class ActiveRecord::Base def cache_key case in Java

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class ActiveRecord::Base def cache_key case
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when new "#{selfclassmodel_namecache_key}/new" when timestamp = self[:updated_at]
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"#{selfclassmodel_namecache_key}/#{id}-#{timestampto_s(:number)}" else "#{selfclassmodel_namecache_key}/#{id}" end end end
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1722 Initializing New Caches
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We can also initialize a new cache directly, or through ActiveSupport::Cache
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lookup_store if we want to cache other objects in the application and not just the
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views Either one of these methods of creating a new cache takes the same expiration and compression options as mentioned previously, and the same three stores exist as for fragment caching: FileStore, MemoryStore, and MemCacheStore
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ActiveSupport::Cache::MemCacheStorenew( :expire_in => 5seconds ) ActiveSupport::Cachelookup_store( :mem_cache_store, :compress => true )
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Once you have your cache object, you can read and write to it via its very simple API and any Ruby object that can be serialized can be cached, including nils
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cache = ActiveSupport::Cache::MemoryStorenew cachewrite(:name, "John Doe") cachefetch(:name) # => "John Doe"
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1723 fetch Options
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There are several options that can be passed to fetch in order to provide different types of behavior for each of the different stores Additional options than those listed here are available based on the individual cache implementations
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:compress Use compression for this request :expire_in Tell an individual key in the cache to expire in n seconds :force If set to true will force the cache to delete the supplied key
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173 Control Web Caching
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:race_condition_ttl Supply seconds as an integer and a block When an item
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in the cache is expired for less than the number of seconds, its time gets updated and its value is set to the result of the block There are other available functions on caches, and options can be passed for the specific cache store implementation
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delete(name, options) Delete a value for the key exist (name, options) Will return true if a value exists for the provided key read(name, options) Get a value for the supplied key or return nil if none found read_multi(*names) Return the values for the supplied keys as a hash of key/value
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pairs
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write(name, value, options) Write a value to the cache
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Caching
173 Control Web Caching
Action Controller offers a pair of methods for easily setting HTTP 11 Cache-Control headers Their default behavior is to issue a private instruction, so that intermediate caches (web proxies) must not cache the response In this context, private only controls where the response may be cached and not the privacy of the message content The public setting indicates that the response may be cached by any cache or proxy and should never be used in conjunction with data served up for a particular end user Using curl --head we can examine the way that these methods affect HTTP responses For reference, let s examine the output of a normal index action
$ curl --head localhost:3000/reports HTTP/11 200 OK Etag: "070a386229cd857a15b2f5cb2089b987" Connection: Keep-Alive Content-Type: text/html; charset=utf-8 Date: Wed, 15 Sep 2010 04:01:30 GMT Server: WEBrick/131 (Ruby/187/2009-06-12) X-Runtime: 0032448 Content-Length: 0 Cache-Control: max-age=0, private, must-revalidate Set-Cookie: 124cc92; path=/; HttpOnly
Don t get confused by the content length being zero That s only because curl -head issues a HEAD request If you re experimenting with your own Rails app, try curl -v localhost:3000 to see all the HTTP headers plus the body content
17: Caching and Performance
1731 expires in(seconds, options = {})
This method will overwrite an existing Cache-Control header4 Examples include
expires_in 20minutes expires_in 3hours, :public => true expires in 3hours, 'max-stale' => 5hours, :public => true
Setting expiration to 20 minutes alters our reference output as follows:
Cache-Control: max-age=1200, private
1732 expires now
Sets a HTTP 11 Cache-Control header of the response to no-cache informing web proxies and browsers that they should not cache the response for subsequent requests
174 ETags
The bulk of this chapter deals with caching content so that the server does less work than it would have to do otherwise, but still incurs the cost of transporting page data to the browser The ETags scheme, where E stands for entity, allows you to avoid sending any content to the browser at all if nothing has changed on the server since the last time a particular resource was requested A properly implemented ETags scheme is one of the most significant performance improvements that can be implemented on a high traffic website5 Rendering automatically inserts the Etag header on 200 OK responses, calculated as an MD5 hash of the response body If a subsequent request comes in that has a matching Etag6 , the response will be changed to a 304 Not Modified and the response body will be set to an empty string The key to performance gains is to short circuit the controller action and prevent rendering if you know that the resulting Etag is going to be the same as the one associated with the current request I believe you re actually being a good Internet citizen by paying attention to proper use of ETags in your application According to RFC 2616,7 the preferred behavior for an HTTP/11 origin server is to send both a strong entity tag and a Last-Modified value
4 See http://http://wwww3org/Protocols/rfc2616/rfc2616-sec14html#sec149 for more information 5 Tim Bray wrote one of my favorite blog posts on the topic at http://wwwtbrayorg/ongoing/ When/200x/2008/08/14/Rails-ETags 6 http://wwww3org/Protocols/rfc2616/rfc2616-sec14html#sec1419 7 http://wwww3org/Protocols/rfc2616/rfc2616-sec13html#sec1334