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/*
 * Copyright (c) 2016-2023 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 reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.util.annotation.Nullable;

/**
 * Represents an empty publisher which only calls onSubscribe and onComplete.
 * 

* This Publisher is effectively stateless and only a single instance exists. * Use the {@link #instance()} method to obtain a properly type-parametrized view of it. * @see Reactive-Streams-Commons */ final class FluxEmpty extends Flux implements Fuseable.ScalarCallable, SourceProducer { private static final Flux INSTANCE = new FluxEmpty(); private FluxEmpty() { // deliberately no op } @Override public void subscribe(CoreSubscriber actual) { Operators.complete(actual); } @Override public Object scanUnsafe(Attr key) { if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC; return SourceProducer.super.scanUnsafe(key); } /** * Returns a properly parametrized instance of this empty Publisher. * * @param the output type * @return a properly parametrized instance of this empty Publisher */ @SuppressWarnings("unchecked") public static Flux instance() { return (Flux) INSTANCE; } @Override @Nullable public Object call() throws Exception { return null; /* Scalar optimizations on empty */ } }