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Created March 13, 2020 16:25
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IO classification over Read, Overwrite, Move, Append
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ROMA.md

All external world facilities should have wrappers to support unit-testable and simply clean code.

These external world facilities:

a) might return different data when reads are requested because the data can be changed either by external "actors" or by a concurrent thread of the same client (this lambda); Examples: SQL SELECT, HTTP GET

b) do provide write APIs. We classify writes according if they destroy old data or make it unavailable at old locations

- "Append-Only": not destructive operation increasing amount of information.
    Examples: SQL INSERT, HTTP POST, CloudWatch logger.warning(), S3 put a file ("put" to confuse), SQS send_message()

- "Overwrite": destructive write operations potentially hiding (destroying) the old data.
    Examples: SQL UPDATE and DELETE

- "Restructure": reorganizing operations often not damaging data, but making it unavailable at old locations.
    Examples: file or directory move, SQL ALTER TABLE RENAME COLUMN etc.
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