diff --git a/include/proto/hlua_fcn.h b/include/proto/hlua_fcn.h
index 560d1f4..9c5d908 100644
--- a/include/proto/hlua_fcn.h
+++ b/include/proto/hlua_fcn.h
@@ -5,6 +5,7 @@
 void hlua_class_const_str(lua_State *L, const char *name, const char *value);
 void hlua_class_function(lua_State *L, const char *name, int (*function)(lua_State *L));
 void *hlua_checkudata(lua_State *L, int ud, int class_ref);
+int hlua_register_metatable(struct lua_State *L, char *name);
 int hlua_fcn_reg_core_fcn(lua_State *L);
 int hlua_dump_object(lua_State *L);
 
diff --git a/src/hlua.c b/src/hlua.c
index 402595a..1fd3b27 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -6592,12 +6592,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_MAP);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fille the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6608,11 +6602,12 @@
 
 	lua_rawset(gL.T, -3);
 
-	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
+	/* Register previous table in the registry with reference and named entry.
+	 * The function hlua_register_metatable() pops the stack, so we
+	 * previously create a copy of the table.
+	 */
 	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_MAP); /* register class session. */
-	class_map_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */
+	class_map_ref = hlua_register_metatable(gL.T, CLASS_MAP);
 
 	/* Assign the metatable to the mai Map object. */
 	lua_setmetatable(gL.T, -2);
@@ -6629,12 +6624,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_CHANNEL);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fille the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6653,9 +6642,7 @@
 	lua_rawset(gL.T, -3);
 
 	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_CHANNEL); /* register class session. */
-	class_channel_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */
+	class_channel_ref = hlua_register_metatable(gL.T, CLASS_CHANNEL);
 
 	/*
 	 *
@@ -6666,12 +6653,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_FETCHES);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fille the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6709,9 +6690,7 @@
 	lua_rawset(gL.T, -3);
 
 	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_FETCHES); /* register class session. */
-	class_fetches_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */
+	class_fetches_ref = hlua_register_metatable(gL.T, CLASS_FETCHES);
 
 	/*
 	 *
@@ -6722,12 +6701,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_CONVERTERS);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fill the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6762,9 +6735,7 @@
 	lua_rawset(gL.T, -3);
 
 	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_CONVERTERS); /* register class session. */
-	class_converters_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */
+	class_converters_ref = hlua_register_metatable(gL.T, CLASS_CONVERTERS);
 
 	/*
 	 *
@@ -6775,12 +6746,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_HTTP);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fille the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6808,9 +6773,7 @@
 	lua_rawset(gL.T, -3);
 
 	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_HTTP); /* register class session. */
-	class_http_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */
+	class_http_ref = hlua_register_metatable(gL.T, CLASS_HTTP);
 
 	/*
 	 *
@@ -6821,12 +6784,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_APPLET_TCP);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fille the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6841,9 +6798,7 @@
 	lua_settable(gL.T, -3);
 
 	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_APPLET_TCP); /* register class session. */
-	class_applet_tcp_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */
+	class_applet_tcp_ref = hlua_register_metatable(gL.T, CLASS_APPLET_TCP);
 
 	/*
 	 *
@@ -6854,12 +6809,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_APPLET_HTTP);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fille the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6877,9 +6826,7 @@
 	lua_settable(gL.T, -3);
 
 	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_APPLET_HTTP); /* register class session. */
-	class_applet_http_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */
+	class_applet_http_ref = hlua_register_metatable(gL.T, CLASS_APPLET_HTTP);
 
 	/*
 	 *
@@ -6890,12 +6837,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_TXN);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fille the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6919,9 +6860,7 @@
 	lua_rawset(gL.T, -3);
 
 	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_TXN); /* register class session. */
-	class_txn_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class session. */
+	class_txn_ref = hlua_register_metatable(gL.T, CLASS_TXN);
 
 	/*
 	 *
@@ -6932,12 +6871,6 @@
 	/* Create and fill the metatable. */
 	lua_newtable(gL.T);
 
-	/* Create the __tostring identifier */
-	lua_pushstring(gL.T, "__tostring");
-	lua_pushstring(gL.T, CLASS_SOCKET);
-	lua_pushcclosure(gL.T, hlua_dump_object, 1);
-	lua_rawset(gL.T, -3);
-
 	/* Create and fille the __index entry. */
 	lua_pushstring(gL.T, "__index");
 	lua_newtable(gL.T);
@@ -6962,9 +6895,7 @@
 	lua_rawset(gL.T, -3); /* Push the last 2 entries in the table at index -3 */
 
 	/* Register previous table in the registry with reference and named entry. */
-	lua_pushvalue(gL.T, -1); /* Copy the -1 entry and push it on the stack. */
-	lua_setfield(gL.T, LUA_REGISTRYINDEX, CLASS_SOCKET); /* register class socket. */
-	class_socket_ref = luaL_ref(gL.T, LUA_REGISTRYINDEX); /* reference class socket. */
+	class_socket_ref = hlua_register_metatable(gL.T, CLASS_SOCKET);
 
 	/* Proxy and server configuration initialisation. */
 	memset(&socket_proxy, 0, sizeof(socket_proxy));
diff --git a/src/hlua_fcn.c b/src/hlua_fcn.c
index ac8f033..1dcd650 100644
--- a/src/hlua_fcn.c
+++ b/src/hlua_fcn.c
@@ -60,6 +60,41 @@
 	return 1;
 }
 
+/* This function register a table as metatable and. It names
+ * the metatable, and returns the associated reference.
+ * The original table is poped from the top of the stack.
+ * "name" is the referenced class name.
+ */
+int hlua_register_metatable(struct lua_State *L, char *name)
+{
+	/* Check the type of the top element. it must be
+	 * a table.
+	 */
+	if (lua_type(L, -1) != LUA_TTABLE)
+		luaL_error(L, "hlua_register_metatable() requires a type Table "
+		              "in the top of the stack");
+
+	/* Add the __tostring function which identify the
+	 * created object.
+	 */
+	lua_pushstring(L, "__tostring");
+	lua_pushstring(L, name);
+	lua_pushcclosure(L, hlua_dump_object, 1);
+	lua_rawset(L, -3);
+
+	/* Register a named entry for the table. The table
+	 * reference is copyed first because the function
+	 * lua_setfield() pop the entry.
+	 */
+	lua_pushvalue(L, -1);
+	lua_setfield(L, LUA_REGISTRYINDEX, name);
+
+	/* Creates the reference of the object. The
+	 * function luaL_ref pop the top of the stack.
+	 */
+	return luaL_ref(L, LUA_REGISTRYINDEX);
+}
+
 /* Return an object of the expected type, or throws an error. */
 void *hlua_checkudata(lua_State *L, int ud, int class_ref)
 {