What method gets called when an entity gets unloaded because there's nobody around it?

I'd need something like this

 

void unload(){

//Clear out extra data here

}

I think the method, which unloads the mobs is the "protected void despawnEntity()" method in the "EntityLiving" class

    /**
     * Makes the entity despawn if requirements are reached
     */
    protected void despawnEntity()
    {
        net.minecraftforge.fml.common.eventhandler.Event.Result result = null;
        if (this.persistenceRequired)
        {
            this.entityAge = 0;
        }
        else if ((this.entityAge & 0x1F) == 0x1F && (result = net.minecraftforge.event.ForgeEventFactory.canEntityDespawn(this)) != net.minecraftforge.fml.common.eventhandler.Event.Result.DEFAULT)
        {
            if (result == net.minecraftforge.fml.common.eventhandler.Event.Result.DENY)
            {
                this.entityAge = 0;
            }
            else
            {
                this.setDead();
            }
        }
        else
        {
            EntityPlayer entityplayer = this.worldObj.getClosestPlayerToEntity(this, -1.0D);

            if (entityplayer != null)
            {
                double d0 = entityplayer.posX - this.posX;
                double d1 = entityplayer.posY - this.posY;
                double d2 = entityplayer.posZ - this.posZ;
                double d3 = d0 * d0 + d1 * d1 + d2 * d2;

                if (this.canDespawn() && d3 > 16384.0D)
                {
                    this.setDead();
                }

                if (this.entityAge > 600 && this.rand.nextInt(800) == 0 && d3 > 1024.0D && this.canDespawn())
                {
                    this.setDead();
                }
                else if (d3 < 1024.0D)
                {
                    this.entityAge = 0;
                }
            }
        }
    }

This isnt an entityliving though, its just an entity.

As far as I can see, there's no specific

Entity

method that's called when the entity is unloaded.

Entity#setDead

will be called, but that's also called any other time the entity is killed/removed (e.g. if it falls out of the world or is killed with

/kill

).

 

Is there a specific reason you need this?