CODEWITHSUNDEEP
javamongodbscalascala-macros
python_kaa
python_kaa

Reputation: 1096

Combining mongodb codec registries in scala

I have two CodecRegistry implementation for a set of case classes. Most of them are created with macros. Now if I use the RegistryOne only, it works for set "One" - the classes from package one.

object RegistryOne {
  lazy val registry: CodecRegistry =
    fromRegistries(
      fromCodecs(..),
      fromProviders(..),
      DEFAULT_CODEC_REGISTRY
    )
}

object RegistryTwo {
  lazy val registry: CodecRegistry =
    fromRegistries(
      fromCodecs(..),
      fromProviders(..),
      RegistryOne.registry,
      DEFAULT_CODEC_REGISTRY
    )
}

Some of classes implemented in RegistryTwo are depending on package one. So I just included the RegistryOne into it. Now all serialization still works with RegistryTwo.registry for set "One". But for the classes of package two I get a runtime exceptions "Can't find a codec for class scala.Option". Seems like the DEFAULT_CODEC_REGISTRY is not included in resulted registry?!

I have also RegistryThree and RegistryFour. At least for clarity and for future refactorings I would hold them separately.

How to combine the codec registries properly?

Upvotes: 1

Views: 238

Answers (1)

python_kaa
python_kaa

Reputation: 1096

Turns out the error message is misleading. The macro for ADT main class also creates codecs for each subclass. If you also add a macro-created codec for one of them then the registry is confused and can't deserialize primitive things like scala.Option.

Upvotes: 1

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