Module: Ramaze::Helper::Cache

Defined in:
lib/ramaze/helper/cache.rb

Overview

Caching of simple objects and whole action responses.

Defined Under Namespace

Modules: SingletonMethods

Class Method Summary (collapse)

Instance Method Summary (collapse)

Class Method Details

+ (Object) included(into)

Setup needed traits, add the singleton methods and add the caches used by this helper.

Parameters:

  • into (Class) —

    Class that this Module is included into

Author:

  • manveru



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# File 'lib/ramaze/helper/cache.rb', line 16

def self.included(into)
  into.extend(SingletonMethods)
  into.add_action_wrapper(6.0, :cache_wrap)
  into.trait[:cache_action] ||= Set.new
  Ramaze::Cache.add(:action, :cache_helper_value)
end

Instance Method Details

- (Object) cache_value(key = nil, options = {})

This method is used to access Ramaze::Cache.cache_helper_value. It provides an easy way to cache long-running computations, gathering external resources like RSS feeds or DB queries that are the same for every user of an application. This method changes behaviour if a block is passed, which can be used to do lazy computation of the cached value conveniently when using a custom TTL or longer expressions that don't fit on one line with ||=.

Examples:

to get the cache object directly


count = cache_value[:count] ||= Article.count

with block


count = cache_value(:count){ Article.count }
count = cache_value(:count, :ttl => 60){ Article.count }

Returns:

  • (Object) —

    The cache wrapper assigned for :cache_helper_value

See Also:

Author:

  • manveru



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# File 'lib/ramaze/helper/cache.rb', line 86

def cache_value(key = nil, options = {})
  cache = Ramaze::Cache.cache_helper_value

  if key and block_given?
    if found = cache[key]
      found
    else
      cache.store(key, yield, options)
    end
  else
    cache
  end
end

- (String) cache_wrap(action) { ... }

Returns the response body

Parameters:

  • action (Action) —

    The currently wrapped action

Yields:

  • The next block in wrap_action_call

Returns:

  • (String) —

    the response body

See Also:

  • Innate::Node#wrap_action_call

Author:

  • manveru



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# File 'lib/ramaze/helper/cache.rb', line 30

def cache_wrap(action)
  cache = Innate::Cache.action

  ancestral_trait[:cache_action].each do |cache_action|
    temp  = cache_action.dup
    block = temp.delete(:key)
    ttl   = temp.delete(:ttl)

    if temp.all?{|key, value| action[key] == value }
      cache_key = action.full_path
      cache_key << "_#{action.instance.instance_eval(&block).to_s}" if block

      if cached = cache[cache_key]
        action.options[:content_type] = cached[:type]
      else
        cached = {
          :body => catch(:respond) { yield },
          :type => response['Content-Type']
        }

        if ttl
          cache.store(cache_key, cached, :ttl => ttl)
        else
          cache.store(cache_key, cached)
        end
      end

      return cached[:body]
    end
  end

  yield
end