Action Caching in Java

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1713 Action Caching
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By definition, if there s anything that has to change on every request or specific to an end user s view of that page, page caching is not an option On the other hand, if all we need to do is run some filters that check conditions before displaying the page requested, the caches_action method will work It s almost like page caching, except that controller filters are executed prior to serving the cached HTML file That gives you the option to do some extra processing or even redirect if necessary Action caching is implemented with fragment caching (covered later in this chapter) and an around_filter (covered in 4, Working with Controllers) The cached action content is keyed based on the current host and the path, which means that it will still work even with Rails applications serving multiple subdomains using a DNS wildcard Also, different representations of the same resource, such as HTML and XML, are treated like separate requests and cached separately Listing 171 (like most of the listings in this chapter) is taken from a blog application with public and private entries, so for default requests, we should run a filter that figures out whether the visitor is logged in and redirects them to the public action if necessary
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1 In his great screencast on the subject, Geoffrey Grosenbach suggests adding another environment mode to your project named development with caching, with caching turned on just for experimentation (http://peepcodecom/products/page-action-and-fragment-caching)
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171 View Caching
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Listing 171 The EntriesController of lil journal class EntriesController < ApplicationController before_filter :check_logged_in, :only => [:index] caches_page :public caches_action :index def public @entries = Entrywhere(:private => false)limit(10) render :index end def index @entries = Entrylimit(10) end private
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Caching
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def check_logged_in redirect_to :action => 'public' unless logged_in end end
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The public action displays only the public entries and is visible to anyone, which makes it a candidate for page caching However, since it doesn t require its own template, we just call render :index explicitly at the end of the public action
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Design Considerations Knowing that your application will eventually require caching should influence your design decisions Projects with optional authentication often have controller actions that are impossible to page or action-cache, because they handle both login states internally That would have been the case in Listing 171 if we had written the index action to handle both public and private display:
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def index @entries = Entrylimit(10) @entries = @entrieswhere(:private => false) unless logged_in end
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Most of the time, you won t have too many pages with completely static content that can be cached using cache_page or cache_action, and that s where fragment caching comes into play
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17: Caching and Performance
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1714 Fragment Caching
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Users are accustomed to all sorts of dynamic content on the page, and your application layout will be filled with things like welcome messages and notification counts Fragment caching allows us to capture parts of the rendered page on disk and serve them up on subsequent requests without needing to render their content again The performance improvement is not as dramatic as with page or action caching, since the Rails dispatcher is still involved
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The cache Method Fragment caching is by its very nature something that you specify in your view template rather than at the controller level You do so using the cache method of Action View It takes a block, which lets you wrap content that should be cached Once we log in to the sample application reflected in Listing 171, the header section should really display information about the logged-in user, so action-caching the index page is out of the question We ll remove the caches_action directive from the EntriesController, but leave cache_page in place for the public action Then we ll go into the entries/indexhtmlhaml template and add fragment caching, as shown in Listing 172
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Listing 172 entries/indexhtmlhaml template with fragment caching = content_tag :h1, "#{@username}'s Journal" - cache do = render :partial => 'entry', :collection => @entries
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Easy as that the HTML output of rendering the collection of entries is stored in the fragment cache associated with the entries/index page That s fine if we re only caching one fragment of the page, but most of the time we ll need to give the fragment some extra identification
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Named Fragments The cache method takes an optional name parameter If you leave it blank, as we have in Listing 172, it caches its content keyed to the URL of its parent page That s an acceptable solution as long as there is only one fragment on the page If we re caching more than one fragment on the page, we need to add an extra identifier, so that we don t suffer name collisions Listing 173 is an enhanced version of the entries page, where we ve added the display of recent comments in the sidebar
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