diff --git a/pagetop-admin/src/lib.rs b/pagetop-admin/src/lib.rs
index ddd03cb1..4ddd3279 100644
--- a/pagetop-admin/src/lib.rs
+++ b/pagetop-admin/src/lib.rs
@@ -1,6 +1,6 @@
 use pagetop::prelude::*;
 
-pub const MODULE_ADMIN: &str = "pagetop-admin::module::admin";
+pub_const_handler!(MODULE_ADMIN);
 
 localize!("src/locales");
 
@@ -9,7 +9,7 @@ mod summary;
 pub struct Admin;
 
 impl ModuleTrait for Admin {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         MODULE_ADMIN
     }
 
diff --git a/pagetop-node/src/lib.rs b/pagetop-node/src/lib.rs
index 343a467d..ff4755fd 100644
--- a/pagetop-node/src/lib.rs
+++ b/pagetop-node/src/lib.rs
@@ -1,6 +1,6 @@
 use pagetop::prelude::*;
 
-pub const MODULE_NODE: &str = "pagetop-node::module::node";
+pub_const_handler!(MODULE_NODE);
 
 localize!("src/locales");
 
@@ -10,7 +10,7 @@ mod migration;
 pub struct Node;
 
 impl ModuleTrait for Node {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         MODULE_NODE
     }
 
diff --git a/pagetop-user/src/lib.rs b/pagetop-user/src/lib.rs
index ee49fa8d..22c14c41 100644
--- a/pagetop-user/src/lib.rs
+++ b/pagetop-user/src/lib.rs
@@ -1,6 +1,6 @@
 use pagetop::prelude::*;
 
-pub const MODULE_USER: &str = "pagetop-user::module::user";
+pub_const_handler!(MODULE_USER);
 
 localize!("src/locales");
 
@@ -9,7 +9,7 @@ mod migration;
 pub struct User;
 
 impl ModuleTrait for User {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         MODULE_USER
     }
 
diff --git a/pagetop/src/base/component/anchor.rs b/pagetop/src/base/component/anchor.rs
index 22ab34a0..78febf27 100644
--- a/pagetop/src/base/component/anchor.rs
+++ b/pagetop/src/base/component/anchor.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_ANCHOR: &str = "pagetop::component::anchor";
+pub_const_handler!(COMPONENT_ANCHOR);
 
 pub enum AnchorType {
     Button,
@@ -49,7 +49,7 @@ impl ComponentTrait for Anchor {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_ANCHOR
     }
 
diff --git a/pagetop/src/base/component/block.rs b/pagetop/src/base/component/block.rs
index 4b77ef31..9b0636c1 100644
--- a/pagetop/src/base/component/block.rs
+++ b/pagetop/src/base/component/block.rs
@@ -1,11 +1,8 @@
 use crate::prelude::*;
 
-pub const COMPONENT_BLOCK: &str = "pagetop::component::block";
+pub_const_handler!(COMPONENT_BLOCK);
 
-hook_before_render_component!(
-    HOOK_BEFORE_RENDER_BLOCK = "pagetop::action::before_render_block",
-    Block
-);
+hook_before_render_component!(HOOK_BEFORE_RENDER_BLOCK, Block);
 
 pub struct Block {
     weight    : isize,
@@ -30,7 +27,7 @@ impl ComponentTrait for Block {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_BLOCK
     }
 
diff --git a/pagetop/src/base/component/container.rs b/pagetop/src/base/component/container.rs
index 70271eb1..ad7be745 100644
--- a/pagetop/src/base/component/container.rs
+++ b/pagetop/src/base/component/container.rs
@@ -1,11 +1,8 @@
 use crate::prelude::*;
 
-pub const COMPONENT_CONTAINER: &str = "pagetop::component::container";
+pub_const_handler!(COMPONENT_CONTAINER);
 
-hook_before_render_component!(
-    HOOK_BEFORE_RENDER_CONTAINER = "pagetop::action::before_render_container",
-    Container
-);
+hook_before_render_component!(HOOK_BEFORE_RENDER_CONTAINER, Container);
 
 pub enum ContainerType {
     Header,
@@ -40,7 +37,7 @@ impl ComponentTrait for Container {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_CONTAINER
     }
 
diff --git a/pagetop/src/base/component/form_element/button.rs b/pagetop/src/base/component/form_element/button.rs
index cddb6bdb..f349ea5a 100644
--- a/pagetop/src/base/component/form_element/button.rs
+++ b/pagetop/src/base/component/form_element/button.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_BUTTON: &str = "pagetop::component::form::button";
+pub_const_handler!(COMPONENT_BUTTON);
 
 pub enum ButtonType {
     Button,
@@ -36,7 +36,7 @@ impl ComponentTrait for Button {
         .with_classes(ClassesOp::AddFirst, "form-button")
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_BUTTON
     }
 
diff --git a/pagetop/src/base/component/form_element/date.rs b/pagetop/src/base/component/form_element/date.rs
index 19370e57..2ce8c357 100644
--- a/pagetop/src/base/component/form_element/date.rs
+++ b/pagetop/src/base/component/form_element/date.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_DATE: &str = "pagetop::component::form::date";
+pub_const_handler!(COMPONENT_DATE);
 
 pub struct Date {
     weight      : isize,
@@ -40,7 +40,7 @@ impl ComponentTrait for Date {
         .with_classes(ClassesOp::AddFirst, "form-type-date")
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_DATE
     }
 
diff --git a/pagetop/src/base/component/form_element/form.rs b/pagetop/src/base/component/form_element/form.rs
index 8b562f56..9c80c05a 100644
--- a/pagetop/src/base/component/form_element/form.rs
+++ b/pagetop/src/base/component/form_element/form.rs
@@ -1,11 +1,8 @@
 use crate::prelude::*;
 
-pub const COMPONENT_FORM: &str = "pagetop::component::form";
+pub_const_handler!(COMPONENT_FORM);
 
-hook_before_render_component!(
-    HOOK_BEFORE_RENDER_FORM = "pagetop::action::before_render_form",
-    Form
-);
+hook_before_render_component!(HOOK_BEFORE_RENDER_FORM, Form);
 
 pub enum FormMethod {
     Get,
@@ -39,7 +36,7 @@ impl ComponentTrait for Form {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_FORM
     }
 
diff --git a/pagetop/src/base/component/form_element/hidden.rs b/pagetop/src/base/component/form_element/hidden.rs
index 3da6a4c3..ed24a56f 100644
--- a/pagetop/src/base/component/form_element/hidden.rs
+++ b/pagetop/src/base/component/form_element/hidden.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_HIDDEN: &str = "pagetop::component::form::hidden";
+pub_const_handler!(COMPONENT_HIDDEN);
 
 pub struct Hidden {
     weight: isize,
@@ -17,7 +17,7 @@ impl ComponentTrait for Hidden {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_HIDDEN
     }
 
diff --git a/pagetop/src/base/component/form_element/input.rs b/pagetop/src/base/component/form_element/input.rs
index 8d56b739..b88d4902 100644
--- a/pagetop/src/base/component/form_element/input.rs
+++ b/pagetop/src/base/component/form_element/input.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_INPUT: &str = "pagetop::component::form::input";
+pub_const_handler!(COMPONENT_INPUT);
 
 pub enum InputType {
     Email,
@@ -57,7 +57,7 @@ impl ComponentTrait for Input {
         .with_classes(ClassesOp::AddFirst, "form-type-textfield")
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_INPUT
     }
 
diff --git a/pagetop/src/base/component/grid/column.rs b/pagetop/src/base/component/grid/column.rs
index d0b0e2ed..57b2e51a 100644
--- a/pagetop/src/base/component/grid/column.rs
+++ b/pagetop/src/base/component/grid/column.rs
@@ -1,11 +1,8 @@
 use crate::prelude::*;
 
-pub const COMPONENT_COLUMN: &str = "pagetop::component::grid::column";
+pub_const_handler!(COMPONENT_COLUMN);
 
-hook_before_render_component!(
-    HOOK_BEFORE_RENDER_COLUMN = "pagetop::action::before_render_column",
-    Column
-);
+hook_before_render_component!(HOOK_BEFORE_RENDER_COLUMN, Column);
 
 const SIZE_DEFAULT:  &str = "col-md";
 const SIZE_1_OF_12:  &str = "col-md-1";
@@ -59,7 +56,7 @@ impl ComponentTrait for Column {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_COLUMN
     }
 
diff --git a/pagetop/src/base/component/grid/row.rs b/pagetop/src/base/component/grid/row.rs
index 117cf499..e92dfc3d 100644
--- a/pagetop/src/base/component/grid/row.rs
+++ b/pagetop/src/base/component/grid/row.rs
@@ -1,11 +1,8 @@
 use crate::prelude::*;
 
-pub const COMPONENT_ROW: &str = "pagetop::component::grid::row";
+pub_const_handler!(COMPONENT_ROW);
 
-hook_before_render_component!(
-    HOOK_BEFORE_RENDER_ROW = "pagetop::action::before_render_row",
-    Row
-);
+hook_before_render_component!(HOOK_BEFORE_RENDER_ROW, Row);
 
 pub struct Row {
     weight    : isize,
@@ -28,7 +25,7 @@ impl ComponentTrait for Row {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_ROW
     }
 
diff --git a/pagetop/src/base/component/heading.rs b/pagetop/src/base/component/heading.rs
index 0dbbcdea..5d3e7652 100644
--- a/pagetop/src/base/component/heading.rs
+++ b/pagetop/src/base/component/heading.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_HEADING: &str = "pagetop::component::heading";
+pub_const_handler!(COMPONENT_HEADING);
 
 pub enum HeadingType {
     H1,
@@ -46,7 +46,7 @@ impl ComponentTrait for Heading {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_HEADING
     }
 
diff --git a/pagetop/src/base/component/html.rs b/pagetop/src/base/component/html.rs
index 438684a2..69e9e78d 100644
--- a/pagetop/src/base/component/html.rs
+++ b/pagetop/src/base/component/html.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_HTML: &str = "pagetop::component::html";
+pub_const_handler!(COMPONENT_HTML);
 
 pub struct Html {
     weight    : isize,
@@ -19,7 +19,7 @@ impl ComponentTrait for Html {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_HTML
     }
 
diff --git a/pagetop/src/base/component/icon.rs b/pagetop/src/base/component/icon.rs
index 4722fe63..8bb64e3d 100644
--- a/pagetop/src/base/component/icon.rs
+++ b/pagetop/src/base/component/icon.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_ICON: &str = "pagetop::component::icon";
+pub_const_handler!(COMPONENT_ICON);
 
 pub struct Icon {
     weight    : isize,
@@ -19,7 +19,7 @@ impl ComponentTrait for Icon {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_ICON
     }
 
diff --git a/pagetop/src/base/component/image.rs b/pagetop/src/base/component/image.rs
index 06749f5b..4f8fadac 100644
--- a/pagetop/src/base/component/image.rs
+++ b/pagetop/src/base/component/image.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_IMAGE: &str = "pagetop::component::image";
+pub_const_handler!(COMPONENT_IMAGE);
 
 pub struct Image {
     weight    : isize,
@@ -23,7 +23,7 @@ impl ComponentTrait for Image {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_IMAGE
     }
 
diff --git a/pagetop/src/base/component/menu.rs b/pagetop/src/base/component/menu.rs
index acae967a..6727b3f6 100644
--- a/pagetop/src/base/component/menu.rs
+++ b/pagetop/src/base/component/menu.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_MENUITEM: &str = "pagetop::component::menu_item";
+pub_const_handler!(COMPONENT_MENUITEM);
 
 pub enum MenuItemType {
     Label(String),
@@ -29,7 +29,7 @@ impl ComponentTrait for MenuItem {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_MENUITEM
     }
 
@@ -163,12 +163,9 @@ impl MenuItem {
 
 // Menu.
 
-pub const COMPONENT_MENU: &str = "pagetop::component::menu";
+pub_const_handler!(COMPONENT_MENU);
 
-hook_before_render_component!(
-    HOOK_BEFORE_RENDER_MENU = "pagetop::action::before_render_menu",
-    Menu
-);
+hook_before_render_component!(HOOK_BEFORE_RENDER_MENU, Menu);
 
 pub struct Menu {
     weight    : isize,
@@ -191,7 +188,7 @@ impl ComponentTrait for Menu {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_MENU
     }
 
diff --git a/pagetop/src/base/component/paragraph.rs b/pagetop/src/base/component/paragraph.rs
index 06438b7b..bb7af142 100644
--- a/pagetop/src/base/component/paragraph.rs
+++ b/pagetop/src/base/component/paragraph.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const COMPONENT_PARAGRAPH: &str = "pagetop::component::paragraph";
+pub_const_handler!(COMPONENT_PARAGRAPH);
 
 pub enum ParagraphDisplay {
     XxLarge,
@@ -34,7 +34,7 @@ impl ComponentTrait for Paragraph {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         COMPONENT_PARAGRAPH
     }
 
diff --git a/pagetop/src/base/module/homepage.rs b/pagetop/src/base/module/homepage.rs
index c8635dcf..2676096a 100644
--- a/pagetop/src/base/module/homepage.rs
+++ b/pagetop/src/base/module/homepage.rs
@@ -1,13 +1,13 @@
 use crate::prelude::*;
 
-pub const MODULE_DEFAULT_HOMEPAGE: &str = "pagetop::module::homepage::default";
+pub_const_handler!(MODULE_DEFAULT_HOMEPAGE);
 
 localize!("src/base/module/homepage/locales");
 
 pub struct DefaultHomePage;
 
 impl ModuleTrait for DefaultHomePage {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         MODULE_DEFAULT_HOMEPAGE
     }
 
diff --git a/pagetop/src/base/theme/aliner.rs b/pagetop/src/base/theme/aliner.rs
index bb6e794f..33b2a453 100644
--- a/pagetop/src/base/theme/aliner.rs
+++ b/pagetop/src/base/theme/aliner.rs
@@ -1,13 +1,13 @@
 use crate::prelude::*;
 
-pub const THEME_ALINER: &str = "pagetop::theme::aliner";
+pub_const_handler!(THEME_ALINER);
 
 include!(concat!(env!("OUT_DIR"), "/aliner.rs"));
 
 pub struct Aliner;
 
 impl ThemeTrait for Aliner {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         THEME_ALINER
     }
 
diff --git a/pagetop/src/base/theme/bootsier.rs b/pagetop/src/base/theme/bootsier.rs
index 6dcf5fd0..6edec2e1 100644
--- a/pagetop/src/base/theme/bootsier.rs
+++ b/pagetop/src/base/theme/bootsier.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-pub const THEME_BOOTSIER: &str = "pagetop::theme::bootsier";
+pub_const_handler!(THEME_BOOTSIER);
 
 include!(concat!(env!("OUT_DIR"), "/bootsier.rs"));
 
@@ -9,7 +9,7 @@ localize!("src/base/theme/bootsier/locales");
 pub struct Bootsier;
 
 impl ThemeTrait for Bootsier {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         THEME_BOOTSIER
     }
 
diff --git a/pagetop/src/base/theme/bulmix.rs b/pagetop/src/base/theme/bulmix.rs
index 200c2b63..b0f81c4e 100644
--- a/pagetop/src/base/theme/bulmix.rs
+++ b/pagetop/src/base/theme/bulmix.rs
@@ -1,13 +1,13 @@
 use crate::prelude::*;
 
-pub const THEME_BULMIX: &str = "pagetop::theme::bulmix";
+pub_const_handler!(THEME_BULMIX);
 
 include!(concat!(env!("OUT_DIR"), "/bulmix.rs"));
 
 pub struct Bulmix;
 
 impl ThemeTrait for Bulmix {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         THEME_BULMIX
     }
 
diff --git a/pagetop/src/base/theme/minimal.rs b/pagetop/src/base/theme/minimal.rs
index bcdbe8cf..63c90976 100644
--- a/pagetop/src/base/theme/minimal.rs
+++ b/pagetop/src/base/theme/minimal.rs
@@ -1,11 +1,11 @@
 use crate::prelude::*;
 
-pub const THEME_MINIMAL: &str = "pagetop::theme::minimal";
+pub_const_handler!(THEME_MINIMAL);
 
 pub struct Minimal;
 
 impl ThemeTrait for Minimal {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         THEME_MINIMAL
     }
 }
diff --git a/pagetop/src/core/component/definition.rs b/pagetop/src/core/component/definition.rs
index d43b8f70..0c69f90e 100644
--- a/pagetop/src/core/component/definition.rs
+++ b/pagetop/src/core/component/definition.rs
@@ -1,6 +1,6 @@
 use super::InContext;
 use crate::html::{html, Markup};
-use crate::util;
+use crate::util::{single_type_name, Handler};
 
 pub use std::any::Any as AnyComponent;
 
@@ -13,10 +13,10 @@ pub trait ComponentTrait: AnyComponent + BaseComponent + Send + Sync {
     where
         Self: Sized;
 
-    fn handler(&self) -> &'static str;
+    fn handler(&self) -> Handler;
 
     fn name(&self) -> String {
-        util::single_type_name::<Self>().to_owned()
+        single_type_name::<Self>().to_owned()
     }
 
     fn description(&self) -> Option<String> {
@@ -73,9 +73,9 @@ pub fn component_mut<C: 'static>(component: &mut dyn ComponentTrait) -> &mut C {
 
 #[macro_export]
 macro_rules! hook_before_render_component {
-    ( $ACTION_HANDLER:ident = $handler:literal, $Component:ty ) => {
+    ( $ACTION_HANDLER:ident, $Component:ty ) => {
         paste::paste! {
-            const $ACTION_HANDLER: &str = $handler;
+            $crate::pub_const_handler!($ACTION_HANDLER);
 
             type Action = fn(&$Component, &mut InContext);
 
@@ -92,7 +92,7 @@ macro_rules! hook_before_render_component {
                     }
                 }
 
-                fn handler(&self) -> &'static str {
+                fn handler(&self) -> Handler {
                     $ACTION_HANDLER
                 }
 
diff --git a/pagetop/src/core/hook/all.rs b/pagetop/src/core/hook/all.rs
index ab562311..e98d5ca3 100644
--- a/pagetop/src/core/hook/all.rs
+++ b/pagetop/src/core/hook/all.rs
@@ -1,29 +1,30 @@
 use super::{HookAction, ActionsHolder};
 use crate::LazyStatic;
+use crate::util::Handler;
 
 use std::collections::HashMap;
 use std::sync::RwLock;
 
 // Registered actions.
-static ACTIONS: LazyStatic<RwLock<HashMap<&str, ActionsHolder>>> = LazyStatic::new(||
+static ACTIONS: LazyStatic<RwLock<HashMap<Handler, ActionsHolder>>> = LazyStatic::new(||
     RwLock::new(HashMap::new())
 );
 
 pub fn add_action(action: HookAction) {
     let mut actions = ACTIONS.write().unwrap();
     let action_handler = action.handler();
-    if let Some(holder) = actions.get_mut(action_handler) {
+    if let Some(holder) = actions.get_mut(&action_handler) {
         holder.add(action);
     } else {
         actions.insert(action_handler, ActionsHolder::new_with(action));
     }
 }
 
-pub fn run_actions<B, F>(action_handler: &str, f: F)
+pub fn run_actions<B, F>(action_handler: Handler, f: F)
 where
     F: FnMut(&HookAction) -> B,
 {
-    if let Some(holder) = ACTIONS.read().unwrap().get(action_handler) {
+    if let Some(holder) = ACTIONS.read().unwrap().get(&action_handler) {
         holder.iter_map(f)
     }
 }
diff --git a/pagetop/src/core/hook/definition.rs b/pagetop/src/core/hook/definition.rs
index ae739fa6..5808b6c9 100644
--- a/pagetop/src/core/hook/definition.rs
+++ b/pagetop/src/core/hook/definition.rs
@@ -1,3 +1,5 @@
+use crate::util::Handler;
+
 pub use std::any::Any as AnyHookAction;
 
 pub trait HookActionTrait: AnyHookAction + Send + Sync {
@@ -5,7 +7,7 @@ pub trait HookActionTrait: AnyHookAction + Send + Sync {
     where
         Self: Sized;
 
-    fn handler(&self) -> &'static str;
+    fn handler(&self) -> Handler;
 
     fn weight(&self) -> isize {
         0
diff --git a/pagetop/src/core/module/definition.rs b/pagetop/src/core/module/definition.rs
index 59aec809..e4492ab7 100644
--- a/pagetop/src/core/module/definition.rs
+++ b/pagetop/src/core/module/definition.rs
@@ -1,5 +1,6 @@
+use crate::app;
 use crate::core::hook::HookAction;
-use crate::{app, util};
+use crate::util::{single_type_name, Handler};
 
 #[cfg(feature = "database")]
 use crate::db::MigrationItem;
@@ -10,7 +11,7 @@ pub trait BaseModule {
 
 /// Los módulos deben implementar este *trait*.
 pub trait ModuleTrait: BaseModule + Send + Sync {
-    fn handler(&self) -> &'static str;
+    fn handler(&self) -> Handler;
 
     fn name(&self) -> String {
         self.single_name().to_owned()
@@ -40,6 +41,6 @@ pub trait ModuleTrait: BaseModule + Send + Sync {
 
 impl<M: ?Sized + ModuleTrait> BaseModule for M {
     fn single_name(&self) -> &'static str {
-        util::single_type_name::<Self>()
+        single_type_name::<Self>()
     }
 }
diff --git a/pagetop/src/core/theme/definition.rs b/pagetop/src/core/theme/definition.rs
index 7f64258b..eeaaad2d 100644
--- a/pagetop/src/core/theme/definition.rs
+++ b/pagetop/src/core/theme/definition.rs
@@ -1,10 +1,11 @@
 use crate::app;
 use crate::base::component::{Container, Html};
+use crate::concat_string;
 use crate::config::SETTINGS;
 use crate::core::component::{ComponentTrait, InContext, InContextOp};
 use crate::html::{html, Favicon, Markup};
 use crate::response::page::Page;
-use crate::{concat_string, util};
+use crate::util::{single_type_name, Handler};
 
 pub trait BaseTheme {
     fn single_name(&self) -> &'static str;
@@ -12,7 +13,7 @@ pub trait BaseTheme {
 
 /// Los temas deben implementar este "trait".
 pub trait ThemeTrait: BaseTheme + Send + Sync {
-    fn handler(&self) -> &'static str;
+    fn handler(&self) -> Handler;
 
     fn name(&self) -> String {
         self.single_name().to_owned()
@@ -144,6 +145,6 @@ pub trait ThemeTrait: BaseTheme + Send + Sync {
 
 impl<T: ?Sized + ThemeTrait> BaseTheme for T {
     fn single_name(&self) -> &'static str {
-        util::single_type_name::<Self>()
+        single_type_name::<Self>()
     }
 }
diff --git a/pagetop/src/prelude.rs b/pagetop/src/prelude.rs
index b1c29c63..1420f1d6 100644
--- a/pagetop/src/prelude.rs
+++ b/pagetop/src/prelude.rs
@@ -1,7 +1,15 @@
 //! Re-exporta recursos comunes.
 
 // Global macros and helpers.
-pub use crate::{args, concat_string, theme_static_files, util, LazyStatic};
+pub use crate::{
+    args,
+    concat_string,
+    pub_const_handler,
+    theme_static_files,
+    LazyStatic
+};
+pub use crate::util;
+pub use crate::util::Handler;
 
 pub use crate::config::SETTINGS;
 
diff --git a/pagetop/src/response/page/hook.rs b/pagetop/src/response/page/hook.rs
index 28d6a779..09363f35 100644
--- a/pagetop/src/response/page/hook.rs
+++ b/pagetop/src/response/page/hook.rs
@@ -1,7 +1,9 @@
 use super::Page;
 use crate::core::hook::{AnyHookAction, HookActionTrait};
+use crate::pub_const_handler;
+use crate::util::Handler;
 
-pub const HOOK_BEFORE_RENDER_PAGE: &str = "pagetop::hook::before_render_page";
+pub_const_handler!(HOOK_BEFORE_RENDER_PAGE);
 
 type Hook = fn(&mut Page);
 
@@ -18,7 +20,7 @@ impl HookActionTrait for BeforeRenderPageHook {
         }
     }
 
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         HOOK_BEFORE_RENDER_PAGE
     }
 
diff --git a/pagetop/src/util.rs b/pagetop/src/util.rs
index fed318be..28a979d2 100644
--- a/pagetop/src/util.rs
+++ b/pagetop/src/util.rs
@@ -1,3 +1,66 @@
+pub type Handler = u64;
+
+// https://stackoverflow.com/a/71464396
+pub const fn handler(
+    module_path: &'static str,
+    file: &'static str,
+    line: u32,
+    column: u32,
+) -> Handler {
+    let mut hash = 0xcbf29ce484222325;
+    let prime = 0x00000100000001B3;
+
+    let mut bytes = module_path.as_bytes();
+    let mut i = 0;
+
+    while i < bytes.len() {
+        hash ^= bytes[i] as u64;
+        hash = hash.wrapping_mul(prime);
+        i += 1;
+    }
+
+    bytes = file.as_bytes();
+    i = 0;
+    while i < bytes.len() {
+        hash ^= bytes[i] as u64;
+        hash = hash.wrapping_mul(prime);
+        i += 1;
+    }
+
+    hash ^= line as u64;
+    hash = hash.wrapping_mul(prime);
+    hash ^= column as u64;
+    hash = hash.wrapping_mul(prime);
+    hash
+}
+
+#[macro_export]
+macro_rules! pub_const_handler {
+    ( $HANDLER:ident ) => {
+        pub const $HANDLER: $crate::util::Handler = $crate::util::handler(
+            module_path!(),
+            file!(),
+            line!(),
+            column!(),
+        );
+    };
+}
+
+pub fn partial_type_name(type_name: &'static str, last: usize) -> &'static str {
+    if last == 0 {
+        return type_name;
+    }
+    let positions: Vec<_> = type_name.rmatch_indices("::").collect();
+    if positions.len() < last {
+        return type_name;
+    }
+    &type_name[(positions[last - 1].0 + 2)..]
+}
+
+pub fn single_type_name<T: ?Sized>() -> &'static str {
+    partial_type_name(std::any::type_name::<T>(), 1)
+}
+
 #[macro_export]
 /// Macro para construir grupos de pares clave-valor.
 ///
@@ -34,18 +97,3 @@ macro_rules! theme_static_files {
         }
     }};
 }
-
-pub fn partial_type_name(type_name: &'static str, last: usize) -> &'static str {
-    if last == 0 {
-        return type_name;
-    }
-    let positions: Vec<_> = type_name.rmatch_indices("::").collect();
-    if positions.len() < last {
-        return type_name;
-    }
-    &type_name[(positions[last - 1].0 + 2)..]
-}
-
-pub fn single_type_name<T: ?Sized>() -> &'static str {
-    partial_type_name(std::any::type_name::<T>(), 1)
-}
diff --git a/website/src/mdbook.rs b/website/src/mdbook.rs
index 65038cac..f2589515 100644
--- a/website/src/mdbook.rs
+++ b/website/src/mdbook.rs
@@ -11,12 +11,12 @@ static MDBOOK: LazyStatic<HashMap<&'static str, Resource>> = LazyStatic::new(||
     generate()
 );
 
-pub const MODULE_MDBOOK: &str = "pagetop::website::module::mdbook";
+pub_const_handler!(MODULE_MDBOOK);
 
 pub struct MdBook;
 
 impl ModuleTrait for MdBook {
-    fn handler(&self) -> &'static str {
+    fn handler(&self) -> Handler {
         MODULE_MDBOOK
     }