lib/app/data_store.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2014 Alexis Laferrière <alexis.laf@xymus.net>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # Simple data storage services
  18 #
  19 # The implementation varies per platform.
  20 module data_store
  21
  22 import app_base
  23 import serialization
  24
  25 redef class App
  26         # Services to store and load data
  27         fun data_store: DataStore is abstract
  28 end
  29
  30 # Simple data storage facility
  31 interface DataStore
  32
  33         # Get the object stored at `key`, or null if nothing is available
  34         fun [](key: String): nullable Object is abstract
  35
  36         # Store `value` at `key`
  37         fun []=(key: String, value: nullable Serializable) is abstract
  38 end