Class: BwLimiterProxy

Inherits:
Object
  • Object
show all
Defined in:
lib/tidy/bwlimit.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input_rate, output_rate, is_global_limit, ticks) ⇒ BwLimiterProxy

Returns a new instance of BwLimiterProxy.



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# File 'lib/tidy/bwlimit.rb', line 200

def initialize(input_rate, output_rate, is_global_limit, ticks)
  @input_rate = input_rate
  @output_rate = output_rate
  @ticks = ticks
  if @is_global_limit = is_global_limit
    @input_limiter = BwLimiter.new(@input_rate, @ticks)
    @output_limiter = BwLimiter.new(@output_rate, @ticks)
  end
end

Instance Attribute Details

#input_limiter ⇒ Object (readonly)

Returns the value of attribute input_limiter.



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# File 'lib/tidy/bwlimit.rb', line 130

def input_limiter
  @input_limiter
end

#input_rate ⇒ Object (readonly)

Returns the value of attribute input_rate.



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# File 'lib/tidy/bwlimit.rb', line 127

def input_rate
  @input_rate
end

#is_global_limit ⇒ Object (readonly)

Returns the value of attribute is_global_limit.



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# File 'lib/tidy/bwlimit.rb', line 126

def is_global_limit
  @is_global_limit
end

#output_limiter ⇒ Object (readonly)

Returns the value of attribute output_limiter.



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# File 'lib/tidy/bwlimit.rb', line 131

def output_limiter
  @output_limiter
end

#output_rate ⇒ Object (readonly)

Returns the value of attribute output_rate.



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# File 'lib/tidy/bwlimit.rb', line 128

def output_rate
  @output_rate
end

#ticks ⇒ Object (readonly)

Returns the value of attribute ticks.



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# File 'lib/tidy/bwlimit.rb', line 129

def ticks
  @ticks
end

Class Method Details

.create_consumer_thread(name, socket, socket_mutex, queue, queue_mutex, queue_added_cond, write_limiter) ⇒ Object 



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# File 'lib/tidy/bwlimit.rb', line 82

def self.create_consumer_thread(name, socket, socket_mutex, 
      queue, queue_mutex, queue_added_cond,
      write_limiter)
  my_queue = nil
  Thread.new{
    while (1)
  queue_mutex.synchronize {
 queue_added_cond.wait(queue_mutex)
 my_queue = queue.clone
 queue.clear
  }
  while (my_queue && my_queue.length > 0)
 result = select(nil, [socket], [socket], nil)
 if result[1].length > 0
   n_write = write_limiter.dispense
   socket_mutex.synchronize {
     n_write = socket.send(my_queue[0..n_write].join, 0)
   }
   my_queue.slice!(0..n_write);
   #puts "REMOTE: written #{n_write}"
 elsif result[2].length > 0
   raise "#{name} send error"
 end
  end
    end
  }
end

.create_producer_thread(name, socket, socket_mutex, queue, queue_mutex, queue_added_cond, read_limiter, kill_thread_proc) ⇒ Object 



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# File 'lib/tidy/bwlimit.rb', line 49

def self.create_producer_thread(name, socket, socket_mutex, 
      queue, queue_mutex, queue_added_cond,
      read_limiter, kill_thread_proc)
  Thread.new {
    read_s = nil
    while (1)
  result = select([socket], nil, [socket], nil)
  if result[0].length > 0
 n_read = read_limiter.dispense
 #puts "#{name} need to read #{n_read}"
 socket_mutex.synchronize {
   read_s = socket.recv(n_read)
 }
 if (read_s.length == 0)
   #puts "#{name} closed"
   kill_thread_proc.call
   break # or Thread.stop
 else
   queue_mutex.synchronize {
     read_s.split(//).each {|i| queue << i}
     #puts "#{name}: read #{read_s.length}"
     queue_added_cond.signal
   }
 end
  elsif result[2].length > 0
 raise "#{name} read error"
  end
    end
  }
end

.make_nonblocking(io) ⇒ Object 



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# File 'lib/tidy/bwlimit.rb', line 112

def self.make_nonblocking(io)
  io.fcntl(Fcntl::F_SETFD, io.fcntl(Fcntl::F_GETFD) | Fcntl::O_NONBLOCK)
end

.make_proc_kill_thread(t_parent) ⇒ Object 



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# File 'lib/tidy/bwlimit.rb', line 117

def self.make_proc_kill_thread(t_parent)
  proc{t_parent[:thread_list].each {|t| 
  t.kill if Thread.current != t
  #puts "Killed: #{t.inspect}"; 
    }
  }
end

Instance Method Details

#session(l_socket, r_socket) ⇒ Object 



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# File 'lib/tidy/bwlimit.rb', line 133

def session(l_socket, r_socket)
  [l_socket, r_socket].each {|io|
    BwLimiterProxy.make_nonblocking io
  }
  
  proc_kill_thread =  BwLimiterProxy.make_proc_kill_thread(Thread.current)
  
  if @is_global_limit
    input_limiter = @input_limiter
    output_limiter = @output_limiter
  else
    t_current = Thread.current;
    input_limiter = BwLimiter.new(@input_rate, @ticks)
    output_limiter = BwLimiter.new(@output_rate, @ticks)
  end
  local_input_limiter = ConstantBwLimiter.new
  local_output_limiter = ConstantBwLimiter.new

  outgoing_queue = [] #from l->r
  outgoing_mutex = Mutex.new
  outgoing_produced = ConditionVariable.new

  incoming_queue = [] #from r->l
  incoming_mutex = Mutex.new
  incoming_produced = ConditionVariable.new
  
  l_socket_mutex = Mutex.new
  r_socket_mutex = Mutex.new

  t_outgoing_producer = 
    BwLimiterProxy.create_producer_thread("LOCAL", l_socket, l_socket_mutex,
          outgoing_queue, outgoing_mutex, 
          outgoing_produced,
          local_output_limiter, 
          proc_kill_thread)
  t_incoming_producer = 
    BwLimiterProxy.create_producer_thread("REMOTE", r_socket, r_socket_mutex,
          incoming_queue, incoming_mutex, 
          incoming_produced,
          input_limiter, 
          proc_kill_thread)
  t_outgoing_consumer = 
    BwLimiterProxy.create_consumer_thread("REMOTE", r_socket, r_socket_mutex,
          outgoing_queue, outgoing_mutex, 
          outgoing_produced,
          output_limiter)
  t_incoming_consumer =
    BwLimiterProxy.create_consumer_thread("LOCAL", l_socket, l_socket_mutex,
           incoming_queue, incoming_mutex, 
           incoming_produced,
           local_input_limiter)
  
  t_current = Thread.current
  t_current[:thread_list] = [t_outgoing_producer, t_incoming_producer, 
    t_outgoing_consumer, t_incoming_consumer]
  #t_current[:thread_list].each{|t| puts "Threads: #{t.inspect}"}

  t_current[:thread_list].each {|t| 
    t.join; 
    #puts "Joined: #{t.inspect}"; 
  }
  l_socket.close
  r_socket.close
  #puts "Exiting cleanly"
end