/*
 * 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
 * limitations under the License.
 */
package reactor.core.publisher;

import reactor.core.CoreSubscriber;
import reactor.core.Fuseable.ConditionalSubscriber;
import reactor.core.publisher.FluxPeekFuseable.PeekConditionalSubscriber;

Peek into the lifecycle events and signals of a sequence.


The callbacks are all optional.


Crashes by the lambdas are ignored.
Type parameters:
<T> – the value type
See Also:
Reactive-Streams-Commons/**
 * Peek into the lifecycle events and signals of a sequence.
 * <p>
 * <p>
 * The callbacks are all optional.
 * <p>
 * <p>
 * Crashes by the lambdas are ignored.
 *
 * @param <T> the value type
 * @see <a href="https://github.com/reactor/reactive-streams-commons">Reactive-Streams-Commons</a>
 */
final class MonoLog<T> extends InternalMonoOperator<T, T> {

	final SignalPeek<T> log;

	MonoLog(Mono<? extends T> source, SignalPeek<T> log) {
		super(source);
		this.log = log;
	}

	@Override
	public CoreSubscriber<? super T> subscribeOrReturn(CoreSubscriber<? super T> actual) {
		if (actual instanceof ConditionalSubscriber) {
			@SuppressWarnings("unchecked") // javac, give reason to suppress because inference anomalies
					ConditionalSubscriber<T> s2 = (ConditionalSubscriber<T>) actual;
			return new PeekConditionalSubscriber<>(s2, log);
		}
		return new FluxPeek.PeekSubscriber<>(actual, log);
	}

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