package com.atlassian.cache.impl;
   
   import com.atlassian.cache.CachedReferenceListener;
   
   /**
    * This interface is designed to support {@code CachedReference} implementations in working with {@code CachedReferenceListener}s.
    * <p>
    * The main usage pattern for which this is designed is to use delegation for add/remove (therefore the listeners are
    * managed by the this interface) and then use notify* methods to create and deliver the actual events.
   */
  public interface CachedReferenceListenerSupport<V>
  {
      void add(CachedReferenceListener<V> listener, boolean includeValues);
      void remove(CachedReferenceListener<V> listener);
  
      void notifyEvict(V oldValue);
      void notifySet(V value);
      void notifyReset(V oldValue);
  
      CachedReferenceListenerSupport EMPTY = new CachedReferenceListenerSupport()
      {
          @Override
          public void add(CachedReferenceListener listener, boolean includeValues)
          {
          }
  
          @Override
          public void remove(CachedReferenceListener listener)
          {
          }
  
          @Override
          public void notifyEvict(Object oldValue)
          {
          }
  
          @Override
          public void notifySet(Object value)
          {
          }
  
          @Override
          public void notifyReset(Object oldValue)
          {
          }
      };
  }