GraalVM JavaScript (GraalVM EE Native 21.0.0.2)Copy

/Library/Java/JavaVirtualMachines/graalvm-ee-java11-21.0.0.2/Contents/Home/bin/node --version
v12.20.1Copy

/Library/Java/JavaVirtualMachines/graalvm-ee-java11-21.0.0.2/Contents/Home/bin/npm --version
6.14.10Copy

/Library/Java/JavaVirtualMachines/graalvm-ee-java11-21.0.0.2/Contents/Home/bin/npm init     
package name: (npm) graal-node-app
version: (1.0.0) 1.0.0
description: 
entry point: (index.js) 
test command: 
git repository: 
keywords: 
author: 
license: (ISC) 
About to write to /chapter7/js/npm/package.json:
{
  "name": "graal-node-app",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" andand exit 1"
  },
  "author": "",
  "license": "ISC"
}
Is this OK? (yes)Copy

/Library/Java/JavaVirtualMachines/graalvm-ee-java11-21.0.0.2/Contents/Home/bin/npm install --save express
npm notice created a lockfile as package-lock.json. You should commit this file.
npm WARN [email protected] No description
npm WARN [email protected] No repository field.
+ [email protected]
added 50 packages from 37 contributors and audited 50 packages in 6.277s
found 0 vulnerabilitiesCopy

var express = require('express');
var app = express();
app.get('/', function(request, response) {
    var responseString = "<h1>Hello Graal Node </h1>";
    response.send(responseString);
});
app.listen(8080, function() {
    console.log('Started the server at 8080')
});Copy

/Library/Java/JavaVirtualMachines/graalvm-ee-java11-21.0.0.2/Contents/Home/bin/node index.js 
Started the server at 8080Copy

var express = require('express');
var app = express();
app.get('/', function(request, response) {
    var responseString = "<h1>Hello Graal Node </h1>";
    response.send(responseString);
});
app.get('/poly', function(request, response) {
    var responseString = "<h1>Hello Graal Polyglot </h1>";
    var array = Polyglot.eval("python", "[1,2,3,4, 100,                              200, 300, 400]")
    responseString = responseString + "<ul>";
    for (let index = 0; index < array.length; index++) {
        responseString = responseString + "<li>";
        responseString = responseString + array[index];
        responseString = responseString + "</li>";
    }
    responseString = responseString + "</ul>";
    response.send(responseString);
});Copy

app.listen(8080, function() {
    console.log('Started the server at 8080')
});Copy

/Library/Java/JavaVirtualMachines/graalvm-ee-java11-21.0.0.2/Contents/Home/bin/node --jvm --polyglot index.js
Started the server at 8080Copy

import org.graalvm.polyglot.*;
import org.graalvm.polyglot.proxy.*;Copy

public class FibonacciCalculatorPolyglot{
    static String JS_SNIPPET =     "(function logTotalTime(param){console.log('total(from         JS) : '+param);})";
    public int[] findFibonacci(int count) {
        int fib1 = 0;
        int fib2 = 1;
        int currentFib, index;
        int [] fibNumbersArray = new int[count];
        for(index=2; index < count; ++index ) {    
            currentFib = fib1 + fib2;    
            fib1 = fib2;    
            fib2 = currentFib;    
            fibNumbersArray[index - 1] = currentFib;
        }
        return fibNumbersArray;
    }Copy

    public static void main(String args[]){    
        FibonacciCalculatorPolyglot fibCal             = new FibonacciCalculatorPolyglot();
        long startTime = System.currentTimeMillis();
        long now = 0;
        long last = startTime;
        for (int i = 1000000000; i < 1000000010; i++) {
            int[] fibs = fibCal.findFibonacci(i);
            
            long total = 0;
            for (int j=0; j<fibs.length; j++) {
                total += fibs[j];
            }
            now = System.currentTimeMillis();
            System.out.printf("%d (%d ms)%n", i , now – last);
            last = now;
        }
        long endTime = System.currentTimeMillis();
        long totalTime =             System.currentTimeMillis() - startTime;
        System.out.printf("total (from Java): (%d ms)%n",                          totalTime);  
        try (Context context = Context.create()) {
            Value value = context.eval("js", JS_SNIPPET);
            value.execute(totalTime);
        }
    }
}Copy

static String JS_SNIPPET = "(function logTotalTime(param){console.log('total(from JS) : '+param);})";Copy

import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Value;Copy

try (Context context = Context.create()) {
    Value value = context.eval("js", JS_SNIPPET);
    value.execute(totalTime);
}Copy

Context context = Context.newBuilder().allowIO(true).build();Copy

Context ctx =    Context.newBuilder().allowAllAccess(true).build();
    File path = new File("/path/to/scriptfile");
    Source pythonScript =         Source.newBuilder("python", new File(path,            "pythonScript.py")).build();
    ctx.eval(pythonScript)Copy

public class HelloGraalPolyglot {
    public static void main(String[] args) {
        System.out.println(args[0]);
    }
}Copy

var hello = Java.type('HelloGraalPolyglot');
hello.main(["Hello from JavaScript"]);Copy

js --jvm --vm.cp=. hellograalpolyglot.jsCopy

js --jvm --vm.cp=. hellograalpolyglot.js
Hello from JavaScriptCopy

app.get('/fibonacci', function(request, response) {
    var fibonacciCalculatorClass =        Java.type("FibonacciCalculatorPolyglot");
    var fibonacciCalculatorObject = new         fibonacciCalculatorClass();
    //fibonacciCalculatorClass.class.static.main([""]);
    var array =        fibonacciCalculatorObject.findFibonacci(10);
    var responseString =         "<h1>Hello Graal Polyglot - Fibonacci numbers </h1>";
    responseString = responseString + "<ul>";
    for (let index = 0; index < array.length; index++) {
        responseString = responseString + "<li>";
        responseString = responseString + array[index];
        responseString = responseString + "</li>";
    }
    responseString = responseString + "</ul>";
    response.send(responseString);
});Copy

/Library/Java/JavaVirtualMachines/graalvm-ee-java11-21.0.0.2/Contents/Home/bin/node --jvm --polyglot index.js
Started the server at 8080Copy

--language:nfi
--language:python
--language:regex
--language:wasm
--language:java
--language:llvm
--language:js
--language:rubyCopy

native-image --language:js FibonacciCalculatorPolyglotCopy

./fibonaccicalculatorpolyglotCopy

var helloMathMessage = " Hello Math.js Variable";
function add(a, b) {
    return a+b;
}
function subtract(a, b) {
    return a-b;
}
function multiply(a, b) {
    return a*b;
}Copy

import java.io.File;
import org.graalvm.polyglot.Context;
import org.graalvm.polyglot.Source;
import org.graalvm.polyglot.Value;Copy

public void runMathJS() {
  Context ctx = Context.create("js");
  try {
    File mathJSFile = new File("./math.js");
    ctx.eval(Source.newBuilder("js", mathJSFile).build());Copy

    Value addFunction =        ctx.getBindings("js").getMember("add");
    Value subtractFunction =        ctx.getBindings("js").getMember("subtract");
    Value multiplyFunction =         ctx.getBindings("js").getMember("multiply");
    Value helloMathMessage =        ctx.getBindings("js").getMember("helloMathMessage");
    System.out.println("Binding Keys :" +        ctx.getBindings("js").getMemberKeys());Copy

    Integer addResult = addFunction.execute(30, 20).asInt();
    Integer subtractResult = subtractFunction.execute(30,            20).asInt();
    Integer multiplyResult = multiplyFunction.execute(30,            20).asInt();
    System.out.println(("Add Result "+ addResult+ "        Subtract Result "+ subtractResult+ " Multiply         Result "+ multiplyResult));
    System.out.println("helloMathMessage : " +        helloMathMessage.toString());
}Copy

    Thread thread = new Thread(new Runnable() {
        @Override
        public void run() {
            while (true) {
                Integer addResult =                     addFunction.execute(30, 20).asInt();
                Integer subtractResult =                    subtractFunction.execute(30, 20).asInt();
                Integer multiplyResult =                    multiplyFunction.execute(30, 20).asInt();
            }
        }
    });
    thread.start();Copy

    while (true) {
        Integer addResult =             addFunction.execute(30, 20).asInt();
        Integer subtractResult =            subtractFunction.execute(30, 20).asInt();
        Integer multiplyResult =            multiplyFunction.execute(30, 20).asInt();
        }
        }  catch (Exception e) {
            System.out.println("Exception : " );
            e.printStackTrace();
        }
    }Copy

$ java MathJSCallerThreaded (docker-desktop/bozo-book-library-dev)
Binding Keys :[helloMathMessage, add, subtract, multiply]
java.lang.IllegalStateException: Multi threaded access requested by thread Thread[Thread-3,5,main] but is not allowed for language(s) js.
…..Copy

    public void runMathJS() {
        Context ctx = Context.create("js");
        try {
            File mathJSFile = new File("./math.js");
            ctx.eval(Source.newBuilder                ("js", mathJSFile).build());
            Value addFunction =               ctx.getBindings("js").getMember("add");
            Value subtractFunction =               ctx.getBindings("js").getMember("subtract");
            Value multiplyFunction =               ctx.getBindings("js").getMember("multiply");
            Value helloMathMessage =               ctx.getBindings("js")               .getMember("helloMathMessage");
            System.out.println("Binding Keys :" + ctx.            getBindings("js").getMemberKeys());
            while (true) {
                Integer addResult =                     addFunction.execute(30, 20).asInt();
                Integer subtractResult =                    subtractFunction.execute(30, 20).asInt();
                Integer multiplyResult =                    multiplyFunction.execute(30, 20).asInt();
}Copy

Thread thread = new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            Context ctx = Context.create("js");
            ctx.eval(Source.newBuilder("js",                mathJSFile).build());
            Value addFunction =               ctx.getBindings("js").getMember("add");
            Value subtractFunction =               ctx.getBindings("js").getMember("subtract");
            Value multiplyFunction =               ctx.getBindings("js").getMember("multiply");
            Value helloMathMessage =               ctx.getBindings("js")               .getMember("helloMathMessage");
            while (true) {
                Integer addResult =                addFunction.execute(30, 20).asInt();
                Integer subtractResult =                  subtractFunction.execute(30, 20).asInt();
                Integer multiplyResult =                  multiplyFunction.execute(30, 20).asInt();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
});
thread.start();Copy

Thread thread = new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            // Solution 2
            while (true) {
                synchronized(ctx) {
                Integer addResult =                     addFunction.execute(30, 20).asInt();
                Integer subtractResult =                    subtractFunction.execute(30, 20).asInt();
                Integer multiplyResult =                    multiplyFunction.execute(30, 20).asInt();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
});
thread.start();Copy

while (true) {
    synchronized(ctx) {
        Integer addResult =             addFunction.execute(30, 20).asInt();
        Integer subtractResult =            subtractFunction.execute(30, 20).asInt();
        Integer multiplyResult =            multiplyFunction.execute(30, 20).asInt();
    }
}Copy