messenger_interfaces.php

<?php

// PreHandlerInterface.php
interface PreHandlerInterface
{
    /**
     * Should contains what you want to do before handling the message
     */
    public function preHandle(object $message);
    
    /**
     * Returns if the class should call `preHandle` for this message.
     */
    public function supports(object $message): bool;
} 

// PostHandlerInterface.php
interface PostHandlerInterface
{
    /**
     * Contains what you want to do after the message is handled.
     * $result contains the return of the handler
     */
    public function postHandle(object $message, $result);
    
    /** 
     * Return if the class should call `postHandle` for this message.
     */ 
    public function supports(object $message): bool;
}