Class: Baykit::BayServer::Util::Selector

Inherits:
Object
  • Object
show all
Defined in:
lib/baykit/bayserver/util/selector.rb

Overview

Like Selector class of Python

Constant Summary collapse

OP_READ = 
1
OP_WRITE = 
2

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Selector

Returns a new instance of Selector.



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# File 'lib/baykit/bayserver/util/selector.rb', line 15

def initialize
  @channels = {}
  @lock = Mutex.new()
end

Instance Attribute Details

#channels ⇒ Object (readonly)

Returns the value of attribute channels.



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# File 'lib/baykit/bayserver/util/selector.rb', line 12

def channels
  @channels
end

#lock ⇒ Object (readonly)

Returns the value of attribute lock.



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# File 'lib/baykit/bayserver/util/selector.rb', line 13

def lock
  @lock
end

Instance Method Details

#count ⇒ Object 



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# File 'lib/baykit/bayserver/util/selector.rb', line 85

def count()
  @lock.synchronize do
    return @channels.length
  end
end

#get_op(ch) ⇒ Object 



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# File 'lib/baykit/bayserver/util/selector.rb', line 48

def get_op(ch)
  return @channels[ch]
end

#modify(ch, op) ⇒ Object 



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# File 'lib/baykit/bayserver/util/selector.rb', line 34

def modify(ch, op)
  if op & OP_READ != 0
    register_read(ch, @channels)
  else
    unregister_read(ch, @channels)
  end

  if op & OP_WRITE != 0
    register_write(ch, @channels)
  else
    unregister_write(ch, @channels)
  end
end

#register(ch, op) ⇒ Object 



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# File 'lib/baykit/bayserver/util/selector.rb', line 20

def register(ch, op)
  if op & OP_READ != 0
    register_read(ch, @channels)
  end
  if op & OP_WRITE != 0
    register_write(ch, @channels)
  end
end

#select(timeout = 0) ⇒ Object 



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# File 'lib/baykit/bayserver/util/selector.rb', line 52

def select(timeout = 0)
  except_list = []

  read_list = []
  write_list = []
  @lock.synchronize do
    @channels.keys().each do |ch|
      if (@channels[ch] & OP_READ) != 0
        read_list << ch
      end
      if (@channels[ch] & OP_WRITE) != 0
        write_list << ch
      end
    end
  end
  selected_read_list, selected_write_list = Kernel.select(read_list, write_list, except_list, timeout)

  result = {}
  if selected_read_list
    selected_read_list.each do |ch|
      register_read(ch, result)
    end
  end

  if selected_write_list
    selected_write_list.each do |ch|
      register_write(ch, result)
    end
  end

  return result
end

#unregister(ch) ⇒ Object 



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# File 'lib/baykit/bayserver/util/selector.rb', line 29

def unregister(ch)
  unregister_read(ch, @channels)
  unregister_write(ch, @channels)
end