}

@Managed
interface Item {
   void setName(String n); String getName()

   void setQuantity(int q); int getQuantity()

   void setPrice(float p); float getPrice()

   void setTemperature(Temperature t)
   Temperature getTemperature()

   void setDataFile(File f); File getDataFile()
}

class ItemRules extends RuleSource {
   @Model
   void item(Item item) {
      def data = item.dataFile.text.trim()

package com.acme;

public class DefaultHeatSensor implements HeatSensor {
    public double getTemperature() {
        return 20d;
    }

package com.acme;

interface HeatSensor {
    double getTemperature();

package com.acme;

interface HeatSensor {
    double getTemperature();

package com.acme;

public class DefaultHeatSensor implements HeatSensor {
    public double getTemperature() {
        return 20d;
    }