1 {-| Module abstracting the node and instance container implementation.
3 This is currently implemented on top of an 'IntMap', which seems to
4 give the best performance for our workload.
10 Copyright (C) 2009, 2010, 2011 Google Inc.
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful, but
18 WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
29 module Ganeti.HTools.Container
53 -- * Element functions
58 import qualified Data.IntMap as IntMap
60 import qualified Ganeti.HTools.Types as T
63 type Container = IntMap.IntMap
65 -- | Locate a key in the map (must exist).
66 find :: Key -> Container a -> a
69 -- | Add or update one element to the map.
70 add :: Key -> a -> Container a -> Container a
73 -- | Add or update two elements of the map.
74 addTwo :: Key -> a -> Key -> a -> Container a -> Container a
75 addTwo k1 v1 k2 v2 = add k1 v1 . add k2 v2
77 -- | Compute the name of an element in a container.
78 nameOf :: (T.Element a) => Container a -> Key -> String
79 nameOf c k = T.nameOf $ find k c
81 -- | Find an element by name in a Container; this is a very slow function.
82 findByName :: (T.Element a, Monad m) =>
83 Container a -> String -> m a
85 let all_elems = IntMap.elems c
86 result = filter ((n `elem`) . T.allNames) all_elems
89 _ -> fail $ "Wrong number of elems found with name " ++ n