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Dir["#{__dir__}/cache_stores/*.rb"].each {|file| require file }
module Geocoder
class Cache
def initialize(store, config)
@class = (Geocoder::CacheStore.const_get("#{store.class}", false) rescue Geocoder::CacheStore::Generic)
@store_service = @class.new(store, config)
end
##
# Read from the Cache.
#
def [](url)
interpret store_service.read(url)
rescue => e
Geocoder.log(:warn, "Geocoder cache read error: #{e}")
end
##
# Write to the Cache.
#
def []=(url, value)
store_service.write(url, value)
rescue => e
Geocoder.log(:warn, "Geocoder cache write error: #{e}")
end
##
# Delete cache entry for given URL,
# or pass <tt>:all</tt> to clear all URLs.
#
def expire(url)
if url == :all
if store_service.respond_to?(:keys)
urls.each{ |u| expire(u) }
else
raise(NoMethodError, "The Geocoder cache store must implement `#keys` for `expire(:all)` to work")
end
else
expire_single_url(url)
end
end
private # ----------------------------------------------------------------
def store_service; @store_service; end
##
# Array of keys with the currently configured prefix
# that have non-nil values.
#
def keys
store_service.keys
end
##
# Array of cached URLs.
#
def urls
store_service.urls
end
##
# Clean up value before returning. Namely, convert empty string to nil.
# (Some key/value stores return empty string instead of nil.)
#
def interpret(value)
value == "" ? nil : value
end
def expire_single_url(url)
store_service.remove(url)
end
end
end
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