Passing Parameters to Scripts - Scripting in Java: Integrating with Groovy and JavaScript - page 34

Listing 3-3. Using Global and Engine Scope Bindings of Engines Created by the Same
ScriptEngineManager
// GlobalBindings.java
package com.jdojo.script;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class GlobalBindings {
public static void main(String[] args) {
ScriptEngineManager manager = new ScriptEngineManager();
// Add two numbers to the Bindings of the manager that will be
// shared by all its engines
manager.put("n1", 100);
manager.put("n2", 200);
// Create two JavaScript engines and add the name of the engine
// in the engine scope of the default context of the engines
ScriptEngine engine1 = manager.
getEngineByName("JavaScript");
engine1.put("engineName", "Engine-1");
ScriptEngine engine2 = manager.
getEngineByName("JavaScript");
engine2.put("engineName", "Engine-2");
// Execute a script that adds two numbers and prints the
// result
String script = "var sum = n1 + n2; "
+ "print(engineName + ' - Sum = ' + sum)";
try {
// Execute the script in two engines
engine1.eval(script);
engine2.eval(script);
// Now add a different value for n2 for each engine
engine1.put("n2", 1000);
engine2.put("n2", 2000);
// Execute the script in two engines again
engine1.eval(script);
engine2.eval(script);
}