Use of feign (Part 2)

🧁Java Code configuration

It can also be based on Java Code to modify the log level , Foretell a class , Then declare a Logger.Level The object of ：

public class DefaultFeignConfiguration  {    @Bean    public Logger.Level feignLogLevel(){        return Logger.Level.BASIC; //  Log level is BASIC    }}

If you want to Global effect , Put it in the... Of the startup class @EnableFeignClients In this note ：

@EnableFeignClients(defaultConfiguration = DefaultFeignConfiguration .class) 

If it is Partial effect , Then put it in the corresponding @FeignClient In this note ：

@FeignClient(value = "userservice", configuration = DefaultFeignConfiguration .class) 

Feign Tuning of

Feign Performance tuning book ⾝ Very good performance ⾼, But you can still optimize .

feign The underlying client implementation ：

URLConnection： Default implementation , Connection pooling is not supported

Apche HttpClient: Support connection pool

OKHttp: Support connection pool

So optimize feign The performance of

1. Use the connection pool instead of the default connection pool URLConnection

2. The level of logging ： meanwhile ⽇ The level of ambition is different , The performance consumed is also different , Use as much as possible Basic Level or none

You can make ⽤Apche HttpClient or OKHttp Into the ⾏ Optimize

Feign Bottom layer initiation http request , Rely on other frameworks . Its underlying client implementation includes ：

•URLConnection： Default implementation , Connection pooling is not supported

•Apache HttpClient ： Support connection pool

•OKHttp： Support connection pool

So improve Feign The main means of performance is to use Connection pool Instead of default URLConnection.

Here we use Apache Of HttpClient To demonstrate .

First step Introduce dependencies

stay order-service Of pom Introduce in the file Apache Of HttpClient rely on ：

<!--httpClient Dependence  --><dependency>    <groupId>io.github.openfeign</groupId>    <artifactId>feign-httpclient</artifactId></dependency>

2） Configure connection pool

stay order-service Of application.yml Add configuration in ：

feign:  client:    config:      default: # default Global configuration         loggerLevel: BASIC #  The level of logging ,BASIC Is the basic request and response information   httpclient:    enabled: true #  Turn on feign Yes HttpClient Support for     max-connections: 200 #  Maximum number of connections     max-connections-per-route: 50 #  Maximum number of connections per path 

stay FeignClientFactoryBean Medium loadBalance Break in the method , and Debug Mode start order-service service , The bottom is Apache HttpClient.

1. Try to use the log level basic

2. Use HttpClient or OKHttp Instead of URLConnection

① introduce feign-httpClient rely on

② Profile on httpClient function , Set connection pool parameters

This is the end of the article , If you have any questions, please point out
Thank you again for your support