Nashorn in the future (Japanese)
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Presentation on Nashorn at Java Day Tokyo 2015.
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Nashorn in the future (Japanese)
- 1. Nashorn in the Future Oracle Corporation Japan Fusion Middleware Business Unit NISHIKAWA, Akihiro 2015年年4⽉月8⽇日 Copyright © 2015, Oracle and/or its affiliates. All rights reserved. |
- 2. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Safe Harbor Statement The following is intended to outline our general product direcIon. It is intended for informaIon purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or funcIonality, and should not be relied upon in making purchasing decisions. The development, release, and Iming of any features or funcIonality described for Oracle’s products remains at the sole discreIon of Oracle. 2
- 3. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Agenda What's Nashorn? 8u20 8u40 In the future... 1 2 3 4 3
- 4. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | What’s Nashorn? 4
- 5. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Nashorn • Rhinoの置き換え – セキュリティ、パフォーマンスの向上 • InvokeDynamic (JSR-‐292) のProof of Concept 5 Java 8から導⼊入されたJavaScript Engine (JEP 174)
- 6. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Nashorn • ECMAScript-‐262 EdiIon 5.1 • javax.script (JSR 223) API • JavaóJavaScript間での相互呼び出し • コマンドラインツールは jjs Java 8から導⼊入されたJavaScript Engine (JEP 174) 6
- 7. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 使ってみよう • jjs – Hello World – Lambda Expression, Stream • jjs –scripting – Web APIを呼び出してみる • jjs –fx – WebView 7
- 8. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Lambda ExpressionはFuncIonで // Java array.stream().sorted(Comparator.naturalOrder()) .forEach( t -‐> sortedArray.add(t) ); // Nashorn array.stream().sorted(Comparator.naturalOrder()) .forEach(function(t) sortedArray.add(t)); 8
- 9. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Javaから呼び出す(1) ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName("nashorn"); // 評価 engine.eval("print('hello world')"); // hello world engine.eval(new FileReader(“hello.js”)); // hello.js 9
- 10. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Javaから呼び出す(2) engine.eval("function hello(name){ print('Hello, ' + name); }"); Invocable inv=(Invocable)engine; // Hello, Taro Object obj= inv.invokeFunction("hello","Taro"); 10 JavaScriptのfunc:onを呼び出す
- 11. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Javaから呼び出す(3) engine.eval("function run(){ print('run() called'); }"); Invocable inv =(Invocable)engine; Runnable r=inv.getInterface(Runnable.class); Thread th=new Threads(r); th.start(); th.join(); 11 Script func:onでInterfaceを実装する
- 12. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 8u20 12
- 13. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 8u20 • セキュリティ⾯面の強化 • 基礎部分のJIT/JDKの強化 13 2014年年8⽉月リリース
- 14. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | constを varで置き換え • デフォルトはfalse • 8u40でconstをサポートしたので、今後使えなくなる予定 14 -‐-‐const-‐as-‐var=true|false
- 15. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ScriptからJava PackageやClassへのアクセスを禁⽌止 • デフォルトはfalse 15 -‐-‐no-‐java=true|false (-‐nj)
- 16. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ECMAScript標準に反する構⽂文の使⽤用を禁⽌止 • Java.typeなどのExtensionは利利⽤用可 • -‐scripting 併⽤用時には⾃自動的に無効化 16 -‐-‐no-‐syntax-‐extensions (-‐nse)
- 17. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | #sourceURLと@sourceURL • Evalソースに名前を付ける //# sourceURL=myScript.js @sourceURL=myScript.js 17 JDK-‐8032068 : implement @sourceURL and #sourceURL direc:ves
- 18. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | クラスキャッシュ • 当初は内部にキャッシュを保持せず、逐⼀一コンパイル • 8u20から、内部にキャッシュを持ち、コードを再利利⽤用するように • 例例：Javaから – engine.eval(new URLReader(myScriptURL)); • JavaScriptから – load(url); 18 JDK-‐8021350 : Share script classes between threads/globals within context
- 19. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 8u40 19
- 20. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 8u40 • パフォーマンス改善 – OpImisIc typing (JEP 196) – Code Persistence (JEP 194) • セキュリティ – Class Filter (JEP 202) • ECMAScript 6仕様の段階的なサポート – Lexical-‐scoped variables and constant definiIon (JEP 203) 20 実装されたJEP
- 21. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 196: OpImisIc Typing • できるだけ実⾏行行時に型推論論せずに パフォーマンス向上をはかる – 演算および配列列のインデックス操作 で使⽤用する特定の型（type）を仮定 – 仮定した型推論論が正しくない場合、 仮定を取り消してフォールバック • -‐-‐optimistic-‐types=true|false (-‐ot) – デフォルトはfalse 21 楽観的型推論論 – Javaのようなバイトコードを⽣生成するために int long double Object
- 22. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 196: OpImisIc Typing • nashorn.typeInfo.maxFiles – 型情報をキャッシュするためのファイルの最⼤大個数 – 0でキャッシュを保持しない設定 • nashorn.typeInfo.cacheDir – 型情報をキャッシュするファイルが存在するディレクトリ • Windows: ${java.io.tmpdir}com.oracle.java.NashornTypeInfo • LinuxとSolaris: ~/.cache/com.oracle.java.NashornTypeInfo • Mac OS X: ~/Library/Caches/com.oracle.java.NashornTypeInfo 22 型推論論結果のキャッシュ
- 23. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 194: Code Persistence • 同じプロセス内で再利利⽤用できるようコードをキャッシュ • メモリ使⽤用量量の削減ならびに起動時間短縮に寄与 23 コードキャッシュによる⾼高速化
- 24. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 194: Code Persistence • -‐-‐class-‐cache-‐size=50 (-‐ccs) – グローバル・スコープ毎のクラス・キャッシュサイズ – デフォルトサイズは50 （個） • -‐-‐persistent-‐code-‐cache=true|false (-‐pcc) – 楽観的型推論論情報（OpImisIc type informaIon）も含め、ディスクにコンパイ ル済みスクリプトを永続化 – デフォルトはfalse 24 コードキャッシュによる⾼高速化
- 25. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 194: Code Persistence • -‐pccを指定した場合の情報の永続先 – デフォルトは実⾏行行ディレクトリのnashorn_code_cache – フォルダ名は変更更可能 • nashorn.persistent.code.cache システムプロパティ • クラスのバイトコードだけでなく様々なメタデータを保持 25 コードキャッシュによる⾼高速化
- 26. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 遅延コンパイル • On Demandでメソッドをコンパイル • デフォルトは true – 8u31までは試験的オプションのためfalse 26 -‐-‐lazy-‐compilation=true|false
- 27. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 202: Class Filter • JEP 202: Nashorn Class Filter hjps://bugs.openjdk.java.net/browse/JDK-‐8043717 • JavaScriptを使うJavaアプリケーション側で実装 – jdk.nashorn.api.scripting.ClassFilter 27 JavaScriptからJavaクラスへのアクセスを抑⽌止
- 28. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ClassFilter実装例例 import jdk.nashorn.api.scripting.ClassFilter; class MyFilter implements ClassFilter { @Override public boolean exposeToScripts(String s) { if (s.compareTo("java.io.File") == 0) return false; return true; } } 28 java.io.Fileを制限したい場合
- 29. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | ECMAScript 6の段階的なサポート 29
- 30. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 203: Lexically-‐scoped variable and constant declaraIons • -‐-‐language=es5|es6 – デフォルトはes5 – const、letを使う場合は-‐-‐language=es6が必須 • let – ブロックに含まれるスコープ内変数の宣⾔言に利利⽤用 • const – letと同様、constを使って宣⾔言した定数はブロック内に⽣生存範囲を限定 30 スコープ内変数（let）や定数（const）の宣⾔言
- 31. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | // let let a=2; function f(x) { // ここではaは2 if(x) { let a=42; } // aは2のまま } // var var a=2; function f(x) { // ここではaは未定義 if(x) { var a=42; } // x次第でaは42もしくは未定義 } 31 letとvar
- 32. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | // 1) 構⽂文エラー function f(x) { const b=1; // 代⼊入不不可 b = 99; } // 2) スコープその1 function f(x) { const b=1; var z=b+1; //z=2 } //bは未定義 var y=b+1; 32 // 3) スコープその2 function f(x) { const b=1; var z =b+1; //z=2 } //bは定義可能 const b = 10; const
- 33. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Server Side JavaScript 33
- 34. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Server Side JavaScript… • JVMで動作するNode.js互換フレームワーク – Nodyn • Vert.x + Dyn.JS + Nejy – Trieme • apigeeによるNode.js互換フレームワーク • 最近はやりのReacIve Programming – RxJS – React.JS などなど 34
- 35. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 35 hVps://blogs.oracle.com/theaquarium/entry/project_avatar_update そんな時代もあったね...
- 36. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | In the future... 36
- 37. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | In the Future • 地道な改善 – ウォームアップ時間短縮のための改善 – OpImisIc Typing、Code Persistenceの改善 • Java 9 – ECMAScript 6の完全サポート – Parser API for Nashorn (JEP 236) – Java Flight Recorder • JavaScript Profiler • Nashorn⽤用のタグ ...などなど 37 Java 8u60、9、その先
- 38. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 地道な改善 • JSONパース時の性能向上のために – プロパティ情報などの⼩小さなJSONオブジェクトを取り扱う場合、 PropertyHashMap#findElement を使うと遅かった。 jdk.nashorn.internal.parser.JSONParserを書き換え 38 例例えば8u60では
- 39. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Java Flight Recorder 39 JavaScript Profilerの可能性
- 40. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 236: Parser API for Nashorn • ⽬目的 – ECMAScriptのコードをASTとして表現するためのParser API – Visitorパターン – 内部実装パッケージ (jdk.nashorn.internal.ir) を使わせない • 注意 – Java API（スクリプトレベルのAPIではない） – 可能な限りECMAScriptの仕様に基づいてASTノードを表現 40 ECMAScript ASTのための公開API
- 41. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | JEP 236: Parser API for Nashorn • JDK9 b55以後で試すことが できる • JavaDoc – hjps://bugs.openjdk.java.net/ browse/JDK-‐8048176 41 jdk.nashorn.api.tree
- 42. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | まとめ 42
- 43. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | まとめ • 8u20、8u40でパフォーマンス向上の ための機能が追加されました • 今後もNashornの開発は続⾏行行します • 是⾮非フィードバックをお願いします 43
- 44. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Nashorn Project • Nashorn Mailing List – nashorn-‐dev@openjdk.java.net • Nashorn Wiki – hjps://wiki.openjdk.java.net/display/Nashorn/Main • DEVELOPER_README – hjp://hg.openjdk.java.net/jdk8u/jdk8u-‐dev/nashorn/file/Ip/docs/ DEVELOPER_README • Nashorn -‐ JavaScript for the JVM – hjp://blogs.oracle.com/nashorn/ 44 hjp://openjdk.java.net/projects/nashorn/
- 45. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | Safe Harbor Statement The preceding is intended to outline our general product direcIon. It is intended for informaIon purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or funcIonality, and should not be relied upon in making purchasing decisions. The development, release, and Iming of any features or funcIonality described for Oracle’s products remains at the sole discreIon of Oracle. 45
- 46. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. | 46
- 48. Copyright © 2015, Oracle and/or its affiliates. All rights reserved. |