/*
 * 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.
Type parameters:
  • <T> – the value type
See Also:
/** * 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; } }