GenServer based key value ETS cache store with auto expiration.

This module is not recommended for production, but mostly used as an example for how to build a cache. All data is stored in-memory, so cached values are not shared between machines.

Configuration options

• :ttl - integer value in milliseconds for ttl of records. If this value is not provided, or is set to nil, the records will never expire.

• :namespace - value to use for namespacing keys. Defaults to "cache".

• :writes - set to :async to do asynchronous writes. Defaults to :sync.