Release mnesia tests

1 files changed, 105 insertions, 0 deletions

diff --git a/lib/mnesia/test/mnesia_config_backup.erl b/lib/mnesia/test/mnesia_config_backup.erl
new file mode 100644
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+++ b/lib/mnesia/test/mnesia_config_backup.erl
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+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 1997-2009. All Rights Reserved.
+%% 
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%% 
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%% 
+%% %CopyrightEnd%
+%%
+
+%%
+-module(mnesia_config_backup).
+-author('[email protected]').
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%
+%% This module is used for testing the backup module config parameter.
+%%
+%% This module is an impostor for the mnesia_backup module.
+%%
+%%
+%% Original doc below:
+%%
+%% This module contains one implementation of callback functions
+%% used by Mnesia at backup and restore. The user may however
+%% write an own module the same interface as mnesia_backup and
+%% configure Mnesia so the alternate module performs the actual
+%% accesses to the backup media. This means that the user may put
+%% the backup on medias that Mnesia does not know about, possibly
+%% on hosts where Erlang is not running.
+%%
+%% The OpaqueData argument is never interpreted by other parts of
+%% Mnesia. It is the property of this module. Alternate implementations
+%% of this module may have different interpretations of OpaqueData.
+%% The OpaqueData argument given to open_write/1 and open_read/1
+%% are forwarded directly from the user.
+%%
+%% All functions must return {ok, NewOpaqueData} or {error, Reason}.
+%%
+%% The NewOpaqueData arguments returned by backup callback functions will
+%% be given as input when the next backup callback function is invoked.
+%% If any return value does not match {ok, _} the backup will be aborted.
+%%
+%% The NewOpaqueData arguments returned by restore callback functions will
+%% be given as input when the next restore callback function is invoked
+%% If any return value does not match {ok, _} the restore will be aborted.
+%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+-export([
+         open_write/1, write/2, commit_write/1, abort_write/1,
+         open_read/1, read/1, close_read/1
+        ]).
+
+-record(backup, {name, mode, items}).
+
+open_write(Name) -> 
+    file:delete(Name),
+    {ok, #backup{name = Name, mode = write, items = []}}.
+
+write(Opaque, Item) when Opaque#backup.mode == write ->
+    %% Build the list in reverse order
+    {ok, Opaque#backup{items = [Item | Opaque#backup.items]}}.
+
+commit_write(Opaque) when Opaque#backup.mode == write ->
+    Bin = term_to_binary(Opaque#backup.items),
+    case file:write_file(Opaque#backup.name, Bin) of
+	ok ->
+	    {ok, Opaque#backup{mode = closed, items = []}};
+	{error, Reason} ->
+	    {error, {commit_write, Reason}}
+    end.
+
+abort_write(Opaque) ->  
+    {ok, Opaque#backup{mode = closed, items = []}}.
+
+open_read(Name) ->
+    case file:read_file(Name) of
+	{ok, Bin} ->
+	    ReverseList = binary_to_term(Bin),
+	    List = lists:reverse(ReverseList),
+	    {ok, #backup{name = Name, mode = read, items = List}};
+	{error, Reason} ->
+	    {error, {open_read, Reason}}
+    end.
+
+read(Opaque) when Opaque#backup.mode == read ->
+    case Opaque#backup.items of
+	[Head | Tail] ->
+	    {ok, Opaque#backup{items = Tail}, Head};
+	[] ->
+	    {ok, Opaque#backup{mode = closed}, []}
+    end.
+
+close_read(Opaque) ->
+    {ok, Opaque#backup{mode = closed, items = []}}.