Class: Sinicum::Controllers::GlobalStateCache

Inherits:
Object
  • Object
show all
Defined in:
app/controllers/sinicum/controllers/global_state_cache.rb

Overview

Public: Filter to cache the result of a page if no changes in Magnolia occured.

Constant Summary collapse

DEPLOY_REVISION_FILE = 
"REVISION"
THREAD_LOCAL_VAR_NAME = 
"__sinicum_global_state_cache"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(controller) ⇒ GlobalStateCache

Returns a new instance of GlobalStateCache.



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# File 'app/controllers/sinicum/controllers/global_state_cache.rb', line 9

def initialize(controller)
  @controller = controller
  @global_jcr_cache_key = Sinicum::Jcr::Cache::GlobalCache.new.current_key
end

Class Method Details

.after(controller) ⇒ Object 



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# File 'app/controllers/sinicum/controllers/global_state_cache.rb', line 22

def self.after(controller)
  if do_cache?
    begin
      instance = Thread.current[THREAD_LOCAL_VAR_NAME]
      instance.cache_response if instance
    ensure
      Thread.current[THREAD_LOCAL_VAR_NAME] = nil
    end
  end
end

.before(controller) ⇒ Object 



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# File 'app/controllers/sinicum/controllers/global_state_cache.rb', line 14

def self.before(controller)
  if do_cache?
    instance = new(controller)
    Thread.current[THREAD_LOCAL_VAR_NAME] = instance
    instance.render_or_proceed
  end
end

Instance Method Details

#cache_response ⇒ Object 



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# File 'app/controllers/sinicum/controllers/global_state_cache.rb', line 45

def cache_response
  response = @controller.response
  if @controller.request.get? && response.cache_control[:public] &&
      response.cache_control[:max_age] && response.cache_control[:max_age] > 0
    cache_content = {
      body: response.body,
      cache_control: response.cache_control,
      status: response.status
    }
    Rails.cache.write(cache_key, cache_content)
  end
end

#render_or_proceed ⇒ Object 



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# File 'app/controllers/sinicum/controllers/global_state_cache.rb', line 33

def render_or_proceed
  cached = Rails.cache.fetch(cache_key)
  if cached
    @controller.response.cache_control.merge!(cached[:cache_control])
    @controller.response.status = cached[:status]
    @controller.response.headers["X-SCache"] = "true"
    @controller.render text: cached[:body]
  else
    @controller.response.headers["X-SCache"] = "false"
  end
end