Class: Cache::YAMLCache

Inherits:
Object
  • Object
show all
Defined in:
lib/jiji/util/cache.rb

Instance Method Summary collapse

Constructor Details

#initialize(delegate, range, cache_file_prefix, regex = ".*", &block) ⇒ YAMLCache

Returns a new instance of YAMLCache.



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# File 'lib/jiji/util/cache.rb', line 43

def initialize(delegate, range, cache_file_prefix, regex=".*", &block)
  @delegate = delegate
  @range = range
  @cache_file_prefix = cache_file_prefix
  @regex = regex
  @block = block
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args) ⇒ Object 



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# File 'lib/jiji/util/cache.rb', line 51

def method_missing(name, *args )

  return @delegate.send( name, *args ) if ( !name.to_s.match(@regex) )

  cache_file =  @cache_file_prefix + "_" +  name.to_s
  cache_file += "_" + @block.call(name,*args) if @block != nil

  cache_file += ".yaml"

  flock = FileLock.new(cache_file + ".lock")
  current = Time.new

  res = nil
  flock.writelock(){
    # キャッシュがあればキャッシュから読む
    if ( File.exist?(cache_file) && current.to_i < (File.mtime(cache_file).to_i + @range) )
      res = YAML.load_file cache_file
    elsif
      res =  @delegate.send( name, *args )
      File.open( cache_file, "w" ) { |f|
        f.write( YAML.dump(res) )
      }
      File.utime(current, current, cache_file)
    end
  }
  return res
end