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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;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.TimeUnit;

import org.redisson.api.RFuture;
import org.redisson.api.RRingBuffer;
import org.redisson.api.RedissonClient;
import org.redisson.client.codec.Codec;
import org.redisson.client.codec.LongCodec;
import org.redisson.client.protocol.RedisCommands;
import org.redisson.client.protocol.RedisStrictCommand;
import org.redisson.client.protocol.convertor.IntegerReplayConvertor;
import org.redisson.command.CommandAsyncExecutor;
import org.redisson.misc.CompletableFutureWrapper;

/**
 * 
 * @author Nikita Koksharov
 *
 * @param  value type
 */
public class RedissonRingBuffer extends RedissonQueue implements RRingBuffer {

    private static final RedisStrictCommand GET_INTEGER = new RedisStrictCommand("GET", new IntegerReplayConvertor(0));
    
    private final String settingsName;
    
    public RedissonRingBuffer(CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson) {
        super(commandExecutor, name, redisson);
        settingsName = prefixName("redisson_rb", getRawName());
    }
    
    public RedissonRingBuffer(Codec codec, CommandAsyncExecutor commandExecutor, String name, RedissonClient redisson) {
        super(codec, commandExecutor, name, redisson);
        settingsName = prefixName("redisson_rb", getRawName());
    }

    @Override
    public RFuture trySetCapacityAsync(int capacity) {
        return commandExecutor.writeAsync(getRawName(), LongCodec.INSTANCE, RedisCommands.SETNX, settingsName, capacity);
    }
    
    @Override
    public boolean trySetCapacity(int capacity) {
        return get(trySetCapacityAsync(capacity));
    }

    @Override
    public RFuture setCapacityAsync(int capacity) {
        return commandExecutor.evalWriteAsync(getRawName(), LongCodec.INSTANCE, RedisCommands.EVAL_VOID,
                "redis.call('set', KEYS[2], ARGV[1]); " +
                        "local len = redis.call('llen', KEYS[1]); " +
                        "if len > tonumber(ARGV[1]) then " +
                            "redis.call('ltrim', KEYS[1], len - tonumber(ARGV[1]), -1); " +
                        "end; ",
             Arrays.asList(getRawName(), settingsName), capacity);
    }

    @Override
    public void setCapacity(int capacity) {
        get(setCapacityAsync(capacity));
    }

    @Override
    public RFuture addAsync(V e) {
        return commandExecutor.evalWriteNoRetryAsync(getRawName(), LongCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN,
                "local limit = redis.call('get', KEYS[2]); "
              + "assert(limit ~= false, 'RingBuffer capacity is not defined'); "
              + "local size = redis.call('rpush', KEYS[1], ARGV[1]); "
              
              + "if size > tonumber(limit) then "
                  + "redis.call('lpop', KEYS[1]); "
              + "end; "
              + "return 1; ",
             Arrays.asList(getRawName(), settingsName), encode(e));
    }

    @Override
    public RFuture addAllAsync(Collection c) {
        if (c.isEmpty()) {
            return new CompletableFutureWrapper<>(false);
        }

        List