/usr/lib/ruby/vendor_ruby/active_support/cache/strategy/local_cache.rb is in ruby-activesupport-2.3 2.3.14-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 98 99 100 101 102 103 104 | module ActiveSupport
module Cache
module Strategy
module LocalCache
# this allows caching of the fact that there is nothing in the remote cache
NULL = 'remote_cache_store:null'
def with_local_cache
Thread.current[thread_local_key] = MemoryStore.new
yield
ensure
Thread.current[thread_local_key] = nil
end
def middleware
@middleware ||= begin
klass = Class.new
klass.class_eval(<<-EOS, __FILE__, __LINE__ + 1)
def initialize(app)
@app = app
end
def call(env)
Thread.current[:#{thread_local_key}] = MemoryStore.new
@app.call(env)
ensure
Thread.current[:#{thread_local_key}] = nil
end
EOS
klass
end
end
def read(key, options = nil)
value = local_cache && local_cache.read(key)
if value == NULL
nil
elsif value.nil?
value = super
local_cache.mute { local_cache.write(key, value || NULL) } if local_cache
value.duplicable? ? value.dup : value
else
# forcing the value to be immutable
value.duplicable? ? value.dup : value
end
end
def write(key, value, options = nil)
value = value.to_s if respond_to?(:raw?) && raw?(options)
local_cache.mute { local_cache.write(key, value || NULL) } if local_cache
super
end
def delete(key, options = nil)
local_cache.mute { local_cache.write(key, NULL) } if local_cache
super
end
def exist(key, options = nil)
value = local_cache.read(key) if local_cache
if value == NULL
false
elsif value
true
else
super
end
end
def increment(key, amount = 1)
if value = super
local_cache.mute { local_cache.write(key, value.to_s) } if local_cache
value
else
nil
end
end
def decrement(key, amount = 1)
if value = super
local_cache.mute { local_cache.write(key, value.to_s) } if local_cache
value
else
nil
end
end
def clear
local_cache.clear if local_cache
super
end
private
def thread_local_key
@thread_local_key ||= "#{self.class.name.underscore}_local_cache".gsub("/", "_").to_sym
end
def local_cache
Thread.current[thread_local_key]
end
end
end
end
end
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