Class: InlineData::DB

Inherits:
Object
  • Object
show all
Defined in:
lib/inline_data/db.rb

Direct Known Subclasses

JSON, YAML

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data_store) ⇒ DB

Returns a new instance of DB.



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# File 'lib/inline_data/db.rb', line 8

def initialize(data_store)
  @file = data_store
  @db_pos = @file.pos
  @existed = @db_pos != @file.size
  @data = @existed ? load : nil
  @file.rewind
  @contents = @file.read @db_pos
end

Instance Attribute Details

#data ⇒ Object

Returns the value of attribute data.



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# File 'lib/inline_data/db.rb', line 36

def data
  @data
end

Class Method Details

.default(file) ⇒ Object 



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# File 'lib/inline_data/db.rb', line 17

def self.default(file)
  if Kernel.const_defined? :DATA
    new Kernel.const_get :DATA
  else
    from file
  end
end

.from(filename) ⇒ Object 



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# File 'lib/inline_data/db.rb', line 25

def self.from(filename)
  f = File.new filename

  loop do
    line = f.gets
    break if line.nil? || line.chomp == '__END__'
  end

  new f
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/inline_data/db.rb', line 48

def close
  @file.close unless @file.nil? || @file.closed?
end

#file_lock ⇒ Object 



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# File 'lib/inline_data/db.rb', line 4

def file_lock
  @file.flock(File::LOCK_NB | File::LOCK_EX)
end

#save ⇒ Object 



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# File 'lib/inline_data/db.rb', line 38

def save
  db_str = dump

  File.open @file.path, 'w+' do |f|
    f.puts @contents
    f.puts '__END__' unless @existed
    f.puts db_str
  end
end