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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) 2013-2024 Nikita Koksharov
 *
 * 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 org.redisson.api;

import java.util.List;

/**
 * {@link java.util.Queue} backed by Redis
 *
 * @author Nikita Koksharov
 *
 * @param  the type of elements held in this collection
 */
public interface RQueueAsync extends RCollectionAsync {

    /**
     * Retrieves the head of this queue in async mode.
     * 
     * @return the head of this queue, or {@code null}
     */
    RFuture peekAsync();

    /**
     * Retrieves and removes the head of this queue in async mode.
     *
     * @return the head of this queue, or {@code null}
     */
    RFuture pollAsync();

    /**
     * Inserts the specified element into this queue.
     *
     * @param e the element to add
     * @return {@code true} if successful, or {@code false}
     * @throws ClassCastException if the class of the specified element
     *         prevents it from being added to this queue
     * @throws NullPointerException if the specified element is null
     */
    RFuture offerAsync(V e);

    /**
     * Retrieves and removes last available tail element of this queue queue and adds it at the head of queueName.
     *
     * @param queueName - names of destination queue
     * @return the tail of this queue, or {@code null} if the
     *         specified waiting time elapses before an element is available
     */
    RFuture pollLastAndOfferFirstToAsync(String queueName);

    /**
     * Returns all queue elements at once
     * 
     * @return elements
     */
    RFuture> readAllAsync();

    /**
     * Retrieves and removes the head elements of this queue.
     * Elements amount limited by limit param.
     *
     * @return list of head elements
     */
    RFuture> pollAsync(int limit);

    /**
     * Adds object event listener
     *
     * @see org.redisson.api.listener.TrackingListener
     * @see org.redisson.api.ExpiredObjectListener
     * @see org.redisson.api.DeletedObjectListener
     * @see org.redisson.api.listener.ListAddListener
     * @see org.redisson.api.listener.ListInsertListener
     * @see org.redisson.api.listener.ListSetListener
     * @see org.redisson.api.listener.ListRemoveListener
     * @see org.redisson.api.listener.ListTrimListener
     *
     * @param listener - object event listener
     * @return listener id
     */
    RFuture addListenerAsync(ObjectListener listener);

}