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Spring擴(kuò)展之基于HandlerMapping實(shí)現(xiàn)接口灰度發(fā)布實(shí)例

更新時(shí)間：2023年08月31日 08:32:39 作者：輕塵×

這篇文章主要介紹了Spring擴(kuò)展之基于HandlerMapping實(shí)現(xiàn)接口灰度發(fā)布實(shí)例,灰度發(fā)布是指在黑與白之間,能夠平滑過(guò)渡的一種發(fā)布方式,灰度發(fā)布可以保證整體系統(tǒng)的穩(wěn)定,在初始灰度的時(shí)候就可以發(fā)現(xiàn)、調(diào)整問(wèn)題,以保證其影響度,需要的朋友可以參考下

背景

面試經(jīng)常被問(wèn)到，你了解spring源碼嗎？有基于spring做過(guò)什么擴(kuò)展嗎？

除了PropertyPlaceholderConfigurer處理占位符(被說(shuō)爛了)還有其他的嗎？

看了springmvc的源碼，有了一個(gè)新的案例可講(吹)

基于HandlerMapping實(shí)現(xiàn)接口灰度發(fā)布

說(shuō)這個(gè)之前可以先鋪墊一下，將故事講的生動(dòng)一點(diǎn)，我們來(lái)簡(jiǎn)單模擬一下。

面試官：“簡(jiǎn)歷上說(shuō)你對(duì)spring源碼比較熟悉，能簡(jiǎn)單講講你對(duì)ioc、aop的理解嗎？”

張三：“ioc是……aop是……巴拉巴拉”

(背了一大段八股文，毫無(wú)新意，面試官面無(wú)表情，然后打斷張三，繼續(xù)問(wèn))

面試官：你說(shuō)對(duì)spring源碼很熟悉，有多熟悉，在實(shí)際開(kāi)發(fā)中有用過(guò)？擴(kuò)展過(guò)嗎？

張三：“有過(guò)呀，當(dāng)時(shí)有個(gè)系統(tǒng)，升級(jí)改動(dòng)比較大，對(duì)于同一批接口，老用戶和新用戶返回的數(shù)據(jù)不一樣，為了實(shí)現(xiàn)系統(tǒng)的最小化改動(dòng)，我當(dāng)時(shí)就用spring的HandlerMapping解決了這個(gè)問(wèn)題，前端訪問(wèn)的接口不變，只在參數(shù)中加一個(gè)接口版本號(hào)，就能實(shí)現(xiàn)灰度……，具體實(shí)現(xiàn)是這樣的”

實(shí)現(xiàn)方案

自定義注解

新增一個(gè)自定義注解，用來(lái)標(biāo)注接口的適配的版本號(hào)，默認(rèn)為1.0版本

package com.fast.alibaba.annotation;
import java.lang.annotation.*;
/**
 * 自定義版本號(hào)注解
 */
@Documented
@Target({ElementType.TYPE,ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ApiVersion {
    double value() default 1.0;
}

自定義HandleMapping

自定義HandleMapping，繼承spring家的HandleMapping，并重寫兩個(gè)getCustomTypeCondition方法

package com.fast.alibaba.handlemapping;
import com.fast.alibaba.annotation.ApiVersion;
import com.fast.alibaba.condition.ApiVersionRequestCondition;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.web.servlet.mvc.condition.RequestCondition;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
import java.lang.reflect.Method;
public class ApiVersionHandleMapping extends RequestMappingHandlerMapping {
    @Override
    protected RequestCondition<?> getCustomTypeCondition(Class<?> handlerType) {
        ApiVersion apiVersion = AnnotationUtils.getAnnotation(handlerType, ApiVersion.class);
        return new ApiVersionRequestCondition(apiVersion != null ? apiVersion.value() : 1.0);
    }
    @Override
    protected RequestCondition<?> getCustomMethodCondition(Method method) {
        ApiVersion apiVersion = AnnotationUtils.getAnnotation(method, ApiVersion.class);
        if(apiVersion == null){
            apiVersion = AnnotationUtils.getAnnotation(method.getDeclaringClass(), ApiVersion.class);
        }
        return new ApiVersionRequestCondition(apiVersion != null ? apiVersion.value() : 1.0);
    }
}

實(shí)現(xiàn)RequestCondition接口

以便識(shí)別前端傳送的版本與接口上注解版本匹配

package com.fast.alibaba.condition;
import com.alibaba.cloud.commons.lang.StringUtils;
import org.springframework.web.servlet.mvc.condition.RequestCondition;
import javax.servlet.http.HttpServletRequest;
public class ApiVersionRequestCondition implements RequestCondition<ApiVersionRequestCondition> {
    private double apiVersion = 1.0;
    private static final String VERSION_NAME = "api-version";
    public double getApiVersion() {
        return apiVersion;
    }
    public ApiVersionRequestCondition(double apiVersion){
        this.apiVersion=apiVersion;
    }
    @Override
    public ApiVersionRequestCondition combine(ApiVersionRequestCondition method) {
        return method;
    }
    @Override
    public int compareTo(ApiVersionRequestCondition other, HttpServletRequest request) {
        return Double.compare(other.getApiVersion(),this.getApiVersion());
    }
    @Override
    public ApiVersionRequestCondition getMatchingCondition(HttpServletRequest request) {
        double reqVersionDouble = 1.0;
        String reqVersion = request.getHeader(VERSION_NAME);
        if(StringUtils.isEmpty(reqVersion)){
            reqVersion = request.getParameter(VERSION_NAME);
        }
        if(!StringUtils.isEmpty(reqVersion)){
            reqVersionDouble = Double.parseDouble(reqVersion);
        }
        if(this.getApiVersion() == reqVersionDouble){
            return this;
        }
        return null;
    }
}

自定義WebMvcRegistrations

package com.fast.alibaba.register;
import com.fast.alibaba.handlemapping.ApiVersionHandleMapping;
import org.springframework.boot.autoconfigure.web.servlet.WebMvcRegistrations;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;
/**
 * 注冊(cè)自定義的 ApiVersionHandleMapping
 */
public class ApiVersionMappingRegister implements WebMvcRegistrations {
    @Override
    public RequestMappingHandlerMapping getRequestMappingHandlerMapping() {
        return new ApiVersionHandleMapping();
    }
}

注入WebMvcRegistrations

package com.fast.alibaba.config;
import com.fast.alibaba.register.ApiVersionMappingRegister;
import org.springframework.boot.autoconfigure.web.servlet.WebMvcRegistrations;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class BaseConfiguration {
    @Bean
    public WebMvcRegistrations getWebMvcRegistrations(){
        return new ApiVersionMappingRegister();
    }
}

測(cè)試類

package com.fast.alibaba.controller;
import com.fast.alibaba.annotation.ApiVersion;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class TestHandlerMappingController {
    @GetMapping("/getInfo")
    @ApiVersion(1.0)
    public String getSomeInfoByV1(){
        return "version 1.0";
    }
    @GetMapping("/getInfo")
    @ApiVersion(2.0)
    public String getSomeInfoByV2(){
        return "version 2.0";
    }
    @GetMapping("/getInfo")
    @ApiVersion(3.0)
    public String getSomeInfoByV3(){
        return "version 3.0";
    }
}

到此這篇關(guān)于Spring擴(kuò)展之基于HandlerMapping實(shí)現(xiàn)接口灰度發(fā)布實(shí)例的文章就介紹到這了,更多相關(guān)基于HandlerMapping實(shí)現(xiàn)接口灰度發(fā)布內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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