Introducing transient properties in scripting API

libraries/scripting/common/src/kotlin/script/experimental/api/scriptCompilation.kt

@@ -130,17 +130,17 @@ val ScriptCompilationConfigurationKeys.compilerOptions by PropertiesCollection.k
 /**
  * The callback that will be called on the script compilation before parsing the script
  */
-val ScriptCompilationConfigurationKeys.refineConfigurationBeforeParsing by PropertiesCollection.key<List<RefineConfigurationUnconditionallyData>>()
+val ScriptCompilationConfigurationKeys.refineConfigurationBeforeParsing by PropertiesCollection.key<List<RefineConfigurationUnconditionallyData>>(isTransient = true)
 
 /**
  * The callback that will be called on the script compilation after parsing script file annotations
  */
-val ScriptCompilationConfigurationKeys.refineConfigurationOnAnnotations by PropertiesCollection.key<List<RefineConfigurationOnAnnotationsData>>()
+val ScriptCompilationConfigurationKeys.refineConfigurationOnAnnotations by PropertiesCollection.key<List<RefineConfigurationOnAnnotationsData>>(isTransient = true)
 
 /**
  * The callback that will be called on the script compilation immediately before starting the compilation
  */
-val ScriptCompilationConfigurationKeys.refineConfigurationBeforeCompiling by PropertiesCollection.key<List<RefineConfigurationUnconditionallyData>>()
+val ScriptCompilationConfigurationKeys.refineConfigurationBeforeCompiling by PropertiesCollection.key<List<RefineConfigurationUnconditionallyData>>(isTransient = true)
 
 /**
  * The list of script fragments that should be compiled intead of the whole text
@@ -151,7 +151,7 @@ val ScriptCompilationConfigurationKeys.sourceFragments by PropertiesCollection.k
 /**
  * Scripting host configuration
  */
-val ScriptCompilationConfigurationKeys.hostConfiguration by PropertiesCollection.key<ScriptingHostConfiguration>()
+val ScriptCompilationConfigurationKeys.hostConfiguration by PropertiesCollection.key<ScriptingHostConfiguration>(isTransient = true)
 
 /**
  * The sub-builder DSL for configuring refinement callbacks

libraries/scripting/common/src/kotlin/script/experimental/api/scriptEvaluation.kt

@@ -68,10 +68,10 @@ val ScriptEvaluationConfigurationKeys.constructorArgs by PropertiesCollection.ke
  * For the first snippet in a REPL an empty list should be passed explicitly
  * An array of the previous snippets will be passed to the current snippet constructor
  */
-val ScriptEvaluationConfigurationKeys.previousSnippets by PropertiesCollection.key<List<Any>>()
+val ScriptEvaluationConfigurationKeys.previousSnippets by PropertiesCollection.key<List<Any>>(isTransient = true)
 
 @Deprecated("use scriptsInstancesSharing flag instead", level = DeprecationLevel.ERROR)
-val ScriptEvaluationConfigurationKeys.scriptsInstancesSharingMap by PropertiesCollection.key<MutableMap<KClass<*>, EvaluationResult>>()
+val ScriptEvaluationConfigurationKeys.scriptsInstancesSharingMap by PropertiesCollection.key<MutableMap<KClass<*>, EvaluationResult>>(isTransient = true)
 
 /**
  * If enabled - the evaluator will try to get imported script from a shared container
@@ -83,12 +83,12 @@ val ScriptEvaluationConfigurationKeys.scriptsInstancesSharing by PropertiesColle
 /**
  * Scripting host configuration
  */
-val ScriptEvaluationConfigurationKeys.hostConfiguration by PropertiesCollection.key<ScriptingHostConfiguration>()
+val ScriptEvaluationConfigurationKeys.hostConfiguration by PropertiesCollection.key<ScriptingHostConfiguration>(isTransient = true)
 
 /**
  * The callback that will be called on the script compilation immediately before starting the compilation
  */
-val ScriptEvaluationConfigurationKeys.refineConfigurationBeforeEvaluate by PropertiesCollection.key<List<RefineEvaluationConfigurationData>>()
+val ScriptEvaluationConfigurationKeys.refineConfigurationBeforeEvaluate by PropertiesCollection.key<List<RefineEvaluationConfigurationData>>(isTransient = true)
 
 /**
  * A helper to enable scriptsInstancesSharingMap with default implementation

libraries/scripting/common/src/kotlin/script/experimental/host/hostConfiguration.kt

@@ -50,7 +50,7 @@ val ScriptingHostConfigurationKeys.configurationDependencies by PropertiesCollec
 /**
  * The pointer to the generic "class loader" for the types used in the script configurations
  */
-val ScriptingHostConfigurationKeys.getScriptingClass by PropertiesCollection.key<GetScriptingClass>()
+val ScriptingHostConfigurationKeys.getScriptingClass by PropertiesCollection.key<GetScriptingClass>(isTransient = true)
 
 /**
  * The interface to the generic "class loader" for the types used in the script configurations

libraries/scripting/common/src/kotlin/script/experimental/util/propertiesCollection.kt

@@ -5,15 +5,20 @@
 
 package kotlin.script.experimental.util
 
+import java.io.ObjectInputStream
+import java.io.ObjectOutputStream
 import java.io.Serializable
 import kotlin.reflect.KClass
 import kotlin.reflect.KProperty
 import kotlin.reflect.KType
 import kotlin.script.experimental.api.KotlinType
 
-open class PropertiesCollection(private val properties: Map<Key<*>, Any?> = emptyMap()) : Serializable {
+open class PropertiesCollection(private var properties: Map<Key<*>, Any?> = emptyMap()) : Serializable {
 
-    class Key<T>(val name: String, @Transient val getDefaultValue: PropertiesCollection.() -> T?) : Serializable {
+    open class Key<T>(
+        val name: String,
+        @Transient val getDefaultValue: PropertiesCollection.() -> T?
+    ) : Serializable {
 
         constructor(name: String, defaultValue: T? = null) : this(name, { defaultValue })
 
@@ -27,11 +32,17 @@ open class PropertiesCollection(private val properties: Map<Key<*>, Any?> = empt
         }
     }
 
-    class PropertyKeyDelegate<T>(private val getDefaultValue: PropertiesCollection.() -> T?) {
-        constructor(defaultValue: T?) : this({ defaultValue })
+    class TransientKey<T>(
+        name: String,
+        getDefaultValue: PropertiesCollection.() -> T?
+    ) : Key<T>(name, getDefaultValue)
+
+    class PropertyKeyDelegate<T>(private val getDefaultValue: PropertiesCollection.() -> T?, val isTransient: Boolean = false) {
+        constructor(defaultValue: T?, isTransient: Boolean = false) : this({ defaultValue }, isTransient)
 
         operator fun getValue(thisRef: Any?, property: KProperty<*>): Key<T> =
-            Key(property.name, getDefaultValue)
+            if (isTransient) TransientKey(property.name, getDefaultValue)
+            else Key(property.name, getDefaultValue)
     }
 
     class PropertyKeyCopyDelegate<T>(val source: Key<T>) {
@@ -51,14 +62,29 @@ open class PropertiesCollection(private val properties: Map<Key<*>, Any?> = empt
 
     fun entries(): Set<Map.Entry<Key<*>, Any?>> = properties.entries
 
+    val notTransientData: Map<Key<*>, Any?> get() = properties.filterKeys { it !is TransientKey<*>}
+
     override fun equals(other: Any?): Boolean =
         (other as? PropertiesCollection)?.let { it.properties == properties } == true
 
     override fun hashCode(): Int = properties.hashCode()
 
+    private fun writeObject(outputStream: ObjectOutputStream) {
+        outputStream.writeObject(notTransientData)
+    }
+
+    private fun readObject(inputStream: ObjectInputStream) {
+        @Suppress("UNCHECKED_CAST")
+        properties = inputStream.readObject() as Map<Key<*>, Any?>
+    }
+
     companion object {
-        fun <T> key(defaultValue: T? = null): PropertyKeyDelegate<T> = PropertyKeyDelegate(defaultValue)
-        fun <T> key(getDefaultValue: PropertiesCollection.() -> T?): PropertyKeyDelegate<T> = PropertyKeyDelegate(getDefaultValue)
+        fun <T> key(defaultValue: T? = null, isTransient: Boolean = false): PropertyKeyDelegate<T> =
+            PropertyKeyDelegate(defaultValue, isTransient)
+
+        fun <T> key(getDefaultValue: PropertiesCollection.() -> T?, isTransient: Boolean = false): PropertyKeyDelegate<T> =
+            PropertyKeyDelegate(getDefaultValue, isTransient)
+
         fun <T> keyCopy(source: Key<T>): PropertyKeyCopyDelegate<T> = PropertyKeyCopyDelegate(source)
 
         @JvmStatic