reactor.core.publisher.MonoRetryPredicate Maven / Gradle / Ivy

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/*
 * 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
 *
 *       http://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 java.util.function.Predicate;

import reactor.core.CoreSubscriber;

/**
 * Repeatedly subscribes to the source if the predicate returns true after completion of
 * the previous subscription.
 *
 * @param  the value type
 * @see Reactive-Streams-Commons
 */
final class MonoRetryPredicate extends MonoOperator {

	final Predicate predicate;

	MonoRetryPredicate(Mono source,
			Predicate predicate) {
		super(source);
		this.predicate = Objects.requireNonNull(predicate, "predicate");
	}

	@Override
	public void subscribe(CoreSubscriber actual) {

		FluxRetryPredicate.RetryPredicateSubscriber parent =
				new FluxRetryPredicate.RetryPredicateSubscriber<>(source,
						actual, predicate);

		actual.onSubscribe(parent);

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