package redbridge;

import java.io.StringReader;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;

public class MemoryLeak {
    private MemoryLeak() {
        try {
            ScriptEngineManager man = new ScriptEngineManager();
            long end = System.currentTimeMillis() + (5 * 60000);
            System.out.println("Generating garbage for 5 mins...");
            while(end > System.currentTimeMillis()) {
                /*
                 * creating the engine here corresponds to our real-world
                 * case, but you can move the two wollowing lines outside the
                 * loop with the same result
                 */
                ScriptEngine engine = man.getEngineByExtension("rb");
                engine.eval(new StringReader("def methodA() y = 10 end"));
                ((Invocable)engine).invokeFunction("methodA");
                /*
                 * We'll do a small wait here to let the VM breathe...
                 */
                Thread.sleep(5);
            }
            /*
             * And here we'll simply hang the system so that 
             * a memory dump can be created etc...
             */
            System.out.println("Garbage generated, hanging...");
            synchronized(this) {
                this.wait();
            }
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws ScriptException {
        new MemoryLeak();
    }
}