Make it simpler to listen to Cache events by providing an adapter

public class CacheEntryListenerAdapter<T> implements CacheEntryListener<T>
{
    @Override
    public void cacheEntryAdded(CacheEntryEvent<T> event)
    {
        // Do nothing by default
    }

    @Override
    public void cacheEntryRemoved(CacheEntryEvent<T> event)
    {
        // Do nothing by default
    }

    @Override
    public void cacheEntryModified(CacheEntryEvent<T> event)
    {
        // Do nothing by default
    }
}