/*
* 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;
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
FluxPeekFuseable<T> extends
FluxOperator<T, T>
implements
Fuseable,
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;
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 void
subscribe(
CoreSubscriber<? super T>
actual) {
if (
actual instanceof
ConditionalSubscriber) {
source.
subscribe(new
PeekFuseableConditionalSubscriber<>((
ConditionalSubscriber<? super T>)
actual,
this));
return;
}
source.
subscribe(new
PeekFuseableSubscriber<>(
actual, this));
}
static final class
PeekFuseableSubscriber<T>
implements
InnerOperator<T, T>,
QueueSubscription<T> {
final
CoreSubscriber<? super T>
actual;
final
SignalPeek<T>
parent;
QueueSubscription<T>
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;
return
InnerOperator.super.scanUnsafe(
key);
}
PeekFuseableSubscriber(
CoreSubscriber<? super T>
actual,
SignalPeek<T>
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<T>)
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()));
}
}
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<T>
implements
ConditionalSubscriber<T>,
InnerOperator<T, T>,
QueueSubscription<T> {
final
ConditionalSubscriber<? super T>
actual;
final
SignalPeek<T>
parent;
QueueSubscription<T>
s;
int
sourceMode;
volatile boolean
done;
PeekFuseableConditionalSubscriber(
ConditionalSubscriber<? super T>
actual,
SignalPeek<T>
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;
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<T>)
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()));
}
}
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<T>
implements
ConditionalSubscriber<T>,
InnerOperator<T, T> {
final
ConditionalSubscriber<? super T>
actual;
final
SignalPeek<T>
parent;
Subscription s;
boolean
done;
PeekConditionalSubscriber(
ConditionalSubscriber<? super T>
actual,
SignalPeek<T>
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;
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;
}
}
}