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package org.zodiac.reactor.event;

import org.springframework.context.PayloadApplicationEvent;
import org.springframework.core.ResolvableType;

/**
 * Dynamic generic events, which are used to dynamically publish events that support generics.
 *  *     //Equivalent to a publish event: EntityModifyEvent<UserEntity>
 *     eventPublisher
 *          .publishEvent(new GenericsPayloadApplicationEvent<>(this, new EntityModifyEvent<>(oldEntity, newEntity), UserEntity.class));
 *
 *      //Only listen to the same generic events
 *      @EventListener
 *      public handleEvent(EntityModifyEvent<UserEntity> event){
 *
 *      }
 * 
 *
 */
public class GenericsPayloadApplicationEvent extends PayloadApplicationEvent {

    private static final long serialVersionUID = 3745888943307798710L;

    /*List of generics.*/
    private transient Class[] generics;

    /*The type of event.*/
    private transient Class eventType;

    /**
     * @param source The event source
     * @param payload The event, it can't be anonymous inner classes.
     * @param generics List of generics.
     */
    public GenericsPayloadApplicationEvent(Object source, E payload, Class... generics) {
        super(source, payload);
        this.generics = generics;
        this.eventType = payload.getClass();
    }

    @Override
    public ResolvableType getResolvableType() {
        return ResolvableType.forClassWithGenerics(PayloadApplicationEvent.class
                , ResolvableType.forClassWithGenerics(eventType, generics));
    }

}