Class: Rack::Cache::MetaStore::MemCached

Inherits:
MemCacheBase show all
Defined in:
lib/rack/cache/meta_store.rb

Constant Summary

Constants inherited from Rack::Cache::MetaStore

DISK, FILE, GAE, GAECACHE, HEAP, MEM, MEMCACHE, MEMCACHED

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from MemCacheBase

resolve

Methods inherited from Rack::Cache::MetaStore

#cache_key, #invalidate, #lookup, #store

Constructor Details

#initialize(server = "localhost:11211", options = {}) ⇒ MemCached

Returns a new instance of MemCached.



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# File 'lib/rack/cache/meta_store.rb', line 367

def initialize(server="localhost:11211", options={})
  options[:prefix_key] ||= options.delete(:namespace) if options.key?(:namespace)
  @cache =
    if server.respond_to?(:stats)
      server
    else
      require 'memcached'
      Memcached.new(server, options)
    end
end

Instance Attribute Details

#cache ⇒ Object (readonly)

The Memcached instance used to communicated with the memcached daemon.



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# File 'lib/rack/cache/meta_store.rb', line 365

def cache
  @cache
end

Instance Method Details

#purge(key) ⇒ Object 



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# File 'lib/rack/cache/meta_store.rb', line 391

def purge(key)
  key = hexdigest(key)
  cache.delete(key)
  nil
rescue Memcached::NotFound
  nil
end

#read(key) ⇒ Object 



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# File 'lib/rack/cache/meta_store.rb', line 378

def read(key)
  key = hexdigest(key)
  cache.get(key)
rescue Memcached::NotFound
  []
end

#write(key, entries, ttl = 0) ⇒ Object

Default TTL to zero, interpreted as “don’t expire” by Memcached.



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# File 'lib/rack/cache/meta_store.rb', line 386

def write(key, entries, ttl = 0)
  key = hexdigest(key)
  cache.set(key, entries, ttl)
end