Different types hash key and field for hget and friends

[pschichtel]

Hi everyone.

I'm using JSON strings for the hash fields, while the key of the hash is a plain string.

Currently RedisHashAsyncCommands only has one type parameter K for the key type and all the hash operations use the key type K for both the key parameter as well as the field parameter.

hget for example looks like this: RedisFuture<V> hget(K key, K field).

My current workaround is to use ByteBuffer as K and to manually apply different serialization to key and field. Is there a better way to do this? Spring's redis abstractions allow to get a version of the hash commands scoped to a key that can have a different type for the fields. Something like that would work great, but I don't know how that would integrate into the current RedisCodec infrastructure, since we'd now need a third dynamic codec besides the ones for key and value.

[pschichtel]

The possibility to have everything be just ByteBuffer to be able to do all serialization/deserialization manually would also be nice.

[tishun]

See #2801

[tishun]

My current workaround is to use ByteBuffer as K and to manually apply different serialization to key and field. Is there a better way to do this?

IMHO this is the best approach, if you are consuming the Lettuce driver directly (without the use of an object mapping framework).

Spring's redis abstractions allow to get a version of the hash commands scoped to a key that can have a different type for the fields.

Can you elaborate more on this, not sure I understand you correctly.

Another possibility to have different types for a key and the field name is to follow the suggestion that @mp911de gave and use dynamic Redis command interfaces.