JezK
Edit File: memcache_util.rb
## # A utility wrapper around the MemCache client to simplify cache access. All # methods silently ignore MemCache errors. # # This API is deprecated, please use the Rails.cache API or your own wrapper API # around MemCache. module Cache ## # Try to return a logger object that does not rely # on ActiveRecord for logging. def self.logger @logger ||= if defined? Rails.logger # Rails 2.1 + Rails.logger elsif defined? RAILS_DEFAULT_LOGGER # Rails 1.2.2 + RAILS_DEFAULT_LOGGER else ActiveRecord::Base.logger # ... very old Rails. end end ## # Returns the object at +key+ from the cache if successful, or nil if either # the object is not in the cache or if there was an error attermpting to # access the cache. # # If there is a cache miss and a block is given the result of the block will # be stored in the cache with optional +expiry+, using the +add+ method rather # than +set+. def self.get(key, expiry = 0) start_time = Time.now value = CACHE.get key elapsed = Time.now - start_time logger.debug('MemCache Get (%0.6f) %s' % [elapsed, key]) if value.nil? and block_given? then value = yield add key, value, expiry end value rescue MemCache::MemCacheError => err logger.debug "MemCache Error: #{err.message}" if block_given? then value = yield put key, value, expiry end value end ## # Sets +value+ in the cache at +key+, with an optional +expiry+ time in # seconds. def self.put(key, value, expiry = 0) start_time = Time.now CACHE.set key, value, expiry elapsed = Time.now - start_time logger.debug('MemCache Set (%0.6f) %s' % [elapsed, key]) value rescue MemCache::MemCacheError => err ActiveRecord::Base.logger.debug "MemCache Error: #{err.message}" nil end ## # Sets +value+ in the cache at +key+, with an optional +expiry+ time in # seconds. If +key+ already exists in cache, returns nil. def self.add(key, value, expiry = 0) start_time = Time.now response = CACHE.add key, value, expiry elapsed = Time.now - start_time logger.debug('MemCache Add (%0.6f) %s' % [elapsed, key]) (response == "STORED\r\n") ? value : nil rescue MemCache::MemCacheError => err ActiveRecord::Base.logger.debug "MemCache Error: #{err.message}" nil end ## # Deletes +key+ from the cache in +delay+ seconds. def self.delete(key, delay = nil) start_time = Time.now CACHE.delete key, delay elapsed = Time.now - start_time logger.debug('MemCache Delete (%0.6f) %s' % [elapsed, key]) nil rescue MemCache::MemCacheError => err logger.debug "MemCache Error: #{err.message}" nil end ## # Resets all connections to MemCache servers. def self.reset CACHE.reset logger.debug 'MemCache Connections Reset' nil end end