/*
 * 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.RejectedExecutionException;

import reactor.core.CoreSubscriber;
import reactor.core.Scannable;
import reactor.core.publisher.FluxSubscribeOnValue.ScheduledEmpty;
import reactor.core.publisher.FluxSubscribeOnValue.ScheduledScalar;
import reactor.core.scheduler.Scheduler;
import reactor.util.annotation.Nullable;

Mono indicating a scalar/empty source that subscribes on the specified scheduler.
Type parameters:
  • <T> –
/** * Mono indicating a scalar/empty source that subscribes on the specified scheduler. * * @param <T> */
final class MonoSubscribeOnValue<T> extends Mono<T> implements Scannable { final T value; final Scheduler scheduler; MonoSubscribeOnValue(@Nullable T value, Scheduler scheduler) { this.value = value; this.scheduler = Objects.requireNonNull(scheduler, "scheduler"); } @Override public void subscribe(CoreSubscriber<? super T> actual) { T v = value; if (v == null) { ScheduledEmpty parent = new ScheduledEmpty(actual); actual.onSubscribe(parent); try { parent.setFuture(scheduler.schedule(parent)); } catch (RejectedExecutionException ree) { if (parent.future != OperatorDisposables.DISPOSED) { actual.onError(Operators.onRejectedExecution(ree, actual.currentContext())); } } } else { actual.onSubscribe(new ScheduledScalar<>(actual, v, scheduler)); } } @Override public Object scanUnsafe(Attr key) { if (key == Attr.RUN_ON) return scheduler; return null; } }