{"id":47708,"date":"2023-05-07T20:41:10","date_gmt":"2023-05-22T22:02:45","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8netflix-dgs%e4%b8%8a%e4%bd%bf%e7%94%a8java%e5%ae%9e%e7%8e%b0%e5%a4%a7%e8%a7%84%e6%a8%a1graphql%e6%9c%8d%e5%8a%a1%e5%99%a8\/"},"modified":"2024-04-30T03:06:12","modified_gmt":"2024-04-29T19:06:12","slug":"%e5%9c%a8netflix-dgs%e4%b8%8a%e4%bd%bf%e7%94%a8java%e5%ae%9e%e7%8e%b0%e5%a4%a7%e8%a7%84%e6%a8%a1graphql%e6%9c%8d%e5%8a%a1%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8netflix-dgs%e4%b8%8a%e4%bd%bf%e7%94%a8java%e5%ae%9e%e7%8e%b0%e5%a4%a7%e8%a7%84%e6%a8%a1graphql%e6%9c%8d%e5%8a%a1%e5%99%a8\/","title":{"rendered":"\u5728Netflix DGS\u4e0a\u4f7f\u7528Java\u5b9e\u73b0\u5927\u89c4\u6a21GraphQL\u670d\u52a1\u5668"},"content":{"rendered":"<p>\u7531\u4e8eNetflix\u7684Tech\u535a\u5ba2\u4e0a\u53d1\u5e03\u4e86GraphQL\u6846\u67b6\u7684OSS\u7248\u672c\uff0c\u6240\u4ee5\u6211\u7acb\u523b\u5c1d\u8bd5\u4f7f\u7528\u4e86\u5b83\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">How Netflix Scales its API with GraphQL Federation (Part 1)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">How Netflix Scales its API with GraphQL Federation (Part 2)<\/ul>\n<h2>\u7f51\u98de DGS<\/h2>\n<p>DGS\uff08Domain Graph Service\uff09\u662fNetflix\u5f00\u53d1\u7684\u7528\u4e8e\u6784\u5efaJava\/Kotlin\u7684GraphQL\u670d\u52a1\u5668\u7684\u6846\u67b6\u3002\u5b83\u65e8\u5728\u6784\u5efa\u5927\u89c4\u6a21\u7684GraphQL\u670d\u52a1\uff0c\u5e76\u91c7\u7528\u4e86Apollo Federation\u3002\u7531\u4e8e\u5728Spring Boot\u4e0a\u8fd0\u884c\uff0c\u56e0\u6b64\u6210\u4e3a\u975e\u5e38\u6613\u4e8e\u64cd\u4f5c\u7684\u6846\u67b6\u3002\u5b83\u8fd8\u652f\u6301Spring Security\u548c\u4ece\u6a21\u5f0f\u751f\u6210\u4ee3\u7801\u3002\u8bf7\u53c2\u9605\u5b98\u65b9\u6587\u6863\u4ee5\u83b7\u53d6\u66f4\u8be6\u7ec6\u7684\u4fe1\u606f\u3002<\/p>\n<h2>Netflix\u5f00\u53d1GraphQL\u6846\u67b6\u7684\u80cc\u666f\u662f\u4ec0\u4e48\uff1f<\/h2>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d8088913a08637a6aa3b8\/5-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2021-01-17 20.59.42.png\" \/><\/div>\n<p>\u771f\u7684\u5f88\u8907\u96dc\u5462\u3002\u5f9e\u524d\u7aef\u7684\u89d2\u5ea6\u4f86\u770b\uff0c\u7531\u65bc\u6709\u5f88\u591a\u67e5\u8a62\u670d\u52d9\u7aef\u9ede\uff0c\u56e0\u6b64\u7ba1\u7406\u8d77\u4f86\u6703\u5f88\u9ebb\u7169\u3002<br \/>\n\u5f9e\u670d\u52d9\u7aef\u7684\u89d2\u5ea6\u4f86\u770b\uff0c\u5982\u679c\u9700\u8981\u8eab\u4efd\u9a57\u8b49\u7b49\u524d\u7f6e\u8655\u7406\uff0c\u6bcf\u500b\u5fae\u670d\u52d9\u90fd\u9700\u8981\u5be6\u73fe\u76f8\u540c\u7684\u8655\u7406\uff0c\u53ef\u80fd\u6703\u7522\u751f\u554f\u984c\u3002<\/p>\n<p>\u5728Netflix\u4e2d\uff0c\u6211\u4eec\u51b3\u5b9a\u91c7\u7528GraphQL\u3002\u91c7\u7528GraphQL\u4e4b\u540e\u7684\u67b6\u6784\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d8088913a08637a6aa3b8\/8-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2021-01-17 21.06.33.png\" \/><\/div>\n<p>\u524d\u7aef\u7684\u67e5\u8be2\u64cd\u4f5c\u73b0\u5728\u88ab\u6536\u96c6\u5230\u7d2b\u8272\u90e8\u5206\uff0c\u4ee5GraphQL\u4f5c\u4e3a\u7edf\u4e00\u7684\u7ed3\u6784\uff0c\u4f7f\u5f97\u6574\u4f53\u66f4\u52a0\u6e05\u6670\u7b80\u6d01\u3002<br \/>\n\u524d\u7aef\u53d1\u51fa\u7684\u8bf7\u6c42\u901a\u8fc7GraphQL\u8f6c\u53d1\u5230\u5404\u4e2a\u5fae\u670d\u52a1\u8fdb\u884c\u5904\u7406\u3002<br \/>\n\u5982\u679c\u5c06\u524d\u7f6e\u5904\u7406\uff08\u5982\u8ba4\u8bc1\uff09\u4e5f\u5b9e\u73b0\u5728GraphQL\u90e8\u5206\uff0c\u770b\u8d77\u6765\u5c31\u4e0d\u9700\u8981\u5728\u6bcf\u4e2a\u5fae\u670d\u52a1\u4e2d\u91cd\u590d\u5b9e\u73b0\u76f8\u540c\u7684\u5904\u7406\u903b\u8f91\u4e86\u3002<\/p>\n<p>\u7136\u800c\uff0c\u8fd9\u91cc\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\u3002\u8d1f\u8d23\u8fd0\u8425GraphQL\u7684\u56e2\u961f\u627f\u62c5\u7740\u5de8\u5927\u7684\u5de5\u4f5c\u8d1f\u8377\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u4eec\u91c7\u7528\u4e86Apollo Federation\u5e76\u5c06\u8d1f\u8f7d\u5206\u6563\u5230\u4e86GraphQL\u5f00\u53d1\u4e2d\u3002Apollo Federation\u91c7\u7528\u540e\u7684\u60c5\u51b5\u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d8088913a08637a6aa3b8\/12-0.png\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2021-01-17 21.18.17.png\" \/><\/div>\n<p>\u901a\u8fc7\u91c7\u7528Apollo Federation\uff0c\u53ef\u4ee5\u5c06GraphQL Gateway\u653e\u7f6e\u5728\u524d\u7aef\uff0c\u5e76\u5c06\u5404\u4e2aGraphQL\u670d\u52a1\u90e8\u7f72\u5728\u5176\u540e\u7aef\uff0c\u5b9e\u73b0\u8fd9\u6837\u7684\u67b6\u6784\u662f\u53ef\u80fd\u7684\u3002\u5728\u4e0a\u56fe\u4e2d\uff0c\u7d2b\u8272\u90e8\u5206\u4ee3\u8868GraphQL Gateway\uff0c\u53f3\u4fa7\u7684\u84dd\u8272\u90e8\u5206\u4ee3\u8868\u5404\u4e2a\u5fae\u670d\u52a1\u7684GraphQL\u3002<\/p>\n<p>\u5404\u4e2a\u5fae\u670d\u52a1\u7684GraphQL\u7531\u5404\u4e2a\u670d\u52a1\u56e2\u961f\u8fd0\u8425\u7ba1\u7406\uff0cGraphQL Gateway\u5219\u901a\u8fc7\u4ec5\u5b9e\u73b0\u5fc5\u8981\u7684\u6700\u5c0f\u9650\u5ea6\u529f\u80fd\uff0c\u5b9e\u73b0\u4e86GraphQL\u8d1f\u8f7d\u7684\u5206\u6563\u3002<\/p>\n<h2>\u786e\u5b9a\u8981\u5b9e\u65bd\u7684\u529f\u80fd<\/h2>\n<p>\u597d\u7684\uff0c\u73b0\u5728\u6211\u4eec\u5c06\u4f7f\u7528\u6846\u67b6\u6765\u8fdb\u884c\u5b9e\u9645\u5b9e\u73b0\u3002<br \/>\n\u6211\u51b3\u5b9a\u5c06\u4e4b\u524d\u5199\u8fc7\u7684\u300a\u4f7f\u7528Java\u5b9e\u73b0GraphQL\u670d\u52a1\u5668\u300b\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u7684\u540c\u4e00\u529f\u80fd\uff08\u67e5\u8be2\u3001\u53d8\u66f4\u3001\u8ba2\u9605\uff09\u8fdb\u884c\u5b9e\u73b0\u3002\u4ee5\u4e0b\u662f\u8fd9\u4e9b\u529f\u80fd\u7684\u4f7f\u7528\u6848\u4f8b\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Query: \u672c\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Query: \u672c\u306eID\u3092\u6307\u5b9a\u3057\u3066\u3001\u7279\u5b9a\u306e\u672c\u3092\u53d6\u5f97\u3059\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Mutation: \u65b0\u3057\u3044\u672c\u3092\u767b\u9332\u3059\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Subscription: \u65b0\u305f\u306b\u767b\u9332\u3055\u308c\u305f\u672c\u3092\u901a\u77e5\u3059\u308b\u3002<\/ul>\n<p>\u6211\u672c\u6765\u60f3\u5b9e\u73b0Federation\uff0c\u4f46\u76ee\u524d\u8fd8\u6ca1\u627e\u5230\u6709\u5173Federation\u7684\u6587\u4ef6\uff0c\u5c24\u5176\u662fGateway\u90e8\u5206\u7684\u5b9e\u73b0\u6211\u4e0d\u592a\u6e05\u695a\u3002\u4e00\u65e6\u6709\u4e86\u6587\u6863\uff0c\u6211\u4f1a\u5c1d\u8bd5\u7740\u53bb\u5b9e\u73b0\u3002<\/p>\n<h2>\u6784\u6210\u9879\u76ee\u3002<\/h2>\n<p>\u8be5\u9879\u76ee\u5c06\u4f7f\u7528Spring Initializer\u6765\u521b\u5efa\u4e00\u4e2a\u9002\u5f53\u7684\u6a21\u677f\u3002\u7531\u4e8e\u9700\u8981\u7684\u4f9d\u8d56\u9879\u7a0d\u540e\u6dfb\u52a0\uff0c\u56e0\u6b64\u5728\u8fd9\u91cc\u53ea\u6dfb\u52a0Lombok\u3002<\/p>\n<h2>\u521b\u9020\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f<\/h2>\n<h3>\u6784\u5efa.gradle\u6587\u4ef6<\/h3>\n<p>\u5c06\u4f1a\u8fdb\u884c\u5982\u4e0b\u66f4\u6539\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">plugins<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">id<\/span> <span class=\"s1\">'org.springframework.boot'<\/span> <span class=\"n\">version<\/span> <span class=\"s1\">'2.4.1'<\/span>\r\n    <span class=\"n\">id<\/span> <span class=\"s1\">'io.spring.dependency-management'<\/span> <span class=\"n\">version<\/span> <span class=\"s1\">'1.0.10.RELEASE'<\/span>\r\n    <span class=\"n\">id<\/span> <span class=\"s1\">'java'<\/span>\r\n    <span class=\"c1\">\/\/ Added for \"api\".<\/span>\r\n    <span class=\"n\">id<\/span> <span class=\"s1\">'java-library'<\/span>\r\n    <span class=\"c1\">\/\/ Added for code generation from scheme.<\/span>\r\n    <span class=\"n\">id<\/span> <span class=\"s1\">'com.netflix.dgs.codegen'<\/span> <span class=\"n\">version<\/span> <span class=\"s1\">'4.0.10'<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"n\">sourceCompatibility<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'11'<\/span>\r\n\r\n<span class=\"n\">configurations<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">compileOnly<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"n\">extendsFrom<\/span> <span class=\"n\">annotationProcessor<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"k\">repositories<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">mavenCentral<\/span><span class=\"o\">()<\/span>\r\n    <span class=\"c1\">\/\/ Added to fix error \"Could not find com.apollographql.federation:federation-graphql-java-support\".<\/span>\r\n    <span class=\"n\">jcenter<\/span><span class=\"o\">()<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"k\">dependencies<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">api<\/span> <span class=\"s1\">'com.netflix.graphql.dgs:graphql-dgs-spring-boot-starter:latest.release'<\/span>\r\n    <span class=\"c1\">\/\/ Added for subscription.<\/span>\r\n    <span class=\"n\">implementation<\/span> <span class=\"s1\">'com.netflix.graphql.dgs:graphql-dgs-subscriptions-websockets-autoconfigure:latest.release'<\/span>\r\n\r\n    <span class=\"n\">implementation<\/span> <span class=\"s1\">'org.springframework.boot:spring-boot-starter-web'<\/span>\r\n\r\n    <span class=\"n\">compileOnly<\/span> <span class=\"s1\">'org.projectlombok:lombok'<\/span>\r\n    <span class=\"n\">annotationProcessor<\/span> <span class=\"s1\">'org.projectlombok:lombok'<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ Added for code generation from scheme.<\/span>\r\n<span class=\"n\">generateJava<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"n\">schemaPaths<\/span> <span class=\"o\">=<\/span> <span class=\"o\">[<\/span><span class=\"s2\">\"${projectDir}\/src\/main\/resources\/schema\"<\/span><span class=\"o\">]<\/span>\r\n    <span class=\"c1\">\/\/ Set package name of generated code.<\/span>\r\n    <span class=\"n\">packageName<\/span> <span class=\"o\">=<\/span> <span class=\"s1\">'sandbox.dgs'<\/span>\r\n    <span class=\"c1\">\/\/ Set \"false\" not to generate client code.<\/span>\r\n    <span class=\"n\">generateClient<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">false<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>schema.graphqls \u7684\u4e2d\u6587\u8868\u8ff0<\/h3>\n<p>\u67b6\u6784.graphqls<\/p>\n<p>\u6211\u5011\u8981\u5b9a\u7fa9GraphQL\u7684\u6a21\u5f0f\u3002<br \/>\n\u5c07schema.graphqls\u6a94\u6848\u8a3b\u518a\u5728src\/main\/resources\/schema\u8cc7\u6599\u593e\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code>type Query {\r\n    bookById(id: ID): [Book]!\r\n    books: [Book]!\r\n}\r\n\r\ntype Book {\r\n    id: ID\r\n    name: String\r\n    pageCount: Int\r\n}\r\n\r\ntype Mutation {\r\n    registerBook (\r\n        id: ID\r\n        name: String\r\n        pageCount: Int\r\n    ): Book\r\n}\r\n\r\ntype Subscription {\r\n    subscribeBooks: Book\r\n}\r\n<\/code><\/pre>\n<h3>Java\u6a21\u578b<\/h3>\n<p>\u4f7f\u7528\u4ee3\u7801\u751f\u6210\u63d2\u4ef6\uff0c\u4ece\u6a21\u5f0f\u4e2d\u521b\u5efaJava\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code>$ .\/gradlew generateJava \r\n$ ls -l build\/generated\/sandbox\/dgs\r\ntotal 8\r\n-rw-r--r--  1 xxxxxxx  yyyyy  942 Jan 11 19:48 DgsConstants.java\r\ndrwxr-xr-x  4 xxxxxxx  yyyyy  128 Jan 11 19:48 types\r\n\r\n$ ls -l build\/generated\/sandbox\/dgs\/types\r\ntotal 16\r\n-rw-r--r--  1 xxxxxxx  yyyyy  2223 Jan 11 19:48 Book.java\r\n-rw-r--r--  1 xxxxxxx  yyyyy  1487 Jan 11 19:48 Subscription.java\r\n<\/code><\/pre>\n<p>\u6211\u6210\u529f\u521b\u5efa\u4e86\u4e00\u4e2aBook\u7c7b\u3002<\/p>\n<h3>DGS\u7ec4\u4ef6<\/h3>\n<p>\u7136\u540e\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u5b9e\u73b0\u4e86Query\u3001Mutation\u548cSubscription\u7684Service\u7c7b\uff08DGS\u7ec4\u4ef6\uff09\u3002\u6211\u4eec\u505a\u4e86\u4ee5\u4e0b\u4e8b\u60c5\uff1a<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30af\u30e9\u30b9\u306b@DgsComponent\u3092\u4ed8\u4e0e\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30e1\u30bd\u30c3\u30c9\u306b@DgsData\u3092\u4ed8\u4e0e\u3057\u3001parentType\u306b\u306f\u30b9\u30ad\u30fc\u30de\u306etype name\u3001field\u306b\u306ffield name\u3092\u8a2d\u5b9a\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">field\u306e\u5f15\u6570\u306f\u3001@InputArgument\u3082\u3057\u304f\u306fDataFetchingEnvironment\u3092\u4f7f\u7528\u3057\u3066\u53d6\u5f97\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">subscription\u306ereturn\u5024\u306freactive-streams\u306ePublisher\u3092\u8fd4\u3057\u307e\u3059\u3002<\/ul>\n<p>DataProvider \u548c IBookProcessor \u662f\u6211\u5011\u81ea\u5df1\u5efa\u7acb\u7684\u985e\u5225\u3002\u57f7\u884c\u4ee5\u4e0b\u7684\u8655\u7406\u6b65\u9a5f\uff1a<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">DataProvider : \u30c7\u30fc\u30bf\u63d0\u4f9b\u30af\u30e9\u30b9\u3002\u3059\u3079\u3066\u306eBook\u306eList\u3001\u307e\u305f\u306f\u6307\u5b9a\u3055\u308c\u305fbookId\u306eBook\u3092\u8fd4\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">IBookProcessor : \u672c\u306e\u767b\u9332\u3092\u30a4\u30d9\u30f3\u30c8\u3068\u3057\u3066\u767b\u9332(emit)\u3057\u3001\u30a4\u30d9\u30f3\u30c8\u306ePublisher\u3092\u767a\u884c(publish)\u3059\u308b\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"nd\">@AllArgsConstructor<\/span>\r\n<span class=\"nd\">@DgsComponent<\/span>\r\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">BookService<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">DataProvider<\/span> <span class=\"n\">dataProvider<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">IBookProcessor<\/span> <span class=\"n\">bookProcessor<\/span><span class=\"o\">;<\/span>\r\n\r\n    <span class=\"nd\">@DgsData<\/span><span class=\"o\">(<\/span><span class=\"n\">parentType<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Query\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">field<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"books\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Book<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">books<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">dataProvider<\/span><span class=\"o\">.<\/span><span class=\"na\">books<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@DgsData<\/span><span class=\"o\">(<\/span><span class=\"n\">parentType<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Query\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">field<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"bookById\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Book<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">books<\/span><span class=\"o\">(<\/span><span class=\"nd\">@InputArgument<\/span><span class=\"o\">(<\/span><span class=\"s\">\"id\"<\/span><span class=\"o\">)<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">id<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">id<\/span> <span class=\"o\">==<\/span> <span class=\"kc\">null<\/span> <span class=\"o\">||<\/span> <span class=\"n\">id<\/span><span class=\"o\">.<\/span><span class=\"na\">isEmpty<\/span><span class=\"o\">())<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"n\">dataProvider<\/span><span class=\"o\">.<\/span><span class=\"na\">books<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"o\">}<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nc\">List<\/span><span class=\"o\">.<\/span><span class=\"na\">of<\/span><span class=\"o\">(<\/span><span class=\"n\">dataProvider<\/span><span class=\"o\">.<\/span><span class=\"na\">bookById<\/span><span class=\"o\">(<\/span><span class=\"n\">id<\/span><span class=\"o\">));<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@DgsData<\/span><span class=\"o\">(<\/span><span class=\"n\">parentType<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Mutation\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">field<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"registerBook\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">Book<\/span> <span class=\"nf\">registerBook<\/span><span class=\"o\">(<\/span><span class=\"nc\">DataFetchingEnvironment<\/span> <span class=\"n\">dataFetchingEnvironment<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">id<\/span> <span class=\"o\">=<\/span> <span class=\"n\">dataFetchingEnvironment<\/span><span class=\"o\">.<\/span><span class=\"na\">getArgument<\/span><span class=\"o\">(<\/span><span class=\"s\">\"id\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"n\">dataFetchingEnvironment<\/span><span class=\"o\">.<\/span><span class=\"na\">getArgument<\/span><span class=\"o\">(<\/span><span class=\"s\">\"name\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">pageCount<\/span> <span class=\"o\">=<\/span> <span class=\"n\">dataFetchingEnvironment<\/span><span class=\"o\">.<\/span><span class=\"na\">getArgument<\/span><span class=\"o\">(<\/span><span class=\"s\">\"pageCount\"<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"kd\">final<\/span> <span class=\"nc\">Book<\/span> <span class=\"n\">book<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Book<\/span><span class=\"o\">(<\/span><span class=\"n\">id<\/span><span class=\"o\">,<\/span> <span class=\"n\">name<\/span><span class=\"o\">,<\/span> <span class=\"n\">pageCount<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">dataProvider<\/span><span class=\"o\">.<\/span><span class=\"na\">books<\/span><span class=\"o\">().<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"n\">book<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"c1\">\/\/ Emit an event for subscription.<\/span>\r\n        <span class=\"n\">bookProcessor<\/span><span class=\"o\">.<\/span><span class=\"na\">emit<\/span><span class=\"o\">(<\/span><span class=\"n\">book<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">book<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"nd\">@DgsData<\/span><span class=\"o\">(<\/span><span class=\"n\">parentType<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"Subscription\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">field<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"subscribeBooks\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">Publisher<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Book<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">subscribeBooks<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"n\">bookProcessor<\/span><span class=\"o\">.<\/span><span class=\"na\">publish<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u6267\u884c\u5e94\u7528\u7a0b\u5e8f<\/h3>\n<p>\u6267\u884c\u521b\u5efa\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u7531\u4e8e\u9644\u5e26\u4e86GraphiQL\uff0c\u56e0\u6b64\u542f\u52a8SpringBoot\u5e94\u7528\u7a0b\u5e8f\uff0c\u5e76\u5728\u6d4f\u89c8\u5668\u4e2d\u8bbf\u95ee\u7aef\u70b9\uff08http:\/\/localhost:8080\/graphiql\uff09\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d8088913a08637a6aa3b8\/39-3.png\" alt=\"subscription.png\" \/><\/div>\n<p>\u53ea\u6709\u8ba2\u9605\u51fa\u73b0\u9519\u8bef\u3002\u68c0\u67e5\u4e86\u8c03\u8bd5\u65e5\u5fd7\u540e\uff0c\u53d1\u73b0\u4ee5\u4e0b\u9519\u8bef\u5df2\u88ab\u8f93\u51fa\u3002<\/p>\n<pre class=\"post-pre\"><code>2021-01-11 21:05:52.305 DEBUG 70696 --- [nio-8080-exec-2] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Writing [\"Trying to execute subscription on \/graphql. Use \/subscriptions instead!\"]\r\n2021-01-11 21:05:52.305 DEBUG 70696 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Completed 400 BAD_REQUEST\r\n<\/code><\/pre>\n<p>\u5bf9\u4e8eSubscription\uff0c\u8bf7\u53d1\u9001\u8bf7\u6c42\u5230\/subscriptions\u3002<br \/>\n\u7531\u4e8e\u4e0d\u77e5\u9053\u5982\u4f55\u66f4\u6539GraphiQL\u7684\u8bf7\u6c42\u76ee\u6807\uff0c\u6240\u4ee5\u6211\u5c1d\u8bd5\u5b9e\u65bd\u5982\u4e0b\u5ba2\u6237\u7aef\u4ee3\u7801\uff0c\u5e76\u6210\u529f\u8fd0\u884c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">WebSocketLink<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">@apollo\/client\/link\/ws<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">SubscriptionClient<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">subscriptions-transport-ws<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">ApolloClient<\/span><span class=\"p\">,<\/span> <span class=\"nx\">InMemoryCache<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">@apollo\/client<\/span><span class=\"dl\">\"<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"nx\">gql<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">graphql-tag<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"o\">*<\/span> <span class=\"k\">as<\/span> <span class=\"nx\">$<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">jquery<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">GRAPHQL_ENDPOINT<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">ws:\/\/localhost:8080\/subscriptions<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">client<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">SubscriptionClient<\/span><span class=\"p\">(<\/span><span class=\"nx\">GRAPHQL_ENDPOINT<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">reconnect<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">link<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">WebSocketLink<\/span><span class=\"p\">(<\/span><span class=\"nx\">client<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">apolloClient<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">ApolloClient<\/span><span class=\"p\">({<\/span>\r\n  <span class=\"na\">link<\/span><span class=\"p\">:<\/span> <span class=\"nx\">link<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">cache<\/span><span class=\"p\">:<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">InMemoryCache<\/span><span class=\"p\">()<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">asGql<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">gql<\/span><span class=\"s2\">`\r\nsubscription BookSubscription {\r\n  subscribeBooks {\r\n    id,\r\n    name\r\n  }\r\n}\r\n`<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">s<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">apolloClient<\/span><span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">({<\/span>\r\n  <span class=\"na\">query<\/span><span class=\"p\">:<\/span> <span class=\"nx\">asGql<\/span>\r\n<span class=\"p\">})<\/span>\r\n<span class=\"nx\">s<\/span><span class=\"p\">.<\/span><span class=\"nx\">subscribe<\/span><span class=\"p\">({<\/span>\r\n  <span class=\"na\">next<\/span><span class=\"p\">:<\/span> <span class=\"p\">({<\/span> <span class=\"nx\">data<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">result<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">document<\/span><span class=\"p\">.<\/span><span class=\"nx\">getElementById<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">result<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"nx\">$<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">#result<\/span><span class=\"dl\">\"<\/span><span class=\"p\">).<\/span><span class=\"nx\">append<\/span><span class=\"p\">(<\/span><span class=\"nx\">JSON<\/span><span class=\"p\">.<\/span><span class=\"nx\">stringify<\/span><span class=\"p\">(<\/span><span class=\"nx\">data<\/span><span class=\"p\">));<\/span>\r\n    <span class=\"nx\">$<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">#result<\/span><span class=\"dl\">\"<\/span><span class=\"p\">).<\/span><span class=\"nx\">append<\/span><span class=\"p\">(<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">&lt;br&gt;<\/span><span class=\"dl\">\"<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">});<\/span>\r\n<\/code><\/pre>\n<h3>\u6458\u8981<\/h3>\n<p>(m\u01ce<\/p>\n<p>\u6211\u5df2\u7ecf\u63cf\u8ff0\u4e86\u4f7f\u7528Netflix DGS\u5b9e\u73b0GraphQL\u670d\u52a1\u5668\u7684\u65b9\u6cd5\u3002<br \/>\n\u5c3d\u7ba1\u6211\u53ea\u662f\u5c1d\u8bd5\u4e86GraphQL\u7684\u57fa\u672c\u529f\u80fd\uff0c\u4f46\u4f7f\u7528\u8d77\u6765\u611f\u89c9\u8fd8\u4e0d\u9519\u3002<br \/>\n\u6211\u5f88\u60f3\u5c3d\u5feb\u5c1d\u8bd5Federation\u7684\u90e8\u5206\u3002<\/p>\n<p>\u6211\u5df2\u7ecf\u628a\u7f16\u5199\u597d\u7684\u6e90\u4ee3\u7801\u6ce8\u518c\u5230\u4e86GitHub\u4e0a\u3002\u5e0c\u671b\u60a8\u53ef\u4ee5\u53c2\u8003\u3002<\/p>\n<ul class=\"post-ul\">Simple application of GraphQL server with DGS<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u7531\u4e8eNetflix\u7684Tech\u535a\u5ba2\u4e0a\u53d1\u5e03\u4e86GraphQL\u6846\u67b6\u7684OSS\u7248\u672c\uff0c\u6240\u4ee5\u6211\u7acb\u523b\u5c1d\u8bd5\u4f7f\u7528\u4e86\u5b83\u3002 How Ne [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-47708","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5728Netflix DGS\u4e0a\u4f7f\u7528Java\u5b9e\u73b0\u5927\u89c4\u6a21GraphQL\u670d\u52a1\u5668 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728netflix-dgs\u4e0a\u4f7f\u7528java\u5b9e\u73b0\u5927\u89c4\u6a21graphql\u670d\u52a1\u5668\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" 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