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patternrubyrailsMinor

Object cache storage for Rails

Submitted by: @import:stackexchange-codereview··
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storagerailscacheforobject

Problem

I want to have fast cache in which I want to keep all my nomenclature data.
I don't want to go with Memcached because I have to do serialize/de-serialize on each object which is slow.

So I choose to be less effective in memory and keep the cache in each server instance.
I am sure I am doing it in the wrong way because the NoCache module - which skips my cache and hits the Rails cache is faster than mine.

Here is how it is initialized

$cache = Cache.new


Here is the example usage

property_types = $cache['PropertyType']


and here is the source

```
module DirectCache
def init_cache
end

def reload_model(model_class)
key = get_key(model_class)
klass = key.constantize
object = klass.scoped
puts "Loading cache for #{key}..."
if klass.respond_to?(:translates) and klass.translates?
puts " Adding translation in the model for #{klass}"
object = object.includes(:translations)
self.storage[key] = object.send("all")
end
end

def [] class_name_or_object
puts "Hiting cache for #{class_name_or_object}"
key = get_key(class_name_or_object)
reload_model(class_name_or_object) if self.storage[key].blank? or self.storage[key].empty?
raise "#{key} is missing in the cache #{@cache.keys.join ', '}" unless key? key
self.storage[key]
end

def init_cache
end

end

module NoCache
def reload_model(model_class)
key = get_key(model_class)
self.storage[key] = key.constantize
end

def [] class_name_or_object
key = get_key(class_name_or_object)
raise "#{key} is missing in the cache #{@cache.keys.join ', '}" unless key? key
klass = self.storage[key]
object = klass.scoped
if klass.respond_to?(:translates) and klass.translates?
puts "Adding translation in the model for #{klass}"
object = object.includes(:translations)
end
object.send("all")
end

def init_cache
end

end

class Cache
include DirectCache
# include NoCache
# include OpenStruc

Solution

The ActiveSupport::Cache is not mandatory in Memcached, there are a cache in memory if you use the :memory_store ( http://api.rubyonrails.org/classes/ActiveSupport/Cache/MemoryStore.html )

config.cache_store = :memory_store

Maybe can be a good start to implement your own Cache in memory

Context

StackExchange Code Review Q#147, answer score: 3

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