spring-boot - 配置 Spring WebFlux WebClient 以使用自定义线程池

Question

是否可以将 WebClient 配置为使用 reactor-http-nio 线程池以外的自定义线程池（使用 Netty 时）？如果可能的话，我们能否以某种方式限制该自定义线程池仅在特定处理器内核上运行？

Answer 1

是的。你可以。

1. 在你自己的线程池和 EventLoopGroup 中创建一些（或创建 NioEventLoopGroup bean）。例如：

   {
    Intger THREADS = 10;
   
    BasicThreadFactory THREADFACTORY = new BasicThreadFactory.Builder()
           .namingPattern("HttpThread-%d")
           .daemon(true)
           .priority(Thread.MAX_PRIORITY)
           .build();
   
    EXECUTOR = new ThreadPoolExecutor(
           THREADS,
           THREADS,
           0L,
           TimeUnit.MILLISECONDS,
           new LinkedBlockingQueue<>(),
           THREADFACTORY,
           new ThreadPoolExecutor.AbortPolicy());
   
    NioEventLoopGroup RESOURCE= new NioEventLoopGroup(THREADS,EXECUTOR);
   }
   

2. 注册你自己的 ReactorResourceFactory。并提供自己的基于自定义线程Executor的EventLoopGrooup

   @Bean
   public ReactorResourceFactory reactorResourceFactory(NioEventLoopGroup RESOURCE) {
       ReactorResourceFactory f= new ReactorResourceFactory();
       f.setLoopResources(new LoopResources() {
           @Override
            public EventLoopGroup onServer(boolean b) {
                return RESOURCE;
               }
           });
       f.setUseGlobalResources(false);
       return f;
   }
   

3. 然后注册 ReactorClientHttpConnector。在下面的示例中，它使用了自定义 SSL 上下文

   @Bean
   public ReactorClientHttpConnector reactorClientHttpConnector(ReactorResourceFactory r) throws SSLException {
       SslContext sslContext = SslContextBuilder
           .forClient()
           .trustManager(InsecureTrustManagerFactory.INSTANCE)
           .build();
       return new ReactorClientHttpConnector(r, m -> m.secure(t -> t.sslContext(sslContext)));
   }
   

4. 最后构建 WebClient

   @Bean
   public WebClient webClient(ReactorClientHttpConnector r) {
       return WebClient.builder().clientConnector(r).build();
   }
   

如果你想对 WebServer 使用相同的。对 ReactiveWebServerFactory 进行相同的配置。

    @Bean
    public ReactiveWebServerFactory reactiveWebServerFactory(NioEventLoopGroup RESOURCE) {
        NettyReactiveWebServerFactory factory = new NettyReactiveWebServerFactory();
        factory.addServerCustomizers(hs->hs.tcpConfiguration(s->s.runOn(RESOURCE)));
        return factory;
    }

进口：

    import io.netty.channel.EventLoopGroup;
    import io.netty.channel.nio.NioEventLoopGroup;
    import io.netty.handler.ssl.SslContext;
    import io.netty.handler.ssl.SslContextBuilder;
    import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.DependsOn;
    import org.springframework.http.client.reactive.ReactorClientHttpConnector;
    import org.springframework.http.client.reactive.ReactorResourceFactory;
    import org.springframework.stereotype.Component;
    import org.springframework.web.reactive.function.client.WebClient;
    import reactor.netty.resources.LoopResources;
    import org.apache.commons.lang3.concurrent.BasicThreadFactory;
    import org.springframework.boot.web.embedded.netty.NettyReactiveWebServerFactory;
    import org.springframework.boot.web.reactive.server.ReactiveWebServerFactory;
    import java.util.concurrent.*;