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# This class implements a cache with simple delegation to the the Dalli Memcached client
# https://github.com/mperham/dalli
#
# A TTL is set on initialization
class AutoexpireCacheDalli
def initialize(store, ttl = 86400)
@store = store
@keys = 'GeocoderDalliClientKeys'
@ttl = ttl
end
def [](url)
res = @store.get(url)
res = YAML::load(res) if res.present?
res
end
def []=(url, value)
if value.nil?
del(url)
else
key_cache_add(url) if @store.add(url, YAML::dump(value), @ttl)
end
value
end
def keys
key_cache
end
def del(url)
key_cache_delete(url) if @store.delete(url)
end
private
def key_cache
the_keys = @store.get(@keys)
if the_keys.nil?
@store.add(@keys, YAML::dump([]))
[]
else
YAML::load(the_keys)
end
end
def key_cache_add(key)
@store.replace(@keys, YAML::dump(key_cache << key))
end
def key_cache_delete(key)
tmp = key_cache
tmp.delete(key)
@store.replace(@keys, YAML::dump(tmp))
end
end
# Here Dalli is set up as on Heroku using the Memcachier gem.
# https://devcenter.heroku.com/articles/memcachier#ruby
# On other setups you might have to specify your Memcached server in Dalli::Client.new
Geocoder.configure(:cache => AutoexpireCacheDalli.new(Dalli::Client.new))
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