Class: BloomFilter::Server

Inherits:
EM::Connection
  • Object
show all
Defined in:
lib/bloom_filter/server.rb

Constant Summary collapse

PACK_N = 
"N"

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.filter ⇒ Object 



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# File 'lib/bloom_filter/server.rb', line 17

def self.filter
  @filter
end

.filter=(filter) ⇒ Object 



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# File 'lib/bloom_filter/server.rb', line 21

def self.filter=(filter)
  @filter = filter
end

Instance Method Details

#post_init ⇒ Object 



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# File 'lib/bloom_filter/server.rb', line 25

def post_init
  @buffer = nil
  @size = nil
end

#process_request(request) ⇒ Object 



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# File 'lib/bloom_filter/server.rb', line 54

def process_request(request)
  request_type, request_body = request[0,1], request[1..-1]
  case request_type.to_i
  when Protocol::ADD
    self.class.filter.add(request_body)
    write_response(true)
  when Protocol::ADD_MANY
    # TODO: support specifying a delimiter
    request_body.split(Protocol::DEFAULT_SEPARATOR).collect { |el| self.class.filter.add(el) }
  when Protocol::INCLUDE
    write_response(self.class.filter.include?(request_body))
  when Protocol::INCLUDE_MANY
    # TODO: support specifying a delimiter
    write_response(request_body.split(Protocol::DEFAULT_SEPARATOR).collect { |el| self.class.filter.include?(el) })
  when Protocol::DUMP
    begin
      File.open(request_body, "w") do |f|
        f.write(self.class.filter.dump)
      end
      write_response(true)
    rescue Exception => e
      write_response(false)
    end
  when Protocol::LOAD
    begin
      File.open(request_body, "r") do |file|
        self.class.filter.replace(file)
      end
      write_response(true)
    rescue Exception => e
      write_response(false)
    end
  end
end

#receive_data(data) ⇒ Object 



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# File 'lib/bloom_filter/server.rb', line 30

def receive_data(data)
  @buffer ||= ""
  @buffer << data

  if !@size && @buffer.size > 4
    @size, @buffer = @buffer[0,4].unpack(PACK_N).first, @buffer[4..-1]
  end

  if @size && @buffer.size >= @size
    if @buffer.size > @size
      request, remainder = @buffer[0, @size], @buffer[@size..-1]
      @buffer = nil
      @size = nil
      process_request(request)

      receive_data(remainder)
    else
      process_request(@buffer)
      @buffer = nil
      @size = nil        
    end
  end
end

#write_response(response) ⇒ Object 



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# File 'lib/bloom_filter/server.rb', line 89

def write_response(response)
  response = Array(response)
  vector = BitVector.new(response.size)
  response.each_with_index { |t, index| vector[index] = t }
  str = vector.to_s
  send_data([str.size].pack(PACK_N) + str)
end