[Gradle] Implement TestIdeaKotlinDependencySerializer

KT-54825

libraries/tools/kotlin-gradle-plugin-idea/src/testFixtures/kotlin/org/jetbrains/kotlin/gradle/idea/testFixtures/tcs/TestIdeaKotlinDependencySerializer.kt

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.gradle.idea.testFixtures.tcs
+
+import org.jetbrains.kotlin.gradle.idea.proto.tcs.IdeaKotlinDependency
+import org.jetbrains.kotlin.gradle.idea.proto.tcs.toByteArray
+import org.jetbrains.kotlin.gradle.idea.tcs.IdeaKotlinDependency
+import org.jetbrains.kotlin.gradle.idea.testFixtures.serialize.TestIdeaKotlinSerializationContext
+import org.jetbrains.kotlin.gradle.idea.testFixtures.serialize.TestIdeaKotlinSerializationLogger
+import org.jetbrains.kotlin.gradle.idea.testFixtures.utils.copy
+import org.jetbrains.kotlin.tooling.core.UnsafeApi
+import java.lang.reflect.InvocationHandler
+import java.lang.reflect.Method
+import java.lang.reflect.Proxy
+import kotlin.reflect.full.primaryConstructor
+import kotlin.reflect.jvm.javaGetter
+import kotlin.reflect.jvm.javaMethod
+
+interface TestIdeaKotlinDependencySerializer {
+    val classLoader: ClassLoader
+    val reports: List<TestIdeaKotlinSerializationLogger.Report>
+    fun serialize(dependency: Any): ByteArray
+    fun deserialize(data: ByteArray): Any?
+}
+
+@OptIn(UnsafeApi::class)
+fun TestIdeaKotlinDependencySerializer(): TestIdeaKotlinDependencySerializer =
+    TestIdeaKotlinDependencySerializer(TestIdeaKotlinDependencySerializer::class.java.classLoader)
+
+
+@OptIn(UnsafeApi::class)
+fun TestIdeaKotlinDependencySerializer(classLoader: ClassLoader): TestIdeaKotlinDependencySerializer {
+    /*
+    Instantiates the `TestIdeaKotlinDependencySerializer` in the previous version of the classes
+    (using the specified classLoader). A java proxy will be used to bridge this implementation and the return type interface
+     */
+    val serializerInstance = classLoader.loadClass(TestIdeaClassLoaderKotlinDependencySerializer::class.java.name)
+        .kotlin.primaryConstructor?.call(classLoader) ?: error(
+        "Failed to construct ${TestIdeaKotlinDependencySerializer::class.java.name} in $classLoader"
+    )
+
+    return Proxy.newProxyInstance(
+        /* loader = */ TestIdeaKotlinDependencySerializer::class.java.classLoader,
+        /* interfaces = */ arrayOf(TestIdeaKotlinDependencySerializer::class.java),
+        /* h = */ ProxyInvocationHandler(classLoader, serializerInstance)
+    ) as TestIdeaKotlinDependencySerializer
+}
+
+
+@UnsafeApi
+internal class TestIdeaClassLoaderKotlinDependencySerializer(
+    override val classLoader: ClassLoader
+) : TestIdeaKotlinDependencySerializer {
+    private val context = TestIdeaKotlinSerializationContext()
+
+    override val reports: List<TestIdeaKotlinSerializationLogger.Report>
+        get() = context.logger.reports
+
+    override fun serialize(dependency: Any): ByteArray {
+        return (dependency as IdeaKotlinDependency).toByteArray(context)
+    }
+
+    override fun deserialize(data: ByteArray): Any? {
+        return context.IdeaKotlinDependency(data)
+    }
+}
+
+
+private class ProxyInvocationHandler(
+    private val classLoader: ClassLoader,
+    private val serializerInstance: Any
+) : InvocationHandler {
+    override fun invoke(proxy: Any, method: Method, args: Array<out Any>?): Any? {
+        if (method == TestIdeaKotlinDependencySerializer::classLoader.getter.javaMethod) {
+            return classLoader
+        }
+
+        val targetMethod = serializerInstance.javaClass.methods.find { it.name == method.name } ?: error("Missing $method")
+        val result = targetMethod.invoke(serializerInstance, *args.orEmpty())
+
+        /*
+        The result objects here are also part of the test-fixtures, which will have different classes, depending on the
+        ClassLoader being used. The reports here, will be copied (serialized and then deserialized in this ClassLoader).
+        */
+        if (method == TestIdeaKotlinDependencySerializer::reports.javaGetter) {
+            /* Copy into 'our' ClassLoader */
+            return result?.copy()
+        }
+
+        return result
+    }
+}