Class: WorkQueue::Socket

Inherits:
Object
  • Object
show all
Defined in:
lib/scout/work_queue/socket.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(serializer = nil) ⇒ Socket

Returns a new instance of Socket.



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# File 'lib/scout/work_queue/socket.rb', line 7

def initialize(serializer = nil)
  @sread, @swrite = Open.pipe

  @serializer = serializer || Marshal

  @key = "/" + rand(1000000000).to_s << '.' << Process.pid.to_s;
  @write_sem = @key + '.in'
  @read_sem = @key + '.out'
  Log.debug "Creating socket semaphores: #{@key}"
  ScoutSemaphore.create_semaphore(@write_sem,1)
  ScoutSemaphore.create_semaphore(@read_sem,1)
end

Instance Attribute Details

#cleaned ⇒ Object

Returns the value of attribute cleaned.



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# File 'lib/scout/work_queue/socket.rb', line 6

def cleaned
  @cleaned
end

#exception ⇒ Object

Returns the value of attribute exception.



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# File 'lib/scout/work_queue/socket.rb', line 6

def exception
  @exception
end

#read_sem ⇒ Object

Returns the value of attribute read_sem.



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# File 'lib/scout/work_queue/socket.rb', line 6

def read_sem
  @read_sem
end

#sread ⇒ Object

Returns the value of attribute sread.



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# File 'lib/scout/work_queue/socket.rb', line 6

def sread
  @sread
end

#swrite ⇒ Object

Returns the value of attribute swrite.



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# File 'lib/scout/work_queue/socket.rb', line 6

def swrite
  @swrite
end

#write_sem ⇒ Object

Returns the value of attribute write_sem.



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# File 'lib/scout/work_queue/socket.rb', line 6

def write_sem
  @write_sem
end

Instance Method Details

#abort(exception) ⇒ Object 



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# File 'lib/scout/work_queue/socket.rb', line 124

def abort(exception)
  @exception = exception
  @swrite.close unless closed_write?
end

#clean ⇒ Object 



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# File 'lib/scout/work_queue/socket.rb', line 24

def clean
  return if @cleaned
  @cleaned = true
  @sread.close unless @sread.closed?
  @swrite.close unless @swrite.closed?
  Log.low "Destroying socket semaphores: #{[@key] * ", "}"
  ScoutSemaphore.delete_semaphore(@write_sem)
  ScoutSemaphore.delete_semaphore(@read_sem)
end

#close_read ⇒ Object 



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# File 'lib/scout/work_queue/socket.rb', line 105

def close_read
  @sread.close unless closed_read?
end

#close_write ⇒ Object 



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# File 'lib/scout/work_queue/socket.rb', line 100

def close_write
  self.dump ClosedStream.new
  @swrite.close unless closed_write?
end

#closed_read? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout/work_queue/socket.rb', line 92

def closed_read?
  @sread.closed?
end

#closed_write? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/scout/work_queue/socket.rb', line 96

def closed_write?
  @swrite.closed?
end

#dump(obj) ⇒ Object 



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# File 'lib/scout/work_queue/socket.rb', line 35

def dump(obj)
  stream = @swrite
  obj.concurrent_stream = nil if obj.respond_to?(:concurrent_stream)
  case obj
  when Integer
    size_head = [obj,"I"].pack 'La'
    str = size_head
  when nil
    size_head = [0,"N"].pack 'La'
    str = size_head
  when Annotation::AnnotatedObject
    payload = @serializer.dump(obj)
    size_head = [payload.bytesize,"S"].pack 'La'
    str = size_head << payload
  when String
    payload = obj
    size_head = [payload.bytesize,"C"].pack 'La'
    str = size_head << payload
  else
    payload = @serializer.dump(obj)
    size_head = [payload.bytesize,"S"].pack 'La'
    str = size_head << payload
  end

  write_length = str.length
  wrote = stream.write(str) 
  while wrote < write_length
    wrote += stream.write(str[wrote..-1]) 
  end
end

#load ⇒ Object 



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# File 'lib/scout/work_queue/socket.rb', line 66

def load
  stream = @sread
  size_head = Open.read_stream stream, 5

  size, type = size_head.unpack('La')

  return nil if type == "N"
  return size.to_i if type == "I"
  begin
    payload = Open.read_stream stream, size
    case type
    when "S"
      begin
        @serializer.load(payload)
      rescue Exception
        Log.exception $!
        raise $!
      end
    when "C"
      payload
    end
  rescue TryAgain
    retry
  end
end

#pop ⇒ Object Also known as: read 



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# File 'lib/scout/work_queue/socket.rb', line 116

def pop
  ScoutSemaphore.synchronize(@read_sem) do
    res = self.load
    raise res if ClosedStream === res
    res
  end
end

#push(obj) ⇒ Object Also known as: write

{{{ ACCESSOR



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# File 'lib/scout/work_queue/socket.rb', line 110

def push(obj)
  ScoutSemaphore.synchronize(@write_sem) do
    self.dump(obj)
  end
end

#socket_id ⇒ Object 



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# File 'lib/scout/work_queue/socket.rb', line 20

def socket_id
  @key
end