Merge branch 'dgud/mnesia/ext-backend/PR-858/OTP-13058'

* dgud/mnesia/ext-backend/PR-858/OTP-13058:
  mnesia_ext: Add basic backend extension tests
  mnesia_ext: reuse snmp field for ext updates
  mnesia_ext: Create table/data containers from mnesia monitor not temporary processes
  mnesia_ext: Implement ext copies index
  mnesia_ext: Load table ext
  mnesia_ext: Dumper and schema changes
  mnesia_ext: Refactor mnesia_schema.erl
  mnesia_ext: Ext support in fragmented tables
  mnesia_ext: Backup handling
  mnesia_ext: Create schema functionality
  mnesia_ext: Add ext copies and db_fold to low level api
  mnesia_ext: Refactor record_validation code
  mnesia_ext: Add create_external and increase protocol version to monitor
  mnesia_ext: Add ext copies to records
  mnesia_ext: Add supervisor and behaviour modules

1 files changed, 59 insertions, 0 deletions

diff --git a/lib/mnesia/src/mnesia_ext_sup.erl b/lib/mnesia/src/mnesia_ext_sup.erl
new file mode 100644
index 0000000000..3e6c72161c
--- /dev/null
+++ b/lib/mnesia/src/mnesia_ext_sup.erl
@@ -0,0 +1,59 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1996-2015. 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.
+%%
+%% %CopyrightEnd%
+%%
+
+%%
+%% This module implements a supervisor for external (plug-in) processes
+
+-module(mnesia_ext_sup).
+-behaviour(supervisor).
+
+-export([start/0,
+	 init/1,
+	 start_proc/4, start_proc/5,
+	 stop_proc/1]).
+
+-define(SHUTDOWN, 120000).  % 2 minutes
+
+start() ->
+    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+
+start_proc(Name, M, F, A) ->
+    start_proc(Name, M, F, A, []).
+
+start_proc(Name, M, F, A, Opts) ->
+    [Restart, Shutdown, Type, Modules] =
+	[proplists:get_value(K, Opts, Default)
+	 || {K, Default} <- [{restart, transient},
+			     {shutdown, ?SHUTDOWN},
+			     {type, worker},
+			     {modules, [M]}]],
+    case supervisor:start_child(
+	   ?MODULE, {Name, {M,F,A}, Restart, Shutdown, Type, Modules}) of
+	{error, already_present} ->
+	    supervisor:restart_child(?MODULE, Name);
+	Other ->
+	    Other
+    end.
+
+stop_proc(Name) ->
+    supervisor:terminate_child(?MODULE, Name).
+
+init(_) ->
+    {ok, {{one_for_all, 10, 60}, []}}.