Class: Iev::DbCache

Inherits:
Object
  • Object
show all
Defined in:
lib/iev/db_cache.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dir) ⇒ DbCache

Returns a new instance of DbCache.

Parameters:

  • dir (String) —

    DB directory



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# File 'lib/iev/db_cache.rb', line 11

def initialize(dir)
  @dir = dir
  FileUtils.mkdir_p @dir
  file_version = "#{@dir}/version"
  File.exist? file_version or
    File.write file_version, VERSION, encoding: "utf-8"
end

Instance Attribute Details

#dir ⇒ String (readonly)

Returns:

  • (String) 


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# File 'lib/iev/db_cache.rb', line 8

def dir
  @dir
end

Instance Method Details

#[](key) ⇒ String

Read item

Parameters:

  • key (String)

Returns:

  • (String) 


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# File 'lib/iev/db_cache.rb', line 33

def [](key)
  file = filename key
  return unless File.exist? file

  File.read(file, encoding: "utf-8")
end

#[]=(key, value) ⇒ Object

Save item

Parameters:

  • key (String)
  • value (String) —

    Bibitem xml serialization



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# File 'lib/iev/db_cache.rb', line 22

def []=(key, value)
  return if value.nil?

  prefix_dir = "#{@dir}/#{prefix(key)}"
  FileUtils.mkdir_p prefix_dir
  File.write filename(key), value, encoding: "utf-8"
end

#all ⇒ Array<Hash>

Returns all items

Returns:

  • (Array<Hash>) 


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# File 'lib/iev/db_cache.rb', line 57

def all
  Dir.glob("#{@dir}/**/*.xml").sort.map do |f|
    File.read(f, encoding: "utf-8")
  end
end

#check_version? ⇒ TrueClass, FalseClass

Check if version of the DB match to the gem version.

Returns:

  • (TrueClass, FalseClass) 


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# File 'lib/iev/db_cache.rb', line 72

def check_version?
  v = File.read "#{@dir}/version", encoding: "utf-8"
  v == VERSION
end

#delete(key) ⇒ Object

Delete item

Parameters:

  • key (String) 


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# File 'lib/iev/db_cache.rb', line 65

def delete(key)
  file = filename key
  File.delete file if File.exist? file
end

#fetched(key) ⇒ String

Return fetched date

Parameters:

  • key (String)

Returns:

  • (String) 


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# File 'lib/iev/db_cache.rb', line 43

def fetched(key)
  value = self[key]
  return unless value

  # if value =~ /^not_found/
  #   value.match(/\d{4}-\d{2}-\d{2}/).to_s
  # else
  doc = Nokogiri::XML value
  doc.at("/bibitem/fetched")&.text
  # end
end

#set_version ⇒ Iev::DbCache

Set version of the DB to the gem version.

Returns:



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# File 'lib/iev/db_cache.rb', line 79

def set_version
  File.write "#{@dir}/version", VERSION, encoding: "utf-8"
  self
end