Class: SimpleQueue

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#uri ⇒ Object

Returns the value of attribute uri.



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# File 'lib/simple_queue.rb', line 7

def uri
  @uri
end

Class Method Details

.create ⇒ Object 



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# File 'lib/simple_queue.rb', line 42

def self.create
  file = Tempfile.new('simple_queue')
  file.puts [].to_json
  uri = file.path
  file.close
  return new(uri)
end

.get(uri) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/simple_queue.rb', line 50

def self.get(uri)
  raise ArgumentError.new("Queue file must exist: #{uri}") unless File.exists?(uri)
  return new(uri)
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/simple_queue.rb', line 9

def close
  File.delete(uri)
end

#pop ⇒ Object 



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# File 'lib/simple_queue.rb', line 22

def pop
  result = nil
  queue_empty = true

  while queue_empty
    queue_empty, result = pop_nowait()
    sleep(0.1) if queue_empty
  end
  
  return result
end

#push(value) ⇒ Object 



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# File 'lib/simple_queue.rb', line 13

def push(value)
  with_queue_file do |file|
    contents = file.read
    queue = JSON.parse(contents)
    queue.push(value)
    store_queue(file, queue)
  end
end

#size ⇒ Object 



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# File 'lib/simple_queue.rb', line 34

def size
  contents = ''
  with_queue_file do |file|
    contents = file.read
  end
  return JSON.parse(contents).size
end