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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 reactor.core.CoreSubscriber;

/**
 * Repeatedly subscribes to the source sequence if it signals any error
 * either indefinitely or a fixed number of times.
 * 
 * The times == Long.MAX_VALUE is treated as infinite retry.
 *
 * @param  the value type
 * @see Reactive-Streams-Commons
 */
final class MonoRetry extends InternalMonoOperator {

	final long times;

	MonoRetry(Mono source, long times) {
		super(source);
		if (times < 0L) {
			throw new IllegalArgumentException("times >= 0 required");
		}
		this.times = times;
	}

	@Override
	public CoreSubscriber subscribeOrReturn(CoreSubscriber actual) {
		FluxRetry.RetrySubscriber parent = new FluxRetry.RetrySubscriber<>(source,
				actual, times);

		actual.onSubscribe(parent);

		if (!parent.isCancelled()) {
			parent.resubscribe();
		}
		return null;
	}

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