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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) 2016-2021 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 java.util.concurrent.TimeUnit;

import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.core.Fuseable;
import reactor.core.scheduler.Scheduler;
import reactor.util.annotation.Nullable;
import reactor.util.function.Tuple2;
import reactor.util.function.Tuples;

/**
 * @author Stephane Maldini
 */
final class FluxElapsed extends InternalFluxOperator> implements Fuseable {

	final Scheduler scheduler;

	FluxElapsed(Flux source, Scheduler scheduler) {
		super(source);
		this.scheduler = scheduler;
	}

	@Override
	public CoreSubscriber subscribeOrReturn(CoreSubscriber> actual) {
		return new ElapsedSubscriber<>(actual, scheduler);
	}

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

		return super.scanUnsafe(key);
	}

	static final class ElapsedSubscriber
			implements InnerOperator>,
			           QueueSubscription> {

		final CoreSubscriber> actual;
		final Scheduler                               scheduler;

		Subscription      s;
		QueueSubscription qs;

		long lastTime;

		ElapsedSubscriber(CoreSubscriber> actual,
				Scheduler scheduler) {
			this.actual = actual;
			this.scheduler = scheduler;
		}

		@Override
		@Nullable
		public Object scanUnsafe(Attr key) {
			if (key == Attr.PARENT) return s;
			if (key == Attr.RUN_ON) return scheduler;
			if (key == Attr.RUN_STYLE) return Attr.RunStyle.SYNC;

			return InnerOperator.super.scanUnsafe(key);
		}

		@Override
		public void onSubscribe(Subscription s) {
			if (Operators.validate(this.s, s)) {
				lastTime = scheduler.now(TimeUnit.MILLISECONDS);
				this.s = s;
				actual.onSubscribe(this);
			}
		}

		@Override
		public CoreSubscriber> actual() {
			return actual;
		}

		@Override
		public void onNext(T t) {
			if(t == null){
				actual.onNext(null);
				return;
			}
			actual.onNext(snapshot(t));
		}

		@Override
		public void onError(Throwable t) {
			actual.onError(t);
		}

		@Override
		public void onComplete() {
			actual.onComplete();
		}

		@Override
		public void request(long n) {
			s.request(n);
		}

		@Override
		public void cancel() {
			s.cancel();
		}

		@Override
		public int requestFusion(int requestedMode) {
			QueueSubscription qs = Operators.as(s);
			if (qs != null) {
				this.qs = qs;
				return qs.requestFusion(requestedMode);
			}
			return Fuseable.NONE;
		}

		Tuple2 snapshot(T data){
			long now = scheduler.now(TimeUnit.MILLISECONDS);
			long last = lastTime;
			lastTime = now;
			long delta = now - last;
			return Tuples.of(delta, data);
		}

		@Override
		@Nullable
		public Tuple2 poll() {
			T data = qs.poll();
			if(data != null){
				return snapshot(data);
			}
			return null;
		}

		@Override
		public int size() {
			return qs.size();
		}

		@Override
		public boolean isEmpty() {
			return qs.isEmpty();
		}

		@Override
		public void clear() {
			qs.clear();
		}
	}
}