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Ruby Programming
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Adding Information to Exceptions

You can define your own exceptions to hold any information that you need to pass out from the site of an error. For example, certain types of network errors might be transient depending on the circumstances. If such an error occurs, and the circumstances are right, you could set a flag in the exception to tell the handler that it might be worth retrying the operation.

class RetryException < RuntimeError
  attr :okToRetry
  def initialize(okToRetry)
    @okToRetry = okToRetry
  end
end

Somewhere down in the depths of the code, a transient error occurs.

def readData(socket)
  data = socket.read(512)
  if data.nil?
    raise RetryException.new(true), "transient read error"
  end
  # .. normal processing
end

Higher up the call stack, we handle the exception.

begin
  stuff = readData(socket)
  # .. process stuff
rescue RetryException => detail
  retry if detail.okToRetry
  raise
end
Ruby Programming
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