Class: Juno::Adapters::File

Inherits:
Base
  • Object
show all
Defined in:
lib/juno/adapters/file.rb

Overview

Filesystem backend

Instance Method Summary collapse

Methods inherited from Base

#[], #[]=, #close, #fetch

Constructor Details

#initialize(options = {}) ⇒ File

Returns a new instance of File.

Raises:

  • (ArgumentError) 


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# File 'lib/juno/adapters/file.rb', line 8

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

Instance Method Details

#clear(options = {}) ⇒ Object 



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# File 'lib/juno/adapters/file.rb', line 43

def clear(options = {})
  temp_dir = "#{@dir}-#{$$}-#{Thread.current.object_id}"
  ::File.rename(@dir, temp_dir)
  FileUtils.mkpath(@dir)
  FileUtils.rm_rf(temp_dir)
  self
rescue Errno::ENOENT
  self
end

#delete(key, options = {}) ⇒ Object 



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# File 'lib/juno/adapters/file.rb', line 36

def delete(key, options = {})
  value = load(key, options)
  ::File.unlink(store_path(key))
  value
rescue Errno::ENOENT
end

#key?(key, options = {}) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/juno/adapters/file.rb', line 14

def key?(key, options = {})
  ::File.exist?(store_path(key))
end

#load(key, options = {}) ⇒ Object 



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# File 'lib/juno/adapters/file.rb', line 18

def load(key, options = {})
  ::File.read(store_path(key))
rescue Errno::ENOENT
end

#store(key, value, options = {}) ⇒ Object 



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# File 'lib/juno/adapters/file.rb', line 23

def store(key, value, options = {})
  path = store_path(key)
  temp_file = ::File.join(@dir, "value-#{$$}-#{Thread.current.object_id}")
  FileUtils.mkpath(::File.dirname(path))
  ::File.open(temp_file, 'wb') {|file| file.write(value) }
  ::File.unlink(path) if ::File.exist?(path)
  ::File.rename(temp_file, path)
  value
rescue Errno::ENOENT
  ::File.unlink(temp_file) rescue nil
  value
end