diff options
Diffstat (limited to 'activesupport/lib/active_support/cache.rb')
| -rw-r--r-- | activesupport/lib/active_support/cache.rb | 50 |
1 files changed, 26 insertions, 24 deletions
diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb index 10c457bb1d..85692428e3 100644 --- a/activesupport/lib/active_support/cache.rb +++ b/activesupport/lib/active_support/cache.rb @@ -116,31 +116,32 @@ module ActiveSupport # cache.read("city") # => "Duckburgh" # # Keys are always translated into Strings and are case sensitive. When an - # object is specified as a key, its +cache_key+ method will be called if it - # is defined. Otherwise, the +to_param+ method will be called. Hashes and - # Arrays can be used as keys. The elements will be delimited by slashes - # and Hashes elements will be sorted by key so they are consistent. + # object is specified as a key and has a +cache_key+ method defined, this + # method will be called to define the key. Otherwise, the +to_param+ + # method will be called. Hashes and Arrays can also be used as keys. The + # elements will be delimited by slashes, and the elements within a Hash + # will be sorted by key so they are consistent. # # cache.read("city") == cache.read(:city) # => true # # Nil values can be cached. # - # If your cache is on a shared infrastructure, you can define a namespace for - # your cache entries. If a namespace is defined, it will be prefixed on to every - # key. The namespace can be either a static value or a Proc. If it is a Proc, it - # will be invoked when each key is evaluated so that you can use application logic - # to invalidate keys. + # If your cache is on a shared infrastructure, you can define a namespace + # for your cache entries. If a namespace is defined, it will be prefixed on + # to every key. The namespace can be either a static value or a Proc. If it + # is a Proc, it will be invoked when each key is evaluated so that you can + # use application logic to invalidate keys. # # cache.namespace = lambda { @last_mod_time } # Set the namespace to a variable # @last_mod_time = Time.now # Invalidate the entire cache by changing namespace # # - # Caches can also store values in a compressed format to save space and reduce - # time spent sending data. Since there is some overhead, values must be large - # enough to warrant compression. To turn on compression either pass - # <tt>:compress => true</tt> in the initializer or to +fetch+ or +write+. - # To specify the threshold at which to compress values, set - # <tt>:compress_threshold</tt>. The default threshold is 32K. + # Caches can also store values in a compressed format to save space and + # reduce time spent sending data. Since there is overhead, values must be + # large enough to warrant compression. To turn on compression either pass + # <tt>:compress => true</tt> in the initializer or as an option to +fetch+ + # or +write+. To specify the threshold at which to compress values, set the + # <tt>:compress_threshold</tt> option. The default threshold is 32K. class Store cattr_accessor :logger, :instance_writer => true @@ -180,11 +181,11 @@ module ActiveSupport # Fetches data from the cache, using the given key. If there is data in # the cache with the given key, then that data is returned. # - # If there is no such data in the cache (a cache miss occurred), - # then nil will be returned. However, if a block has been passed, then - # that block will be run in the event of a cache miss. The return value - # of the block will be written to the cache under the given cache key, - # and that return value will be returned. + # If there is no such data in the cache (a cache miss), then nil will be + # returned. However, if a block has been passed, that block will be run + # in the event of a cache miss. The return value of the block will be + # written to the cache under the given cache key, and that return value + # will be returned. # # cache.write("today", "Monday") # cache.fetch("today") # => "Monday" @@ -205,10 +206,11 @@ module ActiveSupport # in a compressed format. # # - # Setting <tt>:expires_in</tt> will set an expiration time on the cache. All caches - # support auto expiring content after a specified number of seconds. This value can - # be specified as an option to the construction in which call all entries will be - # affected. Or it can be supplied to the +fetch+ or +write+ method for just one entry. + # Setting <tt>:expires_in</tt> will set an expiration time on the cache. + # All caches support auto-expiring content after a specified number of + # seconds. This value can be specified as an option to the constructor + # (in which case all entries will be affected), or it can be supplied to + # the +fetch+ or +write+ method to effect just one entry. # # cache = ActiveSupport::Cache::MemoryStore.new(:expires_in => 5.minutes) # cache.write(key, value, :expires_in => 1.minute) # Set a lower value for one entry |