Class: Nanoc::Core::Store Abstract Private

Inherits:
Object
  • Object
show all
Includes:
ContractsSupport
Defined in:
lib/nanoc/core/store.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

This class is abstract.

Subclasses must implement #data and #data=, and may implement #no_data_found and #version_mismatch_detected.

An abstract superclass for classes that need to store data to the filesystem, such as checksums, cached compiled content and dependency graphs.

Each store has a version number. When attempting to load data from a store that has an incompatible version number, no data will be loaded, but #version_mismatch_detected will be called.

Instance Attribute Summary collapse

Loading and storing data collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ContractsSupport

enabled?, included, setup_once, warn_about_performance

Constructor Details

#initialize(filename, version) ⇒ Store

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Creates a new store for the given filename.

Parameters:

  • filename (String) —

    The name of the file where data will be loaded from and stored to.

  • version (Numeric) —

    The version number corresponding to the file format the data is in. When the file format changes, the version number should be incremented.



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# File 'lib/nanoc/core/store.rb', line 37

def initialize(filename, version)
  @filename = filename
  @version  = version
end

Instance Attribute Details

#filename ⇒ String (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns The name of the file where data will be loaded from and stored to.

Returns:

  • (String) —

    The name of the file where data will be loaded from and stored to.



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# File 'lib/nanoc/core/store.rb', line 22

def filename
  @filename
end

#version ⇒ Numeric (readonly)

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns The version number corresponding to the file format the data is in. When the file format changes, the version number should be incremented.

Returns:

  • (Numeric) —

    The version number corresponding to the file format the data is in. When the file format changes, the version number should be incremented.



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# File 'lib/nanoc/core/store.rb', line 27

def version
  @version
end

Class Method Details

.tmp_path_for(store_name:, config:) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/nanoc/core/store.rb', line 45

def self.tmp_path_for(store_name:, config:)
  File.absolute_path(
    File.join(tmp_path_prefix(config.output_dir), store_name),
    config.dir,
  )
end

.tmp_path_prefix(output_dir) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/nanoc/core/store.rb', line 53

def self.tmp_path_prefix(output_dir)
  dir = Digest::SHA1.hexdigest(output_dir)[0..12]
  File.join('tmp', 'nanoc', dir)
end

Instance Method Details

#data ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method is abstract.

This method must be implemented by the subclass.

Returns The data that should be written to the disk.

Returns:

  • The data that should be written to the disk

Raises:

  • (NotImplementedError) 


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# File 'lib/nanoc/core/store.rb', line 63

def data
  raise NotImplementedError.new('Nanoc::Core::Store subclasses must implement #data and #data=')
end

#data=(new_data) ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method is abstract.

This method must be implemented by the subclass.

This method returns an undefined value.

Parameters:

  • new_data —

    The data that has been loaded from the disk

Raises:

  • (NotImplementedError) 


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# File 'lib/nanoc/core/store.rb', line 72

def data=(new_data) # rubocop:disable Lint/UnusedMethodArgument
  raise NotImplementedError.new('Nanoc::Core::Store subclasses must implement #data and #data=')
end

#load ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Loads the data from the filesystem into memory. This method will set the

loaded data using the {#data=} method.



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# File 'lib/nanoc/core/store.rb', line 80

def load
  return unless File.file?(filename)

  begin
    pstore.transaction do
      return if pstore[:version] != version

      self.data = pstore[:data]
    end
  rescue
    FileUtils.rm_f(filename)
    load
  end
end

#store ⇒ void

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

This method returns an undefined value.

Stores the data contained in memory to the filesystem. This method will

use the {#data} method to fetch the data that should be written.



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# File 'lib/nanoc/core/store.rb', line 99

def store
  FileUtils.mkdir_p(File.dirname(filename))

  pstore.transaction do
    pstore[:data]    = data
    pstore[:version] = version
  end
end