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
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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
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Higher up the call stack, we handle the exception.
begin
stuff = readData(socket)
# .. process stuff
rescue RetryException => detail
retry if detail.okToRetry
raise
end
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