class EOAT::Cache::MemcachedCache
Memcached cache handler. Used ‘gem memcache` Default use standard connection parameters. @author Ivan Kotov {i.s.kotov.ws e-mail} @example Set Memcached as a cache storage, with default Memcached `address` and `port`
EOAT.cache = EOAT::Cache::MemcachedCache.new
@example Set Redis as a cache storage, with connect to custom server:port and not set key prefix
EOAT.cache = EOAT::Cache::MemcachedCache.new('10.0.1.1:11212', '')
Public Class Methods
new(server='localhost:11211', prefix='eoat')
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@param [String] server the connection string ‘<ip-address>:<port>` @param [String] prefix the prefix for keys
# File lib/eoat/cache/memcached_cache.rb, line 15 def initialize(server='localhost:11211', prefix='eoat') require 'memcache' @backend = Memcache.new(:server => server, :namespace => prefix, :segment_large_values => true) end
Public Instance Methods
get(host, uri)
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Get object from cache @param [String] host the request host string @param [String] uri the query string @return [Object, NilClass] the instance of result class
or nil if key not does not exist
# File lib/eoat/cache/memcached_cache.rb, line 26 def get(host, uri) # Set key as md5 string key = EOAT::Cache.md5hash(host + uri) response = @backend.get(key) if response if EOAT::Cache.md5hash(response) == @backend.get(key + '_hash') return YAML::load(response) else @backend.delete(key) @backend.delete(key + '_hash') end end false end
save(host, uri, content)
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Save instance of result class. @param [String] host the request host string @param [String] uri the query string @param [Object] content the result class instance
# File lib/eoat/cache/memcached_cache.rb, line 45 def save(host, uri, content) # Calculate TTL in seconds expire = (content.cached_until - content.request_time).to_i # If TTL > EOAT.max_ttl set EOAT.max_tt as expire expire = expire > EOAT.max_ttl ? EOAT.max_ttl : expire # If 0 or a negative value, it does not save. if expire > 0 # Set key as md5 string key = EOAT::Cache.md5hash(host + uri) yaml = content.to_yaml @backend.set( key, yaml, :expiry => expire ) @backend.set( key + '_hash', EOAT::Cache.md5hash(yaml), :expiry => expire ) end end