/*
* 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.concurrent.Callable;
import org.reactivestreams.Subscriber;
import reactor.core.Disposable;
import reactor.core.Fuseable;
import reactor.core.scheduler.Scheduler;
/**
* Executes a Callable and emits its value on the given Scheduler.
*
* @param <T> the value type
* @see <a href="https://github.com/reactor/reactive-streams-commons">https://github.com/reactor/reactive-streams-commons</a>
*/
final class MonoSubscribeOnCallable<T> extends Mono<T> implements Fuseable {
final Callable<? extends T> callable;
final Scheduler scheduler;
MonoSubscribeOnCallable(Callable<? extends T> callable, Scheduler scheduler) {
this.callable = Objects.requireNonNull(callable, "callable");
this.scheduler = Objects.requireNonNull(scheduler, "scheduler");
}
@Override
public void subscribe(Subscriber<? super T> s) {
FluxSubscribeOnCallable.CallableSubscribeOnSubscription<T> parent =
new FluxSubscribeOnCallable.CallableSubscribeOnSubscription<>(s, callable, scheduler);
s.onSubscribe(parent);
Disposable f = scheduler.schedule(parent);
if (f == Scheduler.REJECTED) {
if(parent.state != FluxSubscribeOnCallable.CallableSubscribeOnSubscription.HAS_CANCELLED) {
s.onError(Operators.onRejectedExecution());
}
}
else {
parent.setMainFuture(f);
}
}
}