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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;

/**
 * RingBuffer based queue evicts elements from the head if queue capacity became full.
 * 
 * The head element removed if new element added and queue is full. 
 * 
 * Must be initialized with capacity size {@link #trySetCapacity(int)} before usage.
 * 
 * @author Nikita Koksharov
 *
 * @param  value type
 */
public interface RRingBuffer extends RQueue, RRingBufferAsync {

    /**
     * Sets capacity of the queue only if it wasn't set before.
     *
     * @param capacity - queue capacity
     * @return true if capacity set successfully
     *         false if capacity already set
     */
    boolean trySetCapacity(int capacity);

    /**
     * Sets capacity of the queue and overrides current value.
     * Trims queue if previous capacity value was greater than new.
     *
     * @param capacity - queue capacity
     */
    void setCapacity(int capacity);

    /**
     * Returns remaining capacity of this queue
     * 
     * @return remaining capacity
     */
    int remainingCapacity();   

    /**
     * Returns capacity of this queue
     * 
     * @return queue capacity
     */
    int capacity();
}