/*
* 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.
Function;
import org.reactivestreams.
Subscription;
import reactor.core.
CoreSubscriber;
import reactor.core.
Fuseable;
import reactor.util.annotation.
Nullable;
import reactor.util.context.
Context;
final class
FluxContextStart<T> extends
FluxOperator<T, T> implements
Fuseable {
final
Function<
Context,
Context>
doOnContext;
FluxContextStart(
Flux<? extends T>
source,
Function<
Context,
Context>
doOnContext) {
super(
source);
this.
doOnContext =
Objects.
requireNonNull(
doOnContext, "doOnContext");
}
@
Override
public void
subscribe(
CoreSubscriber<? super T>
actual) {
Context c;
try {
c =
doOnContext.
apply(
actual.
currentContext());
}
catch (
Throwable t) {
Operators.
error(
actual,
Operators.
onOperatorError(
t,
actual.
currentContext()));
return;
}
source.
subscribe(new
ContextStartSubscriber<>(
actual,
c));
}
static final class
ContextStartSubscriber<T>
implements
ConditionalSubscriber<T>,
InnerOperator<T, T>,
QueueSubscription<T> {
final
CoreSubscriber<? super T>
actual;
final
ConditionalSubscriber<? super T>
actualConditional;
final
Context context;
QueueSubscription<T>
qs;
Subscription s;
@
SuppressWarnings("unchecked")
ContextStartSubscriber(
CoreSubscriber<? super T>
actual,
Context context) {
this.
actual =
actual;
this.
context =
context;
if (
actual instanceof
ConditionalSubscriber) {
this.
actualConditional = (
ConditionalSubscriber<? super T>)
actual;
}
else {
this.
actualConditional = null;
}
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
PARENT) {
return
s;
}
return
InnerOperator.super.scanUnsafe(
key);
}
@
Override
public
Context currentContext() {
return this.
context;
}
@
SuppressWarnings("unchecked")
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s =
s;
if (
s instanceof
QueueSubscription) {
this.
qs = (
QueueSubscription<T>)
s;
}
actual.
onSubscribe(this);
}
}
@
Override
public void
onNext(T
t) {
actual.
onNext(
t);
}
@
Override
public boolean
tryOnNext(T
t) {
if (
actualConditional != null) {
return
actualConditional.
tryOnNext(
t);
}
actual.
onNext(
t);
return true;
}
@
Override
public void
onError(
Throwable t) {
actual.
onError(
t);
}
@
Override
public void
onComplete() {
actual.
onComplete();
}
@
Override
public
CoreSubscriber<? super T>
actual() {
return
actual;
}
@
Override
public void
request(long
n) {
s.
request(
n);
}
@
Override
public void
cancel() {
s.
cancel();
}
@
Override
public int
requestFusion(int
requestedMode) {
if (
qs == null) {
return
Fuseable.
NONE;
}
return
qs.
requestFusion(
requestedMode);
}
@
Override
@
Nullable
public T
poll() {
if (
qs != null) {
return
qs.
poll();
}
return null;
}
@
Override
public boolean
isEmpty() {
return
qs == null ||
qs.
isEmpty();
}
@
Override
public void
clear() {
if (
qs != null) {
qs.
clear();
}
}
@
Override
public int
size() {
return
qs != null ?
qs.
size() : 0;
}
}
}