> actual;
final SignalPeek parent;
QueueSubscription s;
int sourceMode;
volatile boolean done;
PeekFuseableConditionalSubscriber(ConditionalSubscriber super T> actual,
SignalPeek parent) {
this.actual = actual;
this.parent = parent;
}
@Override
public Context currentContext() {
Context c = actual.currentContext();
final Consumer super Context> contextHook = parent.onCurrentContextCall();
if(!c.isEmpty() && contextHook != null) {
contextHook.accept(c);
}
return c;
}
@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 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();
}
@SuppressWarnings("unchecked")
@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 = (QueueSubscription) 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;
}
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 boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return false;
}
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) {
return false;
}
else {
onError(e_);
return true;
}
}
}
return actual.tryOnNext(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) {
Exceptions.throwIfFatal(t);
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;
}
}
final Runnable afterTerminateHook = parent.onAfterTerminateCall();
if (afterTerminateHook != null) {
try {
afterTerminateHook.run();
}
catch (Throwable e) {
FluxPeek.afterErrorWithFailure(parent, e, t, actual.currentContext());
}
}
}
@Override
public void onComplete() {
if (done) {
return;
}
if (sourceMode == ASYNC) {
done = true;
actual.onComplete();
}
else {
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) {
FluxPeek.afterCompleteWithFailure(parent, e, actual.currentContext());
}
}
}
}
@Override
public CoreSubscriber super T> actual() {
return actual;
}
@Override
@Nullable
public T poll() {
boolean d = done;
T v;
try {
v = s.poll();
}
catch (Throwable e) {
final Consumer super Throwable> errorHook = parent.onErrorCall();
if (errorHook != null) {
try {
errorHook.accept(e);
}
catch (Throwable errorCallbackError) {
throw Exceptions.propagate(Operators.onOperatorError(s, errorCallbackError, e,
actual.currentContext()));
}
}
Runnable afterTerminateHook = parent.onAfterTerminateCall();
if (afterTerminateHook != null) {
try {
afterTerminateHook.run();
}
catch (Throwable afterTerminateCallbackError) {
throw Exceptions.propagate(Operators.onOperatorError(s, afterTerminateCallbackError, e,
actual.currentContext()));
}
}
throw Exceptions.propagate(Operators.onOperatorError(s, e,
actual.currentContext()));
}
final Consumer super T> nextHook = parent.onNextCall();
if (v != null && nextHook != null) {
try {
nextHook.accept(v);
}
catch (Throwable e) {
Throwable e_ = Operators.onNextError(v, e, actual.currentContext(), s);
if (e_ == null) {
return poll();
}
else {
throw Exceptions.propagate(e_);
}
}
}
if (v == null && (d || sourceMode == SYNC)) {
Runnable call = parent.onCompleteCall();
if (call != null) {
call.run();
}
call = parent.onAfterTerminateCall();
if (call != null) {
call.run();
}
}
return v;
}
@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();
}
}
@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;
}
static final class PeekConditionalSubscriber
implements ConditionalSubscriber, InnerOperator {
final ConditionalSubscriber super T> actual;
final SignalPeek parent;
Subscription s;
boolean done;
PeekConditionalSubscriber(ConditionalSubscriber super T> actual,
SignalPeek parent) {
this.actual = actual;
this.parent = parent;
}
@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
@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 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 boolean tryOnNext(T t) {
if (done) {
Operators.onNextDropped(t, actual.currentContext());
return false;
}
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) {
return false;
}
else {
onError(e_);
return true;
}
}
}
return actual.tryOnNext(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) {
Exceptions.throwIfFatal(t);
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;
}
}
final Runnable afterTerminateHook = parent.onAfterTerminateCall();
if (afterTerminateHook != null) {
try {
afterTerminateHook.run();
}
catch (Throwable e) {
FluxPeek.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) {
FluxPeek.afterCompleteWithFailure(parent, e, actual.currentContext());
}
}
}
@Override
public CoreSubscriber super T> actual() {
return actual;
}
}
}