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pdb.erl
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pdb.erl
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%% @copyright 2010-2011 Zuse Institute Berlin
%% and onScale solutions GmbH
% 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.
%% @author Florian Schintke <schintke@onscale.de>
%% @doc DB for a process internal state (lika a gen_component).
%% This abstraction allows for easy switching between
%% erlang:put/get/erase and ets:insert/lookup/delete
%% @end
%% @version $Id$
-module(pdb).
-author('schintke@onscale.de').
-vsn('$Id$').
-ifdef(with_export_type_support).
-export_type([tableid/0]).
-endif.
-export([new/2, get/2, set/2, delete/2, tab2list/1]).
-include("scalaris.hrl").
%% put/get variant
-type tableid() :: atom().
-spec new(TableName::atom(), [set | ordered_set | bag | duplicate_bag |
public | protected | private |
named_table | {keypos, integer()} |
{heir, pid(), term()} | {heir,none} |
{write_concurrency, boolean()}]) -> tableid().
new(TableName, _Params) ->
TableName.
-spec get(term(), tableid()) -> tuple() | undefined.
get(Key, _TableName) ->
erlang:get(Key).
-spec set(tuple(), tableid()) -> ok.
set(NewTuple, _TableName) ->
erlang:put(element(1, NewTuple), NewTuple),
ok.
-spec delete(term(), tableid()) -> ok.
delete(Key, _TableName) ->
erlang:erase(Key),
ok.
-spec tab2list(tableid()) -> [term()].
tab2list(_TableName) ->
[ X || {_,X} <- erlang:get()].
%% %% ets variant (only for debugging! has performance issues with msg_delay)
%% -type tableid() :: tid() | atom().
%% new(TableName, Params) ->
%% Name = ets:new(TableName, Params).
%%
%% get(Key, TableName) ->
%% case ets:lookup(TableName, Key) of
%% [] -> undefined;
%% [Entry] -> Entry
%% end.
%%
%% set(NewTuple, TableName) ->
%% ets:insert(TableName, NewTuple),
%% ok.
%%
%% delete(Key, TableName) ->
%% ets:delete(TableName, Key),
%% ok.
%%
%% tab2list(TableName) ->
%% ets:tab2list(TableName).