GrpcServerConfigurer 和 GrpcServerProperties 中的 keepAliveTime 有什么区别？

[Ador-able]

Grpc 服务端配置器允许您将自定义配置添加到 gRPC 的 ServerBuilder。

    @Bean
    public GrpcServerConfigurer keepAliveServerConfigurer() {
        return serverBuilder -> {
            if (serverBuilder instanceof NettyServerBuilder) {
                ((NettyServerBuilder) serverBuilder)
                        .keepAliveTime(30, TimeUnit.SECONDS)
                        .keepAliveTimeout(5, TimeUnit.SECONDS)
                        .permitKeepAliveWithoutCalls(true);
            }
        };
    }

这里的 keepAliveTime 和 GrpcServerProperties 中的 keepAliveTime 有什么区别么 ？
设置了这个是否还有必要设置 GrpcServerProperties 中的 keepAliveTime ？

[ST-DDT]

The main difference is the order they are applied:

grpc-spring/grpc-server-spring-boot-starter/src/main/java/net/devh/boot/grpc/server/serverfactory/AbstractGrpcServerFactory.java

Lines 83 to 92 in a18aeeb

	protected void configure(final T builder) {
	configureServices(builder);
	configureKeepAlive(builder);
	configureConnectionLimits(builder);
	configureSecurity(builder);
	configureLimits(builder);
	for (final GrpcServerConfigurer serverConfigurer : this.serverConfigurers) {
	serverConfigurer.accept(builder);
	}
	}

grpc-spring/grpc-server-spring-boot-starter/src/main/java/net/devh/boot/grpc/server/serverfactory/NettyGrpcServerFactory.java

Lines 99 to 106 in a18aeeb

	protected void configureKeepAlive(final NettyServerBuilder builder) {
	if (this.properties.isEnableKeepAlive()) {
	builder.keepAliveTime(this.properties.getKeepAliveTime().toNanos(), TimeUnit.NANOSECONDS)
	.keepAliveTimeout(this.properties.getKeepAliveTimeout().toNanos(), TimeUnit.NANOSECONDS);
	}
	builder.permitKeepAliveTime(this.properties.getPermitKeepAliveTime().toNanos(), TimeUnit.NANOSECONDS)
	.permitKeepAliveWithoutCalls(this.properties.isPermitKeepAliveWithoutCalls());
	}

Your example GrpcServerConfigurer only works with NettyServerBuilder (and not with ShadedNettyServerBuilder).
The properties work for both.

GrpcServerConfigurer take precedence over any configuration.