package org.infinispan.notifications.cachelistener.event;
/**
* This event subtype is passed in to any method annotated with {@link org.infinispan.notifications.cachelistener.annotation.CacheEntryRemoved}.
* <p />
* The {@link #getValue()} method would return the <i>old</i> value prior to deletion, if <tt>isPre()</tt> is <tt>true</tt>.
* If <tt>isPre()</tt> is <tt>false</tt>, {@link #getValue()} will return <tt>null</tt>.
*
* @author Manik Surtani
* @since 4.0
*/
public interface CacheEntryRemovedEvent<K, V> extends CacheEntryEvent<K, V> {
/**
* Retrieves the value of the entry being deleted.
* <p />
* @return the value of the entry being deleted, if <tt>isPre()</tt> is <tt>true</tt>. <tt>null</tt> otherwise.
*/
V getValue();
/**
* Regardless of whether <tt>isPre()</tt> is <tt>true</tt> or is
* <tt>false</tt>, this method returns the value of the entry being
* deleted. This method is useful for situations where cache listeners
* need to know what the old value being deleted is when getting
* <tt>isPre()</tt> is <tt>false</tt> callbacks.
*
* @return the value of the entry being deleted, regardless of
* <tt>isPre()</tt> value
*/
V getOldValue();
/**
* This will be true if the write command that caused this had to be retried again due to a topology change. This
* could be a sign that this event has been duplicated or another event was dropped and replaced
* (eg: ModifiedEvent replaced CreateEvent)
* @return Whether the command that caused this event was retried
*/
boolean isCommandRetried();
}