诗歌rails之model_cache_version

 1 require 'user_sound/has/model_cache_version'
 2 module UserSound
 3   module Has #:nodoc:
 4     module Version #:nodoc:
 5       def self.included(base)
 6         base.extend(ClassMethods)
 7       end
 8 
 9       module ClassMethods
10         def has_cache_groups(*cache_groups)
11           
12         end
13         def has_cache_version_for(*cache_names)   
14           cache_names = cache_names.map {|name| name.to_s}
15 
16           write_inheritable_attribute :cache_names, cache_names
17           class_inheritable_reader    :cache_names  
18           
19           self.send(:include, UserSound::Has::Version::InstanceMethods)
20           
21           cache_names.each do |cache_name| 
22             class_eval <<-EOV   
23               def #{cache_name}_version  
24                 read_or_create_version('#{cache_name}') 
25               end
26               
27               def #{cache_name}_version_number
28                 #{cache_name}_version.version
29               end
30               
31               def inc_#{cache_name}_version
32                   inc_version('#{cache_name}')
33               end                  
34               EOV
35           end                   
36 
37           after_create   :create_versions
38           before_destroy :remove_versions
39         end     
40 
41       end
42 
43       module InstanceMethods    
44         def inc_versions(*cache_names)
45           cache_names.each do |cache_name|
46             inc_version(cache_name)
47           end
48         end
49         private 
50         def create_versions  
51           self.class.cache_names.each do |cache_name| 
52             create_version(cache_name)
53           end
54         end
55 
56         def create_new_version(cache_name)
57           version = UserSound::Has::Version::ModelCacheVersion.create(
58           :model_class=>self.class.name,
59           :model_id => self.id,
60           :cache_name =>cache_name,
61           :version => 0 )
62           version
63         end
64         
65         def create_version(cache_name)
66           version=create_new_version(cache_name)
67           Rails.cache.write("cache_version_for_#{cache_name}/#{self.class.name}/#{self.id}", version)
68           version
69         end
70         
71         def remove_versions
72            UserSound::Has::Version::ModelCacheVersion.delete_all(['model_id = ? and model_class= ?',self.id, self.class.name])
73            self.class.cache_names.each do |cache_name|
74               Rails.cache.delete("cache_version_for_#{cache_name}/#{self.class.name}/#{self.id}")
75            end
76         end              
77         
78         def read_or_create_version(cache_name)
79           Rails.cache.fetch("cache_version_for_#{cache_name}/#{self.class.name}/#{self.id}") do 
80             version=UserSound::Has::Version::ModelCacheVersion.find(:first, 
81                      :conditions=>['model_id = ? and model_class= ? and cache_name=?',
82                        self.id, self.class.name, cache_name])
83             version=create_new_version(cache_name) unless version
84             version
85           end
86         end        
87         def inc_version(cache_name)    
88            read_or_create_version(cache_name)
89            UserSound::Has::Version::ModelCacheVersion.update_all("version=version+1", "model_id = #{self.id} and model_class= '#{self.class.name}' and cache_name='#{cache_name}'")
90            Rails.cache.delete("cache_version_for_#{cache_name}/#{self.class.name}/#{self.id}")
91         end
92       end 
93     end
94   end
95 end

关于write_inheritable_attribute相关调试

 

 1 >> Company.first.cache_names
 2 => ["blacklists", "customer_applyings", "customers", "employees"]
 3 >> class Csub < Company
 4 >> end
 5 => nil
 6 >> Csub.cache_names
 7 => ["blacklists", "customer_applyings", "customers", "employees"]
 8 >> Csub.new.cache_names
 9 => ["blacklists", "customer_applyings", "customers", "employees"]
10 >> Csub.write_inheritable_attribute(:newkey,"newvalue"
11 >> )
12 => "newvalue"
13 >> Csub.read_inheritable_attribute(:newkey)
14 => "newvalue"
15 >> Csub.read_inheritable_attribute(:cache_names)
16 => ["blacklists", "customer_applyings", "customers", "employees"]
17 


posted @ 2010-02-22 15:35  麦飞  阅读(632)  评论(0)  编辑  收藏  举报