Glossary

cache chooser

The ICacheChooser utility plone.memoize asks for the cache of each cached function. This package registers its own in place of the stock one.

cache key

The string plone.memoize builds from the function's dotted name and the result of its key function. Two calls with the same cache key get the same value.

circuit breaker

The mechanism that stops calling Redis for a while after a failure, so an outage costs one timeout rather than one per request.

plain data

A value built only from strings, numbers, dates, UUIDs, and lists, tuples, sets, and dictionaries of those. Only plain data is stored in Redis.

RAM cache

The process-local zope.ramcache cache stock Plone uses for @ram.cache functions.

route

Where a cached function's values go: redis, ram-excluded, or ram-not-shareable.

Valkey

An open source fork of Redis, compatible with its protocol.