class Rack::Cache::Storage

Maintains a collection of MetaStore and EntityStore instances keyed by URI. A single instance of this class can be used across a single process to ensure that only a single instance of a backing store is created per unique storage URI.

Public Class Methods

instance() click to toggle source
# File lib/rack/cache/storage.rb, line 60
def self.instance
  @@singleton_instance
end
new() click to toggle source
# File lib/rack/cache/storage.rb, line 12
def initialize
  @metastores = {}
  @entitystores = {}
end

Public Instance Methods

clear() click to toggle source
# File lib/rack/cache/storage.rb, line 25
def clear
  @metastores.clear
  @entitystores.clear
  nil
end
resolve_entitystore_uri(uri, options = {}) click to toggle source
# File lib/rack/cache/storage.rb, line 21
def resolve_entitystore_uri(uri, options = {})
  @entitystores[uri.to_s] ||= create_store(EntityStore, uri, options)
end
resolve_metastore_uri(uri, options = {}) click to toggle source
# File lib/rack/cache/storage.rb, line 17
def resolve_metastore_uri(uri, options = {})
  @metastores[uri.to_s] ||= create_store(MetaStore, uri, options)
end

Private Instance Methods

create_store(type, uri, options = {}) click to toggle source
# File lib/rack/cache/storage.rb, line 33
def create_store(type, uri, options = {})
  if uri.respond_to?(:scheme) || uri.respond_to?(:to_str)
    uri = URI.parse(uri) unless uri.respond_to?(:scheme)
    if type.const_defined?(uri.scheme.upcase)
      klass = type.const_get(uri.scheme.upcase)
      return klass.resolve(uri) if klass.method(:resolve).arity == 1
      klass.resolve(uri, options)
    else
      fail "Unknown storage provider: #{uri.to_s}"
    end
  else
    # hack in support for passing a Dalli::Client or Memcached object
    # as the storage URI.
    case
    when defined?(::Dalli) && uri.kind_of?(::Dalli::Client)
      type.const_get(:Dalli).resolve(uri)
    when defined?(::Memcached) && uri.respond_to?(:stats)
      type.const_get(:MemCached).resolve(uri)
    else
      fail "Unknown storage provider: #{uri.to_s}"
    end
  end
end