Module: CacheVersion

Defined in:
lib/cache_version.rb

Class Method Summary collapse

Class Method Details

.cache ⇒ Object 



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# File 'lib/cache_version.rb', line 15

def self.cache
  CACHE
end

.clear_cache ⇒ Object 



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# File 'lib/cache_version.rb', line 43

def self.clear_cache
  @version_by_key = {}
end

.db ⇒ Object 



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# File 'lib/cache_version.rb', line 6

def self.db
  db = ActiveRecord::Base.connection
  if defined?(DataFabric::ConnectionProxy) and db.kind_of?(DataFabric::ConnectionProxy)
    db.send(:master)
  else
    db
  end
end

.get(key) ⇒ Object 



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# File 'lib/cache_version.rb', line 19

def self.get(key)
  key = key.to_s
  version_by_key[key] ||= CACHE.get_or_add(cache_key(key)) do
    db.select_value("SELECT version FROM cache_versions WHERE key = '#{key}'").to_i
  end
end

.increment(key) ⇒ Object 



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# File 'lib/cache_version.rb', line 26

def self.increment(key)
  key = key.to_s
  if get(key) == 0
    db.execute("INSERT INTO cache_versions (key, version) VALUES ('#{key}', 1)")
  else
    db.execute("UPDATE cache_versions SET version = version + 1 WHERE key = '#{key}'")
  end
  invalidate_cache(key)
  get(key)
end

.invalidate_cache(key) ⇒ Object 



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# File 'lib/cache_version.rb', line 37

def self.invalidate_cache(key)
  key = key.to_s
  cache.delete(cache_key(key))
  version_by_key.delete(key)
end