Class: Async::HTTP::Cache::Store::Memory

Inherits:
Object
  • Object
show all
Defined in:
lib/async/http/cache/store/memory.rb

Constant Summary collapse

IF_NONE_MATCH = 
'if-none-match'
NOT_MODIFIED = 
::Protocol::HTTP::Response[304]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(limit: 1024) ⇒ Memory

Returns a new instance of Memory.



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# File 'lib/async/http/cache/store/memory.rb', line 28

def initialize(limit: 1024)
  @index = {}
  @limit = limit
  
  @hit = 0
  @miss = 0
  @pruned = 0
  
  @gardener = Async do |task|
    while true
      task.sleep(60)
      
      pruned = self.prune
      @pruned += pruned
      
      Async.logger.debug(self) do |buffer|
        if pruned > 0
          buffer.puts "Pruned #{pruned} entries."
        end
        
        buffer.puts "Hits: #{@hit} Misses: #{@miss} Pruned: #{@pruned} Ratio: #{(100.0*@hit/@miss).round(2)}%"
        
        body_usage = @index.sum{|key, value| value.body.length}
        buffer.puts "Index size: #{@index.size} Memory usage: #{(body_usage / 1024.0**2).round(2)}MiB"
        
        # @index.each do |key, value|
        #   buffer.puts "#{key.join('-')}: #{value.body.length}B"
        # end
      end
    end
  end
end

Instance Attribute Details

#index ⇒ Object (readonly)

Returns the value of attribute index.



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# File 'lib/async/http/cache/store/memory.rb', line 65

def index
  @index
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/async/http/cache/store/memory.rb', line 61

def close
  @gardener.stop
end

#insert(key, request, response) ⇒ Object 



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# File 'lib/async/http/cache/store/memory.rb', line 96

def insert(key, request, response)
  if @index.size < @limit
    length = response.body&.length
    if length.nil? or length < 1024*64
      @index[key] = response
    end
  end
end

#lookup(key, request) ⇒ Object 



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# File 'lib/async/http/cache/store/memory.rb', line 70

def lookup(key, request)
  if response = @index[key]
    if response.expired?
      @index.delete(key)
      
      @pruned += 1
      
      return nil
    end
    
    if etags = request.headers[IF_NONE_MATCH]
      if etags.include?(response.etag)
        return NOT_MODIFIED
      end
    end
    
    @hit += 1
    
    return response.dup
  else
    @miss += 1
    
    return nil
  end
end

#prune ⇒ Integer

Returns the number of pruned entries.

Returns:

  • (Integer) —

    the number of pruned entries.



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# File 'lib/async/http/cache/store/memory.rb', line 106

def prune
  initial_count = @index.size
  
  @index.delete_if do |key, value|
    value.expired?
  end
  
  return initial_count - @index.size
end