Class: ActiveSupport::Cache::FileStore

Inherits:
Store show all
Includes:
Strategy::LocalCache
Defined in:
lib/active_support/cache/file_store.rb

Overview

A cache store implementation which stores everything on the filesystem.

FileStore implements the Strategy::LocalCache strategy which implements an in-memory cache inside of a block.

Constant Summary collapse

DIR_FORMATTER = 
"%03X"
FILENAME_MAX_SIZE =

max filename size on file system is 255, minus room for timestamp and random characters appended by Tempfile (used by atomic write)

228
FILEPATH_MAX_SIZE =

max is 1024, plus some room

900
EXCLUDED_DIRS = 
['.', '..'].freeze
GITKEEP_FILES = 
['.gitkeep', '.keep'].freeze

Instance Attribute Summary collapse

Attributes inherited from Store

#options, #silence

Instance Method Summary collapse

Methods included from Strategy::LocalCache

#middleware, #with_local_cache

Methods inherited from Store

#delete, #exist?, #fetch, #fetch_multi, #mute, #read, #read_multi, #silence!, #write

Constructor Details

#initialize(cache_path, options = nil) ⇒ FileStore

Returns a new instance of FileStore.



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# File 'lib/active_support/cache/file_store.rb', line 22

def initialize(cache_path, options = nil)
  super(options)
  @cache_path = cache_path.to_s
end

Instance Attribute Details

#cache_path ⇒ Object (readonly)

Returns the value of attribute cache_path.



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# File 'lib/active_support/cache/file_store.rb', line 14

def cache_path
  @cache_path
end

Instance Method Details

#cleanup(options = nil) ⇒ Object

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



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# File 'lib/active_support/cache/file_store.rb', line 37

def cleanup(options = nil)
  options = merged_options(options)
  search_dir(cache_path) do |fname|
    key = file_path_key(fname)
    entry = read_entry(key, options)
    delete_entry(key, options) if entry && entry.expired?
  end
end

#clear(options = nil) ⇒ Object

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.



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# File 'lib/active_support/cache/file_store.rb', line 30

def clear(options = nil)
  root_dirs = exclude_from(cache_path, EXCLUDED_DIRS + GITKEEP_FILES)
  FileUtils.rm_r(root_dirs.collect{|f| File.join(cache_path, f)})
rescue Errno::ENOENT
end

#decrement(name, amount = 1, options = nil) ⇒ Object

Decrements an already existing integer value that is stored in the cache. If the key is not found nothing is done.



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# File 'lib/active_support/cache/file_store.rb', line 54

def decrement(name, amount = 1, options = nil)
  modify_value(name, -amount, options)
end

#delete_matched(matcher, options = nil) ⇒ Object 



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# File 'lib/active_support/cache/file_store.rb', line 58

def delete_matched(matcher, options = nil)
  options = merged_options(options)
  instrument(:delete_matched, matcher.inspect) do
    matcher = key_matcher(matcher, options)
    search_dir(cache_path) do |path|
      key = file_path_key(path)
      delete_entry(path, options) if key.match(matcher)
    end
  end
end

#increment(name, amount = 1, options = nil) ⇒ Object

Increments an already existing integer value that is stored in the cache. If the key is not found nothing is done.



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# File 'lib/active_support/cache/file_store.rb', line 48

def increment(name, amount = 1, options = nil)
  modify_value(name, amount, options)
end