Class: ActionView::Resolver::Cache

Inherits:
Object
  • Object
show all
Defined in:
lib/action_view/template/resolver.rb

Overview

Threadsafe template cache

Defined Under Namespace

Classes: SmallCache

Constant Summary collapse

PARTIAL_BLOCK =

preallocate all the default blocks for performance/memory consumption reasons

lambda { |cache, partial| cache[partial] = SmallCache.new }
PREFIX_BLOCK = 
lambda { |cache, prefix|  cache[prefix]  = SmallCache.new(&PARTIAL_BLOCK) }
NAME_BLOCK = 
lambda { |cache, name|    cache[name]    = SmallCache.new(&PREFIX_BLOCK) }
KEY_BLOCK = 
lambda { |cache, key|     cache[key]     = SmallCache.new(&NAME_BLOCK) }
NO_TEMPLATES =

usually a majority of template look ups return nothing, use this canonical preallocated array to save memory

[].freeze

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Cache

Returns a new instance of Cache.



55
56
57
58
 
# File 'lib/action_view/template/resolver.rb', line 55

def initialize
  @data = SmallCache.new(&KEY_BLOCK)
  @query_cache = SmallCache.new
end

Instance Method Details

#cache(key, name, prefix, partial, locals) ⇒ Object

Cache the templates returned by the block



65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/action_view/template/resolver.rb', line 65

def cache(key, name, prefix, partial, locals)
  if Resolver.caching?
    @data[key][name][prefix][partial][locals] ||= canonical_no_templates(yield)
  else
    fresh_templates  = yield
    cached_templates = @data[key][name][prefix][partial][locals]

    if templates_have_changed?(cached_templates, fresh_templates)
      @data[key][name][prefix][partial][locals] = canonical_no_templates(fresh_templates)
    else
      cached_templates || NO_TEMPLATES
    end
  end
end

#cache_query(query) ⇒ Object

:nodoc:



80
81
82
83
84
85
86
 
# File 'lib/action_view/template/resolver.rb', line 80

def cache_query(query) # :nodoc:
  if Resolver.caching?
    @query_cache[query] ||= canonical_no_templates(yield)
  else
    yield
  end
end

#clear ⇒ Object 



88
89
90
91
 
# File 'lib/action_view/template/resolver.rb', line 88

def clear
  @data.clear
  @query_cache.clear
end

#inspect ⇒ Object 



60
61
62
 
# File 'lib/action_view/template/resolver.rb', line 60

def inspect
  "#<#{self.class.name}:0x#{(object_id << 1).to_s(16)} keys=#{@data.size} queries=#{@query_cache.size}>"
end

#size ⇒ Object

Get the cache size. Do not call this method. This method is not guaranteed to be here ever.



95
96
97
98
99
100
101
102
103
104
105
106
107
108
 
# File 'lib/action_view/template/resolver.rb', line 95

def size # :nodoc:
  size = 0
  @data.each_value do |v1|
    v1.each_value do |v2|
      v2.each_value do |v3|
        v3.each_value do |v4|
          size += v4.size
        end
      end
    end
  end

  size + @query_cache.size
end