How can I ensure T has Serializable and call serializer

Question

Marc Knaup · Answer

You can t Serializers can be created for any types even if they aren t ` Serializable` Why do you need them to be of a specific type The library uses `SerialModule` for registering additional serializers at runtime

Alex Spence · Answer

I guess I m not understanding how to get a serializer instance from T

Alex Spence · Answer

And also pass json parse lt T gt I get an error because the type is refied

Alex Spence · Answer

I would like to convert this code to a generic Serde lt T gt

Alex Spence · Answer

```class QueryRequestSerde Serde lt QueryRequest gt override fun configure configs MutableMap lt String gt isKey Boolean override fun deserializer Deserializer lt T gt = QueryRequestDeSerializer override fun close override fun serializer Serializer lt QueryRequest gt = QueryRequestSerializer class QueryRequestDeSerializer Deserializer lt QueryRequest gt private val json = Json JsonConfiguration Stable override fun configure configs MutableMap lt String gt isKey Boolean ImplicitReflectionSerializer override fun deserialize topic String data ByteArray T return if data = null json parse QueryRequest serializer data toString Charsets UTF 8 else null override fun close class QueryRequestSerializer Serializer lt QueryRequest gt override fun configure configs MutableMap lt String gt isKey Boolean ImplicitReflectionSerializer override fun serialize topic String data QueryRequest ByteArray return if data = null json stringify QueryRequest serializer toByteArray Charsets UTF 8 else null override fun close private val json = Json JsonConfiguration Stable ```

Marc Knaup · Answer

It `T` is ` Serializable` and not generic then you can use `T class serializer ` That means you need the `KClass` of `T`

Marc Knaup · Answer

Then you call ` stringify ` with both the serializer and the instance to serialize

Marc Knaup · Answer

So when you create an instance of `YourGenericSerde` you ll likely have to pass the `KClass lt T gt ` to it because you have no other way of accessing it

Marc Knaup · Answer

Even better would be to pass `KSerializer` directly for more flexibility and you wouldn t have to rely on reflection which btw only works on the JVM

Alex Spence · Answer

``` Serializable data class QueryRequest val metrics List lt MetricQueryRequest gt companion object val serde = JsonSerde serializer data class MetricQueryRequest val metricDefinition String val parameters Map lt String gt class JsonSerde lt T gt private val serializer KSerializer lt T gt Serde lt T gt private val json = Json JsonConfiguration Stable override fun deserializer Deserializer lt T gt = JsonDeserializer override fun serializer Serializer lt T gt = JsonSerializer override fun configure configs MutableMap lt String gt isKey Boolean override fun close inner class JsonDeserializer Deserializer lt T gt ImplicitReflectionSerializer override fun deserialize topic String data ByteArray T return if data = null json parse serializer data toString Charsets UTF 8 else null override fun close override fun configure configs MutableMap lt String gt isKey Boolean inner class JsonSerializer Serializer lt T gt override fun serialize topic String data T ByteArray return if data = null json stringify serializer data toByteArray Charsets UTF 8 else null override fun configure configs MutableMap lt String gt isKey Boolean override fun close ```

Alex Spence · Answer

Looks like it will work thanks for the help