mnesia_registry

1998 2016 Ericsson AB, All Rights Reserved Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. The Initial Developer of the Original Code is Ericsson AB. mnesia_registry Dan Gudmundsson and Håkan Mattsson 98-04-24 A mnesia_registry.sgml

mnesia_registry Dump support for registries in erl_interface.

This module is usually part of the erl_interface application, but is currently part of the Mnesia application.

This module is mainly intended for internal use within OTP, but it has two functions that are exported for public use.

On C-nodes, erl_interface has support for registry tables. These tables reside in RAM on the C-node, but can also be dumped into Mnesia tables. By default, the dumping of registry tables through erl_interface causes a corresponding Mnesia table to be created with mnesia_registry:create_table/1, if necessary.

Tables that are created with these functions can be administered as all other Mnesia tables. They can be included in backups, replicas can be added, and so on. The tables are normal Mnesia tables owned by the user of the corresponding erl_interface registries.

create_table(Tab) -> ok | exit(Reason) Creates a registry table in Mnesia.

A wrapper function for mnesia:create_table/2, which creates a table (if there is no existing table) with an appropriate set of attributes. The table only resides on the local node and its storage type is the same as the schema table on the local node, that is, {ram_copies,[node()]} or {disc_copies,[node()]}.

This function is used by erl_interface to create the Mnesia table if it does not already exist.

create_table(Tab, TabDef) -> ok | exit(Reason) Creates a customized registry table in Mnesia.

A wrapper function for mnesia:create_table/2, which creates a table (if there is no existing table) with an appropriate set of attributes. The attributes and TabDef are forwarded to mnesia:create_table/2. For example, if the table is to reside as disc_only_copies on all nodes, a call looks as follows:


          TabDef = [{{disc_only_copies, node()|nodes()]}],
          mnesia_registry:create_table(my_reg, TabDef)