Class: Nanoc::Core::Store 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.

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.

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.



49
50
51
52
 
# File 'lib/nanoc/core/store.rb', line 49

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.



34
35
36
 
# File 'lib/nanoc/core/store.rb', line 34

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.



39
40
41
 
# File 'lib/nanoc/core/store.rb', line 39

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. 



19
20
21
22
23
24
 
# File 'lib/nanoc/core/store.rb', line 19

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. 



27
28
29
30
 
# File 'lib/nanoc/core/store.rb', line 27

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) 


59
60
61
 
# File 'lib/nanoc/core/store.rb', line 59

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) 


68
69
70
 
# File 'lib/nanoc/core/store.rb', line 68

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.



76
77
78
79
80
 
# File 'lib/nanoc/core/store.rb', line 76

def load
  Nanoc::Core::Instrumentor.call(:store_loaded, self.class) do
    load_uninstrumented
  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.



86
87
88
89
90
91
92
 
# File 'lib/nanoc/core/store.rb', line 86

def store
  # NOTE: Yes, the “store stored” name is a little silly. Maybe stores
  # need to be renamed to databases or so.
  Nanoc::Core::Instrumentor.call(:store_stored, self.class) do
    store_uninstrumented
  end
end