1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
require 'active_support/core_ext/object/blank'
module ActiveRecord
# = Active Record Query Cache
class QueryCache
module ClassMethods
# Enable the query cache within the block if Active Record is configured.
def cache(&block)
if ActiveRecord::Base.configurations.blank?
yield
else
connection.cache(&block)
end
end
# Disable the query cache within the block if Active Record is configured.
def uncached(&block)
if ActiveRecord::Base.configurations.blank?
yield
else
connection.uncached(&block)
end
end
end
def initialize(app)
@app = app
end
class BodyProxy # :nodoc:
def initialize(original_cache_value, target, connection_id)
@original_cache_value = original_cache_value
@target = target
@connection_id = connection_id
end
def method_missing(method_sym, *arguments, &block)
@target.send(method_sym, *arguments, &block)
end
def respond_to?(method_sym, include_private = false)
super || @target.respond_to?(method_sym)
end
def each(&block)
@target.each(&block)
end
def close
@target.close if @target.respond_to?(:close)
ensure
ActiveRecord::Base.connection_id = @connection_id
ActiveRecord::Base.connection.clear_query_cache
unless @original_cache_value
ActiveRecord::Base.connection.disable_query_cache!
end
end
end
def call(env)
old = ActiveRecord::Base.connection.query_cache_enabled
ActiveRecord::Base.connection.enable_query_cache!
status, headers, body = @app.call(env)
[status, headers, BodyProxy.new(old, body, ActiveRecord::Base.connection_id)]
rescue Exception => e
ActiveRecord::Base.connection.clear_query_cache
unless old
ActiveRecord::Base.connection.disable_query_cache!
end
raise e
end
end
end
|
