JavaOne 2015 報告会 @ 東京　「About MVC 1.0 & JSON-P」

4. MVC 1.0  actionベースのMVCフレームワーク  JSR371 • 現在のステータスはEarly Draft Release 2(EDR) リファレンス実装はozark • https://ozark.java.net/  JJUGもAdopt a JSRを通じて参加 3Copyright© 2015 Growth xPartners, Inc. All rights reserved.

9. Controller 8Copyright© 2015 Growth xPartners, Inc. All rights reserved. @Path("hello") public class HelloController { @Inject private Greeting greeting; @GET @Controller public String hello() { greeting.setMessage("Hello there!"); return "hello.jsp"; } }

10. Controllerのバリエーション 9Copyright© 2015 Growth xPartners, Inc. All rights reserved. @GET @Path("void") @View("hello.jsp") public void helloVoid(){ } @GET @Path("viewable") public Viewable helloViewable(){ return new Viewable("hello.jsp"); } @GET @Path("response") public Response helloResponse(){ return Response.status(Response.Status.OK).entity("hello.jsp").build(); } @GET @Path("myview") public MyView helloMyView(){ //toString returns "hello.jsp" return new MyView("hello.jsp"); }

11. Validation  Bean Validation(JSR349)ベース  Validationエラーの扱いについて • 以下の2択  ExceptionMapper<ConstraintViolationException>を実装して共通的に処理する  BindingResultをInjectionして、Controllerのメソッド内部で処理する  ハンドリングの仕様がprimitiveな印象 10Copyright© 2015 Growth xPartners, Inc. All rights reserved.

12. ExceptionMapperによるハンドリング 11Copyright© 2015 Growth xPartners, Inc. All rights reserved. public class FormViolationMapper implements ExceptionMapper<ConstraintViolationException> { public Response toResponse(ConstraintViolationException e) { Set<ConstraintViolation<?>> set = e.getConstraintViolations(); if (!set.isEmpty()) { // fill out ErrorDataBean } return Response.status(Response.Status.BAD_REQUEST) .entity("error.jsp").build(); } }

13. Controllerによるハンドリング 12Copyright© 2015 Growth xPartners, Inc. All rights reserved. @Path("form") @Controller public class FormController { @Inject private BindingResult br; @POST @ValidateOnExecution(type = ExecutableType.NONE) public Response formPost(@Valid @BeanParam FormDataBean f) { if (br.isFailed()) { return Response.status(Response.Status.BAD_REQUEST) .entity("error.jsp").build(); } return Response.status(Response.Status.OK).entity("data.jsp") .build(); } }

14. View  仕様としてサポートを要求するのはJSPとFacelet  他は全てextension  Ozarkには以下のextensionがcontribute済み  Asciidoc, Freemarker, Handlebars, Jade, JSR 223 (JavaScript)  Mustache, StringTemplate, Thymeleaf, Velocity 13Copyright© 2015 Growth xPartners, Inc. All rights reserved.

17. スコープ  Controllerのデフォルトスコープはrequest  CDIのスコープを使用可能  application/session/request/conversation  MVCで @RedirectScoped を定義  PRG(POST-Redirect-GET)パターンをサポート 16Copyright© 2015 Growth xPartners, Inc. All rights reserved.

18. @RedirectScoped 17Copyright© 2015 Growth xPartners, Inc. All rights reserved. @Named("bean") @RedirectScoped public class Greeting { private String message; public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } }

19. イベント  Observerパターン  モニタリング／デバッグ／チューニング用途  BeforeControllerEvent / AfterControllerEvent BeforeProcessViewEvent / AfterProcessViewEvent ControllerRedirectEvent  追加の可能性あり 18Copyright© 2015 Growth xPartners, Inc. All rights reserved.

20. 19Copyright© 2015 Growth xPartners, Inc. All rights reserved. @ApplicationScoped public class EventObserver{ public void onBeforeController(@Observes BeforeControllerEvent e){ System.out.println("URI:“ + e.getUriInfo().getRequestURI()); } public void onAfterController(@Observes AfterControllerEvent e){ System.out.println("Controller:" + e.getResourceInfo().getResourceMethod()); } }

26. 追加されたAPI  Json  public static JsonString createValue(String value)  public static JsonNumber createValue(int value)  imilarly for long, double, BigInteger, and BigDecimal  JsonReader  default JsonValue readValue()  JsonWriter  default void write(JsonValue value) 25Copyright© 2015 Growth xPartners, Inc. All rights reserved.

27. JsonArray and JsonObject Transformations  ビルダーパターンを用いたJsonオブジェクトの変換 26Copyright© 2015 Growth xPartners, Inc. All rights reserved. JsonArray value = Json.createArrayBuilder() .add(Json.createObjectBuilder() .add("type", "home") .add("number", "212 555-1234")).build(); JsonArray result = Json.createArrayBuilder(value) .add(Json.createObjectBuilder() .add("type", "fax") .add("number", "646 555-4567")) .build();

28. JSON-Pointer  RFC6901  JSONの特定値を差すための文字列syntax 27Copyright© 2015 Growth xPartners, Inc. All rights reserved. JsonStructure commit = reader.read(); JsonPointer p = new JsonPointer("/employee/name"); JsonStructure result = p.replace(commit, Json.createValue("Hiroyuki Onaka"))

30. JSON-PATCH  JSON更新処理の標準化  RFC6902 29Copyright© 2015 Growth xPartners, Inc. All rights reserved. JsonStructure commit = reader.read(); JsonPatchBuilder builder = new JsonPatchBuilder(); JsonStructure result = builder.add("/John/phones/office", "1234-567") .remove("/Amy/age") .apply(commit);

32. JSON-MERGE PATCH  RFC7386  JSON間のマージ処理  nullの値をマージするとキーの削除になる  application/json-patch+json 31Copyright© 2015 Growth xPartners, Inc. All rights reserved. JsonObject removeEntry = Json.createObjectBuilder() .add("hiroyuki@fieldnotes.jp", JsonValue.NULL).build(); JsonValue newCommit = JsonMergePatch.mergePatch(reader.read(), removeEntry)

34. JSON Queries with java.util.stream.Stream  JsonObject/JsonArrayをMap/Listとして stream+LambdaでOperation可能に  javax.json.stream.JsonCollectors  #groupingBy / #toJsonArray / #toJsonObject 33Copyright© 2015 Growth xPartners, Inc. All rights reserved.

35. JSON PROCESSING IN PARSING  streamモデルによる大容量Jsonデータの処理  javax.json.stream.JsonParserにAPI追加  getArray / getObject / getArrayStream / getObjectStream 34Copyright© 2015 Growth xPartners, Inc. All rights reserved.

38. 37Copyright© 2015 Growth xPartners, Inc. All rights reserved. protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Jsonb jsonb = JsonbBuilder.create(); ServletOutputStream out = response.getOutputStream(); out.print(jsonb.toJson(new JsonPlans())); out.flush(); } デモ： https://github.com/m0mus/jason_plans

43. References  MVC: Model-View-Controller API Version 1.0 Early Draft (Second Edition)  http://download.oracle.com/otndocs/jcp/mvc-1-edr2-spec/index.html  JSR-000374 Java API for JSON Processing 1.1 Early Draft Review Javadoc  http://download.oracle.com/otndocs/jcp/json_p-1_1-edr-spec/index.html  JavaOne 2015 セッション資料  Introduction to MVC 1.0 (JSR 371) [CON4176]  What’s New in the Java API for JSON Processing? [CON3561]  What’s New in Java API for JSON Binding (JSR 367) [CON6155] 42Copyright© 2015 Growth xPartners, Inc. All rights reserved.

JavaOne 2015 報告会 @ 東京　「About MVC 1.0 & JSON-P」

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