Class: FileSystem

Inherits:
Object show all
Defined in:
lib/handset_detection/cache/filesystem.rb

Overview

– Copyright © Richard Uren 2016 <[email protected]> All Rights Reserved

LICENSE: Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ++

Instance Method Summary collapse

Constructor Details

#initialize(config = {}) ⇒ FileSystem

Construct a new File cache object.

param string dir



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# File 'lib/handset_detection/cache/filesystem.rb', line 32

def initialize(config={})
  if config.include?('cache') and config['cache'].include?('file') and not config['cache']['file']['directory'].blank?
    dir = config['cache']['file']['directory']
  else
    dir = Dir.tmpdir
  end
  dir += File::SEPARATOR unless dir.match(/#{File::SEPARATOR}$/)
  raise 'Directory does not exist.' unless File.directory? dir
  raise 'Directory is not writable.' unless File.writable? dir
  @dir = dir
  @prefix = (config.include?('cache') and config['cache'].include?('prefix')) ? config['cache']['prefix'] : 'hd40'
end

Instance Method Details

#del(key) ⇒ Object

Delete key



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# File 'lib/handset_detection/cache/filesystem.rb', line 68

def del(key)
  fname = get_file_path key 
  return true unless File.file? fname
  File.unlink fname
end

#flush ⇒ Object

Flush cache



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# File 'lib/handset_detection/cache/filesystem.rb', line 75

def flush
  files = Dir.glob @dir + @prefix + '*'
  files.each do |file|
    File.unlink file if File.file? file
  end
  true
end

#get(key) ⇒ Object

Get key



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# File 'lib/handset_detection/cache/filesystem.rb', line 47

def get(key)
  fname = get_file_path key 
  return nil unless File.file? fname

  data = File.readlines fname 
  exp = data.shift.to_i
  return nil if Time.now.to_i > exp and exp != -1

  Marshal::load data.join('')
end

#get_file_path(key) ⇒ Object

Get fully qualified path to file



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# File 'lib/handset_detection/cache/filesystem.rb', line 84

def get_file_path(key)
  @dir + key 
end

#set(key, data, ttl) ⇒ Object

Set key



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# File 'lib/handset_detection/cache/filesystem.rb', line 60

def set(key, data, ttl)
  fname = get_file_path key 
  File.open(fname, 'w') { |f| f.write((Time.now.to_i + ttl).to_s + "\n" + Marshal::dump(data)) }
  true
end