Netflix 已凋谢其 Domain Graph Service（DGS）框架的源代码 ，该框架是为了不便整合 GraphQL 应用，用于简化 GraphQL 的实现。

GraphQL 次要是作用于数据接口，比方前端后端交互。无需定义或批改后盾 Controller、Service 等业务代码即可实现灵便的数据变更，客户端能够自在获取服务端当时定义好的数据，进步了交互接口的灵活性

组件依赖

  • graphql-dgs-spring-boot-starter
<dependency>    <groupId>com.netflix.graphql.dgs</groupId>    <artifactId>graphql-dgs-spring-boot-starter</artifactId>    <version>3.5.1</version></dependency>
  • DGS 必须从 jcenter 下载,不然局部依赖无奈下载。踩坑很久
    <profiles>        <profile>            <activation>                <activeByDefault>true</activeByDefault>            </activation>            <repositories>                <repository>                    <snapshots>                        <enabled>false</enabled>                    </snapshots>                    <id>central</id>                    <name>bintray</name>                    <url>https://jcenter.bintray.com</url>                </repository>            </repositories>            <pluginRepositories>                <pluginRepository>                    <snapshots>                        <enabled>false</enabled>                    </snapshots>                    <id>central</id>                    <name>bintray-plugins</name>                    <url>https://jcenter.bintray.com</url>                </pluginRepository>            </pluginRepositories>            <id>bintray</id>        </profile>    </profiles>

定义接口 schema

  • /src/main/resources/schema/schema.graphqls

此文件定义了客户端申请入参格局和查问数据类型

type Query {    shows(title: String ,releaseYear: Int): [Show]}type Show {    title: String    releaseYear: Int}

定义数据抽取规定

@DgsComponentpublic class ShowsDatafetcher {    @DgsData(parentType = "Query", field = "shows")    public List<Show> shows(@InputArgument("title") String title, @InputArgument("releaseYear") Integer releaseYear) {        if (title == null) {            return shows;        }        return shows.stream().filter(s -> s.getTitle().contains(title)).collect(Collectors.toList());    }    // 模仿 DB 查问      private final List<Show> shows = List.of(            new Show("java", 1995),            new Show("php", 1995),            new Show("python", 1990),            new Show("golang", 2009),            new Show("rust", 2015)    );}

UI 前端调试

  • 拜访: http://localhost:8080/graphiql

  • 条件查问

接口调用

curl --location --request POST 'http://localhost:8080/graphql' \--header 'Content-Type: application/json' \--data-raw '{"query":"{\n  shows(title: \"java\", releaseYear: 1995) {\n    title\n    releaseYear\n  }\n}\n","variables":null}'

java 调用

@SpringBootTest(classes = {DgsAutoConfiguration.class, ShowsDatafetcher.class})class ShowsDatafetcherTests {    @Autowired    DgsQueryExecutor dgsQueryExecutor;    @Test    void shows() {        List<String> titles = dgsQueryExecutor.executeAndExtractJsonPath(                " { shows { title releaseYear }}",                "data.shows[*].title");        assertThat(titles).contains("java");    }}

本节源码

源码: https://github.com/lltx/dgs-demo
DGS 官网: https://netflix.github.io/dgs
>>> 源码 https://gitee.com/log4j/pig，欢送署名转载 <<<