Class: Rider::Queue

Inherits:
Object
  • Object
show all
Defined in:
lib/rider/queue.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filename) ⇒ Queue

Returns a new instance of Queue.

Raises:

  • (ArgumentError) 


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# File 'lib/rider/queue.rb', line 4

def initialize(filename)
  raise(ArgumentError, "queues must have a filename") if !filename or filename.empty?
  @filename = filename
end

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/rider/queue.rb', line 3

def filename
  @filename
end

Instance Method Details

#clear ⇒ Object 



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# File 'lib/rider/queue.rb', line 31

def clear
  File.unlink(filename) if File.exist?(filename)
  return true
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rider/queue.rb', line 36

def empty?
  !File.exist?(filename) or File.open(filename).read == ""
end

#push(item) ⇒ Object 



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# File 'lib/rider/queue.rb', line 9

def push(item)
  Rider.log.debug("Q #{filename} PUSH #{item}")
  File.open(filename, "a") do |file|
    file.puts(item)
  end
  return true
end

#shift ⇒ Object 



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# File 'lib/rider/queue.rb', line 17

def shift
  if empty?
    Rider.log.debug("Q #{filename} SHIFT nil")        
    return nil
  end
  lines = File.readlines(filename)
  item = lines.shift.strip
  File.open(filename, "w") do |file|
    file.write(lines.join)
  end
  Rider.log.debug("Q #{filename} SHIFT #{item}")
  return item
end