Module: Campchair::LevelDB

Defined in:
lib/campchair/leveldb.rb

Class Method Summary collapse

Class Method Details

.decode(value) ⇒ Object 



16
17
18
 
# File 'lib/campchair/leveldb.rb', line 16

def decode(value)
  Marshal.load(value)
end

.encode(value) ⇒ Object 



12
13
14
 
# File 'lib/campchair/leveldb.rb', line 12

def encode(value)
  Marshal.dump(value)
end

.generate_key ⇒ Object 



7
8
9
10
 
# File 'lib/campchair/leveldb.rb', line 7

def generate_key
  @alpha ||= [('a'..'f'), ('0'..'9')].map(&:to_a).flatten
  (0...40).map { @alpha[rand(@alpha.size)] }.join
end

.included(base) ⇒ Object 



20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/campchair/leveldb.rb', line 20

def included(base)
  base.class_eval do
    class << self
      attr_writer :db_path, :db_name, :db

      def db_path
        @db_path || File.join(Campchair.db_path, db_name)
      end

      def db_name
        @db_name || name
      end

      def db
        @db ||= create_db
      end

      def [](key)
        val = db[key]
        val && Campchair::LevelDB.decode(db[key])
      end

      def []=(key, value)
        db[key] = Campchair::LevelDB.encode(value)
      end

      def <<(value)
        id = Campchair::LevelDB.generate_key
        self[id] = value
        return id
      end

      def delete(key)
        db.delete(key)
      end

    protected

      def create_db
        FileUtils.mkdir_p(db_path)
        ::LevelDB::DB.new(db_path)
      end

    end # class << self

  end # base.class_eval
end