Module: Campchair::Store

Defined in:
lib/campchair/store.rb

Class Method Summary collapse

Class Method Details

.decode(value) ⇒ Object 



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# File 'lib/campchair/store.rb', line 17

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

.encode(value) ⇒ Object 



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# File 'lib/campchair/store.rb', line 13

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

.generate_key ⇒ Object 



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# File 'lib/campchair/store.rb', line 8

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

.included(base) ⇒ Object 



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# File 'lib/campchair/store.rb', line 21

def included(base)
  base.class_eval do
    include Enumerable

    class << self
      attr_writer :db_name, :db

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

      def db_path=(value)
        @db = nil unless @db_path == value
        @db_path = value
      end

      def db_name
        @db_name || name
      end

      def db
        @db ||= create_db
      end

      def exists?(key)
        db.exists?(key)
      end

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

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

      def <<(value)
        key = Campchair::Store.generate_key
        self[key] = value
        return key
      end

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

      def all
        db.keys.map { |key| self[key] }
      end

      def each(&block)
        db.values.each(&block)
      end

    protected

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

    end # class << self

  end # base.class_eval
end