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|
# frozen_string_literal: true
require "active_support/core_ext/string/inflections"
require "active_support/per_thread_registry"
module ActiveSupport
module Cache
module Strategy
# Caches that implement LocalCache will be backed by an in-memory cache for the
# duration of a block. Repeated calls to the cache for the same key will hit the
# in-memory cache for faster access.
module LocalCache
autoload :Middleware, "active_support/cache/strategy/local_cache_middleware"
# Class for storing and registering the local caches.
class LocalCacheRegistry # :nodoc:
extend ActiveSupport::PerThreadRegistry
def initialize
@registry = {}
end
def cache_for(local_cache_key)
@registry[local_cache_key]
end
def set_cache_for(local_cache_key, value)
@registry[local_cache_key] = value
end
def self.set_cache_for(l, v); instance.set_cache_for l, v; end
def self.cache_for(l); instance.cache_for l; end
end
# Simple memory backed cache. This cache is not thread safe and is intended only
# for serving as a temporary memory cache for a single thread.
class LocalStore < Store
def initialize
super
@data = {}
end
# Don't allow synchronizing since it isn't thread safe.
def synchronize # :nodoc:
yield
end
def clear(options = nil)
@data.clear
end
def read_entry(key, options)
@data[key]
end
def read_multi_entries(keys, options)
values = {}
keys.each do |name|
entry = read_entry(name, options)
values[name] = entry.value if entry
end
values
end
def write_entry(key, value, options)
@data[key] = value
true
end
def delete_entry(key, options)
!!@data.delete(key)
end
def fetch_entry(key, options = nil) # :nodoc:
entry = @data.fetch(key) { @data[key] = yield }
dup_entry = entry.dup
dup_entry&.dup_value!
dup_entry
end
end
# Use a local cache for the duration of block.
def with_local_cache
use_temporary_local_cache(LocalStore.new) { yield }
end
# Middleware class can be inserted as a Rack handler to be local cache for the
# duration of request.
def middleware
@middleware ||= Middleware.new(
"ActiveSupport::Cache::Strategy::LocalCache",
local_cache_key)
end
def clear(options = nil) # :nodoc:
return super unless cache = local_cache
cache.clear(options)
super
end
def cleanup(options = nil) # :nodoc:
return super unless cache = local_cache
cache.clear
super
end
def increment(name, amount = 1, options = nil) # :nodoc:
return super unless local_cache
value = bypass_local_cache { super }
write_cache_value(name, value, options)
value
end
def decrement(name, amount = 1, options = nil) # :nodoc:
return super unless local_cache
value = bypass_local_cache { super }
write_cache_value(name, value, options)
value
end
private
def read_entry(key, options)
if cache = local_cache
cache.fetch_entry(key) { super }
else
super
end
end
def read_multi_entries(keys, options)
return super unless local_cache
local_entries = local_cache.read_multi_entries(keys, options)
missed_keys = keys - local_entries.keys
if missed_keys.any?
local_entries.merge!(super(missed_keys, options))
else
local_entries
end
end
def write_entry(key, entry, options)
if options[:unless_exist]
local_cache.delete_entry(key, options) if local_cache
else
local_cache.write_entry(key, entry, options) if local_cache
end
super
end
def delete_entry(key, options)
local_cache.delete_entry(key, options) if local_cache
super
end
def write_cache_value(name, value, options)
name = normalize_key(name, options)
cache = local_cache
cache.mute do
if value
cache.write(name, value, options)
else
cache.delete(name, options)
end
end
end
def local_cache_key
@local_cache_key ||= "#{self.class.name.underscore}_local_cache_#{object_id}".gsub(/[\/-]/, "_").to_sym
end
def local_cache
LocalCacheRegistry.cache_for(local_cache_key)
end
def bypass_local_cache
use_temporary_local_cache(nil) { yield }
end
def use_temporary_local_cache(temporary_cache)
save_cache = LocalCacheRegistry.cache_for(local_cache_key)
begin
LocalCacheRegistry.set_cache_for(local_cache_key, temporary_cache)
yield
ensure
LocalCacheRegistry.set_cache_for(local_cache_key, save_cache)
end
end
end
end
end
end
|
