John Roesler created KAFKA-7918:
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Summary: Streams store cleanup: inline byte-store generic
parameters
Key: KAFKA-7918
URL: https://issues.apache.org/jira/browse/KAFKA-7918
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: John Roesler
Currently, the fundamental layer of stores in Streams is the "bytes store".
The easiest way to identify this is in `org.apache.kafka.streams.state.Stores`,
all the `StoreBuilder`s require a `XXBytesStoreSupplier`.
We provide several implementations of these bytes stores, typically an
in-memory one and a persistent one (aka RocksDB).
Inside these bytes stores, the key is always `Bytes` and the value is always
`byte[]` (serialization happens at a higher level). However, the store
implementations are generically typed, just `K` and `V`.
This is good for flexibility, but it makes the code a little harder to
understand. I think that we used to do serialization at a lower level, so the
generics are a hold-over from that.
It would simplify the code if we just inlined the actual k/v types and maybe
even renamed the classes from (e.g.) `InMemoryKeyValueStore<K,V>` to
`InMemoryKeyValueBytesStore`, and so forth.
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