Class: Aspera::PersistencyFolder

Inherits:
Object
  • Object
show all
Defined in:
lib/aspera/persistency_folder.rb

Overview

Persist data on file system

Instance Method Summary collapse

Constructor Details

#initialize(folder) ⇒ PersistencyFolder

Returns a new instance of PersistencyFolder.



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# File 'lib/aspera/persistency_folder.rb', line 15

def initialize(folder)
  @cache = {}
  @folder = folder
  Log.log.debug{"persistency folder: #{@folder}"}
end

Instance Method Details

#current_files(persist_category) ⇒ Object 



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# File 'lib/aspera/persistency_folder.rb', line 77

def current_files(persist_category)
  Dir[File.join(@folder, persist_category + '*' + FILE_SUFFIX)]
end

#current_items(persist_category) ⇒ Object 



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# File 'lib/aspera/persistency_folder.rb', line 81

def current_items(persist_category)
  current_files(persist_category).each_with_object({}) {|i, h| h[File.basename(i, FILE_SUFFIX)] = File.read(i)}
end

#delete(object_id) ⇒ Object

Delete persisted item

Parameters:

  • object_id (String) —

    Identifier of persisted item



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# File 'lib/aspera/persistency_folder.rb', line 55

def delete(object_id)
  persist_filepath = id_to_filepath(object_id)
  Log.log.debug{"persistency deleting: #{persist_filepath}"}
  FileUtils.rm_f(persist_filepath)
  @cache.delete(object_id)
end

#garbage_collect(persist_category, max_age_seconds = nil) ⇒ Object

Delete persisted items



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# File 'lib/aspera/persistency_folder.rb', line 63

def garbage_collect(persist_category, max_age_seconds=nil)
  garbage_files = current_files(persist_category)
  if !max_age_seconds.nil?
    current_time = Time.now
    garbage_files.select! { |filepath| (current_time - File.stat(filepath).mtime).to_i > max_age_seconds}
  end
  garbage_files.each do |filepath|
    File.delete(filepath)
    Log.log.debug{"persistency deleted expired: #{filepath}"}
  end
  @cache.clear
  return garbage_files
end

#get(object_id) ⇒ String?

Get value of persisted item

Returns:

  • (String, nil) —

    Value of persisted id



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# File 'lib/aspera/persistency_folder.rb', line 23

def get(object_id)
  Log.log.debug{"persistency get: #{object_id}"}
  if @cache.key?(object_id)
    Log.log.debug('got from memory cache')
  else
    persist_filepath = id_to_filepath(object_id)
    Log.log.debug{"persistency = #{persist_filepath}"}
    if File.exist?(persist_filepath)
      Log.log.debug('got from file cache')
      @cache[object_id] = File.read(persist_filepath)
    end
  end
  return @cache[object_id]
end

#put(object_id, value) ⇒ nil

Set value of persisted item

Parameters:

  • object_id (String) —

    Identifier of persisted item

  • value (String) —

    Value of persisted item

Returns:

  • (nil) 


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# File 'lib/aspera/persistency_folder.rb', line 42

def put(object_id, value)
  Aspera.assert_type(value, String)
  persist_filepath = id_to_filepath(object_id)
  Log.log.debug{"persistency saving: #{persist_filepath}"}
  FileUtils.rm_f(persist_filepath)
  File.write(persist_filepath, value)
  Environment.restrict_file_access(persist_filepath)
  @cache[object_id] = value
  nil
end