spring react_使用Spring WebFlux构建React性REST API

spring react_使用Spring WebFlux构建React性REST API –第3部分

spring react

在上一篇文章的续篇中，我们将看到一个应用程序以公开React性REST API。在此应用程序中，我们使用了

带有WebFlux的Spring Boot
具有响应式支持的Cassandra的Spring数据
卡桑德拉数据库

下面是应用程序的高级体系结构。

让我们看一下build.gradle文件，以查看与Spring WebFlux一起使用的依赖项。

plugins {id 'org.springframework.boot' version '2.2.6.RELEASE'id 'io.spring.dependency-management' version '1.0.9.RELEASE'id 'java'
}group = 'org.smarttechie'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'repositories {mavenCentral()
}dependencies {implementation 'org.springframework.boot:spring-boot-starter-data-cassandra-reactive'implementation 'org.springframework.boot:spring-boot-starter-webflux'testImplementation('org.springframework.boot:spring-boot-starter-test') {exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'}testImplementation 'io.projectreactor:reactor-test'
}test {useJUnitPlatform()
}

在此应用程序中，我公开了以下提到的API。您可以从GitHub下载源代码。

终点	URI	响应
创建产品	/产品	创建产品为Mono
所有产品	/产品	以Flux的形式返回所有产品
发售产品	/ product / {id}	单核细胞增多症
更新产品	/ product / {id}	将产品更新为Mono

具有上述所有端点的产品控制器代码如下。

package org.smarttechie.controller;import org.smarttechie.model.Product;
import org.smarttechie.repository.ProductRepository;
import org.smarttechie.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;@RestController
public class ProductController {@Autowiredprivate ProductService productService;/*** This endpoint allows to create a product.* @param product - to create* @return - the created product*/@PostMapping("/product")@ResponseStatus(HttpStatus.CREATED)public Mono<Product> createProduct(@RequestBody Product product){return productService.save(product);}/*** This endpoint gives all the products* @return - the list of products available*/@GetMapping("/products")public Flux<Product> getAllProducts(){return productService.getAllProducts();}/*** This endpoint allows to delete a product* @param id - to delete* @return*/@DeleteMapping("/product/{id}")public Mono<Void> deleteProduct(@PathVariable int id){return productService.deleteProduct(id);}/*** This endpoint allows to update a product* @param product - to update* @return - the updated product*/@PutMapping("product/{id}")public Mono<ResponseEntity<Product>> updateProduct(@RequestBody Product product){return productService.update(product);}
}

在构建React式API时，我们可以使用功能样式编程模型来构建API，而无需使用RestController。在这种情况下，我们需要具有一个路由器和一个处理程序组件，如下所示。

package org.smarttechie.router;import org.smarttechie.handler.ProductHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.RouterFunctions;
import org.springframework.web.reactive.function.server.ServerResponse;
import static org.springframework.web.reactive.function.server.RequestPredicates.*;
@Configuration
public class ProductRouter {/*** The router configuration for the product handler.* @param productHandler* @return*/@Beanpublic RouterFunction<ServerResponse> productsRoute(ProductHandler productHandler){return RouterFunctions.route(GET("/products").and(accept(MediaType.APPLICATION_JSON)),productHandler::getAllProducts).andRoute(POST("/product").and(accept(MediaType.APPLICATION_JSON)),productHandler::createProduct).andRoute(DELETE("/product/{id}").and(accept(MediaType.APPLICATION_JSON)),productHandler::deleteProduct).andRoute(PUT("/product/{id}").and(accept(MediaType.APPLICATION_JSON)),productHandler::updateProduct);}
}

package org.smarttechie.handler;import org.smarttechie.model.Product;
import org.smarttechie.service.ProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.ServerResponse;
import reactor.core.publisher.Mono;
import static org.springframework.web.reactive.function.BodyInserters.fromObject;@Component
public class ProductHandler {@Autowiredprivate ProductService productService;static Mono<ServerResponse> notFound = ServerResponse.notFound().build();/*** The handler to get all the available products.* @param serverRequest* @return - all the products info as part of ServerResponse*/public Mono<ServerResponse> getAllProducts(ServerRequest serverRequest) {return ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).body(productService.getAllProducts(), Product.class);}/*** The handler to create a product* @param serverRequest* @return - return the created product as part of ServerResponse*/public Mono<ServerResponse> createProduct(ServerRequest serverRequest) {Mono<Product> productToSave = serverRequest.bodyToMono(Product.class);return productToSave.flatMap(product ->ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).body(productService.save(product), Product.class));}/*** The handler to delete a product based on the product id.* @param serverRequest* @return - return the deleted product as part of ServerResponse*/public Mono<ServerResponse> deleteProduct(ServerRequest serverRequest) {String id = serverRequest.pathVariable("id");Mono<Void> deleteItem = productService.deleteProduct(Integer.parseInt(id));return ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).body(deleteItem, Void.class);}/*** The handler to update a product.* @param serverRequest* @return - The updated product as part of ServerResponse*/public Mono<ServerResponse> updateProduct(ServerRequest serverRequest) {return productService.update(serverRequest.bodyToMono(Product.class)).flatMap(product ->ServerResponse.ok().contentType(MediaType.APPLICATION_JSON).body(fromObject(product))).switchIfEmpty(notFound);}
}

到目前为止，我们已经看到了如何公开响应式REST API。通过此实现，我已经使用Gatling在React式API和非React式API（使用Spring RestController构建非React式API）上做了一个简单的基准测试。以下是React式和非React式API之间的比较指标。 这不是一个广泛的基准测试。 因此，在采用之前，请确保对您的用例进行广泛的基准测试。