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Moneta::Adapters::File

Filesystem backend @api public

Public Class Methods

new(options = {}) click to toggle source

@param [Hash] options @option options [String] :dir Directory where files will be stored

# File lib/moneta/adapters/file.rb, line 13
def initialize(options = {})
  raise ArgumentError, 'Option :dir is required' unless @dir = options[:dir]
  FileUtils.mkpath(@dir)
  raise "#{@dir} is not a directory" unless ::File.directory?(@dir)
end

Public Instance Methods

clear(options = {}) click to toggle source

(see Proxy#clear)

# File lib/moneta/adapters/file.rb, line 52
def clear(options = {})
  temp_dir = "#{@dir}-#{$$}-#{Thread.current.object_id}"
  ::File.rename(@dir, temp_dir)
  FileUtils.mkpath(@dir)
  self
rescue Errno::ENOENT
  self
ensure
  FileUtils.rm_rf(temp_dir)
end
create(key, value, options = {}) click to toggle source

(see Proxy#create)

# File lib/moneta/adapters/file.rb, line 83
def create(key, value, options = {})
  path = store_path(key)
  FileUtils.mkpath(::File.dirname(path))
  # Call native java.io.File#createNewFile
  return false unless ::Java::JavaIo::File.new(path).createNewFile
  ::File.open(path, 'wb+') {|f| f.write(value) }
  true
end
delete(key, options = {}) click to toggle source

(see Proxy#delete)

# File lib/moneta/adapters/file.rb, line 44
def delete(key, options = {})
  value = load(key, options)
  ::File.unlink(store_path(key))
  value
rescue Errno::ENOENT
end
increment(key, amount = 1, options = {}) click to toggle source

(see Proxy#increment)

# File lib/moneta/adapters/file.rb, line 64
def increment(key, amount = 1, options = {})
  path = store_path(key)
  FileUtils.mkpath(::File.dirname(path))
  ::File.open(path, ::File::RDWR | ::File::CREAT) do |f|
    Thread.pass until f.flock(::File::LOCK_EX)
    content = f.read
    amount += Utils.to_int(content) unless content.empty?
    content = amount.to_s
    f.pos = 0
    f.write(content)
    f.truncate(content.bytesize)
    amount
  end
end
key?(key, options = {}) click to toggle source

(see Proxy#key?)

# File lib/moneta/adapters/file.rb, line 20
def key?(key, options = {})
  ::File.exist?(store_path(key))
end
load(key, options = {}) click to toggle source

(see Proxy#load)

# File lib/moneta/adapters/file.rb, line 25
def load(key, options = {})
  ::File.read(store_path(key))
rescue Errno::ENOENT
end
store(key, value, options = {}) click to toggle source

(see Proxy#store)

# File lib/moneta/adapters/file.rb, line 31
def store(key, value, options = {})
  temp_file = ::File.join(@dir, "value-#{$$}-#{Thread.current.object_id}")
  path = store_path(key)
  FileUtils.mkpath(::File.dirname(path))
  ::File.open(temp_file, 'wb') {|f| f.write(value) }
  ::File.rename(temp_file, path)
  value
rescue Exception
  File.unlink(temp_file) rescue nil
  raise
end

Protected Instance Methods

store_path(key) click to toggle source
# File lib/moneta/adapters/file.rb, line 108
def store_path(key)
  ::File.join(@dir, key)
end

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