%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2014. 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%
%%
%%
%% This module exports the public interface of the Mnesia DBMS engine
-module(mnesia).
%-behaviour(mnesia_access).
-export([
%% Start, stop and debugging
start/0, start/1, stop/0, % Not for public use
set_debug_level/1, lkill/0, kill/0, % Not for public use
ms/0,
change_config/2,
%% Activity mgt
abort/1, transaction/1, transaction/2, transaction/3,
sync_transaction/1, sync_transaction/2, sync_transaction/3,
async_dirty/1, async_dirty/2, sync_dirty/1, sync_dirty/2, ets/1, ets/2,
activity/2, activity/3, activity/4, % Not for public use
is_transaction/0,
%% Access within an activity - Lock acquisition
lock/2, lock/4,
lock_table/2,
read_lock_table/1,
write_lock_table/1,
%% Access within an activity - Updates
write/1, s_write/1, write/3, write/5,
delete/1, s_delete/1, delete/3, delete/5,
delete_object/1, s_delete_object/1, delete_object/3, delete_object/5,
%% Access within an activity - Reads
read/1, read/2, wread/1, read/3, read/5,
match_object/1, match_object/3, match_object/5,
select/1,select/2,select/3,select/4,select/5,select/6,
all_keys/1, all_keys/4,
index_match_object/2, index_match_object/4, index_match_object/6,
index_read/3, index_read/6,
first/1, next/2, last/1, prev/2,
first/3, next/4, last/3, prev/4,
%% Iterators within an activity
foldl/3, foldl/4, foldr/3, foldr/4,
%% Dirty access regardless of activities - Updates
dirty_write/1, dirty_write/2,
dirty_delete/1, dirty_delete/2,
dirty_delete_object/1, dirty_delete_object/2,
dirty_update_counter/2, dirty_update_counter/3,
%% Dirty access regardless of activities - Read
dirty_read/1, dirty_read/2,
dirty_select/2,
dirty_match_object/1, dirty_match_object/2, dirty_all_keys/1,
dirty_index_match_object/2, dirty_index_match_object/3,
dirty_index_read/3, dirty_slot/2,
dirty_first/1, dirty_next/2, dirty_last/1, dirty_prev/2,
%% Info
table_info/2, table_info/4, schema/0, schema/1,
error_description/1, info/0, system_info/1,
system_info/0, % Not for public use
%% Database mgt
create_schema/1, delete_schema/1,
backup/1, backup/2, traverse_backup/4, traverse_backup/6,
install_fallback/1, install_fallback/2,
uninstall_fallback/0, uninstall_fallback/1,
activate_checkpoint/1, deactivate_checkpoint/1,
backup_checkpoint/2, backup_checkpoint/3, restore/2,
%% Table mgt
create_table/1, create_table/2, delete_table/1,
add_table_copy/3, del_table_copy/2, move_table_copy/3,
add_table_index/2, del_table_index/2,
transform_table/3, transform_table/4,
change_table_copy_type/3, change_table_majority/2,
read_table_property/2, write_table_property/2, delete_table_property/2,
change_table_frag/2,
clear_table/1, clear_table/4,
%% Table load
dump_tables/1, wait_for_tables/2, force_load_table/1,
change_table_access_mode/2, change_table_load_order/2,
set_master_nodes/1, set_master_nodes/2,
%% Misc admin
dump_log/0, sync_log/0,
subscribe/1, unsubscribe/1, report_event/1,
%% Snmp
snmp_open_table/2, snmp_close_table/1,
snmp_get_row/2, snmp_get_next_index/2, snmp_get_mnesia_key/2,
%% Textfile access
load_textfile/1, dump_to_textfile/1,
%% QLC functions
table/1, table/2,
%% Mnemosyne exclusive
get_activity_id/0, put_activity_id/1, % Not for public use
%% Mnesia internal functions
dirty_rpc/4, % Not for public use
has_var/1, fun_select/7, fun_select/10, select_cont/3, dirty_sel_init/5,
foldl/6, foldr/6,
%% Module internal callback functions
raw_table_info/2, % Not for public use
remote_dirty_match_object/2, % Not for public use
remote_dirty_select/2 % Not for public use
]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-include("mnesia.hrl").
-import(mnesia_lib, [verbose/2]).
-define(DEFAULT_ACCESS, ?MODULE).
%% Select
-define(PATTERN_TO_OBJECT_MATCH_SPEC(Pat), [{Pat,[],['$_']}]).
-define(PATTERN_TO_BINDINGS_MATCH_SPEC(Pat), [{Pat,[],['$$']}]).
%% Local function in order to avoid external function call
val(Var) ->
case ?catch_val(Var) of
{'EXIT', Reason} -> mnesia_lib:other_val(Var, Reason);
Value -> Value
end.
is_dollar_digits(Var) ->
case atom_to_list(Var) of
[$$ | Digs] ->
is_digits(Digs);
_ ->
false
end.
is_digits([Dig | Tail]) ->
if
$0 =< Dig, Dig =< $9 ->
is_digits(Tail);
true ->
false
end;
is_digits([]) ->
true.
has_var(X) when is_atom(X) ->
if
X == '_' ->
true;
is_atom(X) ->
is_dollar_digits(X);
true ->
false
end;
has_var(X) when is_tuple(X) ->
e_has_var(X, tuple_size(X));
has_var([H|T]) ->
case has_var(H) of
false -> has_var(T);
Other -> Other
end;
has_var(_) -> false.
e_has_var(_, 0) -> false;
e_has_var(X, Pos) ->
case has_var(element(Pos, X))of
false -> e_has_var(X, Pos-1);
Other -> Other
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Start and stop
start() ->
{Time , Res} = timer:tc(application, start, [?APPLICATION, temporary]),
Secs = Time div 1000000,
case Res of
ok ->
verbose("Mnesia started, ~p seconds~n",[ Secs]),
ok;
{error, {already_started, mnesia}} ->
verbose("Mnesia already started, ~p seconds~n",[ Secs]),
ok;
{error, R} ->
verbose("Mnesia failed to start, ~p seconds: ~p~n",[ Secs, R]),
{error, R}
end.
start(ExtraEnv) when is_list(ExtraEnv) ->
case mnesia_lib:ensure_loaded(?APPLICATION) of
ok ->
patched_start(ExtraEnv);
Error ->
Error
end;
start(ExtraEnv) ->
{error, {badarg, ExtraEnv}}.
patched_start([{Env, Val} | Tail]) when is_atom(Env) ->
case mnesia_monitor:patch_env(Env, Val) of
{error, Reason} ->
{error, Reason};
_NewVal ->
patched_start(Tail)
end;
patched_start([Head | _]) ->
{error, {bad_type, Head}};
patched_start([]) ->
start().
stop() ->
case application:stop(?APPLICATION) of
ok -> stopped;
{error, {not_started, ?APPLICATION}} -> stopped;
Other -> Other
end.
change_config(extra_db_nodes, Ns) when is_list(Ns) ->
mnesia_controller:connect_nodes(Ns);
change_config(dc_dump_limit, N) when is_number(N), N > 0 ->
case mnesia_lib:is_running() of
yes ->
mnesia_lib:set(dc_dump_limit, N),
{ok, N};
_ ->
{error, {not_started, ?APPLICATION}}
end;
change_config(BadKey, _BadVal) ->
{error, {badarg, BadKey}}.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Debugging
set_debug_level(Level) ->
mnesia_subscr:set_debug_level(Level).
lkill() ->
mnesia_sup:kill().
kill() ->
rpc:multicall(mnesia_sup, kill, []).
ms() ->
[
mnesia,
mnesia_backup,
mnesia_bup,
mnesia_checkpoint,
mnesia_checkpoint_sup,
mnesia_controller,
mnesia_dumper,
mnesia_loader,
mnesia_frag,
mnesia_frag_hash,
mnesia_frag_old_hash,
mnesia_index,
mnesia_kernel_sup,
mnesia_late_loader,
mnesia_lib,
mnesia_log,
mnesia_registry,
mnesia_schema,
mnesia_snmp_hook,
mnesia_snmp_sup,
mnesia_subscr,
mnesia_sup,
mnesia_text,
mnesia_tm,
mnesia_recover,
mnesia_locker,
%% Keep these last in the list, so
%% mnesia_sup kills these last
mnesia_monitor,
mnesia_event
].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Activity mgt
-spec abort(_) -> no_return().
abort(Reason) ->
exit({aborted, Reason}).
is_transaction() ->
case get(mnesia_activity_state) of
{_, Tid, _Ts} when element(1,Tid) == tid ->
true;
_ ->
false
end.
transaction(Fun) ->
transaction(get(mnesia_activity_state), Fun, [], infinity, ?DEFAULT_ACCESS, async).
transaction(Fun, Retries) when is_integer(Retries), Retries >= 0 ->
transaction(get(mnesia_activity_state), Fun, [], Retries, ?DEFAULT_ACCESS, async);
transaction(Fun, Retries) when Retries == infinity ->
transaction(get(mnesia_activity_state), Fun, [], Retries, ?DEFAULT_ACCESS, async);
transaction(Fun, Args) ->
transaction(get(mnesia_activity_state), Fun, Args, infinity, ?DEFAULT_ACCESS, async).
transaction(Fun, Args, Retries) ->
transaction(get(mnesia_activity_state), Fun, Args, Retries, ?DEFAULT_ACCESS, async).
sync_transaction(Fun) ->
transaction(get(mnesia_activity_state), Fun, [], infinity, ?DEFAULT_ACCESS, sync).
sync_transaction(Fun, Retries) when is_integer(Retries), Retries >= 0 ->
transaction(get(mnesia_activity_state), Fun, [], Retries, ?DEFAULT_ACCESS, sync);
sync_transaction(Fun, Retries) when Retries == infinity ->
transaction(get(mnesia_activity_state), Fun, [], Retries, ?DEFAULT_ACCESS, sync);
sync_transaction(Fun, Args) ->
transaction(get(mnesia_activity_state), Fun, Args, infinity, ?DEFAULT_ACCESS, sync).
sync_transaction(Fun, Args, Retries) ->
transaction(get(mnesia_activity_state), Fun, Args, Retries, ?DEFAULT_ACCESS, sync).
transaction(State, Fun, Args, Retries, Mod, Kind)
when is_function(Fun), is_list(Args), Retries == infinity, is_atom(Mod) ->
mnesia_tm:transaction(State, Fun, Args, Retries, Mod, Kind);
transaction(State, Fun, Args, Retries, Mod, Kind)
when is_function(Fun), is_list(Args), is_integer(Retries), Retries >= 0, is_atom(Mod) ->
mnesia_tm:transaction(State, Fun, Args, Retries, Mod, Kind);
transaction(_State, Fun, Args, Retries, Mod, _Kind) ->
{aborted, {badarg, Fun, Args, Retries, Mod}}.
non_transaction(State, Fun, Args, ActivityKind, Mod)
when is_function(Fun), is_list(Args), is_atom(Mod) ->
mnesia_tm:non_transaction(State, Fun, Args, ActivityKind, Mod);
non_transaction(_State, Fun, Args, _ActivityKind, _Mod) ->
{aborted, {badarg, Fun, Args}}.
async_dirty(Fun) ->
async_dirty(Fun, []).
async_dirty(Fun, Args) ->
non_transaction(get(mnesia_activity_state), Fun, Args, async_dirty, ?DEFAULT_ACCESS).
sync_dirty(Fun) ->
sync_dirty(Fun, []).
sync_dirty(Fun, Args) ->
non_transaction(get(mnesia_activity_state), Fun, Args, sync_dirty, ?DEFAULT_ACCESS).
ets(Fun) ->
ets(Fun, []).
ets(Fun, Args) ->
non_transaction(get(mnesia_activity_state), Fun, Args, ets, ?DEFAULT_ACCESS).
activity(Kind, Fun) ->
activity(Kind, Fun, []).
activity(Kind, Fun, Args) when is_list(Args) ->
activity(Kind, Fun, Args, mnesia_monitor:get_env(access_module));
activity(Kind, Fun, Mod) ->
activity(Kind, Fun, [], Mod).
activity(Kind, Fun, Args, Mod) ->
State = get(mnesia_activity_state),
case Kind of
ets -> non_transaction(State, Fun, Args, Kind, Mod);
async_dirty -> non_transaction(State, Fun, Args, Kind, Mod);
sync_dirty -> non_transaction(State, Fun, Args, Kind, Mod);
transaction -> wrap_trans(State, Fun, Args, infinity, Mod, async);
{transaction, Retries} -> wrap_trans(State, Fun, Args, Retries, Mod, async);
sync_transaction -> wrap_trans(State, Fun, Args, infinity, Mod, sync);
{sync_transaction, Retries} -> wrap_trans(State, Fun, Args, Retries, Mod, sync);
_ -> {aborted, {bad_type, Kind}}
end.
wrap_trans(State, Fun, Args, Retries, Mod, Kind) ->
case transaction(State, Fun, Args, Retries, Mod, Kind) of
{atomic, GoodRes} -> GoodRes;
BadRes -> exit(BadRes)
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Access within an activity - lock acquisition
%% Grab a lock on an item in the global lock table
%% Item may be any term. Lock may be write or read.
%% write lock is set on all the given nodes
%% read lock is only set on the first node
%% Nodes may either be a list of nodes or one node as an atom
%% Mnesia on all Nodes must be connected to each other, but
%% it is not neccessary that they are up and running.
lock(LockItem, LockKind) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
lock(Tid, Ts, LockItem, LockKind);
{Mod, Tid, Ts} ->
Mod:lock(Tid, Ts, LockItem, LockKind);
_ ->
abort(no_transaction)
end.
lock_table(Tab, LockKind) ->
lock({table, Tab}, LockKind).
lock(Tid, Ts, LockItem, LockKind) ->
case element(1, Tid) of
tid ->
case LockItem of
{record, Tab, Key} ->
lock_record(Tid, Ts, Tab, Key, LockKind);
{table, Tab} ->
lock_table(Tid, Ts, Tab, LockKind);
{global, GlobalKey, Nodes} ->
global_lock(Tid, Ts, GlobalKey, LockKind, Nodes);
_ ->
abort({bad_type, LockItem})
end;
_Protocol ->
[]
end.
%% Grab a read lock on a whole table
read_lock_table(Tab) ->
lock({table, Tab}, read),
ok.
%% Grab a write lock on a whole table
write_lock_table(Tab) ->
lock({table, Tab}, write),
ok.
lock_record(Tid, Ts, Tab, Key, LockKind) when is_atom(Tab) ->
Store = Ts#tidstore.store,
Oid = {Tab, Key},
case LockKind of
read ->
mnesia_locker:rlock(Tid, Store, Oid);
write ->
mnesia_locker:wlock(Tid, Store, Oid);
sticky_write ->
mnesia_locker:sticky_wlock(Tid, Store, Oid);
none ->
[];
_ ->
abort({bad_type, Tab, LockKind})
end;
lock_record(_Tid, _Ts, Tab, _Key, _LockKind) ->
abort({bad_type, Tab}).
lock_table(Tid, Ts, Tab, LockKind) when is_atom(Tab) ->
Store = Ts#tidstore.store,
case LockKind of
read ->
mnesia_locker:rlock_table(Tid, Store, Tab);
write ->
mnesia_locker:wlock_table(Tid, Store, Tab);
load ->
mnesia_locker:load_lock_table(Tid, Store, Tab);
sticky_write ->
mnesia_locker:sticky_wlock_table(Tid, Store, Tab);
none ->
[];
_ ->
abort({bad_type, Tab, LockKind})
end;
lock_table(_Tid, _Ts, Tab, _LockKind) ->
abort({bad_type, Tab}).
global_lock(Tid, Ts, Item, Kind, Nodes) when is_list(Nodes) ->
case element(1, Tid) of
tid ->
Store = Ts#tidstore.store,
GoodNs = good_global_nodes(Nodes),
if
Kind /= read, Kind /= write ->
abort({bad_type, Kind});
true ->
mnesia_locker:global_lock(Tid, Store, Item, Kind, GoodNs)
end;
_Protocol ->
[]
end;
global_lock(_Tid, _Ts, _Item, _Kind, Nodes) ->
abort({bad_type, Nodes}).
good_global_nodes(Nodes) ->
Recover = [node() | val(recover_nodes)],
mnesia_lib:intersect(Nodes, Recover).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Access within an activity - updates
write(Val) when is_tuple(Val), tuple_size(Val) > 2 ->
Tab = element(1, Val),
write(Tab, Val, write);
write(Val) ->
abort({bad_type, Val}).
s_write(Val) when is_tuple(Val), tuple_size(Val) > 2 ->
Tab = element(1, Val),
write(Tab, Val, sticky_write).
write(Tab, Val, LockKind) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
write(Tid, Ts, Tab, Val, LockKind);
{Mod, Tid, Ts} ->
Mod:write(Tid, Ts, Tab, Val, LockKind);
_ ->
abort(no_transaction)
end.
write(Tid, Ts, Tab, Val, LockKind)
when is_atom(Tab), Tab /= schema, is_tuple(Val), tuple_size(Val) > 2 ->
case element(1, Tid) of
ets ->
?ets_insert(Tab, Val),
ok;
tid ->
Store = Ts#tidstore.store,
Oid = {Tab, element(2, Val)},
case LockKind of
write ->
mnesia_locker:wlock(Tid, Store, Oid);
sticky_write ->
mnesia_locker:sticky_wlock(Tid, Store, Oid);
_ ->
abort({bad_type, Tab, LockKind})
end,
write_to_store(Tab, Store, Oid, Val);
Protocol ->
do_dirty_write(Protocol, Tab, Val)
end;
write(_Tid, _Ts, Tab, Val, LockKind) ->
abort({bad_type, Tab, Val, LockKind}).
write_to_store(Tab, Store, Oid, Val) ->
case ?catch_val({Tab, record_validation}) of
{RecName, Arity, Type}
when tuple_size(Val) == Arity, RecName == element(1, Val) ->
case Type of
bag ->
?ets_insert(Store, {Oid, Val, write});
_ ->
?ets_delete(Store, Oid),
?ets_insert(Store, {Oid, Val, write})
end,
ok;
{'EXIT', _} ->
abort({no_exists, Tab});
_ ->
abort({bad_type, Val})
end.
delete({Tab, Key}) ->
delete(Tab, Key, write);
delete(Oid) ->
abort({bad_type, Oid}).
s_delete({Tab, Key}) ->
delete(Tab, Key, sticky_write);
s_delete(Oid) ->
abort({bad_type, Oid}).
delete(Tab, Key, LockKind) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
delete(Tid, Ts, Tab, Key, LockKind);
{Mod, Tid, Ts} ->
Mod:delete(Tid, Ts, Tab, Key, LockKind);
_ ->
abort(no_transaction)
end.
delete(Tid, Ts, Tab, Key, LockKind)
when is_atom(Tab), Tab /= schema ->
case element(1, Tid) of
ets ->
?ets_delete(Tab, Key),
ok;
tid ->
Store = Ts#tidstore.store,
Oid = {Tab, Key},
case LockKind of
write ->
mnesia_locker:wlock(Tid, Store, Oid);
sticky_write ->
mnesia_locker:sticky_wlock(Tid, Store, Oid);
_ ->
abort({bad_type, Tab, LockKind})
end,
?ets_delete(Store, Oid),
?ets_insert(Store, {Oid, Oid, delete}),
ok;
Protocol ->
do_dirty_delete(Protocol, Tab, Key)
end;
delete(_Tid, _Ts, Tab, _Key, _LockKind) ->
abort({bad_type, Tab}).
delete_object(Val) when is_tuple(Val), tuple_size(Val) > 2 ->
Tab = element(1, Val),
delete_object(Tab, Val, write);
delete_object(Val) ->
abort({bad_type, Val}).
s_delete_object(Val) when is_tuple(Val), tuple_size(Val) > 2 ->
Tab = element(1, Val),
delete_object(Tab, Val, sticky_write);
s_delete_object(Val) ->
abort({bad_type, Val}).
delete_object(Tab, Val, LockKind) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
delete_object(Tid, Ts, Tab, Val, LockKind);
{Mod, Tid, Ts} ->
Mod:delete_object(Tid, Ts, Tab, Val, LockKind);
_ ->
abort(no_transaction)
end.
delete_object(Tid, Ts, Tab, Val, LockKind)
when is_atom(Tab), Tab /= schema, is_tuple(Val), tuple_size(Val) > 2 ->
case has_var(Val) of
false ->
do_delete_object(Tid, Ts, Tab, Val, LockKind);
true ->
abort({bad_type, Tab, Val})
end;
delete_object(_Tid, _Ts, Tab, _Key, _LockKind) ->
abort({bad_type, Tab}).
do_delete_object(Tid, Ts, Tab, Val, LockKind) ->
case element(1, Tid) of
ets ->
?ets_match_delete(Tab, Val),
ok;
tid ->
Store = Ts#tidstore.store,
Oid = {Tab, element(2, Val)},
case LockKind of
write ->
mnesia_locker:wlock(Tid, Store, Oid);
sticky_write ->
mnesia_locker:sticky_wlock(Tid, Store, Oid);
_ ->
abort({bad_type, Tab, LockKind})
end,
case val({Tab, setorbag}) of
bag ->
?ets_match_delete(Store, {Oid, Val, '_'}),
?ets_insert(Store, {Oid, Val, delete_object});
_ ->
case ?ets_match_object(Store, {Oid, '_', write}) of
[] ->
?ets_match_delete(Store, {Oid, Val, '_'}),
?ets_insert(Store, {Oid, Val, delete_object});
_ ->
?ets_delete(Store, Oid),
?ets_insert(Store, {Oid, Oid, delete})
end
end,
ok;
Protocol ->
do_dirty_delete_object(Protocol, Tab, Val)
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Access within an activity - read
read(Tab, Key) ->
read(Tab, Key, read).
read({Tab, Key}) ->
read(Tab, Key, read);
read(Oid) ->
abort({bad_type, Oid}).
wread({Tab, Key}) ->
read(Tab, Key, write);
wread(Oid) ->
abort({bad_type, Oid}).
read(Tab, Key, LockKind) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
read(Tid, Ts, Tab, Key, LockKind);
{Mod, Tid, Ts} ->
Mod:read(Tid, Ts, Tab, Key, LockKind);
_ ->
abort(no_transaction)
end.
read(Tid, Ts, Tab, Key, LockKind)
when is_atom(Tab), Tab /= schema ->
case element(1, Tid) of
ets ->
?ets_lookup(Tab, Key);
tid ->
Store = Ts#tidstore.store,
Oid = {Tab, Key},
Objs =
case LockKind of
read ->
mnesia_locker:rlock(Tid, Store, Oid);
write ->
mnesia_locker:rwlock(Tid, Store, Oid);
sticky_write ->
mnesia_locker:sticky_rwlock(Tid, Store, Oid);
_ ->
abort({bad_type, Tab, LockKind})
end,
add_written(?ets_lookup(Store, Oid), Tab, Objs);
_Protocol ->
dirty_read(Tab, Key)
end;
read(_Tid, _Ts, Tab, _Key, _LockKind) ->
abort({bad_type, Tab}).
first(Tab) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
first(Tid, Ts, Tab);
{Mod, Tid, Ts} ->
Mod:first(Tid, Ts, Tab);
_ ->
abort(no_transaction)
end.
first(Tid, Ts, Tab)
when is_atom(Tab), Tab /= schema ->
case element(1, Tid) of
ets ->
?ets_first(Tab);
tid ->
lock_table(Tid, Ts, Tab, read),
do_fixtable(Tab,Ts),
Key = dirty_first(Tab),
stored_keys(Tab,Key,'$end_of_table',Ts,next,
val({Tab, setorbag}));
_Protocol ->
dirty_first(Tab)
end;
first(_Tid, _Ts,Tab) ->
abort({bad_type, Tab}).
last(Tab) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
last(Tid, Ts, Tab);
{Mod, Tid, Ts} ->
Mod:last(Tid, Ts, Tab);
_ ->
abort(no_transaction)
end.
last(Tid, Ts, Tab)
when is_atom(Tab), Tab /= schema ->
case element(1, Tid) of
ets ->
?ets_last(Tab);
tid ->
lock_table(Tid, Ts, Tab, read),
do_fixtable(Tab,Ts),
Key = dirty_last(Tab),
stored_keys(Tab,Key,'$end_of_table',Ts,prev,
val({Tab, setorbag}));
_Protocol ->
dirty_last(Tab)
end;
last(_Tid, _Ts,Tab) ->
abort({bad_type, Tab}).
next(Tab,Key) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS,Tid,Ts} ->
next(Tid,Ts,Tab,Key);
{Mod,Tid,Ts} ->
Mod:next(Tid,Ts,Tab,Key);
_ ->
abort(no_transaction)
end.
next(Tid,Ts,Tab,Key)
when is_atom(Tab), Tab /= schema ->
case element(1, Tid) of
ets ->
?ets_next(Tab,Key);
tid ->
lock_table(Tid, Ts, Tab, read),
do_fixtable(Tab,Ts),
New = (catch dirty_next(Tab,Key)),
stored_keys(Tab,New,Key,Ts,next,
val({Tab, setorbag}));
_Protocol ->
dirty_next(Tab,Key)
end;
next(_Tid, _Ts,Tab,_) ->
abort({bad_type, Tab}).
prev(Tab,Key) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS,Tid,Ts} ->
prev(Tid,Ts,Tab,Key);
{Mod,Tid,Ts} ->
Mod:prev(Tid,Ts,Tab,Key);
_ ->
abort(no_transaction)
end.
prev(Tid,Ts,Tab,Key)
when is_atom(Tab), Tab /= schema ->
case element(1, Tid) of
ets ->
?ets_prev(Tab,Key);
tid ->
lock_table(Tid, Ts, Tab, read),
do_fixtable(Tab,Ts),
New = (catch dirty_prev(Tab,Key)),
stored_keys(Tab,New,Key,Ts,prev,
val({Tab, setorbag}));
_Protocol ->
dirty_prev(Tab,Key)
end;
prev(_Tid, _Ts,Tab,_) ->
abort({bad_type, Tab}).
%% Compensate for transaction written and/or deleted records
stored_keys(Tab,'$end_of_table',Prev,Ts,Op,Type) ->
case ts_keys(Ts#tidstore.store,Tab,Op,Type,[]) of
[] -> '$end_of_table';
Keys when Type == ordered_set->
get_ordered_tskey(Prev,Keys,Op);
Keys ->
get_next_tskey(Prev,Keys,Tab)
end;
stored_keys(Tab,{'EXIT',{aborted,R={badarg,[Tab,Key]}}},
Key,#tidstore{store=Store},Op,Type) ->
%% Had to match on error, ouch..
case ?ets_match(Store, {{Tab, Key}, '_', '$1'}) of
[] -> abort(R);
Ops ->
case lists:last(Ops) of
[delete] -> abort(R);
_ ->
case ts_keys(Store,Tab,Op,Type,[]) of
[] -> '$end_of_table';
Keys -> get_next_tskey(Key,Keys,Tab)
end
end
end;
stored_keys(_,{'EXIT',{aborted,R}},_,_,_,_) ->
abort(R);
stored_keys(Tab,Key,Prev,#tidstore{store=Store},Op,ordered_set) ->
case ?ets_match(Store, {{Tab, Key}, '_', '$1'}) of
[] ->
Keys = ts_keys(Store,Tab,Op,ordered_set,[Key]),
get_ordered_tskey(Prev,Keys,Op);
Ops ->
case lists:last(Ops) of
[delete] ->
mnesia:Op(Tab,Key);
_ ->
Keys = ts_keys(Store,Tab,Op,ordered_set,[Key]),
get_ordered_tskey(Prev,Keys,Op)
end
end;
stored_keys(Tab,Key,_,#tidstore{store=Store},Op,_) ->
case ?ets_match(Store, {{Tab, Key}, '_', '$1'}) of
[] -> Key;
Ops ->
case lists:last(Ops) of
[delete] -> mnesia:Op(Tab,Key);
_ -> Key
end
end.
get_ordered_tskey('$end_of_table', [First|_],_) -> First;
get_ordered_tskey(Prev, [First|_], next) when Prev < First -> First;
get_ordered_tskey(Prev, [First|_], prev) when Prev > First -> First;
get_ordered_tskey(Prev, [_|R],Op) -> get_ordered_tskey(Prev,R,Op);
get_ordered_tskey(_, [],_) -> '$end_of_table'.
get_next_tskey(Key,Keys,Tab) ->
Next =
if Key == '$end_of_table' -> hd(Keys);
true ->
case lists:dropwhile(fun(A) -> A /= Key end, Keys) of
[] -> hd(Keys); %% First stored key
[Key] -> '$end_of_table';
[Key,Next2|_] -> Next2
end
end,
case Next of
'$end_of_table' -> '$end_of_table';
_ -> %% Really slow anybody got another solution??
case dirty_read(Tab, Next) of
[] -> Next;
_ ->
%% Updated value we already returned this key
get_next_tskey(Next,Keys,Tab)
end
end.
ts_keys(Store, Tab, Op, Type, Def) ->
All = ?ets_match(Store, {{Tab,'$1'},'_','$2'}),
Keys = ts_keys_1(All, Def),
if
Type == ordered_set, Op == prev ->
lists:reverse(lists:sort(Keys));
Type == ordered_set ->
lists:sort(Keys);
Op == next ->
lists:reverse(Keys);
true ->
Keys
end.
ts_keys_1([[Key, write]|R], []) ->
ts_keys_1(R, [Key]);
ts_keys_1([[Key, write]|R], Acc=[Key|_]) ->
ts_keys_1(R, Acc);
ts_keys_1([[Key, write]|R], Acc) ->
ts_keys_1(R, [Key|Acc]);
ts_keys_1([[Key, delete]|R], [Key|Acc]) ->
ts_keys_1(R, Acc);
ts_keys_1([_|R], Acc) ->
ts_keys_1(R, Acc);
ts_keys_1([], Acc) ->
Acc.
%%%%%%%%%%%%%%%%%%%%%
%% Iterators
foldl(Fun, Acc, Tab) ->
foldl(Fun, Acc, Tab, read).
foldl(Fun, Acc, Tab, LockKind) when is_function(Fun) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
foldl(Tid, Ts, Fun, Acc, Tab, LockKind);
{Mod, Tid, Ts} ->
Mod:foldl(Tid, Ts, Fun, Acc, Tab, LockKind);
_ ->
abort(no_transaction)
end.
foldl(ActivityId, Opaque, Fun, Acc, Tab, LockKind) ->
{Type, Prev} = init_iteration(ActivityId, Opaque, Tab, LockKind),
Res = (catch do_foldl(ActivityId, Opaque, Tab, dirty_first(Tab), Fun, Acc, Type, Prev)),
close_iteration(Res, Tab).
do_foldl(A, O, Tab, '$end_of_table', Fun, RAcc, _Type, Stored) ->
lists:foldl(fun(Key, Acc) ->
lists:foldl(Fun, Acc, read(A, O, Tab, Key, read))
end, RAcc, Stored);
do_foldl(A, O, Tab, Key, Fun, Acc, ordered_set, [H | Stored]) when H == Key ->
NewAcc = lists:foldl(Fun, Acc, read(A, O, Tab, Key, read)),
{_, Tid, Ts} = get(mnesia_activity_state),
do_foldl(Tid, Ts, Tab, dirty_next(Tab, Key), Fun, NewAcc, ordered_set, Stored);
do_foldl(A, O, Tab, Key, Fun, Acc, ordered_set, [H | Stored]) when H < Key ->
NewAcc = lists:foldl(Fun, Acc, read(A, O, Tab, H, read)),
{_, Tid, Ts} = get(mnesia_activity_state),
do_foldl(Tid, Ts, Tab, Key, Fun, NewAcc, ordered_set, Stored);
do_foldl(A, O, Tab, Key, Fun, Acc, ordered_set, [H | Stored]) when H > Key ->
NewAcc = lists:foldl(Fun, Acc, read(A, O, Tab, Key, read)),
{_, Tid, Ts} = get(mnesia_activity_state),
do_foldl(Tid, Ts, Tab, dirty_next(Tab, Key), Fun, NewAcc, ordered_set, [H |Stored]);
do_foldl(A, O, Tab, Key, Fun, Acc, Type, Stored) -> %% Type is set or bag
NewAcc = lists:foldl(Fun, Acc, read(A, O, Tab, Key, read)),
NewStored = ordsets:del_element(Key, Stored),
{_, Tid, Ts} = get(mnesia_activity_state),
do_foldl(Tid, Ts, Tab, dirty_next(Tab, Key), Fun, NewAcc, Type, NewStored).
foldr(Fun, Acc, Tab) ->
foldr(Fun, Acc, Tab, read).
foldr(Fun, Acc, Tab, LockKind) when is_function(Fun) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
foldr(Tid, Ts, Fun, Acc, Tab, LockKind);
{Mod, Tid, Ts} ->
Mod:foldr(Tid, Ts, Fun, Acc, Tab, LockKind);
_ ->
abort(no_transaction)
end.
foldr(ActivityId, Opaque, Fun, Acc, Tab, LockKind) ->
{Type, TempPrev} = init_iteration(ActivityId, Opaque, Tab, LockKind),
Prev =
if
Type == ordered_set ->
lists:reverse(TempPrev);
true -> %% Order doesn't matter for set and bag
TempPrev %% Keep the order so we can use ordsets:del_element
end,
Res = (catch do_foldr(ActivityId, Opaque, Tab, dirty_last(Tab), Fun, Acc, Type, Prev)),
close_iteration(Res, Tab).
do_foldr(A, O, Tab, '$end_of_table', Fun, RAcc, _Type, Stored) ->
lists:foldl(fun(Key, Acc) ->
lists:foldl(Fun, Acc, read(A, O, Tab, Key, read))
end, RAcc, Stored);
do_foldr(A, O, Tab, Key, Fun, Acc, ordered_set, [H | Stored]) when H == Key ->
NewAcc = lists:foldl(Fun, Acc, read(A, O, Tab, Key, read)),
{_, Tid, Ts} = get(mnesia_activity_state),
do_foldr(Tid, Ts, Tab, dirty_prev(Tab, Key), Fun, NewAcc, ordered_set, Stored);
do_foldr(A, O, Tab, Key, Fun, Acc, ordered_set, [H | Stored]) when H > Key ->
NewAcc = lists:foldl(Fun, Acc, read(A, O, Tab, H, read)),
{_, Tid, Ts} = get(mnesia_activity_state),
do_foldr(Tid, Ts, Tab, Key, Fun, NewAcc, ordered_set, Stored);
do_foldr(A, O, Tab, Key, Fun, Acc, ordered_set, [H | Stored]) when H < Key ->
NewAcc = lists:foldl(Fun, Acc, read(A, O, Tab, Key, read)),
{_, Tid, Ts} = get(mnesia_activity_state),
do_foldr(Tid, Ts, Tab, dirty_prev(Tab, Key), Fun, NewAcc, ordered_set, [H |Stored]);
do_foldr(A, O, Tab, Key, Fun, Acc, Type, Stored) -> %% Type is set or bag
NewAcc = lists:foldl(Fun, Acc, read(A, O, Tab, Key, read)),
NewStored = ordsets:del_element(Key, Stored),
{_, Tid, Ts} = get(mnesia_activity_state),
do_foldr(Tid, Ts, Tab, dirty_prev(Tab, Key), Fun, NewAcc, Type, NewStored).
init_iteration(ActivityId, Opaque, Tab, LockKind) ->
lock(ActivityId, Opaque, {table, Tab}, LockKind),
Type = val({Tab, setorbag}),
Previous = add_previous(ActivityId, Opaque, Type, Tab),
St = val({Tab, storage_type}),
if
St == unknown ->
ignore;
true ->
mnesia_lib:db_fixtable(St, Tab, true)
end,
{Type, Previous}.
close_iteration(Res, Tab) ->
case val({Tab, storage_type}) of
unknown ->
ignore;
St ->
mnesia_lib:db_fixtable(St, Tab, false)
end,
case Res of
{'EXIT', {aborted, What}} ->
abort(What);
{'EXIT', What} ->
abort(What);
_ ->
Res
end.
add_previous(_ActivityId, non_transaction, _Type, _Tab) ->
[];
add_previous(_Tid, Ts, _Type, Tab) ->
Previous = ?ets_match(Ts#tidstore.store, {{Tab, '$1'}, '_', write}),
lists:sort(lists:concat(Previous)).
%% This routine fixes up the return value from read/1 so that
%% it is correct with respect to what this particular transaction
%% has already written, deleted .... etc
add_written([], _Tab, Objs) ->
Objs; % standard normal fast case
add_written(Written, Tab, Objs) ->
case val({Tab, setorbag}) of
bag ->
add_written_to_bag(Written, Objs, []);
_ ->
add_written_to_set(Written)
end.
add_written_to_set(Ws) ->
case lists:last(Ws) of
{_, _, delete} -> [];
{_, Val, write} -> [Val];
{_, _, delete_object} -> []
end.
add_written_to_bag([{_, Val, write} | Tail], Objs, Ack) ->
add_written_to_bag(Tail, lists:delete(Val, Objs), [Val | Ack]);
add_written_to_bag([], Objs, Ack) ->
Objs ++ lists:reverse(Ack); %% Oldest write first as in ets
add_written_to_bag([{_, _ , delete} | Tail], _Objs, _Ack) ->
%% This transaction just deleted all objects
%% with this key
add_written_to_bag(Tail, [], []);
add_written_to_bag([{_, Val, delete_object} | Tail], Objs, Ack) ->
add_written_to_bag(Tail, lists:delete(Val, Objs), lists:delete(Val, Ack)).
match_object(Pat) when is_tuple(Pat), tuple_size(Pat) > 2 ->
Tab = element(1, Pat),
match_object(Tab, Pat, read);
match_object(Pat) ->
abort({bad_type, Pat}).
match_object(Tab, Pat, LockKind) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
match_object(Tid, Ts, Tab, Pat, LockKind);
{Mod, Tid, Ts} ->
Mod:match_object(Tid, Ts, Tab, Pat, LockKind);
_ ->
abort(no_transaction)
end.
match_object(Tid, Ts, Tab, Pat, LockKind)
when is_atom(Tab), Tab /= schema, is_tuple(Pat), tuple_size(Pat) > 2 ->
case element(1, Tid) of
ets ->
mnesia_lib:db_match_object(ram_copies, Tab, Pat);
tid ->
Key = element(2, Pat),
case has_var(Key) of
false -> lock_record(Tid, Ts, Tab, Key, LockKind);
true -> lock_table(Tid, Ts, Tab, LockKind)
end,
Objs = dirty_match_object(Tab, Pat),
add_written_match(Ts#tidstore.store, Pat, Tab, Objs);
_Protocol ->
dirty_match_object(Tab, Pat)
end;
match_object(_Tid, _Ts, Tab, Pat, _LockKind) ->
abort({bad_type, Tab, Pat}).
add_written_match(S, Pat, Tab, Objs) ->
Ops = find_ops(S, Tab, Pat),
FixedRes = add_match(Ops, Objs, val({Tab, setorbag})),
MS = ets:match_spec_compile([{Pat, [], ['$_']}]),
ets:match_spec_run(FixedRes, MS).
find_ops(S, Tab, Pat) ->
GetWritten = [{{{Tab, '_'}, '_', write}, [], ['$_']},
{{{Tab, '_'}, '_', delete}, [], ['$_']},
{{{Tab, '_'}, Pat, delete_object}, [], ['$_']}],
ets:select(S, GetWritten).
add_match([], Objs, _Type) ->
Objs;
add_match(Written, Objs, ordered_set) ->
%% Must use keysort which is stable
add_ordered_match(lists:keysort(1,Written), Objs, []);
add_match([{Oid, _, delete}|R], Objs, Type) ->
add_match(R, deloid(Oid, Objs), Type);
add_match([{_Oid, Val, delete_object}|R], Objs, Type) ->
add_match(R, lists:delete(Val, Objs), Type);
add_match([{_Oid, Val, write}|R], Objs, bag) ->
add_match(R, [Val | lists:delete(Val, Objs)], bag);
add_match([{Oid, Val, write}|R], Objs, set) ->
add_match(R, [Val | deloid(Oid,Objs)],set).
%% For ordered_set only !!
add_ordered_match(Written = [{{_, Key}, _, _}|_], [Obj|Objs], Acc)
when Key > element(2, Obj) ->
add_ordered_match(Written, Objs, [Obj|Acc]);
add_ordered_match([{{_, Key}, Val, write}|Rest], Objs =[Obj|_], Acc)
when Key < element(2, Obj) ->
add_ordered_match(Rest, [Val|Objs],Acc);
add_ordered_match([{{_, Key}, _, _DelOP}|Rest], Objs =[Obj|_], Acc)
when Key < element(2, Obj) ->
add_ordered_match(Rest,Objs,Acc);
%% Greater than last object
add_ordered_match([{_, Val, write}|Rest], [], Acc) ->
add_ordered_match(Rest, [Val], Acc);
add_ordered_match([_|Rest], [], Acc) ->
add_ordered_match(Rest, [], Acc);
%% Keys are equal from here
add_ordered_match([{_, Val, write}|Rest], [_Obj|Objs], Acc) ->
add_ordered_match(Rest, [Val|Objs], Acc);
add_ordered_match([{_, _Val, delete}|Rest], [_Obj|Objs], Acc) ->
add_ordered_match(Rest, Objs, Acc);
add_ordered_match([{_, Val, delete_object}|Rest], [Val|Objs], Acc) ->
add_ordered_match(Rest, Objs, Acc);
add_ordered_match([{_, _, delete_object}|Rest], Objs, Acc) ->
add_ordered_match(Rest, Objs, Acc);
add_ordered_match([], Objs, Acc) ->
lists:reverse(Acc, Objs).
%% For select chunk
add_sel_match(Sorted, Objs, ordered_set) ->
add_sel_ordered_match(Sorted, Objs, []);
add_sel_match(Written, Objs, Type) ->
add_sel_match(Written, Objs, Type, []).
add_sel_match([], Objs, _Type, Acc) ->
{Objs,lists:reverse(Acc)};
add_sel_match([Op={Oid, _, delete}|R], Objs, Type, Acc) ->
case deloid(Oid, Objs) of
Objs ->
add_sel_match(R, Objs, Type, [Op|Acc]);
NewObjs when Type == set ->
add_sel_match(R, NewObjs, Type, Acc);
NewObjs -> %% If bag we may get more in next chunk
add_sel_match(R, NewObjs, Type, [Op|Acc])
end;
add_sel_match([Op = {_Oid, Val, delete_object}|R], Objs, Type, Acc) ->
case lists:delete(Val, Objs) of
Objs ->
add_sel_match(R, Objs, Type, [Op|Acc]);
NewObjs when Type == set ->
add_sel_match(R, NewObjs, Type, Acc);
NewObjs ->
add_sel_match(R, NewObjs, Type, [Op|Acc])
end;
add_sel_match([Op={Oid={_,Key}, Val, write}|R], Objs, bag, Acc) ->
case lists:keymember(Key, 2, Objs) of
true ->
add_sel_match(R,[Val|lists:delete(Val,Objs)],bag,
[{Oid,Val,delete_object}|Acc]);
false ->
add_sel_match(R,Objs,bag,[Op|Acc])
end;
add_sel_match([Op={Oid, Val, write}|R], Objs, set, Acc) ->
case deloid(Oid,Objs) of
Objs ->
add_sel_match(R, Objs,set, [Op|Acc]);
NewObjs ->
add_sel_match(R, [Val | NewObjs],set, Acc)
end.
%% For ordered_set only !!
add_sel_ordered_match(Written = [{{_, Key}, _, _}|_], [Obj|Objs],Acc)
when Key > element(2, Obj) ->
add_sel_ordered_match(Written, Objs, [Obj|Acc]);
add_sel_ordered_match([{{_, Key}, Val, write}|Rest], Objs =[Obj|_],Acc)
when Key < element(2, Obj) ->
add_sel_ordered_match(Rest,[Val|Objs],Acc);
add_sel_ordered_match([{{_, Key}, _, _DelOP}|Rest], Objs =[Obj|_], Acc)
when Key < element(2, Obj) ->
add_sel_ordered_match(Rest,Objs,Acc);
%% Greater than last object
add_sel_ordered_match(Ops1, [], Acc) ->
{lists:reverse(Acc), Ops1};
%% Keys are equal from here
add_sel_ordered_match([{_, Val, write}|Rest], [_Obj|Objs], Acc) ->
add_sel_ordered_match(Rest, [Val|Objs], Acc);
add_sel_ordered_match([{_, _Val, delete}|Rest], [_Obj|Objs], Acc) ->
add_sel_ordered_match(Rest, Objs, Acc);
add_sel_ordered_match([{_, Val, delete_object}|Rest], [Val|Objs], Acc) ->
add_sel_ordered_match(Rest, Objs, Acc);
add_sel_ordered_match([{_, _, delete_object}|Rest], Objs, Acc) ->
add_sel_ordered_match(Rest, Objs, Acc);
add_sel_ordered_match([], Objs, Acc) ->
{lists:reverse(Acc, Objs),[]}.
deloid(_Oid, []) ->
[];
deloid({Tab, Key}, [H | T]) when element(2, H) == Key ->
deloid({Tab, Key}, T);
deloid(Oid, [H | T]) ->
[H | deloid(Oid, T)].
%%%%%%%%%%%%%%%%%%
% select
select(Tab, Pat) ->
select(Tab, Pat, read).
select(Tab, Pat, LockKind)
when is_atom(Tab), Tab /= schema, is_list(Pat) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
select(Tid, Ts, Tab, Pat, LockKind);
{Mod, Tid, Ts} ->
Mod:select(Tid, Ts, Tab, Pat, LockKind);
_ ->
abort(no_transaction)
end;
select(Tab, Pat, _Lock) ->
abort({badarg, Tab, Pat}).
select(Tid, Ts, Tab, Spec, LockKind) ->
SelectFun = fun(FixedSpec) -> dirty_select(Tab, FixedSpec) end,
fun_select(Tid, Ts, Tab, Spec, LockKind, Tab, SelectFun).
fun_select(Tid, Ts, Tab, Spec, LockKind, TabPat, SelectFun) ->
case element(1, Tid) of
ets ->
mnesia_lib:db_select(ram_copies, Tab, Spec);
tid ->
select_lock(Tid,Ts,LockKind,Spec,Tab),
Store = Ts#tidstore.store,
Written = ?ets_match_object(Store, {{TabPat, '_'}, '_', '_'}),
case Written of
[] ->
%% Nothing changed in the table during this transaction,
%% Simple case get results from [d]ets
SelectFun(Spec);
_ ->
%% Hard (slow case) records added or deleted earlier
%% in the transaction, have to cope with that.
Type = val({Tab, setorbag}),
FixedSpec = get_record_pattern(Spec),
TabRecs = SelectFun(FixedSpec),
FixedRes = add_match(Written, TabRecs, Type),
CMS = ets:match_spec_compile(Spec),
ets:match_spec_run(FixedRes, CMS)
end;
_Protocol ->
SelectFun(Spec)
end.
select_lock(Tid,Ts,LockKind,Spec,Tab) ->
%% Avoid table lock if possible
case Spec of
[{HeadPat,_, _}] when is_tuple(HeadPat), tuple_size(HeadPat) > 2 ->
Key = element(2, HeadPat),
case has_var(Key) of
false -> lock_record(Tid, Ts, Tab, Key, LockKind);
true -> lock_table(Tid, Ts, Tab, LockKind)
end;
_ ->
lock_table(Tid, Ts, Tab, LockKind)
end.
%% Breakable Select
select(Tab, Pat, NObjects, LockKind)
when is_atom(Tab), Tab /= schema, is_list(Pat), is_integer(NObjects) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
select(Tid, Ts, Tab, Pat, NObjects, LockKind);
{Mod, Tid, Ts} ->
Mod:select(Tid, Ts, Tab, Pat, NObjects, LockKind);
_ ->
abort(no_transaction)
end;
select(Tab, Pat, NObjects, _Lock) ->
abort({badarg, Tab, Pat, NObjects}).
select(Tid, Ts, Tab, Spec, NObjects, LockKind) ->
Where = val({Tab,where_to_read}),
Type = mnesia_lib:storage_type_at_node(Where,Tab),
InitFun = fun(FixedSpec) -> dirty_sel_init(Where,Tab,FixedSpec,NObjects,Type) end,
fun_select(Tid,Ts,Tab,Spec,LockKind,Tab,InitFun,NObjects,Where,Type).
-record(mnesia_select, {tab,tid,node,storage,cont,written=[],spec,type,orig}).
fun_select(Tid, Ts, Tab, Spec, LockKind, TabPat, Init, NObjects, Node, Storage) ->
Def = #mnesia_select{tid=Tid,node=Node,storage=Storage,tab=Tab,orig=Spec},
case element(1, Tid) of
ets ->
select_state(mnesia_lib:db_select_init(ram_copies,Tab,Spec,NObjects),Def);
tid ->
select_lock(Tid,Ts,LockKind,Spec,Tab),
Store = Ts#tidstore.store,
do_fixtable(Tab, Store),
Written0 = ?ets_match_object(Store, {{TabPat, '_'}, '_', '_'}),
case Written0 of
[] ->
%% Nothing changed in the table during this transaction,
%% Simple case get results from [d]ets
select_state(Init(Spec),Def);
_ ->
%% Hard (slow case) records added or deleted earlier
%% in the transaction, have to cope with that.
Type = val({Tab, setorbag}),
Written =
if Type == ordered_set -> %% Sort stable
lists:keysort(1,Written0);
true ->
Written0
end,
FixedSpec = get_record_pattern(Spec),
CMS = ets:match_spec_compile(Spec),
trans_select(Init(FixedSpec),
Def#mnesia_select{written=Written,spec=CMS,type=Type, orig=FixedSpec})
end;
_Protocol ->
select_state(Init(Spec),Def)
end.
select(Cont) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
select_cont(Tid,Ts,Cont);
{Mod, Tid, Ts} ->
Mod:select_cont(Tid,Ts,Cont);
_ ->
abort(no_transaction)
end.
select_cont(_Tid,_Ts,'$end_of_table') ->
'$end_of_table';
select_cont(Tid,_Ts,State=#mnesia_select{tid=Tid,cont=Cont, orig=Ms})
when element(1,Tid) == ets ->
case Cont of
'$end_of_table' -> '$end_of_table';
_ -> select_state(mnesia_lib:db_select_cont(ram_copies,Cont,Ms),State)
end;
select_cont(Tid,_,State=#mnesia_select{tid=Tid,written=[]}) ->
select_state(dirty_sel_cont(State),State);
select_cont(Tid,_Ts,State=#mnesia_select{tid=Tid}) ->
trans_select(dirty_sel_cont(State), State);
select_cont(_Tid2,_,#mnesia_select{tid=_Tid1}) -> % Missmatching tids
abort(wrong_transaction);
select_cont(_,_,Cont) ->
abort({badarg, Cont}).
trans_select('$end_of_table', #mnesia_select{written=Written0,spec=CMS,type=Type}) ->
Written = add_match(Written0, [], Type),
{ets:match_spec_run(Written, CMS), '$end_of_table'};
trans_select({TabRecs,Cont}, State = #mnesia_select{written=Written0,spec=CMS,type=Type}) ->
{FixedRes,Written} = add_sel_match(Written0, TabRecs, Type),
select_state({ets:match_spec_run(FixedRes, CMS),Cont},
State#mnesia_select{written=Written}).
select_state({Matches, Cont}, MS) ->
{Matches, MS#mnesia_select{cont=Cont}};
select_state('$end_of_table',_) -> '$end_of_table'.
get_record_pattern([]) -> [];
get_record_pattern([{M,C,_B}|R]) ->
[{M,C,['$_']} | get_record_pattern(R)].
all_keys(Tab) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
all_keys(Tid, Ts, Tab, read);
{Mod, Tid, Ts} ->
Mod:all_keys(Tid, Ts, Tab, read);
_ ->
abort(no_transaction)
end.
all_keys(Tid, Ts, Tab, LockKind)
when is_atom(Tab), Tab /= schema ->
Pat0 = val({Tab, wild_pattern}),
Pat = setelement(2, Pat0, '$1'),
Keys = select(Tid, Ts, Tab, [{Pat, [], ['$1']}], LockKind),
case val({Tab, setorbag}) of
bag ->
mnesia_lib:uniq(Keys);
_ ->
Keys
end;
all_keys(_Tid, _Ts, Tab, _LockKind) ->
abort({bad_type, Tab}).
index_match_object(Pat, Attr) when is_tuple(Pat), tuple_size(Pat) > 2 ->
Tab = element(1, Pat),
index_match_object(Tab, Pat, Attr, read);
index_match_object(Pat, _Attr) ->
abort({bad_type, Pat}).
index_match_object(Tab, Pat, Attr, LockKind) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
index_match_object(Tid, Ts, Tab, Pat, Attr, LockKind);
{Mod, Tid, Ts} ->
Mod:index_match_object(Tid, Ts, Tab, Pat, Attr, LockKind);
_ ->
abort(no_transaction)
end.
index_match_object(Tid, Ts, Tab, Pat, Attr, LockKind)
when is_atom(Tab), Tab /= schema, is_tuple(Pat), tuple_size(Pat) > 2 ->
case element(1, Tid) of
ets ->
dirty_index_match_object(Tab, Pat, Attr); % Should be optimized?
tid ->
case mnesia_schema:attr_tab_to_pos(Tab, Attr) of
Pos when Pos =< tuple_size(Pat) ->
case LockKind of
read ->
Store = Ts#tidstore.store,
mnesia_locker:rlock_table(Tid, Store, Tab),
Objs = dirty_index_match_object(Tab, Pat, Attr),
add_written_match(Store, Pat, Tab, Objs);
_ ->
abort({bad_type, Tab, LockKind})
end;
BadPos ->
abort({bad_type, Tab, BadPos})
end;
_Protocol ->
dirty_index_match_object(Tab, Pat, Attr)
end;
index_match_object(_Tid, _Ts, Tab, Pat, _Attr, _LockKind) ->
abort({bad_type, Tab, Pat}).
index_read(Tab, Key, Attr) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
index_read(Tid, Ts, Tab, Key, Attr, read);
{Mod, Tid, Ts} ->
Mod:index_read(Tid, Ts, Tab, Key, Attr, read);
_ ->
abort(no_transaction)
end.
index_read(Tid, Ts, Tab, Key, Attr, LockKind)
when is_atom(Tab), Tab /= schema ->
case element(1, Tid) of
ets ->
dirty_index_read(Tab, Key, Attr); % Should be optimized?
tid ->
Pos = mnesia_schema:attr_tab_to_pos(Tab, Attr),
case LockKind of
read ->
case has_var(Key) of
false ->
Store = Ts#tidstore.store,
Objs = mnesia_index:read(Tid, Store, Tab, Key, Pos),
Pat = setelement(Pos, val({Tab, wild_pattern}), Key),
add_written_match(Store, Pat, Tab, Objs);
true ->
abort({bad_type, Tab, Attr, Key})
end;
_ ->
abort({bad_type, Tab, LockKind})
end;
_Protocol ->
dirty_index_read(Tab, Key, Attr)
end;
index_read(_Tid, _Ts, Tab, _Key, _Attr, _LockKind) ->
abort({bad_type, Tab}).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Dirty access regardless of activities - updates
dirty_write(Val) when is_tuple(Val), tuple_size(Val) > 2 ->
Tab = element(1, Val),
dirty_write(Tab, Val);
dirty_write(Val) ->
abort({bad_type, Val}).
dirty_write(Tab, Val) ->
do_dirty_write(async_dirty, Tab, Val).
do_dirty_write(SyncMode, Tab, Val)
when is_atom(Tab), Tab /= schema, is_tuple(Val), tuple_size(Val) > 2 ->
case ?catch_val({Tab, record_validation}) of
{RecName, Arity, _Type}
when tuple_size(Val) == Arity, RecName == element(1, Val) ->
Oid = {Tab, element(2, Val)},
mnesia_tm:dirty(SyncMode, {Oid, Val, write});
{'EXIT', _} ->
abort({no_exists, Tab});
_ ->
abort({bad_type, Val})
end;
do_dirty_write(_SyncMode, Tab, Val) ->
abort({bad_type, Tab, Val}).
dirty_delete({Tab, Key}) ->
dirty_delete(Tab, Key);
dirty_delete(Oid) ->
abort({bad_type, Oid}).
dirty_delete(Tab, Key) ->
do_dirty_delete(async_dirty, Tab, Key).
do_dirty_delete(SyncMode, Tab, Key) when is_atom(Tab), Tab /= schema ->
Oid = {Tab, Key},
mnesia_tm:dirty(SyncMode, {Oid, Oid, delete});
do_dirty_delete(_SyncMode, Tab, _Key) ->
abort({bad_type, Tab}).
dirty_delete_object(Val) when is_tuple(Val), tuple_size(Val) > 2 ->
Tab = element(1, Val),
dirty_delete_object(Tab, Val);
dirty_delete_object(Val) ->
abort({bad_type, Val}).
dirty_delete_object(Tab, Val) ->
do_dirty_delete_object(async_dirty, Tab, Val).
do_dirty_delete_object(SyncMode, Tab, Val)
when is_atom(Tab), Tab /= schema, is_tuple(Val), tuple_size(Val) > 2 ->
Oid = {Tab, element(2, Val)},
case has_var(Val) of
false ->
mnesia_tm:dirty(SyncMode, {Oid, Val, delete_object});
true ->
abort({bad_type, Tab, Val})
end;
do_dirty_delete_object(_SyncMode, Tab, Val) ->
abort({bad_type, Tab, Val}).
%% A Counter is an Oid being {CounterTab, CounterName}
dirty_update_counter({Tab, Key}, Incr) ->
dirty_update_counter(Tab, Key, Incr);
dirty_update_counter(Counter, _Incr) ->
abort({bad_type, Counter}).
dirty_update_counter(Tab, Key, Incr) ->
do_dirty_update_counter(async_dirty, Tab, Key, Incr).
do_dirty_update_counter(SyncMode, Tab, Key, Incr)
when is_atom(Tab), Tab /= schema, is_integer(Incr) ->
case ?catch_val({Tab, record_validation}) of
{RecName, 3, set} ->
Oid = {Tab, Key},
mnesia_tm:dirty(SyncMode, {Oid, {RecName, Incr}, update_counter});
_ ->
abort({combine_error, Tab, update_counter})
end;
do_dirty_update_counter(_SyncMode, Tab, _Key, Incr) ->
abort({bad_type, Tab, Incr}).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Dirty access regardless of activities - read
dirty_read({Tab, Key}) ->
dirty_read(Tab, Key);
dirty_read(Oid) ->
abort({bad_type, Oid}).
dirty_read(Tab, Key)
when is_atom(Tab), Tab /= schema ->
%% case catch ?ets_lookup(Tab, Key) of
%% {'EXIT', _} ->
%% Bad luck, we have to perform a real lookup
dirty_rpc(Tab, mnesia_lib, db_get, [Tab, Key]);
%% Val ->
%% Val
%% end;
dirty_read(Tab, _Key) ->
abort({bad_type, Tab}).
dirty_match_object(Pat) when is_tuple(Pat), tuple_size(Pat) > 2 ->
Tab = element(1, Pat),
dirty_match_object(Tab, Pat);
dirty_match_object(Pat) ->
abort({bad_type, Pat}).
dirty_match_object(Tab, Pat)
when is_atom(Tab), Tab /= schema, is_tuple(Pat), tuple_size(Pat) > 2 ->
dirty_rpc(Tab, ?MODULE, remote_dirty_match_object, [Tab, Pat]);
dirty_match_object(Tab, Pat) ->
abort({bad_type, Tab, Pat}).
remote_dirty_match_object(Tab, Pat) ->
Key = element(2, Pat),
case has_var(Key) of
false ->
mnesia_lib:db_match_object(Tab, Pat);
true ->
PosList = val({Tab, index}),
remote_dirty_match_object(Tab, Pat, PosList)
end.
remote_dirty_match_object(Tab, Pat, [Pos | Tail]) when Pos =< tuple_size(Pat) ->
IxKey = element(Pos, Pat),
case has_var(IxKey) of
false ->
mnesia_index:dirty_match_object(Tab, Pat, Pos);
true ->
remote_dirty_match_object(Tab, Pat, Tail)
end;
remote_dirty_match_object(Tab, Pat, []) ->
mnesia_lib:db_match_object(Tab, Pat);
remote_dirty_match_object(Tab, Pat, _PosList) ->
abort({bad_type, Tab, Pat}).
dirty_select(Tab, Spec) when is_atom(Tab), Tab /= schema, is_list(Spec) ->
dirty_rpc(Tab, ?MODULE, remote_dirty_select, [Tab, Spec]);
dirty_select(Tab, Spec) ->
abort({bad_type, Tab, Spec}).
remote_dirty_select(Tab, Spec) ->
case Spec of
[{HeadPat, _, _}] when is_tuple(HeadPat), tuple_size(HeadPat) > 2 ->
Key = element(2, HeadPat),
case has_var(Key) of
false ->
mnesia_lib:db_select(Tab, Spec);
true ->
PosList = val({Tab, index}),
remote_dirty_select(Tab, Spec, PosList)
end;
_ ->
mnesia_lib:db_select(Tab, Spec)
end.
remote_dirty_select(Tab, [{HeadPat,_, _}] = Spec, [Pos | Tail])
when is_tuple(HeadPat), tuple_size(HeadPat) > 2, Pos =< tuple_size(HeadPat) ->
Key = element(Pos, HeadPat),
case has_var(Key) of
false ->
Recs = mnesia_index:dirty_select(Tab, HeadPat, Pos),
%% Returns the records without applying the match spec
%% The actual filtering is handled by the caller
CMS = ets:match_spec_compile(Spec),
case val({Tab, setorbag}) of
ordered_set ->
ets:match_spec_run(lists:sort(Recs), CMS);
_ ->
ets:match_spec_run(Recs, CMS)
end;
true ->
remote_dirty_select(Tab, Spec, Tail)
end;
remote_dirty_select(Tab, Spec, _) ->
mnesia_lib:db_select(Tab, Spec).
dirty_sel_init(Node,Tab,Spec,NObjects,Type) ->
do_dirty_rpc(Tab,Node,mnesia_lib,db_select_init,[Type,Tab,Spec,NObjects]).
dirty_sel_cont(#mnesia_select{cont='$end_of_table'}) -> '$end_of_table';
dirty_sel_cont(#mnesia_select{node=Node,tab=Tab,storage=Type,cont=Cont,orig=Ms}) ->
do_dirty_rpc(Tab,Node,mnesia_lib,db_select_cont,[Type,Cont,Ms]).
dirty_all_keys(Tab) when is_atom(Tab), Tab /= schema ->
case ?catch_val({Tab, wild_pattern}) of
{'EXIT', _} ->
abort({no_exists, Tab});
Pat0 ->
Pat = setelement(2, Pat0, '$1'),
Keys = dirty_select(Tab, [{Pat, [], ['$1']}]),
case val({Tab, setorbag}) of
bag -> mnesia_lib:uniq(Keys);
_ -> Keys
end
end;
dirty_all_keys(Tab) ->
abort({bad_type, Tab}).
dirty_index_match_object(Pat, Attr) when is_tuple(Pat), tuple_size(Pat) > 2 ->
Tab = element(1, Pat),
dirty_index_match_object(Tab, Pat, Attr);
dirty_index_match_object(Pat, _Attr) ->
abort({bad_type, Pat}).
dirty_index_match_object(Tab, Pat, Attr)
when is_atom(Tab), Tab /= schema, is_tuple(Pat), tuple_size(Pat) > 2 ->
case mnesia_schema:attr_tab_to_pos(Tab, Attr) of
Pos when Pos =< tuple_size(Pat) ->
case has_var(element(2, Pat)) of
false ->
dirty_match_object(Tab, Pat);
true ->
Elem = element(Pos, Pat),
case has_var(Elem) of
false ->
dirty_rpc(Tab, mnesia_index, dirty_match_object,
[Tab, Pat, Pos]);
true ->
abort({bad_type, Tab, Attr, Elem})
end
end;
BadPos ->
abort({bad_type, Tab, BadPos})
end;
dirty_index_match_object(Tab, Pat, _Attr) ->
abort({bad_type, Tab, Pat}).
dirty_index_read(Tab, Key, Attr) when is_atom(Tab), Tab /= schema ->
Pos = mnesia_schema:attr_tab_to_pos(Tab, Attr),
case has_var(Key) of
false ->
mnesia_index:dirty_read(Tab, Key, Pos);
true ->
abort({bad_type, Tab, Attr, Key})
end;
dirty_index_read(Tab, _Key, _Attr) ->
abort({bad_type, Tab}).
dirty_slot(Tab, Slot) when is_atom(Tab), Tab /= schema, is_integer(Slot) ->
dirty_rpc(Tab, mnesia_lib, db_slot, [Tab, Slot]);
dirty_slot(Tab, Slot) ->
abort({bad_type, Tab, Slot}).
dirty_first(Tab) when is_atom(Tab), Tab /= schema ->
dirty_rpc(Tab, mnesia_lib, db_first, [Tab]);
dirty_first(Tab) ->
abort({bad_type, Tab}).
dirty_last(Tab) when is_atom(Tab), Tab /= schema ->
dirty_rpc(Tab, mnesia_lib, db_last, [Tab]);
dirty_last(Tab) ->
abort({bad_type, Tab}).
dirty_next(Tab, Key) when is_atom(Tab), Tab /= schema ->
dirty_rpc(Tab, mnesia_lib, db_next_key, [Tab, Key]);
dirty_next(Tab, _Key) ->
abort({bad_type, Tab}).
dirty_prev(Tab, Key) when is_atom(Tab), Tab /= schema ->
dirty_rpc(Tab, mnesia_lib, db_prev_key, [Tab, Key]);
dirty_prev(Tab, _Key) ->
abort({bad_type, Tab}).
dirty_rpc(Tab, M, F, Args) ->
Node = val({Tab, where_to_read}),
do_dirty_rpc(Tab, Node, M, F, Args).
do_dirty_rpc(_Tab, nowhere, _, _, Args) ->
mnesia:abort({no_exists, Args});
do_dirty_rpc(Tab, Node, M, F, Args) ->
case rpc:call(Node, M, F, Args) of
{badrpc, Reason} ->
timer:sleep(20), %% Do not be too eager, and can't use yield on SMP
%% Sync with mnesia_monitor
_ = try sys:get_status(mnesia_monitor) catch _:_ -> ok end,
case mnesia_controller:call({check_w2r, Node, Tab}) of % Sync
NewNode when NewNode =:= Node ->
ErrorTag = mnesia_lib:dirty_rpc_error_tag(Reason),
mnesia:abort({ErrorTag, Args});
NewNode ->
case get(mnesia_activity_state) of
{_Mod, Tid, _Ts} when is_record(Tid, tid) ->
%% In order to perform a consistent
%% retry of a transaction we need
%% to acquire the lock on the NewNode.
%% In this context we do neither know
%% the kind or granularity of the lock.
%% --> Abort the transaction
mnesia:abort({node_not_running, Node});
{error, {node_not_running, _}} ->
%% Mnesia is stopping
mnesia:abort({no_exists, Args});
_ ->
%% Splendid! A dirty retry is safe
%% 'Node' probably went down now
%% Let mnesia_controller get broken link message first
do_dirty_rpc(Tab, NewNode, M, F, Args)
end
end;
Other ->
Other
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Info
%% Info about one table
-spec table_info(atom(), any()) -> any().
table_info(Tab, Item) ->
case get(mnesia_activity_state) of
undefined ->
any_table_info(Tab, Item);
{?DEFAULT_ACCESS, _Tid, _Ts} ->
any_table_info(Tab, Item);
{Mod, Tid, Ts} ->
Mod:table_info(Tid, Ts, Tab, Item);
_ ->
abort(no_transaction)
end.
table_info(_Tid, _Ts, Tab, Item) ->
any_table_info(Tab, Item).
any_table_info(Tab, Item) when is_atom(Tab) ->
case Item of
master_nodes ->
mnesia_recover:get_master_nodes(Tab);
% checkpoints ->
% case ?catch_val({Tab, commit_work}) of
% [{checkpoints, List} | _] -> List;
% No_chk when is_list(No_chk) -> [];
% Else -> info_reply(Else, Tab, Item)
% end;
size ->
raw_table_info(Tab, Item);
memory ->
raw_table_info(Tab, Item);
type ->
case ?catch_val({Tab, setorbag}) of
{'EXIT', _} ->
abort({no_exists, Tab, Item});
Val ->
Val
end;
all ->
case mnesia_schema:get_table_properties(Tab) of
[] ->
abort({no_exists, Tab, Item});
Props ->
lists:map(fun({setorbag, Type}) -> {type, Type};
(Prop) -> Prop end,
Props)
end;
name ->
Tab;
_ ->
case ?catch_val({Tab, Item}) of
{'EXIT', _} ->
abort({no_exists, Tab, Item});
Val ->
Val
end
end;
any_table_info(Tab, _Item) ->
abort({bad_type, Tab}).
raw_table_info(Tab, Item) ->
case ?catch_val({Tab, storage_type}) of
ram_copies ->
info_reply(catch ?ets_info(Tab, Item), Tab, Item);
disc_copies ->
info_reply(catch ?ets_info(Tab, Item), Tab, Item);
disc_only_copies ->
info_reply(catch dets:info(Tab, Item), Tab, Item);
unknown ->
bad_info_reply(Tab, Item);
{'EXIT', _} ->
bad_info_reply(Tab, Item)
end.
info_reply({'EXIT', _Reason}, Tab, Item) ->
bad_info_reply(Tab, Item);
info_reply({error, _Reason}, Tab, Item) ->
bad_info_reply(Tab, Item);
info_reply(Val, _Tab, _Item) ->
Val.
bad_info_reply(_Tab, size) -> 0;
bad_info_reply(_Tab, memory) -> 0;
bad_info_reply(Tab, Item) -> abort({no_exists, Tab, Item}).
%% Raw info about all tables
schema() ->
mnesia_schema:info().
%% Raw info about one tables
schema(Tab) ->
mnesia_schema:info(Tab).
error_description(Err) ->
mnesia_lib:error_desc(Err).
info() ->
case mnesia_lib:is_running() of
yes ->
TmInfo = mnesia_tm:get_info(10000),
Held = system_info(held_locks),
Queued = system_info(lock_queue),
io:format("---> Processes holding locks <--- ~n", []),
lists:foreach(fun(L) -> io:format("Lock: ~p~n", [L]) end,
Held),
io:format( "---> Processes waiting for locks <--- ~n", []),
lists:foreach(fun({Oid, Op, _Pid, Tid, OwnerTid}) ->
io:format("Tid ~p waits for ~p lock "
"on oid ~p owned by ~p ~n",
[Tid, Op, Oid, OwnerTid])
end, Queued),
mnesia_tm:display_info(group_leader(), TmInfo),
Pat = {'_', unclear, '_'},
Uncertain = ets:match_object(mnesia_decision, Pat),
io:format( "---> Uncertain transactions <--- ~n", []),
lists:foreach(fun({Tid, _, Nodes}) ->
io:format("Tid ~w waits for decision "
"from ~w~n",
[Tid, Nodes])
end, Uncertain),
mnesia_controller:info(),
display_system_info(Held, Queued, TmInfo, Uncertain);
_ ->
mini_info()
end,
ok.
mini_info() ->
io:format("===> System info in version ~p, debug level = ~p <===~n",
[system_info(version), system_info(debug)]),
Not =
case system_info(use_dir) of
true -> "";
false -> "NOT "
end,
io:format("~w. Directory ~p is ~sused.~n",
[system_info(schema_location), system_info(directory), Not]),
io:format("use fallback at restart = ~w~n",
[system_info(fallback_activated)]),
Running = system_info(running_db_nodes),
io:format("running db nodes = ~w~n", [Running]),
All = mnesia_lib:all_nodes(),
io:format("stopped db nodes = ~w ~n", [All -- Running]).
display_system_info(Held, Queued, TmInfo, Uncertain) ->
mini_info(),
display_tab_info(),
S = fun(Items) -> [system_info(I) || I <- Items] end,
io:format("~w transactions committed, ~w aborted, "
"~w restarted, ~w logged to disc~n",
S([transaction_commits, transaction_failures,
transaction_restarts, transaction_log_writes])),
{Active, Pending} =
case TmInfo of
{timeout, _} -> {infinity, infinity};
{info, P, A} -> {length(A), length(P)}
end,
io:format("~w held locks, ~w in queue; "
"~w local transactions, ~w remote~n",
[length(Held), length(Queued), Active, Pending]),
Ufold = fun({_, _, Ns}, {C, Old}) ->
New = [N || N <- Ns, not lists:member(N, Old)],
{C + 1, New ++ Old}
end,
{Ucount, Unodes} = lists:foldl(Ufold, {0, []}, Uncertain),
io:format("~w transactions waits for other nodes: ~p~n",
[Ucount, Unodes]).
display_tab_info() ->
MasterTabs = mnesia_recover:get_master_node_tables(),
io:format("master node tables = ~p~n", [lists:sort(MasterTabs)]),
Tabs = system_info(tables),
{Unknown, Ram, Disc, DiscOnly} =
lists:foldl(fun storage_count/2, {[], [], [], []}, Tabs),
io:format("remote = ~p~n", [lists:sort(Unknown)]),
io:format("ram_copies = ~p~n", [lists:sort(Ram)]),
io:format("disc_copies = ~p~n", [lists:sort(Disc)]),
io:format("disc_only_copies = ~p~n", [lists:sort(DiscOnly)]),
Rfoldl = fun(T, Acc) ->
Rpat =
case val({T, access_mode}) of
read_only ->
lists:sort([{A, read_only} || A <- val({T, active_replicas})]);
read_write ->
table_info(T, where_to_commit)
end,
case lists:keysearch(Rpat, 1, Acc) of
{value, {_Rpat, Rtabs}} ->
lists:keyreplace(Rpat, 1, Acc, {Rpat, [T | Rtabs]});
false ->
[{Rpat, [T]} | Acc]
end
end,
Repl = lists:foldl(Rfoldl, [], Tabs),
Rdisp = fun({Rpat, Rtabs}) -> io:format("~p = ~p~n", [Rpat, Rtabs]) end,
lists:foreach(Rdisp, lists:sort(Repl)).
storage_count(T, {U, R, D, DO}) ->
case table_info(T, storage_type) of
unknown -> {[T | U], R, D, DO};
ram_copies -> {U, [T | R], D, DO};
disc_copies -> {U, R, [T | D], DO};
disc_only_copies -> {U, R, D, [T | DO]}
end.
system_info(Item) ->
case catch system_info2(Item) of
{'EXIT',Error} -> abort(Error);
Other -> Other
end.
system_info2(all) ->
Items = system_info_items(mnesia_lib:is_running()),
[{I, system_info(I)} || I <- Items];
system_info2(db_nodes) ->
DiscNs = ?catch_val({schema, disc_copies}),
RamNs = ?catch_val({schema, ram_copies}),
if
is_list(DiscNs), is_list(RamNs) ->
DiscNs ++ RamNs;
true ->
case mnesia_schema:read_nodes() of
{ok, Nodes} -> Nodes;
{error,Reason} -> exit(Reason)
end
end;
system_info2(running_db_nodes) ->
case ?catch_val({current, db_nodes}) of
{'EXIT',_} ->
%% Ensure that we access the intended Mnesia
%% directory. This function may not be called
%% during startup since it will cause the
%% application_controller to get into deadlock
load_mnesia_or_abort(),
mnesia_lib:running_nodes();
Other ->
Other
end;
system_info2(extra_db_nodes) ->
case ?catch_val(extra_db_nodes) of
{'EXIT',_} ->
%% Ensure that we access the intended Mnesia
%% directory. This function may not be called
%% during startup since it will cause the
%% application_controller to get into deadlock
load_mnesia_or_abort(),
mnesia_monitor:get_env(extra_db_nodes);
Other ->
Other
end;
system_info2(directory) ->
case ?catch_val(directory) of
{'EXIT',_} ->
%% Ensure that we access the intended Mnesia
%% directory. This function may not be called
%% during startup since it will cause the
%% application_controller to get into deadlock
load_mnesia_or_abort(),
mnesia_monitor:get_env(dir);
Other ->
Other
end;
system_info2(use_dir) ->
case ?catch_val(use_dir) of
{'EXIT',_} ->
%% Ensure that we access the intended Mnesia
%% directory. This function may not be called
%% during startup since it will cause the
%% application_controller to get into deadlock
load_mnesia_or_abort(),
mnesia_monitor:use_dir();
Other ->
Other
end;
system_info2(schema_location) ->
case ?catch_val(schema_location) of
{'EXIT',_} ->
%% Ensure that we access the intended Mnesia
%% directory. This function may not be called
%% during startup since it will cause the
%% application_controller to get into deadlock
load_mnesia_or_abort(),
mnesia_monitor:get_env(schema_location);
Other ->
Other
end;
system_info2(fallback_activated) ->
case ?catch_val(fallback_activated) of
{'EXIT',_} ->
%% Ensure that we access the intended Mnesia
%% directory. This function may not be called
%% during startup since it will cause the
%% application_controller to get into deadlock
load_mnesia_or_abort(),
mnesia_bup:fallback_exists();
Other ->
Other
end;
system_info2(version) ->
case ?catch_val(version) of
{'EXIT', _} ->
Apps = application:loaded_applications(),
case lists:keysearch(?APPLICATION, 1, Apps) of
{value, {_Name, _Desc, Version}} ->
Version;
false ->
%% Ensure that it does not match
{mnesia_not_loaded, node(), erlang:timestamp()}
end;
Version ->
Version
end;
system_info2(access_module) -> mnesia_monitor:get_env(access_module);
system_info2(auto_repair) -> mnesia_monitor:get_env(auto_repair);
system_info2(is_running) -> mnesia_lib:is_running();
system_info2(backup_module) -> mnesia_monitor:get_env(backup_module);
system_info2(event_module) -> mnesia_monitor:get_env(event_module);
system_info2(debug) -> mnesia_monitor:get_env(debug);
system_info2(dump_log_load_regulation) -> mnesia_monitor:get_env(dump_log_load_regulation);
system_info2(dump_log_write_threshold) -> mnesia_monitor:get_env(dump_log_write_threshold);
system_info2(dump_log_time_threshold) -> mnesia_monitor:get_env(dump_log_time_threshold);
system_info2(dump_log_update_in_place) ->
mnesia_monitor:get_env(dump_log_update_in_place);
system_info2(max_wait_for_decision) -> mnesia_monitor:get_env(max_wait_for_decision);
system_info2(ignore_fallback_at_startup) -> mnesia_monitor:get_env(ignore_fallback_at_startup);
system_info2(fallback_error_function) -> mnesia_monitor:get_env(fallback_error_function);
system_info2(log_version) -> mnesia_log:version();
system_info2(protocol_version) -> mnesia_monitor:protocol_version();
system_info2(schema_version) -> mnesia_schema:version(); %backward compatibility
system_info2(tables) -> val({schema, tables});
system_info2(local_tables) -> val({schema, local_tables});
system_info2(master_node_tables) -> mnesia_recover:get_master_node_tables();
system_info2(subscribers) -> mnesia_subscr:subscribers();
system_info2(checkpoints) -> mnesia_checkpoint:checkpoints();
system_info2(held_locks) -> mnesia_locker:get_held_locks();
system_info2(lock_queue) -> mnesia_locker:get_lock_queue();
system_info2(transactions) -> mnesia_tm:get_transactions();
system_info2(transaction_failures) -> mnesia_lib:read_counter(trans_failures);
system_info2(transaction_commits) -> mnesia_lib:read_counter(trans_commits);
system_info2(transaction_restarts) -> mnesia_lib:read_counter(trans_restarts);
system_info2(transaction_log_writes) -> mnesia_dumper:get_log_writes();
system_info2(core_dir) -> mnesia_monitor:get_env(core_dir);
system_info2(no_table_loaders) -> mnesia_monitor:get_env(no_table_loaders);
system_info2(dc_dump_limit) -> mnesia_monitor:get_env(dc_dump_limit);
system_info2(send_compressed) -> mnesia_monitor:get_env(send_compressed);
system_info2(Item) -> exit({badarg, Item}).
system_info_items(yes) ->
[
access_module,
auto_repair,
backup_module,
checkpoints,
db_nodes,
debug,
directory,
dump_log_load_regulation,
dump_log_time_threshold,
dump_log_update_in_place,
dump_log_write_threshold,
event_module,
extra_db_nodes,
fallback_activated,
held_locks,
ignore_fallback_at_startup,
fallback_error_function,
is_running,
local_tables,
lock_queue,
log_version,
master_node_tables,
max_wait_for_decision,
protocol_version,
running_db_nodes,
schema_location,
schema_version,
subscribers,
tables,
transaction_commits,
transaction_failures,
transaction_log_writes,
transaction_restarts,
transactions,
use_dir,
core_dir,
no_table_loaders,
dc_dump_limit,
send_compressed,
version
];
system_info_items(no) ->
[
auto_repair,
backup_module,
db_nodes,
debug,
directory,
dump_log_load_regulation,
dump_log_time_threshold,
dump_log_update_in_place,
dump_log_write_threshold,
event_module,
extra_db_nodes,
ignore_fallback_at_startup,
fallback_error_function,
is_running,
log_version,
max_wait_for_decision,
protocol_version,
running_db_nodes,
schema_location,
schema_version,
use_dir,
core_dir,
version
].
system_info() ->
IsRunning = mnesia_lib:is_running(),
case IsRunning of
yes ->
TmInfo = mnesia_tm:get_info(10000),
Held = system_info(held_locks),
Queued = system_info(lock_queue),
Pat = {'_', unclear, '_'},
Uncertain = ets:match_object(mnesia_decision, Pat),
display_system_info(Held, Queued, TmInfo, Uncertain);
_ ->
mini_info()
end,
IsRunning.
load_mnesia_or_abort() ->
case mnesia_lib:ensure_loaded(?APPLICATION) of
ok ->
ok;
{error, Reason} ->
abort(Reason)
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Database mgt
create_schema(Ns) ->
mnesia_bup:create_schema(Ns).
delete_schema(Ns) ->
mnesia_schema:delete_schema(Ns).
backup(Opaque) ->
mnesia_log:backup(Opaque).
backup(Opaque, Mod) ->
mnesia_log:backup(Opaque, Mod).
traverse_backup(S, T, Fun, Acc) ->
mnesia_bup:traverse_backup(S, T, Fun, Acc).
traverse_backup(S, SM, T, TM, F, A) ->
mnesia_bup:traverse_backup(S, SM, T, TM, F, A).
install_fallback(Opaque) ->
mnesia_bup:install_fallback(Opaque).
install_fallback(Opaque, Mod) ->
mnesia_bup:install_fallback(Opaque, Mod).
uninstall_fallback() ->
mnesia_bup:uninstall_fallback().
uninstall_fallback(Args) ->
mnesia_bup:uninstall_fallback(Args).
activate_checkpoint(Args) ->
mnesia_checkpoint:activate(Args).
deactivate_checkpoint(Name) ->
mnesia_checkpoint:deactivate(Name).
backup_checkpoint(Name, Opaque) ->
mnesia_log:backup_checkpoint(Name, Opaque).
backup_checkpoint(Name, Opaque, Mod) ->
mnesia_log:backup_checkpoint(Name, Opaque, Mod).
restore(Opaque, Args) ->
mnesia_schema:restore(Opaque, Args).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Table mgt
create_table(Arg) ->
mnesia_schema:create_table(Arg).
create_table(Name, Arg) when is_list(Arg) ->
mnesia_schema:create_table([{name, Name}| Arg]);
create_table(Name, Arg) ->
{aborted, badarg, Name, Arg}.
delete_table(Tab) ->
mnesia_schema:delete_table(Tab).
add_table_copy(Tab, N, S) ->
mnesia_schema:add_table_copy(Tab, N, S).
del_table_copy(Tab, N) ->
mnesia_schema:del_table_copy(Tab, N).
move_table_copy(Tab, From, To) ->
mnesia_schema:move_table(Tab, From, To).
add_table_index(Tab, Ix) ->
mnesia_schema:add_table_index(Tab, Ix).
del_table_index(Tab, Ix) ->
mnesia_schema:del_table_index(Tab, Ix).
transform_table(Tab, Fun, NewA) ->
case catch val({Tab, record_name}) of
{'EXIT', Reason} ->
mnesia:abort(Reason);
OldRN ->
mnesia_schema:transform_table(Tab, Fun, NewA, OldRN)
end.
transform_table(Tab, Fun, NewA, NewRN) ->
mnesia_schema:transform_table(Tab, Fun, NewA, NewRN).
change_table_copy_type(T, N, S) ->
mnesia_schema:change_table_copy_type(T, N, S).
clear_table(Tab) ->
case get(mnesia_activity_state) of
State = {Mod, Tid, _Ts} when element(1, Tid) =/= tid ->
transaction(State, fun() -> do_clear_table(Tab) end, [], infinity, Mod, sync);
undefined ->
transaction(undefined, fun() -> do_clear_table(Tab) end, [], infinity, ?DEFAULT_ACCESS, sync);
_ -> %% Not allowed for clear_table
mnesia:abort({aborted, nested_transaction})
end.
do_clear_table(Tab) ->
case get(mnesia_activity_state) of
{?DEFAULT_ACCESS, Tid, Ts} ->
clear_table(Tid, Ts, Tab, '_');
{Mod, Tid, Ts} ->
Mod:clear_table(Tid, Ts, Tab, '_');
_ ->
abort(no_transaction)
end.
clear_table(Tid, Ts, Tab, Obj) when element(1, Tid) =:= tid ->
Store = Ts#tidstore.store,
mnesia_locker:wlock_table(Tid, Store, Tab),
Oid = {Tab, '_'},
?ets_insert(Store, {Oid, Obj, clear_table}),
ok.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Table mgt - user properties
read_table_property(Tab, PropKey) ->
val({Tab, user_property, PropKey}).
write_table_property(Tab, Prop) ->
mnesia_schema:write_table_property(Tab, Prop).
delete_table_property(Tab, PropKey) ->
mnesia_schema:delete_table_property(Tab, PropKey).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Table mgt - user properties
change_table_frag(Tab, FragProp) ->
mnesia_schema:change_table_frag(Tab, FragProp).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Table mgt - table load
%% Dump a ram table to disc
dump_tables(Tabs) ->
mnesia_schema:dump_tables(Tabs).
%% allow the user to wait for some tables to be loaded
wait_for_tables(Tabs, Timeout) ->
mnesia_controller:wait_for_tables(Tabs, Timeout).
force_load_table(Tab) ->
case mnesia_controller:force_load_table(Tab) of
ok -> yes; % Backwards compatibility
Other -> Other
end.
change_table_access_mode(T, Access) ->
mnesia_schema:change_table_access_mode(T, Access).
change_table_load_order(T, O) ->
mnesia_schema:change_table_load_order(T, O).
change_table_majority(T, M) ->
mnesia_schema:change_table_majority(T, M).
set_master_nodes(Nodes) when is_list(Nodes) ->
UseDir = system_info(use_dir),
IsRunning = system_info(is_running),
case IsRunning of
yes ->
CsPat = {{'_', cstruct}, '_'},
Cstructs0 = ?ets_match_object(mnesia_gvar, CsPat),
Cstructs = [Cs || {_, Cs} <- Cstructs0],
log_valid_master_nodes(Cstructs, Nodes, UseDir, IsRunning);
_NotRunning ->
case UseDir of
true ->
mnesia_lib:lock_table(schema),
Res =
case mnesia_schema:read_cstructs_from_disc() of
{ok, Cstructs} ->
log_valid_master_nodes(Cstructs, Nodes, UseDir, IsRunning);
{error, Reason} ->
{error, Reason}
end,
mnesia_lib:unlock_table(schema),
Res;
false ->
ok
end
end;
set_master_nodes(Nodes) ->
{error, {bad_type, Nodes}}.
log_valid_master_nodes(Cstructs, Nodes, UseDir, IsRunning) ->
Fun = fun(Cs) ->
Copies = mnesia_lib:copy_holders(Cs),
Valid = mnesia_lib:intersect(Nodes, Copies),
{Cs#cstruct.name, Valid}
end,
Args = lists:map(Fun, Cstructs),
mnesia_recover:log_master_nodes(Args, UseDir, IsRunning).
set_master_nodes(Tab, Nodes) when is_list(Nodes) ->
UseDir = system_info(use_dir),
IsRunning = system_info(is_running),
case IsRunning of
yes ->
case ?catch_val({Tab, cstruct}) of
{'EXIT', _} ->
{error, {no_exists, Tab}};
Cs ->
case Nodes -- mnesia_lib:copy_holders(Cs) of
[] ->
Args = [{Tab , Nodes}],
mnesia_recover:log_master_nodes(Args, UseDir, IsRunning);
BadNodes ->
{error, {no_exists, Tab, BadNodes}}
end
end;
_NotRunning ->
case UseDir of
true ->
mnesia_lib:lock_table(schema),
Res =
case mnesia_schema:read_cstructs_from_disc() of
{ok, Cstructs} ->
case lists:keysearch(Tab, 2, Cstructs) of
{value, Cs} ->
case Nodes -- mnesia_lib:copy_holders(Cs) of
[] ->
Args = [{Tab , Nodes}],
mnesia_recover:log_master_nodes(Args, UseDir, IsRunning);
BadNodes ->
{error, {no_exists, Tab, BadNodes}}
end;
false ->
{error, {no_exists, Tab}}
end;
{error, Reason} ->
{error, Reason}
end,
mnesia_lib:unlock_table(schema),
Res;
false ->
ok
end
end;
set_master_nodes(Tab, Nodes) ->
{error, {bad_type, Tab, Nodes}}.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Misc admin
dump_log() ->
mnesia_controller:sync_dump_log(user).
sync_log() ->
mnesia_monitor:sync_log(latest_log).
subscribe(What) ->
mnesia_subscr:subscribe(self(), What).
unsubscribe(What) ->
mnesia_subscr:unsubscribe(self(), What).
report_event(Event) ->
mnesia_lib:report_system_event({mnesia_user, Event}).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Snmp
snmp_open_table(Tab, Us) ->
mnesia_schema:add_snmp(Tab, Us).
snmp_close_table(Tab) ->
mnesia_schema:del_snmp(Tab).
snmp_get_row(Tab, RowIndex) when is_atom(Tab), Tab /= schema, is_list(RowIndex) ->
case get(mnesia_activity_state) of
{Mod, Tid, Ts=#tidstore{store=Store}} when element(1, Tid) =:= tid ->
case snmp_oid_to_mnesia_key(RowIndex, Tab) of
unknown -> %% Arrg contains fix_string
Ops = find_ops(Store, Tab, val({Tab, wild_pattern})),
SnmpType = val({Tab,snmp}),
Fix = fun({{_,Key},Row,Op}, Res) ->
case mnesia_snmp_hook:key_to_oid(Tab,Key,SnmpType) of
RowIndex ->
case Op of
write -> {ok, Row};
_ ->
undefined
end;
_ ->
Res
end
end,
lists:foldl(Fix, undefined, Ops);
Key ->
case Mod:read(Tid, Ts, Tab, Key, read) of
[Row] ->
{ok, Row};
_ ->
undefined
end
end;
_ ->
dirty_rpc(Tab, mnesia_snmp_hook, get_row, [Tab, RowIndex])
end;
snmp_get_row(Tab, _RowIndex) ->
abort({bad_type, Tab}).
%%%%%%%%%%%%%
snmp_get_next_index(Tab, RowIndex) when is_atom(Tab), Tab /= schema, is_list(RowIndex) ->
{Next,OrigKey} = dirty_rpc(Tab, mnesia_snmp_hook, get_next_index, [Tab, RowIndex]),
case get(mnesia_activity_state) of
{_Mod, Tid, #tidstore{store=Store}} when element(1, Tid) =:= tid ->
case OrigKey of
undefined ->
snmp_order_keys(Store, Tab, RowIndex, []);
_ ->
case ?ets_match(Store, {{Tab,OrigKey}, '_', '$1'}) of
[] -> snmp_order_keys(Store,Tab,RowIndex,[OrigKey]);
Ops ->
case lists:last(Ops) of
[delete] -> snmp_get_next_index(Tab, Next);
_ -> snmp_order_keys(Store,Tab,RowIndex,[OrigKey])
end
end
end;
_ ->
case Next of
endOfTable -> endOfTable;
_ -> {ok, Next}
end
end;
snmp_get_next_index(Tab, _RowIndex) ->
abort({bad_type, Tab}).
snmp_order_keys(Store,Tab,RowIndex,Def) ->
All = ?ets_match(Store, {{Tab,'$1'},'_','$2'}),
SnmpType = val({Tab,snmp}),
Keys0 = [mnesia_snmp_hook:key_to_oid(Tab,Key,SnmpType) ||
Key <- ts_keys_1(All, Def)],
Keys = lists:sort(Keys0),
get_ordered_snmp_key(RowIndex,Keys).
get_ordered_snmp_key(Prev, [First|_]) when Prev < First -> {ok, First};
get_ordered_snmp_key(Prev, [_|R]) ->
get_ordered_snmp_key(Prev, R);
get_ordered_snmp_key(_, []) ->
endOfTable.
%%%%%%%%%%
snmp_get_mnesia_key(Tab, RowIndex) when is_atom(Tab), Tab /= schema, is_list(RowIndex) ->
case get(mnesia_activity_state) of
{_Mod, Tid, Ts} when element(1, Tid) =:= tid ->
Res = dirty_rpc(Tab,mnesia_snmp_hook,get_mnesia_key,[Tab,RowIndex]),
snmp_filter_key(Res, RowIndex, Tab, Ts#tidstore.store);
_ ->
dirty_rpc(Tab, mnesia_snmp_hook, get_mnesia_key, [Tab, RowIndex])
end;
snmp_get_mnesia_key(Tab, _RowIndex) ->
abort({bad_type, Tab}).
snmp_oid_to_mnesia_key(RowIndex, Tab) ->
case mnesia_snmp_hook:oid_to_key(RowIndex, Tab) of
unknown -> %% Contains fix_string needs lookup
case dirty_rpc(Tab,mnesia_snmp_hook,get_mnesia_key,[Tab,RowIndex]) of
{ok, MnesiaKey} -> MnesiaKey;
undefined -> unknown
end;
MnesiaKey ->
MnesiaKey
end.
snmp_filter_key(Res = {ok,Key}, _RowIndex, Tab, Store) ->
case ?ets_lookup(Store, {Tab,Key}) of
[] -> Res;
Ops ->
case lists:last(Ops) of
{_, _, write} -> Res;
_ -> undefined
end
end;
snmp_filter_key(undefined, RowIndex, Tab, Store) ->
case mnesia_snmp_hook:oid_to_key(RowIndex, Tab) of
unknown -> %% Arrg contains fix_string
Ops = find_ops(Store, Tab, val({Tab, wild_pattern})),
SnmpType = val({Tab,snmp}),
Fix = fun({{_,Key},_,Op}, Res) ->
case mnesia_snmp_hook:key_to_oid(Tab,Key,SnmpType) of
RowIndex ->
case Op of
write -> {ok, Key};
_ ->
undefined
end;
_ ->
Res
end
end,
lists:foldl(Fix, undefined, Ops);
Key ->
case ?ets_lookup(Store, {Tab,Key}) of
[] ->
undefined;
Ops ->
case lists:last(Ops) of
{_, _, write} -> {ok, Key};
_ -> undefined
end
end
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Textfile access
load_textfile(F) ->
mnesia_text:load_textfile(F).
dump_to_textfile(F) ->
mnesia_text:dump_to_textfile(F).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% QLC Handles
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
table(Tab) ->
table(Tab, []).
table(Tab,Opts) ->
{[Trav,Lock,NObjects],QlcOptions0} =
qlc_opts(Opts,[{traverse,select},{lock,read},{n_objects,100}]),
TF = case Trav of
{select,Ms} ->
fun() -> qlc_select(select(Tab,Ms,NObjects,Lock)) end;
select ->
fun(Ms) -> qlc_select(select(Tab,Ms,NObjects,Lock)) end;
_ ->
erlang:error({badarg, {Trav,[Tab, Opts]}})
end,
Pre = fun(Arg) -> pre_qlc(Arg, Tab) end,
Post = fun() -> post_qlc(Tab) end,
Info = fun(Tag) -> qlc_info(Tab, Tag) end,
ParentFun = fun() ->
{mnesia_activity, mnesia:get_activity_id()}
end,
Lookup =
case Trav of
{select, _} -> [];
_ ->
LFun = fun(2, Keys) ->
Read = fun(Key) -> read(Tab,Key,Lock) end,
lists:flatmap(Read, Keys);
(Index,Keys) ->
IdxRead = fun(Key) -> index_read(Tab,Key,Index) end,
lists:flatmap(IdxRead, Keys)
end,
[{lookup_fun, LFun}]
end,
MFA = fun(Type) -> qlc_format(Type, Tab, NObjects, Lock, Opts) end,
QlcOptions = [{pre_fun, Pre}, {post_fun, Post},
{info_fun, Info}, {parent_fun, ParentFun},
{format_fun, MFA}|Lookup] ++ QlcOptions0,
qlc:table(TF, QlcOptions).
pre_qlc(Opts, Tab) ->
{_,Tid,_} =
case get(mnesia_activity_state) of
undefined ->
case lists:keysearch(parent_value, 1, Opts) of
{value, {parent_value,{mnesia_activity,undefined}}} ->
abort(no_transaction);
{value, {parent_value,{mnesia_activity,Aid}}} ->
{value,{stop_fun,Stop}} =
lists:keysearch(stop_fun,1,Opts),
put_activity_id(Aid,Stop),
Aid;
_ ->
abort(no_transaction)
end;
Else ->
Else
end,
case element(1,Tid) of
tid -> ok;
_ ->
case ?catch_val({Tab, setorbag}) of
ordered_set -> ok;
_ ->
dirty_rpc(Tab, mnesia_tm, fixtable, [Tab,true,self()]),
ok
end
end.
post_qlc(Tab) ->
case catch get(mnesia_activity_state) of
{_,#tid{},_} -> ok;
_ ->
case ?catch_val({Tab, setorbag}) of
ordered_set ->
ok;
_ ->
dirty_rpc(Tab, mnesia_tm, fixtable, [Tab,false,self()]),
ok
end
end.
qlc_select('$end_of_table') -> [];
qlc_select({[], Cont}) -> qlc_select(select(Cont));
qlc_select({Objects, Cont}) ->
Objects ++ fun() -> qlc_select(select(Cont)) end.
qlc_opts(Opts, Keys) when is_list(Opts) ->
qlc_opts(Opts, Keys, []);
qlc_opts(Option, Keys) ->
qlc_opts([Option], Keys, []).
qlc_opts(Opts, [{Key,Def}|Keys], Acc) ->
Opt = case lists:keysearch(Key,1, Opts) of
{value, {Key,Value}} ->
Value;
false ->
Def
end,
qlc_opts(lists:keydelete(Key,1,Opts),Keys,[Opt|Acc]);
qlc_opts(Opts,[],Acc) -> {lists:reverse(Acc),Opts}.
qlc_info(Tab, num_of_objects) ->
dirty_rpc(Tab, ?MODULE, raw_table_info, [Tab, size]);
qlc_info(_, keypos) -> 2;
qlc_info(_, is_unique_objects) -> true;
qlc_info(Tab, is_unique_keys) ->
case val({Tab, type}) of
set -> true;
ordered_set -> true;
_ -> false
end;
qlc_info(Tab, is_sorted_objects) ->
case val({Tab, type}) of
ordered_set ->
case ?catch_val({Tab, frag_hash}) of
{'EXIT', _} ->
ascending;
_ -> %% Fragmented tables are not ordered
no
end;
_ -> no
end;
qlc_info(Tab, indices) ->
val({Tab,index});
qlc_info(_Tab, _) ->
undefined.
qlc_format(all, Tab, NObjects, Lock, Opts) ->
{?MODULE, table, [Tab,[{n_objects, NObjects}, {lock,Lock}|Opts]]};
qlc_format({match_spec, Ms}, Tab, NObjects, Lock, Opts) ->
{?MODULE, table, [Tab,[{traverse,{select,Ms}},{n_objects, NObjects}, {lock,Lock}|Opts]]};
qlc_format({lookup, 2, Keys}, Tab, _, Lock, _) ->
io_lib:format("lists:flatmap(fun(V) -> "
"~w:read(~w, V, ~w) end, ~w)",
[?MODULE, Tab, Lock, Keys]);
qlc_format({lookup, Index,Keys}, Tab, _, _, _) ->
io_lib:format("lists:flatmap(fun(V) -> "
"~w:index_read(~w, V, ~w) end, ~w)",
[?MODULE, Tab, Index, Keys]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
do_fixtable(Tab, #tidstore{store=Store}) ->
do_fixtable(Tab,Store);
do_fixtable(Tab, Store) ->
case ?catch_val({Tab, setorbag}) of
ordered_set ->
ok;
_ ->
case ?ets_match_object(Store, {fixtable, {Tab, '_'}}) of
[] ->
Node = dirty_rpc(Tab, mnesia_tm, fixtable, [Tab,true,self()]),
?ets_insert(Store, {fixtable, {Tab, Node}});
_ ->
ignore
end,
ok
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Mnemosyne exclusive
get_activity_id() ->
get(mnesia_activity_state).
put_activity_id(Activity) ->
mnesia_tm:put_activity_id(Activity).
put_activity_id(Activity,Fun) ->
mnesia_tm:put_activity_id(Activity,Fun).
