How to Efficiently Parse SQS Event Message using Kotlin - amazon-web-services

Question

I have SQS Queue that send Batch Event to Lambda
Now I want to get body from each message from Record Event
Following code I implemented in Kotlin but can't optimize it furthur , also there are warnings.
Event Data is similar to - Example Amazon SQS message event (standard queue)
https://docs.aws.amazon.com/lambda/latest/dg/with-sqs.html
Any pointers will be appreciated :
class ApplicationHandler (
private val mapper: ObjectMapper = ApplicationModule.mapper
override fun handleRequest(input: Any, context: Context) {
val eventList: List<Event<*>> = parseEvent(input) // Passing whole input
for(event in eventList) {
when (event.type) {
*** do some code ***
}
}
}
}
private fun parseEvent(input: Any): List<Event<*>> {
val eventString: List<String> = when (input) {
// Iterating each message in Record as KeyValue Pair
is Map<*, *> -> {
val records = input["Records"] as List<Map<String, Any>>
records.map { it["body"] as String }
}
else -> throw IllegalArgumentException("Unexpected event type received: ${input.javaClass} [$input]")
}
return eventString.map { mapper.readValue(it,Event::class.java) }
}
}
Event.class:
data class Event<T>(
val id: String,
val time: Instant? = null,
val type: String
}