package org.infinispan.notifications.cachelistener.filter;
import org.infinispan.metadata.Metadata;
/**
* A converter that can be used to convert the value given for an event. This converter allows for converting based
* on the previous value as well as the new updated value. The old value and old metadata are the previous values and
* the new value and new metadata are the new values even for pre and post events.
* @author wburns
* @since 7.0
*/
public interface CacheEventConverter<K, V, C> {
/**
* Converts the given newValue into something different possibly.
* @param key The key for the entry that was changed for the event
* @param oldValue The previous value before the event takes place
* @param oldMetadata The old value before the event takes place
* @param newValue The new value for the entry after the event takes place
* @param newMetadata The new metadata for the entry after the event takes place
* @param eventType The type of event that is being raised
* @return The converted value to be used in the event
*/
public C convert(K key, V oldValue, Metadata oldMetadata, V newValue, Metadata newMetadata, EventType eventType);
}