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Commitebe8ada

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use backbone models from nashorn
1 parent7172f3d commitebe8ada

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3 files changed

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3 files changed

+92
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‎res/nashorn6.js

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load('http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js');
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load('http://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js');
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// simple backbone model:
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// valueOfGoods will automatically be calculated when stock or price changes
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varProduct=Backbone.Model.extend({
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defaults:{
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stock:0,
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price:0.0,
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name:'',
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valueOfGoods:0.0
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},
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initialize:function(){
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this.on('change:stock change:price',function(){
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varstock=this.get('stock');
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varprice=this.get('price');
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varvalueOfGoods=this.getValueOfGoods(stock,price);
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this.set('valueOfGoods',valueOfGoods);
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});
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},
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getValueOfGoods:function(stock,price){
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returnstock*price;
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}
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});
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varproduct=newProduct();
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product.set('name','Pencil');
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product.set('stock',1000);
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product.set('price',3.99);
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// pass backbone model to java method
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varNashorn6=Java.type('com.winterbe.java8.Nashorn6');
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Nashorn6.getProduct(product.attributes);
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// bind java object to backbone model and pass result back to java
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varcalculate=function(javaProduct){
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varmodel=newProduct();
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model.set('name',javaProduct.name);
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model.set('price',javaProduct.price);
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model.set('stock',javaProduct.stock);
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returnmodel.attributes;
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};

‎src/com/winterbe/java8/Nashorn6.java

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packagecom.winterbe.java8;
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importjdk.nashorn.api.scripting.ScriptObjectMirror;
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importjavax.script.Invocable;
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importjavax.script.ScriptEngine;
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importjavax.script.ScriptEngineManager;
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/**
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* Using Backbone Models from Nashorn.
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*
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* @author Benjamin Winterberg
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*/
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publicclassNashorn6 {
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publicstaticvoidmain(String[]args)throwsException {
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ScriptEngineengine =newScriptEngineManager().getEngineByName("nashorn");
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engine.eval("load('res/nashorn6.js')");
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Invocableinvocable = (Invocable)engine;
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Productproduct =newProduct();
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product.setName("Rubber");
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product.setPrice(1.99);
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product.setStock(1337);
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ScriptObjectMirrorresult = (ScriptObjectMirror)
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invocable.invokeFunction("calculate",product);
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System.out.println(result.get("name") +": " +result.get("valueOfGoods"));
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}
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publicstaticvoidgetProduct(ScriptObjectMirrorresult) {
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System.out.println(result.get("name") +": " +result.get("valueOfGoods"));
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}
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}

‎src/com/winterbe/java8/Product.java

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privateStringname;
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privatedoubleprice;
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privateintstock;
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privatedoublevalueOfGoods;
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publicdoublegetValueOfGoods() {
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returnvalueOfGoods;
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}
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publicvoidsetValueOfGoods(doublevalueOfGoods) {
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this.valueOfGoods =valueOfGoods;
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}
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publicStringgetName() {
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returnname;

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