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/*
 * Copyright (c) 2016-2021 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 org.reactivestreams.Subscriber;

import reactor.core.CoreSubscriber;

/**
 * Hook into the {@link org.reactivestreams.Publisher#subscribe(Subscriber)} of a
 * {@link Flux} and execute a provided callback before calling
 * {@link org.reactivestreams.Publisher#subscribe(Subscriber)} directly with the
 * {@link CoreSubscriber}.
 *
 * 

* Note that any exceptions thrown by the hook short circuit the subscription process and * are forwarded to the {@link Subscriber}'s {@link Subscriber#onError(Throwable)} method. * * @param the value type * @author Simon Baslé */ final class FluxDoFirst extends InternalFluxOperator { final Runnable onFirst; FluxDoFirst(Flux source, Runnable onFirst) { super(source); this.onFirst = onFirst; } @Override public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) { onFirst.run(); return actual; } @Override public Object scanUnsafe(Attr key) { if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC; return super.scanUnsafe(key); } }





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