Class: Circuitry::Subscriber

Inherits:
Object
  • Object
show all
Includes:
Concerns::Async, Circuitry::Services::SQS
Defined in:
lib/circuitry/subscriber.rb

Constant Summary collapse

DEFAULT_OPTIONS = 
{
    async: false,
    wait_time: 10,
    batch_size: 10,
}.freeze
CONNECTION_ERRORS = 
[
    Excon::Errors::Forbidden,
].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Circuitry::Services::SQS

#sqs

Methods included from Concerns::Async

#platform_supports_async?, #process_asynchronously

Constructor Details

#initialize(queue, options = {}) ⇒ Subscriber

Returns a new instance of Subscriber.

Raises:

  • (ArgumentError) 


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# File 'lib/circuitry/subscriber.rb', line 24

def initialize(queue, options = {})
  raise ArgumentError.new('queue cannot be nil') if queue.nil?

  options = DEFAULT_OPTIONS.merge(options)

  @queue = queue
  @async = !!options[:async]
  @wait_time = options[:wait_time]
  @batch_size = options[:batch_size]
end

Instance Attribute Details

#batch_size ⇒ Object (readonly)

Returns the value of attribute batch_size.



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# File 'lib/circuitry/subscriber.rb', line 12

def batch_size
  @batch_size
end

#failure_queue ⇒ Object (readonly)

Returns the value of attribute failure_queue.



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# File 'lib/circuitry/subscriber.rb', line 12

def failure_queue
  @failure_queue
end

#max_retries ⇒ Object (readonly)

Returns the value of attribute max_retries.



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# File 'lib/circuitry/subscriber.rb', line 12

def max_retries
  @max_retries
end

#queue ⇒ Object (readonly)

Returns the value of attribute queue.



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# File 'lib/circuitry/subscriber.rb', line 12

def queue
  @queue
end

#wait_time ⇒ Object (readonly)

Returns the value of attribute wait_time.



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# File 'lib/circuitry/subscriber.rb', line 12

def wait_time
  @wait_time
end

Instance Method Details

#async? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/circuitry/subscriber.rb', line 61

def async?
  @async
end

#subscribe(&block) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/circuitry/subscriber.rb', line 35

def subscribe(&block)
  raise ArgumentError.new('block required') if block.nil?

  unless can_subscribe?
    logger.warn('Circuitry unable to subscribe: AWS configuration is not set.')
    return
  end

  process = -> do
    loop do
      begin
        receive_messages(&block)
      rescue *CONNECTION_ERRORS => e
        logger.error "Connection error to #{queue}: #{e}"
        raise SubscribeError.new(e)
      end
    end
  end

  if async?
    process_asynchronously(&process)
  else
    process.call
  end
end