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With inspiration from other libraries

There is a newer version: 2.12.15

package org.mvel2.integration;

import java.util.LinkedList;
import java.util.List;

public class GlobalListenerFactory {
  private static List propertyGetListeners;
  private static List propertySetListeners;

  public static boolean hasGetListeners() {
    return propertyGetListeners != null && !propertyGetListeners.isEmpty();
  }

  public static boolean hasSetListeners() {
    return propertySetListeners != null && !propertySetListeners.isEmpty();
  }

  public static boolean registerGetListener(Listener getListener) {
    if (propertyGetListeners == null) propertyGetListeners = new LinkedList();
    return propertyGetListeners.add(getListener);
  }

  public static boolean registerSetListener(Listener getListener) {
    if (propertySetListeners == null) propertySetListeners = new LinkedList();
    return propertySetListeners.add(getListener);
  }


  public static void notifyGetListeners(Object target, String name, VariableResolverFactory variableFactory) {
    if (propertyGetListeners != null) {
      for (Listener l : propertyGetListeners) {
        l.onEvent(target, name, variableFactory, null);
      }
    }
  }

  public static void notifySetListeners(Object target, String name, VariableResolverFactory variableFactory, Object value) {
    if (propertySetListeners != null) {
      for (Listener l : propertySetListeners) {
        l.onEvent(target, name, variableFactory, value);
      }
    }
  }

  public static void disposeAll() {
    propertyGetListeners = null;
    propertySetListeners = null;
  }
}