Class: Rakie::Channel

Inherits:
Object
  • Object
show all
Defined in:
lib/rakie/channel.rb

Direct Known Subclasses

TCPChannel

Constant Summary collapse

DEFAULT_BUFFER_SIZE = 
512 * 1024

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(io, delegate = nil) ⇒ Channel

Returns a new instance of Channel.



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# File 'lib/rakie/channel.rb', line 7

def initialize(io, delegate=nil)
  @io = io
  @read_buffer = String.new
  @write_buffer = String.new
  @write_task = []
  @delegate = delegate
  Event.push(io, self, Event::READ_EVENT)
end

Instance Attribute Details

#delegate ⇒ Object

Returns the value of attribute delegate.



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# File 'lib/rakie/channel.rb', line 3

def delegate
  @delegate
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/rakie/channel.rb', line 149

def close
  if @io.closed?
    return nil
  end

  Event.delete(@io)
  return nil
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rakie/channel.rb', line 162

def closed?
  @io.closed?
end

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rakie/channel.rb', line 158

def eof?
  @read_buffer.empty?
end

#handle_write(len) ⇒ Object 



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# File 'lib/rakie/channel.rb', line 53

def handle_write(len)
  task = @write_task[0]

  while len > 0
    if len < task
      @write_task[0] = task - len
    end

    len -= task
    @write_task.shift

    if @delegate != nil
      @delegate.on_send(self)
       Log.debug("Channel handle on_send")
    end
  end
end

#on_detach(io) ⇒ Object 



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# File 'lib/rakie/channel.rb', line 106

def on_detach(io)
  begin
    io.close

    if @delegate
      @delegate.on_close(self)
    end

  rescue
    Log.debug("Channel is already closed")
  end

  Log.debug("Channel close ok")
end

#on_read(io) ⇒ Object 



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# File 'lib/rakie/channel.rb', line 16

def on_read(io)
  begin
    loop do
      @read_buffer << io.read_nonblock(DEFAULT_BUFFER_SIZE)
    end

  rescue IO::EAGAINWaitReadable
    Log.debug("Channel read pending")

  rescue IO::EWOULDBLOCKWaitReadable
    Log.debug("Channel read pending")

  rescue Exception => e
    # Process the last message on exception
    if @delegate != nil
      @delegate.on_recv(self, @read_buffer)
      @read_buffer = String.new # Reset buffer
    end

    Log.debug("Channel error #{io}: #{e}")
    return Event::HANDLE_FAILED
  end

  if @delegate != nil
    Log.debug("Channel handle on_recv")
    len = @delegate.on_recv(self, @read_buffer)

    if len > @read_buffer.length
      len = @read_buffer.length
    end

    @read_buffer = @read_buffer[len .. -1]
  end

  return Event::HANDLE_CONTINUED
end

#on_write(io) ⇒ Object 



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# File 'lib/rakie/channel.rb', line 71

def on_write(io)
  len = 0
  offset = 0

  begin
    while @write_buffer.length > 0
      len = io.write_nonblock(@write_buffer)
      offset += len
      @write_buffer = @write_buffer[len .. -1]
    end

    Log.debug("Channel write finished")

  rescue IO::EAGAINWaitWritable
    self.handle_write(offset)

    Log.debug("Channel write pending")
    return Event::HANDLE_CONTINUED

  rescue IO::EWOULDBLOCKWaitWritable
    self.handle_write(offset)

    Log.debug("Channel write pending")
    return Event::HANDLE_CONTINUED

  rescue
    Log.debug("Channel close #{io}")
    return Event::HANDLE_FAILED
  end

  self.handle_write(offset)

  return Event::HANDLE_FINISHED
end

#read(size) ⇒ Object 



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# File 'lib/rakie/channel.rb', line 121

def read(size)
  if self.eof?
    return ""
  end

  if size > data.length
    size = data.length
  end

  data = @read_buffer[0 .. (size - 1)]
  @read_buffer = @read_buffer[size .. -1]

  return data
end

#write(data) ⇒ Object 



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# File 'lib/rakie/channel.rb', line 136

def write(data)
  if @io.closed?
    return -1
  end

  @write_buffer << data
  @write_task << data.length

  Event.modify(@io, self, (Event::READ_EVENT | Event::WRITE_EVENT))

  return 0
end