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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 java.util.Objects;

import reactor.core.CoreSubscriber;
import reactor.util.retry.Retry;

/**
 * retries a source when a companion sequence signals an item in response to the main's
 * error signal
 * 
 * If the companion sequence signals when the main source is active, the repeat attempt
 * is suppressed and any terminal signal will terminate the main source with the same
 * signal immediately.
 *
 * @param  the source value type
 * @see Reactive-Streams-Commons
 */
final class MonoRetryWhen extends InternalMonoOperator {

	final Retry whenSourceFactory;

	MonoRetryWhen(Mono source, Retry whenSourceFactory) {
		super(Mono.fromDirect(source));
		this.whenSourceFactory = Objects.requireNonNull(whenSourceFactory, "whenSourceFactory");
	}

	@Override
	public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
		FluxRetryWhen.subscribe(actual, whenSourceFactory, source);
		return null;
	}

	@Override
	public Object scanUnsafe(Attr key) {
		if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
		return super.scanUnsafe(key);
	}
}