Spring Integration 5.0 + Project Reactor:控制线程

问题描述

https://stackoverflow.com/a/47136941/1776585

在使用 Flux + split() + FluxMessageChannel 时，我无法让我的集成处理程序在并行线程中运行.

I can't make my integration handler to run in parallel threads while using Flux + split() + FluxMessageChannel.

考虑以下片段:

// ...
.handle(message -> Flux.range(0, 10)
    .doOnNext(i -> LOG.info("> " + i))
    .subscribeOn(Schedulers.parallel()))
.split()
.channel(new FluxMessageChannel())
.handle(message -> LOG.info(" -> " + message.getPayload())))
// ...

所有日志都在一个线程中输出:

All logs are output in one thread:

[     parallel-1] d.a.Application    : > 0
[     parallel-1] d.a.Application    :  -> 0
[     parallel-1] d.a.Application    : > 1
[     parallel-1] d.a.Application    :  -> 1
[     parallel-1] d.a.Application    : > 2
[     parallel-1] d.a.Application    :  -> 2
[     parallel-1] d.a.Application    : > 3
[     parallel-1] d.a.Application    :  -> 3
[     parallel-1] d.a.Application    : > 4
[     parallel-1] d.a.Application    :  -> 4
[     parallel-1] d.a.Application    : > 5
[     parallel-1] d.a.Application    :  -> 5
[     parallel-1] d.a.Application    : > 6
[     parallel-1] d.a.Application    :  -> 6
[     parallel-1] d.a.Application    : > 7
[     parallel-1] d.a.Application    :  -> 7
[     parallel-1] d.a.Application    : > 8
[     parallel-1] d.a.Application    :  -> 8
[     parallel-1] d.a.Application    : > 9
[     parallel-1] d.a.Application    :  -> 9

如何强制多线程处理?

我已经尝试在 Flux 上使用 .parallel().runOn()，但这只是使获取数据并行，但实际处理仍然在一个线程上运行.

I've tried using .parallel().runOn() on the Flux, but that just makes fetching data parallel, but actual handling still runs on one thread.

我也试过 .publishOn(Schedulers.parallel()) 在 Flux 上没有效果.

I've also tried .publishOn(Schedulers.parallel()) on the Flux with no effect.

并且将 ExecutorChannel 或带有执行程序的 Poller 添加到处理程序也无济于事.

And also adding ExecutorChannel or a Poller with an executor to a handler didn't help.

推荐答案

这有一些技巧:

.channel(new FluxMessageChannel())
.channel(MessageChannels.executor(Executors.newCachedThreadPool()))
.handle(message -> LOG.info(" -> " + message.getPayload())))

FluxMessageChannel 使用的那些消息将与额外的 ExecutorChannel 并行.

And those messages consumed by the FluxMessageChannel is going to be paralled by that additional ExecutorChannel.

我认为您要问的是一个功能请求，可以使提到的 FluxMessageChannel 可配置.并且可以在那里配置这样的 subscribeOn/publishOn 等.

I think what you are asking is like a feature request to make the mentioned FluxMessageChannel configurable. And such a subscribeOn/publishOn etc. could be configured there.

请随时就此事提出JIRA！

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