Introduce SerializableValue, SerializerAwareValue

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Setting.kt

@@ -11,10 +11,12 @@
 
 package net.mamoe.mirai.console.setting
 
+import kotlinx.serialization.KSerializer
 import net.mamoe.mirai.console.setting.internal.cast
 import net.mamoe.mirai.console.setting.internal.valueFromKTypeImpl
 import net.mamoe.mirai.console.setting.internal.valueImpl
 import net.mamoe.mirai.utils.MiraiExperimentalAPI
+import java.util.*
 import kotlin.internal.LowPriorityInOverloadResolution
 import kotlin.reflect.KProperty
 import kotlin.reflect.KType
@@ -25,10 +27,12 @@ import kotlin.reflect.typeOf
 // Shows public APIs such as deciding when to auto-save.
 abstract class Setting : SettingImpl() {
 
-    operator fun <T> Value<T>.provideDelegate(thisRef: Any?, property: KProperty<*>): Value<T> {
+    operator fun <T> SerializerAwareValue<T>.provideDelegate(
+        thisRef: Any?,
+        property: KProperty<*>
+    ): SerializerAwareValue<T> {
         @Suppress("UNCHECKED_CAST")
-        valueNodes.add(Node(property as KProperty<T>, value as Value<T>, TODO()))
-        // TODO: 2020/6/21 track on
+        valueNodes.add(Node(property as KProperty<T>, this, this.serializer))
         return this
     }
 }
@@ -43,18 +47,16 @@ internal abstract class SettingImpl {
     internal class Node<T>(
         val property: KProperty<T>,
         val value: Value<T>,
-        val serializer: ValueSerializer<T>
+        val updaterSerializer: KSerializer<Unit>
     )
 
-    internal val valueNodes: MutableList<Node<*>> = kotlin.run {
-        TODO("reflection")
-    }
+    internal val valueNodes: MutableList<Node<*>> = Collections.synchronizedList(mutableListOf())
 
     /**
      * flatten
      */
     internal fun onValueChanged(value: Value<*>) {
-
+        // TODO: 2020/6/22
     }
 }
 
@@ -63,7 +65,7 @@ internal abstract class SettingImpl {
 
 // TODO: 2020/6/19 CODEGEN
 
-fun Setting.value(default: Int): IntValue = valueImpl(default)
+fun Setting.value(default: Int): SerializableValue<Int> = valueImpl(default)
 
 //// endregion Setting.value primitives CODEGEN ////
 

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/Value.kt

@@ -29,6 +29,24 @@ interface Value<T> {
     var value: T
 }
 
+/**
+ * Typically returned by [Setting.value] functions.
+ */
+class SerializableValue<T>(
+    delegate: Value<T>,
+    /**
+     * The serializer used to update and dump [delegate]
+     */
+    override val serializer: KSerializer<Unit>
+) : Value<T> by delegate, SerializerAwareValue<T>
+
+/**
+ * @see SerializableValue
+ */
+interface SerializerAwareValue<T> : Value<T> {
+    val serializer: KSerializer<Unit>
+}
+
 inline operator fun <T> Value<T>.getValue(mySetting: Any?, property: KProperty<*>): T = value
 inline operator fun <T> Value<T>.setValue(mySetting: Any?, property: KProperty<*>, value: T) {
     this.value = value

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/_Setting.value.kt

@@ -9,7 +9,8 @@
 
 package net.mamoe.mirai.console.setting.internal
 
-import net.mamoe.mirai.console.setting.IntValue
+import kotlinx.serialization.builtins.serializer
+import net.mamoe.mirai.console.setting.SerializableValue
 import net.mamoe.mirai.console.setting.Setting
 
 
@@ -17,8 +18,14 @@ import net.mamoe.mirai.console.setting.Setting
 
 // TODO: 2020/6/21 CODEGEN
 
-internal fun Setting.valueImpl(default: Int): IntValue = object : IntValueImpl(default) {
-    override fun onChanged() = this@valueImpl.onValueChanged(this)
+internal fun Setting.valueImpl(default: Int): SerializableValue<Int> {
+    val instance = object : IntValueImpl(default) {
+        override fun onChanged() = this@valueImpl.onValueChanged(this)
+    }
+    return SerializableValue(instance, Int.serializer().map(
+        serializer = { instance.value },
+        deserializer = { instance.value = it }
+    ))
 }
 
 //// endregion Setting.value primitives impl CODEGEN ////

backend/mirai-console/src/main/kotlin/net/mamoe/mirai/console/setting/internal/serializerUtil.kt

@@ -13,8 +13,6 @@ import kotlinx.serialization.*
 import kotlin.reflect.KProperty
 import kotlin.reflect.full.findAnnotation
 
-internal object SettingSerializerMark
-
 internal val KProperty<*>.serialNameOrPropertyName: String get() = this.findAnnotation<SerialName>()?.value ?: this.name
 
 internal inline fun <E> KSerializer<E>.bind(