Class: TableChecksum::PerRequestCache

Inherits:
Object
  • Object
show all
Defined in:
lib/table_checksum/per_request_cache.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ PerRequestCache

Returns a new instance of PerRequestCache.



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# File 'lib/table_checksum/per_request_cache.rb', line 23

def initialize(app)
  @app = app
end

Class Method Details

.cache_key ⇒ Object 



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# File 'lib/table_checksum/per_request_cache.rb', line 9

def cache_key
  "#{Process.pid}_#{Thread.current.object_id}".to_sym
end

.clear_the_cache ⇒ Object 



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# File 'lib/table_checksum/per_request_cache.rb', line 13

def clear_the_cache
  @cache.delete(self.cache_key)
end

.fetch(key, &block) ⇒ Object 



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# File 'lib/table_checksum/per_request_cache.rb', line 17

def fetch(key, &block)
  return yield if @cache.nil?
  @cache[self.cache_key][key] ||= yield
end

.open_the_cache ⇒ Object 



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# File 'lib/table_checksum/per_request_cache.rb', line 4

def open_the_cache
  @cache ||= {}
  @cache[self.cache_key] ||= {}
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/table_checksum/per_request_cache.rb', line 27

def call(env)
  self.class.open_the_cache
  @app.call(env)
ensure
  self.class.clear_the_cache
end