123456789_123456789_123456789_123456789_123456789_

Class: ActiveSupport::Cache::MemCacheStore

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Store
Instance Chain:
Inherits: ActiveSupport::Cache::Store
Defined in: activesupport/lib/active_support/cache/mem_cache_store.rb

Overview

A cache store implementation which stores data in Memcached: memcached.org

This is currently the most popular cache store for production websites.

Special features:

  • Clustering and load balancing. One can specify multiple memcached servers, and MemCacheStore will load balance between all available servers. If a server goes down, then MemCacheStore will ignore it until it comes back up.

MemCacheStore implements the Strategy::LocalCache strategy which implements an in-memory cache inside of a block.

Constant Summary

Class Attribute Summary

Store - Inherited

Class Method Summary

Store - Inherited

.new

Creates a new cache.

Instance Attribute Summary

Store - Inherited

Instance Method Summary

Strategy::LocalCache - Included

#middleware

Middleware class can be inserted as a ::Rack handler to be local cache for the duration of request.

#with_local_cache

Use a local cache for the duration of block.

Store - Inherited

#cleanup

Cleanups the cache by removing expired entries.

#clear

Clears the entire cache.

#decrement

Decrements an integer value in the cache.

#delete

Deletes an entry in the cache.

#delete_matched

Deletes all entries with keys matching the pattern.

#exist?

Returns true if the cache contains an entry for the given key.

#fetch

Fetches data from the cache, using the given key.

#fetch_multi

Fetches data from the cache, using the given keys.

#increment

Increments an integer value in the cache.

#mute

Silences the logger within a block.

#read

Reads data from the cache, using the given key.

#read_multi

Reads multiple values at once from the cache.

#silence,
#silence!

Silences the logger.

#write

Writes the value to the cache, with the key.

#write_multi

::ActiveSupport::Cache Storage API to write multiple values at once.

#key_matcher

Adds the namespace defined in the options to a pattern designed to match keys.

Constructor Details

.new(*addresses) ⇒ MemCacheStore

Creates a new MemCacheStore object, with the given memcached server addresses. Each address is either a host name, or a host-with-port string in the form of “host_name:port”. For example:

ActiveSupport::Cache::MemCacheStore.new("localhost", "server-downstairs.localnetwork:8229")

If no addresses are specified, then MemCacheStore will connect to localhost port 11211 (the default memcached port).

[ GitHub ]

  
# File 'activesupport/lib/active_support/cache/mem_cache_store.rb', line 76

def initialize(*addresses)
  addresses = addresses.flatten
  options = addresses.extract_options!
  super(options)

  unless [String, Dalli::Client, NilClass].include?(addresses.first.class)
    raise ArgumentError, "First argument must be an empty array, an array of hosts or a Dalli::Client instance."
  end
  if addresses.first.is_a?(Dalli::Client)
    @data = addresses.first
  else
    mem_cache_options = options.dup
    UNIVERSAL_OPTIONS.each { |name| mem_cache_options.delete(name) }
    @data = self.class.build_mem_cache(*(addresses + [mem_cache_options]))
  end
end

Instance Method Details

#clear(options = nil)

Clear the entire cache on all memcached servers. This method should be used with care when shared cache is being used.

[ GitHub ]

  
# File 'activesupport/lib/active_support/cache/mem_cache_store.rb', line 121

def clear(options = nil)
  rescue_error_with(nil) { @data.with { |c| c.flush_all } }
end

#decrement(name, amount = 1, options = nil)

Decrement a cached value. This method uses the memcached decr atomic operator and can only be used on values written with the :raw option. Calling it on a value not stored with :raw will initialize that value to zero.

[ GitHub ]

  
# File 'activesupport/lib/active_support/cache/mem_cache_store.rb', line 110

def decrement(name, amount = 1, options = nil)
  options = merged_options(options)
  instrument(:decrement, name, amount: amount) do
    rescue_error_with nil do
      @data.with { |c| c.decr(normalize_key(name, options), amount, options[:expires_in]) }
    end
  end
end

#increment(name, amount = 1, options = nil)

Increment a cached value. This method uses the memcached incr atomic operator and can only be used on values written with the :raw option. Calling it on a value not stored with :raw will initialize that value to zero.

[ GitHub ]

  
# File 'activesupport/lib/active_support/cache/mem_cache_store.rb', line 97

def increment(name, amount = 1, options = nil)
  options = merged_options(options)
  instrument(:increment, name, amount: amount) do
    rescue_error_with nil do
      @data.with { |c| c.incr(normalize_key(name, options), amount, options[:expires_in]) }
    end
  end
end

#stats

Get the statistics from the memcached servers.

[ GitHub ]

  
# File 'activesupport/lib/active_support/cache/mem_cache_store.rb', line 126

def stats
  @data.with { |c| c.stats }
end