aboutsummaryrefslogtreecommitdiffstats
path: root/lib/gs/src/gs_frontend.erl
diff options
context:
space:
mode:
Diffstat (limited to 'lib/gs/src/gs_frontend.erl')
-rw-r--r--lib/gs/src/gs_frontend.erl371
1 files changed, 0 insertions, 371 deletions
diff --git a/lib/gs/src/gs_frontend.erl b/lib/gs/src/gs_frontend.erl
deleted file mode 100644
index f46fdb36bb..0000000000
--- a/lib/gs/src/gs_frontend.erl
+++ /dev/null
@@ -1,371 +0,0 @@
-%%
-%% %CopyrightBegin%
-%%
-%% Copyright Ericsson AB 1996-2016. 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%
-%%
-
-%%
-%% ------------------------------------------------------------
-%% Erlang Graphics Interface front-end server
-%% ------------------------------------------------------------
-%%
-
--module(gs_frontend).
--compile([{nowarn_deprecated_function,{gs,assq,2}},
- {nowarn_deprecated_function,{gs,error,2}}]).
-
--export([create/2,
- config/2,
- read/2,
- destroy/2,
- info/1,
- start/1,
- stop/0,
- init/1,
- event/3]).
-
-
--include("gstk.hrl").
-
-
-%%----------------------------------------------------------------------
-%% The ets contains: {Obj,lives}|{Obj,{Name,Pid}}
-%% new obj is {Int,Node}
-%% {{Name,Pid},Obj}
-%%----------------------------------------------------------------------
--record(state, {db,user,user_count,kernel,kernel_count,self}).
-
-%%----------------------------------------------------------------------
-%% The interface.
-%%----------------------------------------------------------------------
-create(GsPid,Args) ->
- request(GsPid,{create,Args}).
-
-config(GsPid,Args) ->
- request(GsPid,{config, Args}).
-
-read(GsPid,Args) ->
- request(GsPid,{read, Args}).
-
-destroy(GsPid,IdOrName) ->
- request(GsPid,{destroy, IdOrName}).
-
-info(Option) ->
- request(gs_frontend,{info,Option}).
-
-
-%%----------------------------------------------------------------------
-%% Comment: Frontend is only locally registered. These functions are called
-%% by any backend.
-%%----------------------------------------------------------------------
-event(FrontEnd,ToOwner,EventMsg) ->
- FrontEnd ! {event, ToOwner,EventMsg}.
-
-
-request(GsPid,Msg) ->
- GsPid ! {self(),Msg},
- receive
- {gs_reply,R} -> R
- end.
-
-%%----------------------------------------------------------------------
-%% The server
-%%----------------------------------------------------------------------
-
-start(Opts) ->
- case whereis(gs_frontend) of
- undefined ->
- P = spawn_link(gs_frontend,init,[Opts]),
- case catch register(gs_frontend, P) of
- true ->
- request(gs_frontend,{instance, backend_name(Opts), Opts});
- {'EXIT', _} ->
- exit(P,kill), % a raise... and I lost this time
- start(Opts)
- end;
- P ->
- request(P,{instance,backend_name(Opts),Opts})
- end.
-
-backend_name(Opts) ->
- case gs:assq(kernel,Opts) of
- {value,true} -> kernel;
- _ -> user
- end.
-
-
-stop() ->
- request(gs_frontend,stop).
-
-%% ------------------------------------------------------------
-%% THE FRONT END SERVER
-%% ------------------------------------------------------------
-%% Initialize
-%%
-init(_Opts) ->
- process_flag(trap_exit, true),
- DB=ets:new(gs_names,[set,public]),
- loop(#state{db=DB,self=self()}).
-
-loop(State) ->
- receive
- X ->
- % io:format("frontend received: ~p~n",[X]),
- case catch (doit(X,State)) of
- done -> loop(State);
- NewState when is_record(NewState,state) ->
- loop(NewState);
- stop -> stop;
- Reason ->
- io:format("GS frontend. Last mgs in was:~p~n",[X]),
- io:format("exit:~p~n",[X]),
- io:format("Reason: ~p~n", [Reason]),
- terminate(Reason,State),
- exit(Reason)
- end
- end.
-
-reply(To,Msg) ->
- To ! {gs_reply,Msg},
- done.
-
-doit({FromOwner,{config, Args}},State) ->
- {IdOrName, Opts} = Args,
- #state{db=DB} = State,
- case idOrName_to_id(DB,IdOrName,FromOwner) of
- undefined ->
- reply(FromOwner,{error,{no_such_object,IdOrName}});
- Obj ->
- reply(FromOwner,gstk:config(backend(State,Obj),{Obj,Opts}))
- end;
-
-doit({event,ToOwner,{gs,Obj,Etype,Data,Args}}, #state{db=DB,self=Self}) ->
- case ets:lookup(DB,Obj) of
- [{_,{Name,ToOwner}}] -> ToOwner ! {gs,Name,Etype,Data,Args};
- _ -> ToOwner ! {gs,{Obj,Self},Etype,Data,Args}
- end,
- done;
-
-doit({FromOwner,{create,Args}}, State) ->
- {Objtype, Name, Parent, Opts} = Args,
- #state{db=DB} = State,
- NameOccupied = case {Name, ets:lookup(DB,{Name,FromOwner})} of
- {undefined,_} -> false;
- {_, []} -> false;
- _ -> true
- end,
- if NameOccupied == true ->
- reply(FromOwner, {error,{name_occupied,Name}});
- true ->
- case idOrName_to_id(DB,Parent,FromOwner) of
- undefined ->
- reply(FromOwner, {error,{no_such_parent,Parent}});
- ParentObj ->
- {Id,NewState} = inc(ParentObj,State),
- case gstk:create(backend(State,ParentObj),
- {FromOwner,{Objtype,Id,ParentObj,Opts}}) of
- ok ->
- link(FromOwner),
- if Name == undefined ->
- ets:insert(DB,{Id,lives}),
- reply(FromOwner, Id),
- NewState;
- true -> % it's a real name, register it
- NamePid = {Name,FromOwner},
- ets:insert(DB,{NamePid,Id}),
- ets:insert(DB,{Id,NamePid}),
- reply(FromOwner,Id),
- NewState
- end;
- Err -> reply(FromOwner,Err)
- end
- end
- end;
-
-doit({FromOwner,{read, Args}}, State) ->
- #state{db=DB} = State,
- {IdOrName, Opt} = Args,
- case idOrName_to_id(DB,IdOrName,FromOwner) of
- undefined ->
- reply(FromOwner,{error,{no_such_object,IdOrName}});
- Obj ->
- reply(FromOwner,gstk:read(backend(State,Obj),{Obj,Opt}))
- end;
-
-doit({'EXIT', UserBackend, Reason}, State)
- when State#state.user == UserBackend ->
- gs:error("user backend died reason ~w~n", [Reason]),
- remove_user_objects(State#state.db),
- State#state{user=undefined};
-
-doit({'EXIT', KernelBackend, Reason}, State)
- when State#state.kernel == KernelBackend ->
- gs:error("kernel backend died reason ~w~n", [Reason]),
- exit({gs_kernel_died,Reason});
-
-doit({'EXIT', Pid, _Reason}, #state{kernel=K,user=U,db=DB}) ->
- %% io:format("Pid ~w died reason ~w~n", [Pid, _Reason]),
- if is_pid(U) ->
- DeadObjU = gstk:pid_died(U,Pid),
- remove_objs(DB,DeadObjU);
- true -> ok
- end,
- if is_pid(K) ->
- DeadObjK = gstk:pid_died(K,Pid),
- remove_objs(DB,DeadObjK);
- true -> true end,
- done;
-
-doit({FromOwner,{destroy, IdOrName}}, State) ->
- #state{db=DB} = State,
- case idOrName_to_id(DB,IdOrName,FromOwner) of
- undefined ->
- reply(FromOwner, {error,{no_such_object,IdOrName}});
- Obj ->
- DeadObj = gstk:destroy(backend(State,Obj),Obj),
- remove_objs(DB,DeadObj),
- reply(FromOwner,done)
- end;
-
-doit({From,{instance,user,Opts}},State) ->
- #state{db=DB, self=Self, user_count=UC} = State,
- case ets:lookup(DB,1) of
- [_] -> reply(From, {1,Self});
- [] ->
- ets:insert(DB,{1,lives}), % parent of all user gs objs
- case gstk:start_link(1, Self, Self, Opts) of
- {ok, UserBackend} ->
- reply(From, {1, Self}),
- case UC of
- undefined ->
- State#state{user_count=1, user=UserBackend};
- _N ->
- State#state{user_count=UC+2, user=UserBackend}
- end;
- {error, Reason} ->
- reply(From, {error, Reason}),
- stop
- end
- end;
-
-doit({From,{instance,kernel,Opts}},State) ->
- #state{db=DB,self=Self} = State,
- case ets:lookup(DB,0) of
- [_] -> reply(From, {0,Self});
- [] ->
- ets:insert(DB,{0,lives}), % parent of all user gs objs
- case gstk:start_link(0,Self,Self,Opts) of
- {ok, KernelBackend} ->
- reply(From, {0,Self}),
- State#state{kernel_count=0,kernel=KernelBackend};
- {error, Reason} ->
- reply(From, {error,Reason}),
- stop
- end
- end;
-
-
-doit({From,stop}, State) ->
- #state{kernel=K,user=U} = State,
- if is_pid(U) -> gstk:stop(U);
- true -> true end,
- if is_pid(K) -> gstk:stop(K);
- true -> true end,
- reply(From,stopped),
- stop;
-
-doit({From,{gstk,user,Msg}},State) ->
- reply(From,gstk:request(State#state.user,Msg));
-doit({From,{gstk,kernel,Msg}},State) ->
- reply(From,gstk:request(State#state.kernel,Msg));
-
-doit({From,{info,gs_db}},State) ->
- io:format("gs_db:~p~n",[ets:tab2list(State#state.db)]),
- reply(From,State);
-doit({From,{info,kernel_db}},State) ->
- reply(From,gstk:request(State#state.kernel,dump_db));
-doit({From,{info,user_db}},State) ->
- reply(From,gstk:request(State#state.user,dump_db));
-doit({From,{info,Unknown}},_State) ->
- io:format("gs: unknown info option '~w', use one of 'gs_db', 'kernel_db' or 'user_db'~n",[Unknown]),
- reply(From,ok).
-
-terminate(_Reason,#state{db=DB}) ->
- if DB==undefined -> ok;
- true ->
- % io:format("frontend db:~p~n",[ets:tab2list(DB)])
- ok
- end.
-
-
-backend(#state{user=Upid,kernel=Kpid},Obj) ->
- if Obj rem 2 == 0 -> Kpid;
- true -> Upid
- end.
-
-%%----------------------------------------------------------------------
-%% Returns: {NewId,NewState}
-%%----------------------------------------------------------------------
-inc(ParInt,State) when ParInt rem 2 == 1 ->
- X=State#state.user_count+2,
- {X,State#state{user_count=X}};
-inc(ParInt,State) when ParInt rem 2 == 0 ->
- X=State#state.kernel_count+2,
- {X,State#state{kernel_count=X}}.
-
-remove_user_objects(DB) ->
- DeadObj = find_user_obj(ets:first(DB),DB),
- remove_objs(DB,DeadObj).
-
-find_user_obj(Int,DB) when is_integer(Int) ->
- if Int rem 2 == 0 -> %% a kernel obj
- find_user_obj(ets:next(DB,Int),DB);
- true -> %% a user obj
- [Int|find_user_obj(ets:next(DB,Int),DB)]
- end;
-find_user_obj('$end_of_table',_DB) ->
- [];
-find_user_obj(OtherKey,DB) ->
- find_user_obj(ets:next(DB,OtherKey),DB).
-
-remove_objs(DB,[Obj|Objs]) ->
- case ets:lookup(DB, Obj) of
- [{_,NamePid}] ->
- ets:delete(DB,Obj),
- ets:delete(DB,NamePid);
- [] -> backend_only
- end,
- remove_objs(DB,Objs);
-remove_objs(_DB,[]) -> done.
-
-idOrName_to_id(DB,IdOrName,Pid) when is_atom(IdOrName) ->
- case ets:lookup(DB,{IdOrName,Pid}) of
- [{_,Obj}] -> Obj;
- _ -> undefined
- end;
-idOrName_to_id(DB,Obj,_Pid) ->
- case ets:lookup(DB,Obj) of
- [_] -> Obj;
- _ -> undefined
- end.
-
-
-
-
-%% ----------------------------------------
-%% done
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-09 03:11:27 +0000