/*
* Copyright (c) 2011-2018 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.concurrent.
CompletionStage;
import reactor.core.
CoreSubscriber;
import reactor.core.
Exceptions;
import reactor.core.
Fuseable;
import reactor.core.
Scannable;
import reactor.util.
Logger;
import reactor.util.
Loggers;
/**
* Emits the value or error produced by the wrapped CompletionStage.
* <p>
* Note that if Subscribers cancel their subscriptions, the CompletionStage
* is not cancelled.
*
* @param <T> the value type
*/
final class
MonoCompletionStage<T> extends
Mono<T>
implements
Fuseable,
Scannable {
static final
Logger LOGGER =
Loggers.
getLogger(
MonoCompletionStage.class);
final
CompletionStage<? extends T>
future;
MonoCompletionStage(
CompletionStage<? extends T>
future) {
this.
future =
Objects.
requireNonNull(
future, "future");
}
@
Override
public void
subscribe(
CoreSubscriber<? super T>
actual) {
Operators.
MonoSubscriber<T, T>
sds = new
Operators.
MonoSubscriber<>(
actual);
actual.
onSubscribe(
sds);
if (
sds.
isCancelled()) {
return;
}
future.
whenComplete((
v,
e) -> {
try {
if (
e != null) {
actual.
onError(
e);
}
else if (
v != null) {
sds.
complete(
v);
}
else {
actual.
onComplete();
}
}
catch (
Throwable e1) {
Operators.
onErrorDropped(
e1,
actual.
currentContext());
throw
Exceptions.
bubble(
e1);
}
});
}
@
Override
public
Object scanUnsafe(
Attr key) {
return null; //no particular key to be represented, still useful in hooks
}
}