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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC

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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.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.LongConsumer;

import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.core.Scannable;
import reactor.util.annotation.Nullable;
import reactor.util.context.Context;

/**
 * Execute a Consumer in each 'rail' for the current element passing through.
 *
 * @param  the value type
 */
final class ParallelDoOnEach extends ParallelFlux implements Scannable {

	final ParallelFlux source;

	final BiConsumer         onNext;
	final BiConsumer onError;
	final Consumer                      onComplete;

	ParallelDoOnEach(
			ParallelFlux source,
			@Nullable BiConsumer onNext,
			@Nullable BiConsumer onError,
			@Nullable Consumer onComplete
	) {
		this.source = ParallelFlux.from(source);

		this.onNext = onNext;
		this.onError = onError;
		this.onComplete = onComplete;
	}

	@Override
	@SuppressWarnings("unchecked")
	public void subscribe(CoreSubscriber[] subscribers) {
		if (!validate(subscribers)) {
			return;
		}

		int n = subscribers.length;

		CoreSubscriber[] parents = new CoreSubscriber[n];

		boolean conditional = subscribers[0] instanceof Fuseable.ConditionalSubscriber;

		for (int i = 0; i < n; i++) {
			CoreSubscriber subscriber = subscribers[i];
			SignalPeek signalPeek = new DoOnEachSignalPeek(subscriber.currentContext());

			if (conditional) {
				parents[i] = new FluxPeekFuseable.PeekConditionalSubscriber<>(
						(Fuseable.ConditionalSubscriber) subscriber, signalPeek);
			}
			else {
				parents[i] = new FluxPeek.PeekSubscriber<>(subscriber, signalPeek);
			}
		}

		source.subscribe(parents);
	}

	@Override
	public int parallelism() {
		return source.parallelism();
	}

	@Override
	public int getPrefetch() {
		return source.getPrefetch();
	}

	@Override
	@Nullable
	public Object scanUnsafe(Attr key) {
		if (key == Attr.PARENT) return source;
		if (key == Attr.PREFETCH) return getPrefetch();
		if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;
		if (key == InternalProducerAttr.INSTANCE) return true;

		return null;
	}

	private class DoOnEachSignalPeek implements SignalPeek {

		Consumer onNextCall;

		Consumer onErrorCall;

		Runnable onCompleteCall;

		public DoOnEachSignalPeek(Context ctx) {
			onNextCall = onNext != null ? v -> onNext.accept(ctx, v) : null;
			onErrorCall = onError != null ? e -> onError.accept(ctx, e) : null;
			onCompleteCall = onComplete != null ? () -> onComplete.accept(ctx) : null;
		}

		@Override
		public Consumer onSubscribeCall() {
			return null;
		}

		@Override
		public Consumer onNextCall() {
			return onNextCall;
		}

		@Override
		public Consumer onErrorCall() {
			return onErrorCall;
		}

		@Override
		public Runnable onCompleteCall() {
			return onCompleteCall;
		}

		@Override
		public Runnable onAfterTerminateCall() {
			return null;
		}

		@Override
		public LongConsumer onRequestCall() {
			return null;
		}

		@Override
		public Runnable onCancelCall() {
			return null;
		}

		@Override
		public Object scanUnsafe(Attr key) {
			return null;
		}
	}
}