/*
* 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.
Consumer;
import org.reactivestreams.
Publisher;
import org.reactivestreams.
Subscription;
import reactor.core.
CoreSubscriber;
import reactor.util.annotation.
Nullable;
import reactor.util.context.
Context;
/**
* Delays the subscription to the main source until another Publisher
* signals a value or completes.
*
* @param <T> the main source value type
* @param <U> the other source type
* @see <a href="https://github.com/reactor/reactive-streams-commons">Reactive-Streams-Commons</a>
*/
final class
FluxDelaySubscription<T, U> extends
FluxOperator<T, T>
implements
Consumer<
FluxDelaySubscription.
DelaySubscriptionOtherSubscriber<T, U>> {
final
Publisher<U>
other;
FluxDelaySubscription(
Flux<? extends T>
source,
Publisher<U>
other) {
super(
source);
this.
other =
Objects.
requireNonNull(
other, "other");
}
@
Override
public int
getPrefetch() {
return
Integer.
MAX_VALUE;
}
@
Override
public void
subscribe(
CoreSubscriber<? super T>
actual) {
other.
subscribe(new
DelaySubscriptionOtherSubscriber<>(
actual, this));
}
@
Override
public void
accept(
DelaySubscriptionOtherSubscriber<T, U>
s) {
source.
subscribe(new
DelaySubscriptionMainSubscriber<>(
s.
actual,
s));
}
static final class
DelaySubscriptionOtherSubscriber<T, U>
extends
Operators.
DeferredSubscription implements
InnerOperator<U, T> {
final
Consumer<
FluxDelaySubscription.
DelaySubscriptionOtherSubscriber<T, U>>
source;
final
CoreSubscriber<? super T>
actual;
Subscription s;
boolean
done;
DelaySubscriptionOtherSubscriber(
CoreSubscriber<? super T>
actual,
Consumer<
FluxDelaySubscription.
DelaySubscriptionOtherSubscriber<T, U>>
source) {
this.
actual =
actual;
this.
source =
source;
}
@
Override
public
Context currentContext() {
return
actual.
currentContext();
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
PARENT) return
s;
if (
key ==
Attr.
ACTUAL) return
actual;
if (
key ==
Attr.
TERMINATED) return
done;
return super.scanUnsafe(
key);
}
@
Override
public
CoreSubscriber<? super T>
actual() {
return
actual;
}
@
Override
public void
cancel() {
s.
cancel();
super.cancel();
}
@
Override
public void
onSubscribe(
Subscription s) {
if (
Operators.
validate(this.
s,
s)) {
this.
s =
s;
actual.
onSubscribe(this);
s.
request(
Long.
MAX_VALUE);
}
}
@
Override
public void
onNext(U
t) {
if (
done) {
return;
}
done = true;
s.
cancel();
source.
accept(this);
}
@
Override
public void
onError(
Throwable t) {
if (
done) {
Operators.
onErrorDropped(
t,
actual.
currentContext());
return;
}
done = true;
actual.
onError(
t);
}
@
Override
public void
onComplete() {
if (
done) {
return;
}
done = true;
source.
accept(this);
}
}
static final class
DelaySubscriptionMainSubscriber<T>
implements
InnerConsumer<T> {
final
CoreSubscriber<? super T>
actual;
final
DelaySubscriptionOtherSubscriber<?, ?>
arbiter;
DelaySubscriptionMainSubscriber(
CoreSubscriber<? super T>
actual,
DelaySubscriptionOtherSubscriber<?, ?>
arbiter) {
this.
actual =
actual;
this.
arbiter =
arbiter;
}
@
Override
public
Context currentContext() {
return
arbiter.
currentContext();
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
ACTUAL) return
actual;
return null;
}
@
Override
public void
onSubscribe(
Subscription s) {
arbiter.
set(
s);
}
@
Override
public void
onNext(T
t) {
actual.
onNext(
t);
}
@
Override
public void
onError(
Throwable t) {
actual.
onError(
t);
}
@
Override
public void
onComplete() {
actual.
onComplete();
}
}
}