Nashorn in the future (Japanese)

Nashorn in the Future

Oracle Corporation JapanFusion Middleware Business UnitNISHIKAWA, Akihiro

201548

Copyright 2015, Oracle and/or its aliates. 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 Oracles products remains at the sole discreIon of Oracle.

2


Agenda

What's Nashorn?

8u20

8u40

In the future...

1

2

3

4

3


Whats Nashorn?

4


Nashorn

Rhino

InvokeDynamic (JSR-292) Proof of Concept

5

Java 8JavaScript Engine (JEP 174)


Nashorn

ECMAScript-262 EdiIon 5.1

javax.script (JSR 223) API

JavaJavaScript

jjs

Java 8JavaScript Engine (JEP 174)

6


jjs Hello World Lambda Expression, Stream

jjs scripting Web API

jjs fx WebView

7


Lambda ExpressionFuncIon // Java array.stream().sorted(Comparator.naturalOrder()) .forEach( t -> sortedArray.add(t) ); // Nashorn array.stream().sorted(Comparator.naturalOrder()) .forEach(function(t) sortedArray.add(t));

8


Java(1)ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName("nashorn"); // engine.eval("print('hello world')"); // hello world engine.eval(new FileReader(hello.js)); // hello.js

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Java(2)

engine.eval("function hello(name){ print('Hello, ' + name); }"); Invocable inv=(Invocable)engine; // Hello, Taro Object obj= inv.invokeFunction("hello","Taro");

10

JavaScriptfunc:on


Java(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();

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Script func:onInterface


8u20

12


8u20

JIT/JDK

13

20148


const var

false

8u40const

14

--const-as-var=true|false


ScriptJava PackageClass

false

15

--no-java=true|false (-nj)


ECMAScript

Java.typeExtension -scripting

16

--no-syntax-extensions (-nse)


#sourceURL@sourceURL

Eval//# sourceURL=myScript.js @sourceURL=myScript.js

17

JDK-8032068 : implement @sourceURL and #sourceURL direc:ves


8u20

Java engine.eval(new URLReader(myScriptURL));

JavaScript load(url);

18

JDK-8021350 : Share script classes between threads/globals within context


8u40

19


8u40

OpImisIc typing (JEP 196) Code Persistence (JEP 194)

Class Filter (JEP 202)

ECMAScript 6 Lexical-scoped variables and constant deniIon (JEP 203)

20

JEP


JEP 196: OpImisIc Typing

type

--optimistic-types=true|false (-ot) false

21

Java

int long

double

Object


JEP 196: OpImisIc Typing

nashorn.typeInfo.maxFiles 0

nashorn.typeInfo.cacheDir Windows: ${java.io.tmpdir}\com.oracle.java.NashornTypeInfo LinuxSolaris: ~/.cache/com.oracle.java.NashornTypeInfo Mac OS X: ~/Library/Caches/com.oracle.java.NashornTypeInfo

22


JEP 194: Code Persistence

23



--class-cache-size=50 (-ccs) 50

--persistent-code-cache=true|false (-pcc) OpImisIc type informaIon false

24



-pcc nashorn_code_cache nashorn.persistent.code.cache

25


On Demand true 8u31false

26

--lazy-compilation=true|false


JEP 202: Class Filter

JEP 202: Nashorn Class Filter hjps://bugs.openjdk.java.net/browse/JDK-8043717

JavaScriptJava jdk.nashorn.api.scripting.ClassFilter

27

JavaScriptJava


ClassFilter

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


ECMAScript 6

29


JEP 203: Lexically-scoped variable and constant declaraIons

--language=es5|es6 es5 constlet--language=es6

let

constletconst

30

letconst


// let let a=2; function f(x) { // a2 if(x) { let a=42; } // a2}

// var var a=2; function f(x) { // a if(x) { var a=42; } // xa42}

31

letvar


// 1) function f(x) { const b=1; // b = 99; }

// 2) 1function f(x) { const b=1; var z=b+1; //z=2 } //bvar y=b+1;

32

// 3) 2function f(x) { const b=1; var z =b+1; //z=2 } //bconst b = 10;

const


Server Side JavaScript

33


Server Side JavaScript JVMNode.js Nodyn Vert.x + Dyn.JS + Nejy

Trieme apigeeNode.js

ReacIve Programming RxJS React.JS

34


In the future...

36


In the Future

OpImisIc TypingCode Persistence

Java 9 ECMAScript 6 Parser API for Nashorn (JEP 236) Java Flight Recorder JavaScript Proler Nashorn

... 37

Java 8u609


JSON JSON PropertyHashMap#findElement

jdk.nashorn.internal.parser.JSONParser

38

8u60


Java Flight Recorder

39

JavaScript Proler


JEP 236: Parser API for Nashorn

ECMAScriptASTParser API Visitor (jdk.nashorn.internal.ir)

Java APIAPI ECMAScriptAST

40

ECMAScript ASTAPI


JEP 236: Parser API for Nashorn

JDK9 b55 JavaDochjps://bugs.openjdk.java.net/browse/JDK-8048176

41

jdk.nashorn.api.tree


42


8u208u40

Nashorn

43


Nashorn Project

Nashorn Mailing List [email protected]

Nashorn Wiki hjps://wiki.openjdk.java.net/display/Nashorn/Main

DEVELOPER_README hjp://hg.openjdk.java.net/jdk8u/jdk8u-dev/nashorn/le/Ip/docs/DEVELOPER_README

Nashorn - JavaScript for the JVM hjp://blogs.oracle.com/nashorn/

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hjp://openjdk.java.net/projects/nashorn/


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 Oracles products remains at the sole discreIon of Oracle.

45


46

Technology

Nashorn in the future (Japanese)