/*
 * 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
 *
 *       https://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.concurrent.Callable;

import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.util.annotation.Nullable;

For each subscriber, a Supplier is invoked and the returned value emitted.
Type parameters:
  • <T> – the value type;
/** * For each subscriber, a Supplier is invoked and the returned value emitted. * * @param <T> the value type; */
final class FluxCallable<T> extends Flux<T> implements Callable<T>, Fuseable, SourceProducer<T> { final Callable<T> callable; FluxCallable(Callable<T> callable) { this.callable = callable; } @Override public void subscribe(CoreSubscriber<? super T> actual) { Operators.MonoSubscriber<T, T> wrapper = new Operators.MonoSubscriber<>(actual); actual.onSubscribe(wrapper); try { T v = callable.call(); if (v == null) { wrapper.onComplete(); } else { wrapper.complete(v); } } catch (Throwable ex) { actual.onError(Operators.onOperatorError(ex, actual.currentContext())); } } @Override @Nullable public T call() throws Exception { return callable.call(); } @Override public Object scanUnsafe(Attr key) { if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC; return null; } }