Enumerated types can get in the way of fast and safe iteration

http://nightlight.conductor.com/enums-in-distributed-systems/

by iamchrisle • 13 years ago

3 2 13 years ago

nightlight.conductor.com

Default cases are your friend.

Personally, my most wanted feature for enums in general is a way to distinguish between "final" enums - that are intended for enums that cannot change, and a modifiable enums, where they can change and a lack of default case throws a syntax error.

Unfortunately, there is no way to enforce someone not changing a "final" enum.

josh_rosenblum• 13 years ago

Default cases can be helpful. Unfortunately, with generated serdes (as in Thrift, Avro, or Protobufs), you may not have control over the decoding or ability to customize the default case. For some of the details WRT Thrift in particular, there's a related discussion underway on the user mailing list now:

http://mail-archives.apache.org/mod_mbox/thrift-user/201311....

Enumerated types can get in the way of fast and safe iteration

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