/*
* 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 java.util.concurrent.
RejectedExecutionException;
import reactor.core.
CoreSubscriber;
import reactor.core.
Fuseable;
import reactor.core.
Scannable;
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,
Scannable{
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(
CoreSubscriber<? super T>
actual) {
FluxSubscribeOnCallable.
CallableSubscribeOnSubscription<T>
parent =
new
FluxSubscribeOnCallable.
CallableSubscribeOnSubscription<>(
actual,
callable,
scheduler);
actual.
onSubscribe(
parent);
try {
parent.
setMainFuture(
scheduler.
schedule(
parent));
}
catch (
RejectedExecutionException ree) {
if(
parent.
state !=
FluxSubscribeOnCallable.
CallableSubscribeOnSubscription.
HAS_CANCELLED) {
actual.
onError(
Operators.
onRejectedExecution(
ree,
actual.
currentContext()));
}
}
}
@
Override
public
Object scanUnsafe(
Scannable.
Attr key) {
if (
key ==
Scannable.
Attr.
RUN_ON) return
scheduler;
return null;
}
}