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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) 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.scheduler;

import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;

import reactor.core.Disposable;
import reactor.core.Scannable;

/**
 * This {@link BoundedElasticThreadPerTaskScheduler} variant is included when Reactor is
 * used with JDK versions lower than 21, and all methods raise an
 * {@link UnsupportedOperationException}. An alternative variant is available for use on
 * JDK 21+ where virtual threads are supported.
 */
final class BoundedElasticThreadPerTaskScheduler
		implements Scheduler, SchedulerState.DisposeAwaiter, Scannable {

	BoundedElasticThreadPerTaskScheduler(int maxThreads, int maxTaskQueuedPerThread, ThreadFactory factory) {
		throw new UnsupportedOperationException("Unsupported in JDK lower than 21");
	}

	@Override
	public boolean await(BoundedServices resource, long timeout, TimeUnit timeUnit)
			throws InterruptedException {
		return false;
	}

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

	@Override
	public Disposable schedule(Runnable task) {
		throw new UnsupportedOperationException("Unsupported in JDK lower than 21");
	}

	@Override
	public Worker createWorker() {
		throw new UnsupportedOperationException("Unsupported in JDK lower than 21");
	}

	static final class BoundedServices {
		private BoundedServices() {

		}

		BoundedServices(BoundedElasticThreadPerTaskScheduler parent) {}
	}
}