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README.md

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In this exercise we ask you to write a command line REPL (read-eval-print loop) that drives a simple in-memory key/value storage system. This system should also allow for nested transactions. A transaction can then be committed or aborted.

  • READ Reads and prints, to stdout, the val associated with key. If the value is not present an error is printed to stderr.

  • WRITE Stores val in key.

  • DELETE Removes all key from store. Future READ commands on that key will return an error.

  • START Start a transaction.

  • COMMIT Commit a transaction. All actions in the current transaction are committed to the parent transaction or the root store. If there is no current transaction an error is output to stderr.

  • ABORT Abort a transaction. All actions in the current transaction are discarded.

  • QUIT Exit the REPL cleanly. A message to stderr may be output

example run

$ my-program

> WRITE a hello

> READ a

hello

> START

> WRITE a hello-again

> READ a

hello-again

> START

> DELETE a

> READ a

Key not found: a

> COMMIT

> READ a

Key not found: a

> WRITE a once-more

> READ a

once-more

> ABORT

> READ a

hello

> QUIT

Exiting..

local execution

./gradlew run -q --console=plain

debug

add option below and connect remotely to port 5005

--debug-jvm