protected void collectCallback() {
Method[] methods = this.getClass().getDeclaredMethods();
if (callbacks.size() > 0) return;
for (Method method : methods) {
WowMethod wowMethod = new WowMethod(this, method);
if (method.isAnnotationPresent(BeforeSave.class)) {
putAndAdd(Callbacks.Callback.before_save, wowMethod);
}