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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;

/**
 * Blocks assuming the upstream is a Mono, until it signals its value or completes.
 * Compared to {@link BlockingFirstSubscriber}, this variant doesn't cancel the upstream
 * in onNext.
 *
 * @param  the value type
 * @see https://github.com/reactor/reactive-streams-commons
 */
final class BlockingMonoSubscriber extends BlockingSingleSubscriber {

	@Override
	public void onNext(T t) {
		if (value == null) {
			value = t;
			countDown();
		}
	}

	@Override
	public void onError(Throwable t) {
		if (value == null) {
			error = t;
		}
		countDown();
	}

	@Override
	public String stepName() {
		return "block";
	}
}