redis redisson 限流器的实例(RRateLimiter)

public interface RRateLimiter extends RRateLimiterAsync, RObject { 
    boolean trySetRate(RateType var1, long var2, long var4, RateIntervalUnit var6);
                              //设置访问速率，var2为访问数，var4为单位时间，var6为时间单位 
    void acquire();           //访问数据
    void acquire(long var1);  //占var1的速度计算值 
    boolean tryAcquire();                                    //尝试访问数据
    boolean tryAcquire(long var1);                           //尝试访问数据，占var1的速度计算值
    boolean tryAcquire(long var1, TimeUnit var3);            //尝试访问数据，设置等待时间var3
    boolean tryAcquire(long var1, long var3, TimeUnit var5); //尝试访问数据，占数据计算值var1，设置等待时间var3 
    RateLimiterConfig getConfig();
}

public enum RateType {
    OVERALL,             //所有客户端加总限流
    PER_CLIENT;          //每个客户端单独计算流量
 
    private RateType() {
    }
}

public enum RateIntervalUnit {
    MILLISECONDS {
        public long toMillis(long value) {
            return value;
        }
    },
    SECONDS {
        public long toMillis(long value) {
            return TimeUnit.SECONDS.toMillis(value);
        }
    },
    MINUTES {
        public long toMillis(long value) {
            return TimeUnit.MINUTES.toMillis(value);
        }
    },
    HOURS {
        public long toMillis(long value) {
            return TimeUnit.HOURS.toMillis(value);
        }
    },
    DAYS {
        public long toMillis(long value) {
            return TimeUnit.DAYS.toMillis(value);
        }
    };
 
    private RateIntervalUnit() {
    } 
    public abstract long toMillis(long var1);
}

public class MyTest8 { 
    public static void main(String[] args){
        Config config=new Config();
        config.useSingleServer().setAddress("redis://192.168.57.120:6379").setPassword("123456");
        RedissonClient client= Redisson.create(config);
 
        RRateLimiter rateLimiter=client.getRateLimiter("rate_limiter");
        rateLimiter.trySetRate(RateType.PER_CLIENT,5,2, RateIntervalUnit.MINUTES); 
        ExecutorService executorService= Executors.newFixedThreadPool(10);
        for (int i=0;i<10;i++){
            executorService.submit(()->{
               try{
                   rateLimiter.acquire();
                   System.out.println("线程"+Thread.currentThread().getId()+"进入数据区："+System.currentTimeMillis());
               }catch (Exception e){
                   e.printStackTrace();
               }
            });
        }
    }
}

// 1、 声明一个限流器
RRateLimiter rateLimiter = redissonClient.getRateLimiter(key);
 
// 2、 设置速率，5秒中产生3个令牌
rateLimiter.trySetRate(RateType.OVERALL, 3, 5, RateIntervalUnit.SECONDS);
 
// 3、试图获取一个令牌，获取到返回true
rateLimiter.tryAcquire(1)

// 声明一个限流器 名称 叫key
redissonClient.getRateLimiter(key)

@Override
    public RFuture<Boolean> trySetRateAsync(RateType type, long rate, long rateInterval, RateIntervalUnit unit) {
        return commandExecutor.evalWriteAsync(getName(), LongCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN,
                "redis.call('hsetnx', KEYS[1], 'rate', ARGV[1]);"
              + "redis.call('hsetnx', KEYS[1], 'interval', ARGV[2]);"
              + "return redis.call('hsetnx', KEYS[1], 'type', ARGV[3]);",
                Collections.<Object>singletonList(getName()), rate, unit.toMillis(rateInterval), type.ordinal());
    }

trySetRate(RateType.OVERALL, 3, 5, RateIntervalUnit.SECONDS);

private <T> RFuture<T> tryAcquireAsync(RedisCommand<T> command, Long value) {
        return commandExecutor.evalWriteAsync(getName(), LongCodec.INSTANCE, command,
                "local rate = redis.call('hget', KEYS[1], 'rate');"  //1
              + "local interval = redis.call('hget', KEYS[1], 'interval');"  //2
              + "local type = redis.call('hget', KEYS[1], 'type');" //3
              + "assert(rate ~= false and interval ~= false and type ~= false, 'RateLimiter is not initialized')" //4
              
              + "local valueName = KEYS[2];" //5
              + "if type == 1 then "
                  + "valueName = KEYS[3];" //6
              + "end;"
              
              + "local currentValue = redis.call('get', valueName); " //7
              + "if currentValue ~= false then " 
                     + "if tonumber(currentValue) < tonumber(ARGV[1]) then " //8
                         + "return redis.call('pttl', valueName); "
                     + "else "
                         + "redis.call('decrby', valueName, ARGV[1]); " //9
                         + "return nil; "
                     + "end; "
              + "else " //10
                     + "redis.call('set', valueName, rate, 'px', interval); " 
                     + "redis.call('decrby', valueName, ARGV[1]); "
                     + "return nil; "
              + "end;",
                Arrays.<Object>asList(getName(), getValueName(), getClientValueName()), 
                value, commandExecutor.getConnectionManager().getId().toString());
    }

String getClientValueName() {
        return suffixName(getValueName(), commandExecutor.getConnectionManager().getId().toString());
   }

public interface ConnectionManager {    
    UUID getId(); 
    省略...
}