File Cache Store

A cache store implementation which stores everything on the filesystem.

Methods

Constants

DIR_FORMATTER = "%03X"
FILENAME_MAX_SIZE = 226
FILEPATH_MAX_SIZE = 900
GITKEEP_FILES = [".gitkeep", ".keep"].freeze

Attributes

[R] cache_path

Class Public methods

new(cache_path, **options)

📝 Source code 
# File activesupport/lib/active_support/cache/file_store.rb, line 20
      def initialize(cache_path, **options)
        super(options)
        @cache_path = cache_path.to_s
      end
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supports_cache_versioning?()

Advertise cache versioning support.

📝 Source code 
# File activesupport/lib/active_support/cache/file_store.rb, line 26
      def self.supports_cache_versioning?
        true
      end
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Instance Public methods

cleanup(options = nil)

Preemptively iterates through all stored keys and removes the ones which have expired.

📝 Source code 
# File activesupport/lib/active_support/cache/file_store.rb, line 40
      def cleanup(options = nil)
        options = merged_options(options)
        search_dir(cache_path) do |fname|
          entry = read_entry(fname, **options)
          delete_entry(fname, **options) if entry && entry.expired?
        end
      end
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clear(options = nil)

Deletes all items from the cache. In this case it deletes all the entries in the specified file store directory except for .keep or .gitkeep. Be careful which directory is specified in your config file when using FileStore because everything in that directory will be deleted.

📝 Source code 
# File activesupport/lib/active_support/cache/file_store.rb, line 33
      def clear(options = nil)
        root_dirs = (Dir.children(cache_path) - GITKEEP_FILES)
        FileUtils.rm_r(root_dirs.collect { |f| File.join(cache_path, f) })
      rescue Errno::ENOENT, Errno::ENOTEMPTY
      end
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decrement(name, amount = 1, options = nil)

Decrement a cached integer value. Returns the updated value.

If the key is unset, it will be set to -amount.

cache.decrement("foo") # => -1

To set a specific value, call write:

cache.write("baz", 5)
cache.decrement("baz") # => 4
📝 Source code 
# File activesupport/lib/active_support/cache/file_store.rb, line 80
      def decrement(name, amount = 1, options = nil)
        options = merged_options(options)
        key = normalize_key(name, options)

        instrument(:decrement, key, amount: amount) do
          modify_value(name, -amount, options)
        end
      end
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delete_matched(matcher, options = nil)

📝 Source code 
# File activesupport/lib/active_support/cache/file_store.rb, line 89
      def delete_matched(matcher, options = nil)
        options = merged_options(options)
        matcher = key_matcher(matcher, options)

        instrument(:delete_matched, matcher.inspect) do
          search_dir(cache_path) do |path|
            key = file_path_key(path)
            delete_entry(path, **options) if key.match(matcher)
          end
        end
      end
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increment(name, amount = 1, options = nil)

Increment a cached integer value. Returns the updated value.

If the key is unset, it starts from 0:

cache.increment("foo") # => 1
cache.increment("bar", 100) # => 100

To set a specific value, call write:

cache.write("baz", 5)
cache.increment("baz") # => 6
📝 Source code 
# File activesupport/lib/active_support/cache/file_store.rb, line 60
      def increment(name, amount = 1, options = nil)
        options = merged_options(options)
        key = normalize_key(name, options)

        instrument(:increment, key, amount: amount) do
          modify_value(name, amount, options)
        end
      end
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