Class: ActiveRecord::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/query_memcached.rb

Class Method Summary collapse

Class Method Details

.cache_version_key(table_name = nil) ⇒ Object 



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# File 'lib/query_memcached.rb', line 41

def cache_version_key(table_name = nil)
  "#{global_cache_version_key}/#{table_name || self.table_name}"
end

.connection_with_memcache_query_cache ⇒ Object 



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# File 'lib/query_memcached.rb', line 33

def connection_with_memcache_query_cache
  conn = connection_without_memcache_query_cache
  conn.memcache_query_cache_options = self.enableMemcacheQueryForModels[self.to_s]
  conn
end

.enable_memcache_querycache(options = {}) ⇒ Object

put this class method at the top of your AR model to enable memcache for the queryCache, otherwise it will use standard query cache



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# File 'lib/query_memcached.rb', line 23

def enable_memcache_querycache(options = {})
  if ActionController::Base.perform_caching && defined?(::Rails.cache) && ::Rails.cache.is_a?(ActiveSupport::Cache::MemCacheStore)
    options[:expires_in] ||= 90.minutes
    self.enableMemcacheQueryForModels[ActiveRecord::Base.send(:class_name_of_active_record_descendant, self).to_s] = options
  else
    warning = "[Query memcached WARNING] Disabled for #{ActiveRecord::Base.send(:class_name_of_active_record_descendant, self)} -- Memcache for QueryCache is not enabled for this model because caching is not turned on, Rails.cache is not defined, or cache engine is not mem_cache_store"
    ActiveRecord::Base.logger.error warning
  end
end

.extract_table_names(sql) ⇒ Object

Given a sql query this method extract all the table names of the database affected by the query thanks to the regular expression we have generated on the load of the plugin



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# File 'lib/query_memcached.rb', line 59

def extract_table_names(sql)
  sql.gsub(/`/,'').scan(self.table_names).map {|t| t.strip}.uniq
end

.global_cache_version_key ⇒ Object 



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# File 'lib/query_memcached.rb', line 45

def global_cache_version_key; 'version' end

.increase_version!(table_name = nil) ⇒ Object

Increment the class version key number



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# File 'lib/query_memcached.rb', line 48

def increase_version!(table_name = nil)
  key = cache_version_key(table_name)
  if r = ::Rails.cache.read(key)
    ::Rails.cache.write(key, r.to_i + 1)
  else
    ::Rails.cache.write(key, 1)
  end
end