# `Lotus.Cache.ETS`
[🔗](https://github.com/elixir-lotus/lotus/blob/v1.3.0/lib/lotus/cache/ets.ex#L1)

An ETS-based, local, in-memory cache adapter for Lotus.

This is the default cache adapter if none is specified.

## In a cluster

Every node keeps its own entries and its own tag bookkeeping. `scope/1`
returns `:node` for both relayed operations, so `Lotus.Cache` relays each
`delete/1` and `invalidate_tags/1` to the other nodes over
`Lotus.Notifier`, and each node drops its own copies. Values are not
shared: two nodes that run the same query each fill their own entry. Use
`Lotus.Cache.Cachex` with a router when one entry should serve the whole
cluster.

## Tag bookkeeping

Each tag row carries the expiry of the entry it points at. The janitor
that sweeps expired entries every 30 seconds sweeps expired tag rows the
same way, so a tag that is never invalidated does not grow for the life
of the node.

# `child_spec`

Returns a specification to start this module under a supervisor.

See `Supervisor`.

# `decode`

# `encode`

# `start_link`

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*Consult [api-reference.md](api-reference.md) for complete listing*