Question

我正在研究Flux和Mono，并在多线程环境中使用它们并使用提供工作线程的Schedular。

使用elastic，parallel和newElastic启动Schedular有很多选项。

以下是我使用的代码：

    System.out.println("------ elastic ---------  ");
    Flux.range(1, 10)
      .map(i -> i / 2)
      .publishOn(Schedulers.elastic()).log()
      .blockLast();

    System.out.println("------ new elastic ---------  ");
    Flux.range(1, 10)
      .map(i -> i / 2).log()
      .publishOn(Schedulers.newElastic("my")).log()
      .blockLast();

并且两者都有相同的文档：

调度程序，它动态创建基于ExecutorService的Worker并缓存线程池，一旦关闭了Workers，就重新使用它们。

创建的线程池的最大数量是无限制的。

未使用的线程池的默认生存时间为60秒，使用适当的工厂来推送不同的值。

此调度程序无法重新启动。

以下是两者的日志：

------ elastic ---------  
[ INFO] (main) | onSubscribe([Fuseable] FluxPublishOn.PublishOnSubscriber)
[ INFO] (main) | request(unbounded)
[ INFO] (elastic-2) | onNext(0)
[ INFO] (elastic-2) | onNext(1)
[ INFO] (elastic-2) | onNext(1)
[ INFO] (elastic-2) | onNext(2)
[ INFO] (elastic-2) | onNext(2)
[ INFO] (elastic-2) | onNext(3)
[ INFO] (elastic-2) | onNext(3)
[ INFO] (elastic-2) | onNext(4)
[ INFO] (elastic-2) | onNext(4)
[ INFO] (elastic-2) | onNext(5)
[ INFO] (elastic-2) | onComplete()
------ new elastic ---------  
[ INFO] (main) | onSubscribe([Fuseable] FluxMapFuseable.MapFuseableSubscriber)
[ INFO] (main) | onSubscribe([Fuseable] FluxPublishOn.PublishOnSubscriber)
[ INFO] (main) | request(unbounded)
[ INFO] (main) | request(256)
[ INFO] (main) | onNext(0)
[ INFO] (main) | onNext(1)
[ INFO] (my-4) | onNext(0)
[ INFO] (main) | onNext(1)
[ INFO] (my-4) | onNext(1)
[ INFO] (main) | onNext(2)
[ INFO] (my-4) | onNext(1)
[ INFO] (my-4) | onNext(2)
[ INFO] (main) | onNext(2)
[ INFO] (main) | onNext(3)
[ INFO] (my-4) | onNext(2)
[ INFO] (main) | onNext(3)
[ INFO] (my-4) | onNext(3)
[ INFO] (my-4) | onNext(3)
[ INFO] (main) | onNext(4)
[ INFO] (my-4) | onNext(4)
[ INFO] (main) | onNext(4)
[ INFO] (main) | onNext(5)
[ INFO] (my-4) | onNext(4)
[ INFO] (main) | onComplete()
[ INFO] (my-4) | onNext(5)
[ INFO] (my-4) | onComplete()

两者有什么区别？

Answer 1

elastic()函数返回共享调度程序实例。这意味着对此函数的多次调用将返回相同的调度程序。

前缀为new的函数将始终创建一个新的调度程序实例。

在此处查看Schedulers课程的文档：https://projectreactor.io/docs/core/release/api/

Schedulers.newElastic和Schedulers.elastic方法之间有什么区别？

1 个答案: