1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
module ActionController #:nodoc:
module Caching
# Fragment caching is used for caching various blocks within
# views without caching the entire action as a whole. This is
# useful when certain elements of an action change frequently or
# depend on complicated state while other parts rarely change or
# can be shared amongst multiple parties. The caching is done using
# the <tt>cache</tt> helper available in the Action View. See
# ActionView::Helpers::CacheHelper for more information.
#
# While it's strongly recommended that you use key-based cache
# expiration (see links in CacheHelper for more information),
# it is also possible to manually expire caches. For example:
#
# expire_fragment("name_of_cache")
module Fragments
# Given a key (as described in <tt>expire_fragment</tt>), returns
# a key suitable for use in reading, writing, or expiring a
# cached fragment. All keys are prefixed with <tt>views/</tt> and uses
# ActiveSupport::Cache.expand_cache_key for the expansion.
def fragment_cache_key(key)
ActiveSupport::Cache.expand_cache_key(key.is_a?(Hash) ? url_for(key).split("://").last : key, :views)
end
# Writes <tt>content</tt> to the location signified by
# <tt>key</tt> (see <tt>expire_fragment</tt> for acceptable formats).
def write_fragment(key, content, options = nil)
return content unless cache_configured?
key = fragment_cache_key(key)
instrument_fragment_cache :write_fragment, key do
content = content.to_str
cache_store.write(key, content, options)
end
content
end
# Reads a cached fragment from the location signified by <tt>key</tt>
# (see <tt>expire_fragment</tt> for acceptable formats).
def read_fragment(key, options = nil)
return unless cache_configured?
key = fragment_cache_key(key)
instrument_fragment_cache :read_fragment, key do
result = cache_store.read(key, options)
result.respond_to?(:html_safe) ? result.html_safe : result
end
end
# Check if a cached fragment from the location signified by
# <tt>key</tt> exists (see <tt>expire_fragment</tt> for acceptable formats)
def fragment_exist?(key, options = nil)
return unless cache_configured?
key = fragment_cache_key(key)
instrument_fragment_cache :exist_fragment?, key do
cache_store.exist?(key, options)
end
end
# Removes fragments from the cache.
#
# +key+ can take one of three forms:
#
# * String - This would normally take the form of a path, like
# <tt>pages/45/notes</tt>.
# * Hash - Treated as an implicit call to +url_for+, like
# <tt>{:controller => "pages", :action => "notes", :id => 45}</tt>
# * Regexp - Will remove any fragment that matches, so
# <tt>%r{pages/\d*/notes}</tt> might remove all notes. Make sure you
# don't use anchors in the regex (<tt>^</tt> or <tt>$</tt>) because
# the actual filename matched looks like
# <tt>./cache/filename/path.cache</tt>. Note: Regexp expiration is
# only supported on caches that can iterate over all keys (unlike
# memcached).
#
# +options+ is passed through to the cache store's <tt>delete</tt>
# method (or <tt>delete_matched</tt>, for Regexp keys.)
def expire_fragment(key, options = nil)
return unless cache_configured?
key = fragment_cache_key(key) unless key.is_a?(Regexp)
instrument_fragment_cache :expire_fragment, key do
if key.is_a?(Regexp)
cache_store.delete_matched(key, options)
else
cache_store.delete(key, options)
end
end
end
def instrument_fragment_cache(name, key)
ActiveSupport::Notifications.instrument("#{name}.action_controller", :key => key){ yield }
end
end
end
end
|
