/*
* 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 org.reactivestreams.
Publisher;
import reactor.core.
CoreSubscriber;
import reactor.core.
Scannable;
import reactor.util.annotation.
Nullable;
/**
* A decorating {@link Mono} {@link Publisher} that exposes {@link Mono} API over an arbitrary {@link Publisher}
* Useful to create operators which return a {@link Mono}, e.g. :
* {@code
* flux.as(Mono::fromDirect)
* .then(d -> Mono.delay(Duration.ofSeconds(1))
* .block();
* }
* @param <I> delegate {@link Publisher} type
*/
final class
MonoSource<I> extends
Mono<I> implements
Scannable,
SourceProducer<I> {
final
Publisher<? extends I>
source;
MonoSource(
Publisher<? extends I>
source) {
this.
source =
Objects.
requireNonNull(
source);
}
/**
* Default is simply delegating and decorating with {@link Mono} API. Note this
* assumes an identity between input and output types.
* @param actual
*/
@
Override
@
SuppressWarnings("unchecked")
public void
subscribe(
CoreSubscriber<? super I>
actual) {
source.
subscribe(
actual);
}
@
Override
@
Nullable
public
Object scanUnsafe(
Attr key) {
if (
key ==
Attr.
PARENT) {
return
source;
}
return null;
}
}