spring-boot - 如何在spring boot 2中配置netty

Question

默认情况下，spring web Flux 使用 netty，它是单线程事件循环。如何配置 Spring Boot 以便为每个核心创建一个线程。

谢谢，

洛克什

Answer 1

如Spring Boot 参考文档中所述，您可以使用NettyServerCustomizer.

这是 Spring Boot 2.1 的示例：

@Component
public class MyNettyWebServerCustomizer
        implements WebServerFactoryCustomizer<NettyReactiveWebServerFactory> {

    @Override
    public void customize(NettyReactiveWebServerFactory factory) {
        factory.addServerCustomizers(new EventLoopNettyCustomizer());
    }
}

class EventLoopNettyCustomizer implements NettyServerCustomizer {

    @Override
    public HttpServer apply(HttpServer httpServer) {
        EventLoopGroup eventLoopGroup = //...;
        return httpServer.tcpConfiguration(tcpServer ->
                tcpServer.bootstrap(serverBootstrap
                        -> serverBootstrap.group(eventLoopGroup)));
    }
}

Answer 2

您可以更改依赖项：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <!-- Exclude the Tomcat dependency -->
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<!-- Use Jetty instead -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jetty</artifactId>
</dependency>

https://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-web-servers.html