/*
 * 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
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package reactor.core.publisher;

Blocks until the upstream signals its first value or completes.
Type parameters:
  • <T> – the value type
See Also:
/** * Blocks until the upstream signals its first value or completes. * * @param <T> the value type * @see <a href="https://github.com/reactor/reactive-streams-commons">https://github.com/reactor/reactive-streams-commons</a> */
final class BlockingFirstSubscriber<T> extends BlockingSingleSubscriber<T> { @Override public void onNext(T t) { if (value == null) { value = t; dispose(); countDown(); } } @Override public void onError(Throwable t) { if (value == null) { error = t; } countDown(); } }