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package kotlinx.benchmarks.json
import kotlinx.serialization.*
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.descriptors.buildClassSerialDescriptor
import kotlinx.serialization.descriptors.element
import kotlinx.serialization.encoding.*
import kotlinx.serialization.json.*
import kotlinx.serialization.modules.*
import org.openjdk.jmh.annotations.*
import java.util.concurrent.*
@Warmup(iterations = 7, time = 1)
@Measurement(iterations = 5, time = 1)
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
@State(Scope.Benchmark)
@Fork(1)
open class ContextualOverheadBenchmark {
@Serializable
data class Holder(val data: @Contextual Data)
class Data(val a: Int, val b: String)
object DataSerializer: KSerializer<Data> {
override val descriptor: SerialDescriptor = buildClassSerialDescriptor("Serializer") {
element<Int>("a")
element<String>("b")
}
override fun deserialize(decoder: Decoder): Data {
return decoder.decodeStructure(descriptor) {
var a = 0
var b = ""
while (true) {
when (val index = decodeElementIndex(descriptor)) {
0 -> a = decodeIntElement(descriptor, 0)
1 -> b = decodeStringElement(descriptor, 1)
CompositeDecoder.DECODE_DONE -> break
else -> error("Unexpected index: $index")
}
}
Data(a, b)
}
}
override fun serialize(encoder: Encoder, value: Data) {
encoder.encodeStructure(descriptor) {
encodeIntElement(descriptor, 0, value.a)
encodeStringElement(descriptor, 1, value.b)
}
}
}
private val module = SerializersModule {
contextual(DataSerializer)
}
private val json = Json { serializersModule = module }
private val holder = Holder(Data(1, "abc"))
private val holderString = json.encodeToString(holder)
private val holderSerializer = serializer<Holder>()
@Benchmark
fun decode() = json.decodeFromString(holderSerializer, holderString)
@Benchmark
fun encode() = json.encodeToString(holderSerializer, holder)
}
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