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/*
 * Copyright (c) 2015-2021 VMware Inc. or its affiliates, 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.Objects;

import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;

/**
 * A Stream that emits only one value and then complete.
 * 

* Since the flux retains the value in a final field, any * {@link this#subscribe(Subscriber)} will * replay the value. This is a "Cold" fluxion. *

* Create such flux with the provided factory, E.g.: *

 * {@code
 * Flux.just(1).subscribe(
 *    log::info,
 *    log::error,
 *    ()-> log.info("complete")
 * )
 * }
 * 
* Will log: *
 * {@code
 * 1
 * complete
 * }
 * 
* * @author Stephane Maldini */ final class FluxJust extends Flux implements Fuseable.ScalarCallable, Fuseable, SourceProducer { final T value; FluxJust(T value) { this.value = Objects.requireNonNull(value, "value"); } @Override public T call() throws Exception { return value; } @Override public void subscribe(final CoreSubscriber actual) { actual.onSubscribe(Operators.scalarSubscription(actual, value, "just")); } @Override public Object scanUnsafe(Attr key) { if (key == Attr.BUFFERED) return 1; if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC; return null; } }




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