Mega Code Archive

 

Categories / Java Tutorial / Development

 

Any script have to be compiled into intermediate code

This compilation takes a relatively large amount of CPU cycles. With the Invocable interface you can save time by storing the compiled intermediate code for reuse. import javax.script.Invocable; import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; public class InvocableDemo {   public static void main(String[] args) throws Exception {     ScriptEngineManager manager = new ScriptEngineManager();     ScriptEngine engine = manager.getEngineByName("js");     engine.eval("function add (a, b) {c = a + b; return c; }");     Invocable jsInvoke = (Invocable) engine;     Object result1 = jsInvoke.invokeFunction("add", new Object[] { 10, 5 });     System.out.println(result1);     Adder adder = jsInvoke.getInterface(Adder.class);     int result2 = adder.add(10, 5);     System.out.println(result2);   } } interface Adder {   int add(int a, int b); }