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Redis Java client with features of In-Memory Data Grid
There is a newer version: 3.45.1
/**
 * Copyright (c) 2013-2021 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.executor;

import org.redisson.RedissonExecutorService;
import org.redisson.api.RFuture;
import org.redisson.client.codec.Codec;
import org.redisson.client.codec.LongCodec;
import org.redisson.client.codec.StringCodec;
import org.redisson.client.protocol.RedisCommands;
import org.redisson.command.CommandAsyncExecutor;
import org.redisson.executor.params.ScheduledParameters;
import org.redisson.remote.RemoteServiceRequest;
import org.redisson.remote.RequestId;
import org.redisson.remote.ResponseEntry;

import java.util.Arrays;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ThreadLocalRandom;

/**
 * 
 * @author Nikita Koksharov
 *
 */
public class ScheduledTasksService extends TasksService {

    private RequestId requestId;
    
    public ScheduledTasksService(Codec codec, String name, CommandAsyncExecutor commandExecutor, String redissonId, ConcurrentMap responses) {
        super(codec, name, commandExecutor, redissonId, responses);
    }
    
    public void setRequestId(RequestId requestId) {
        this.requestId = requestId;
    }
    
    @Override
    protected RFuture addAsync(String requestQueueName, RemoteServiceRequest request) {
        ScheduledParameters params = (ScheduledParameters) request.getArgs()[0];
        params.setRequestId(request.getId());

        long expireTime = 0;
        if (params.getTtl() > 0) {
            expireTime = System.currentTimeMillis() + params.getTtl();
        }

        return commandExecutor.evalWriteAsync(name, LongCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN,
                // check if executor service not in shutdown state
                "if redis.call('exists', KEYS[2]) == 0 then "
                    + "local retryInterval = redis.call('get', KEYS[6]); "
                    + "if retryInterval ~= false then "
                        + "local time = tonumber(ARGV[1]) + tonumber(retryInterval);"
                        + "redis.call('zadd', KEYS[3], time, 'ff' .. ARGV[2]);"
                    + "elseif tonumber(ARGV[4]) > 0 then "
                        + "redis.call('set', KEYS[6], ARGV[4]);"
                        + "local time = tonumber(ARGV[1]) + tonumber(ARGV[4]);"
                        + "redis.call('zadd', KEYS[3], time, 'ff' .. ARGV[2]);"
                    + "end; "

                    + "if tonumber(ARGV[5]) > 0 then "
                        + "redis.call('zadd', KEYS[7], ARGV[5], ARGV[2]);"
                    + "end; "

                    + "redis.call('zadd', KEYS[3], ARGV[1], ARGV[2]);"
                    + "redis.call('hset', KEYS[5], ARGV[2], ARGV[3]);"
                    + "redis.call('incr', KEYS[1]);"
                    + "local v = redis.call('zrange', KEYS[3], 0, 0); "
                    // if new task added to queue head then publish its startTime 
                    // to all scheduler workers 
                    + "if v[1] == ARGV[2] then "
                       + "redis.call('publish', KEYS[4], ARGV[1]); "
                    + "end "
                    + "return 1;"
                + "end;"
                + "return 0;", 
                Arrays.asList(tasksCounterName, statusName, schedulerQueueName,
                        schedulerChannelName, tasksName, tasksRetryIntervalName, tasksExpirationTimeName),
                params.getStartTime(), request.getId(), encode(request), tasksRetryInterval, expireTime);
    }
    
    @Override
    protected RFuture removeAsync(String requestQueueName, RequestId taskId) {
        return commandExecutor.evalWriteAsync(name, StringCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN,
                   // remove from scheduler queue
                    "if redis.call('exists', KEYS[3]) == 0 then "
                      + "return 1;"
                  + "end;"
                      
                  + "local task = redis.call('hget', KEYS[6], ARGV[1]); "
                  + "redis.call('hdel', KEYS[6], ARGV[1]); "
                  
                  + "redis.call('zrem', KEYS[2], 'ff' .. ARGV[1]); "
                  + "local removedScheduled = redis.call('zrem', KEYS[2], ARGV[1]); "
                  + "local removed = redis.call('lrem', KEYS[1], 1, ARGV[1]); "

                  // remove from executor queue
                  + "if task ~= false and (removed > 0 or removedScheduled > 0) then "
                      + "if redis.call('decr', KEYS[3]) == 0 then "
                         + "redis.call('del', KEYS[3]);"
                         + "if redis.call('get', KEYS[4]) == ARGV[2] then "
                            + "redis.call('del', KEYS[7]);"
                            + "redis.call('set', KEYS[4], ARGV[3]);"
                            + "redis.call('publish', KEYS[5], ARGV[3]);"
                         + "end;"
                      + "end;"
                      + "return 1;"
                  + "end;"
                  + "if task == false then "
                      + "return 1; "
                  + "end;"
                  + "return 0;",
              Arrays.