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@winterbe
Created April 1, 2014 18:03
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Using Backbone Models from Nashorn JS Engine
package com.winterbe.java8;
import jdk.nashorn.api.scripting.ScriptObjectMirror;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
* Using Backbone Models from Nashorn.
*
* @author Benjamin Winterberg
*/
public class Nashorn6 {
public static void main(String[] args) throws Exception {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
engine.eval("load('res/nashorn6.js')");
Invocable invocable = (Invocable) engine;
Product product = new Product();
product.setName("Rubber");
product.setPrice(1.99);
product.setStock(1337);
ScriptObjectMirror result = (ScriptObjectMirror)
invocable.invokeFunction("calculate", product);
System.out.println(result.get("name") + ": " + result.get("valueOfGoods"));
}
public static void getProduct(ScriptObjectMirror result) {
System.out.println(result.get("name") + ": " + result.get("valueOfGoods"));
}
}
load('http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js');
load('http://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js');
// simple backbone model:
// valueOfGoods will automatically be calculated when stock or price changes
var Product = Backbone.Model.extend({
defaults: {
stock: 0,
price: 0.0,
name:'',
valueOfGoods: 0.0
},
initialize: function() {
this.on('change:stock change:price', function() {
var stock = this.get('stock');
var price = this.get('price');
var valueOfGoods = this.getValueOfGoods(stock, price);
this.set('valueOfGoods', valueOfGoods);
});
},
getValueOfGoods: function(stock, price) {
return stock * price;
}
});
var product = new Product();
product.set('name', 'Pencil');
product.set('stock', 1000);
product.set('price', 3.99);
// pass backbone model to java method
var Nashorn6 = Java.type('com.winterbe.java8.Nashorn6');
Nashorn6.getProduct(product.attributes);
// bind java object to backbone model and pass result back to java
var calculate = function(javaProduct) {
var model = new Product();
model.set('name', javaProduct.name);
model.set('price', javaProduct.price);
model.set('stock', javaProduct.stock);
return model.attributes;
};
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