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-rw-r--r--lib/asn1/src/asn1_db.erl263
1 files changed, 125 insertions, 138 deletions
diff --git a/lib/asn1/src/asn1_db.erl b/lib/asn1/src/asn1_db.erl
index f680b3d064..843fc66c9c 100644
--- a/lib/asn1/src/asn1_db.erl
+++ b/lib/asn1/src/asn1_db.erl
@@ -1,167 +1,154 @@
%%
%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 1997-2009. All Rights Reserved.
-%%
+%%
+%% Copyright Ericsson AB 1997-2012. 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(asn1_db).
-%-compile(export_all).
--export([dbnew/1,dbsave/2,dbload/1,dbput/3,dbget/2,dbget_all/1]).
--export([dbget_all_mod/1,dbstop/0,dbclear/0,dberase_module/1,dbstart/1,stop_server/1]).
-%% internal exports
--export([dbloop0/1,dbloop/2]).
-%% Db stuff
-dbstart(Includes) ->
- start_server(asn1db, asn1_db, dbloop0, [Includes]).
+-export([dbstart/1,dbnew/1,dbsave/2,dbload/1,dbput/3,dbget/2,dbget_all/1]).
+-export([dbget_all_mod/1,dbclear/0,dberase_module/1,dbstop/0]).
-dbloop0(Includes) ->
- dbloop(Includes, ets:new(asn1, [set,named_table])).
-
-opentab(Tab,Mod,[]) ->
- opentab(Tab,Mod,["."]);
-opentab(Tab,Mod,Includes) ->
- Base = lists:concat([Mod,".asn1db"]),
- opentab2(Tab,Base,Mod,Includes,ok).
+-record(state, {parent, monitor, includes, table}).
-opentab2(_Tab,_Base,_Mod,[],Error) ->
- Error;
-opentab2(Tab,Base,Mod,[Ih|It],_Error) ->
- File = filename:join(Ih,Base),
- case ets:file2tab(File) of
- {ok,Modtab} ->
- ets:insert(Tab,{Mod, Modtab}),
- {ok,Modtab};
- NewErr ->
- opentab2(Tab,Base,Mod,It,NewErr)
+%% Interface
+dbstart(Includes) ->
+ Parent = self(),
+ case get(?MODULE) of
+ undefined ->
+ put(?MODULE, spawn_link(fun() -> init(Parent, Includes) end)),
+ true;
+ _Pid ->
+ req({new_includes, Includes})
end.
-
-dbloop(Includes, Tab) ->
- receive
- {From,{set, Mod, K2, V}} ->
- [{_,Modtab}] = ets:lookup(Tab,Mod),
- ets:insert(Modtab,{K2, V}),
- From ! {asn1db, ok},
- dbloop(Includes, Tab);
- {From, {get, Mod, K2}} ->
- Result = case ets:lookup(Tab,Mod) of
- [] ->
- opentab(Tab,Mod,Includes);
- [{_,Modtab}] -> {ok,Modtab}
- end,
- case Result of
- {ok,Newtab} ->
- From ! {asn1db, lookup(Newtab, K2)};
- _Error ->
- From ! {asn1db, undefined}
- end,
- dbloop(Includes, Tab);
- {From, {all_mod, Mod}} ->
- [{_,Modtab}] = ets:lookup(Tab,Mod),
- From ! {asn1db, ets:tab2list(Modtab)},
- dbloop(Includes, Tab);
- {From, {delete_mod, Mod}} ->
- [{_,Modtab}] = ets:lookup(Tab,Mod),
- ets:delete(Modtab),
- ets:delete(Tab,Mod),
- From ! {asn1db, ok},
- dbloop(Includes, Tab);
- {From, {save, OutFile,Mod}} ->
- [{_,Mtab}] = ets:lookup(Tab,Mod),
- From ! {asn1db, ets:tab2file(Mtab,OutFile)},
- dbloop(Includes,Tab);
- {From, {load, Mod}} ->
- Result = case ets:lookup(Tab,Mod) of
- [] ->
- opentab(Tab,Mod,Includes);
- [{_,Modtab}] -> {ok,Modtab}
- end,
- From ! {asn1db,Result},
- dbloop(Includes,Tab);
- {From, {new, Mod}} ->
- case ets:lookup(Tab,Mod) of
- [{_,Modtab}] ->
- ets:delete(Modtab);
- _ ->
- true
- end,
- Tabname = list_to_atom(lists:concat(["asn1_",Mod])),
- ets:new(Tabname, [set,named_table]),
- ets:insert(Tab,{Mod,Tabname}),
- From ! {asn1db, ok},
- dbloop(Includes,Tab);
- {From, stop} ->
- From ! {asn1db, ok}; %% nothing to store
- {From, clear} ->
- ModTabList = [Mt||{_,Mt} <- ets:tab2list(Tab)],
- lists:foreach(fun(T) -> ets:delete(T) end,ModTabList),
- ets:delete(Tab),
- From ! {asn1db, cleared},
- dbloop(Includes, ets:new(asn1, [set]));
- {From,{new_includes,[NewIncludes]}} ->
- From ! {asn1db,done},
- dbloop(NewIncludes,Tab)
+dbnew(Module) -> req({new, Module}).
+dbsave(OutFile, Module) -> req({save, OutFile, Module}).
+dbload(Module) -> req({load, Module}).
+dbput(Module, K, V) -> req({set, Module, K, V}).
+dbget(Module, K) -> req({get, Module, K}).
+dbget_all(K) -> req({get_all, K}).
+dbget_all_mod(Mod) -> req({all_mod, Mod}).
+dbclear() -> req(clear).
+dberase_module({module,M}) -> req({delete_mod, M}).
+dbstop() -> Resp = req(stop), erase(?MODULE), Resp.
+
+%% Internal functions
+req(Request) ->
+ DbPid = get(?MODULE),
+ Ref = erlang:monitor(process,DbPid),
+ get(?MODULE) ! {{Ref, self()}, Request},
+ receive
+ {{Ref,?MODULE}, Reply} ->
+ erlang:demonitor(Ref,[flush]),
+ Reply;
+ {'DOWN',Ref,_,_,Info} ->
+ exit({db_error,Info})
end.
+reply({Ref,From}, Response) ->
+ From ! {{Ref,?MODULE}, Response}.
-%%all(Tab, K) ->
-%% pickup(K, ets:match(Tab, {{K, '$1'}, '$2'})).
-%%pickup(K, []) -> [];
-%%pickup(K, [[V1,V2] |T]) ->
-%% [{{K,V1},V2} | pickup(K, T)].
+init(Parent, Includes) ->
+ MRef = erlang:monitor(process, Parent),
+ loop(#state{parent = Parent, monitor = MRef, includes = Includes,
+ table = ets:new(?MODULE, [])}).
-lookup(Tab, K) ->
- case ets:lookup(Tab, K) of
- [] -> undefined;
- [{K,V}] -> V
+loop(#state{parent = Parent, monitor = MRef, table = Table,
+ includes = Includes} = State) ->
+ receive
+ {From, {set, Mod, K2, V}} ->
+ [{_, Modtab}] = ets:lookup(Table, Mod),
+ ets:insert(Modtab, {K2, V}),
+ reply(From, ok),
+ loop(State);
+ {From, {get, Mod, K2}} ->
+ Result = case ets:lookup(Table, Mod) of
+ [] -> opentab(Table, Mod, Includes);
+ [{_, Modtab}] -> {ok, Modtab}
+ end,
+ case Result of
+ {ok, Newtab} -> reply(From, lookup(Newtab, K2));
+ _Error -> reply(From, undefined)
+ end,
+ loop(State);
+ {From, {all_mod, Mod}} ->
+ [{_, Modtab}] = ets:lookup(Table, Mod),
+ reply(From, ets:tab2list(Modtab)),
+ loop(State);
+ {From, {delete_mod, Mod}} ->
+ [{_, Modtab}] = ets:lookup(Table, Mod),
+ ets:delete(Modtab),
+ ets:delete(Table, Mod),
+ reply(From, ok),
+ loop(State);
+ {From, {save, OutFile, Mod}} ->
+ [{_,Mtab}] = ets:lookup(Table, Mod),
+ reply(From, ets:tab2file(Mtab, OutFile)),
+ loop(State);
+ {From, {load, Mod}} ->
+ Result = case ets:lookup(Table, Mod) of
+ [] -> opentab(Table, Mod, Includes);
+ [{_, Modtab}] -> {ok, Modtab}
+ end,
+ reply(From, Result),
+ loop(State);
+ {From, {new, Mod}} ->
+ case ets:lookup(Table, Mod) of
+ [{_, Modtab}] -> ets:delete(Modtab);
+ _ -> true
+ end,
+ ModTableId = ets:new(list_to_atom(lists:concat(["asn1_",Mod])), []),
+ ets:insert(Table, {Mod, ModTableId}),
+ reply(From, ok),
+ loop(State);
+ {From, clear} ->
+ [ets:delete(Mt) || {_, Mt} <- ets:tab2list(Table)],
+ ets:delete(Table),
+ reply(From, cleared),
+ loop(State#state{table = ets:new(asn1, [set])});
+ {From, {new_includes, NewIncludes}} ->
+ reply(From, true),
+ loop(State#state{includes = NewIncludes});
+ {From, stop} ->
+ reply(From, stopped); %% Nothing to store
+ {'DOWN', MRef, process, Parent, Reason} ->
+ exit(Reason)
end.
+opentab(Tab, Mod, []) ->
+ opentab(Tab, Mod, ["."]);
+opentab(Tab, Mod, Includes) ->
+ Base = lists:concat([Mod, ".asn1db"]),
+ opentab2(Tab, Base, Mod, Includes, ok).
-dbnew(Module) -> req({new,Module}).
-dbsave(OutFile,Module) -> req({save,OutFile,Module}).
-dbload(Module) -> req({load,Module}).
-
-dbput(Module,K,V) -> req({set, Module, K, V}).
-dbget(Module,K) -> req({get, Module, K}).
-dbget_all(K) -> req({get_all, K}).
-dbget_all_mod(Mod) -> req({all_mod,Mod}).
-dbstop() -> stop_server(asn1db).
-dbclear() -> req(clear).
-dberase_module({module,M})->
- req({delete_mod, M}).
-
-req(R) ->
- asn1db ! {self(), R},
- receive {asn1db, Reply} -> Reply end.
-
-stop_server(Name) ->
- stop_server(Name, whereis(Name)).
-stop_server(_, undefined) -> stopped;
-stop_server(Name, _Pid) ->
- Name ! {self(), stop},
- receive {Name, _} -> stopped end.
-
-
-start_server(Name,Mod,Fun,Args) ->
- case whereis(Name) of
- undefined ->
- register(Name, spawn(Mod,Fun, Args));
- _Pid ->
- req({new_includes,Args})
+opentab2(_Tab, _Base, _Mod, [], Error) ->
+ Error;
+opentab2(Tab, Base, Mod, [Ih|It], _Error) ->
+ File = filename:join(Ih, Base),
+ case ets:file2tab(File) of
+ {ok, Modtab} ->
+ ets:insert(Tab, {Mod, Modtab}),
+ {ok, Modtab};
+ NewErr ->
+ opentab2(Tab, Base, Mod, It, NewErr)
end.
-
+lookup(Tab, K) ->
+ case ets:lookup(Tab, K) of
+ [] -> undefined;
+ [{K,V}] -> V
+ end.
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