KT-28460 Implement SafePublicationLazyImpl w/o final field for JDK9+
diff --git a/libraries/stdlib/jvm/java9/kotlin/SafePublicationLazyImpl.java b/libraries/stdlib/jvm/java9/kotlin/SafePublicationLazyImpl.java
new file mode 100644
index 0000000..61b80ce
--- /dev/null
+++ b/libraries/stdlib/jvm/java9/kotlin/SafePublicationLazyImpl.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2010-2023 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 kotlin;
+
+import java.io.Serializable;
+import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
+import java.lang.invoke.VarHandle;
+import kotlin.jvm.functions.Function0;
+import kotlin.jvm.internal.Intrinsics;
+
+public class SafePublicationLazyImpl<T> implements Serializable, Lazy<T> {
+ private static final AtomicReferenceFieldUpdater<SafePublicationLazyImpl, Object> valueUpdater =
+ AtomicReferenceFieldUpdater.newUpdater(SafePublicationLazyImpl.class, Object.class, "_value");
+
+ private volatile Function0<? extends T> initializer;
+ private volatile Object _value;
+
+ public SafePublicationLazyImpl(Function0<? extends T> init) {
+ Intrinsics.checkNotNullParameter(init, "initializer");
+ initializer = init;
+ _value = UNINITIALIZED_VALUE.INSTANCE;
+ VarHandle.releaseFence();
+ }
+
+ public T getValue() {
+ Object value = _value;
+ if (value != UNINITIALIZED_VALUE.INSTANCE) {
+ @SuppressWarnings("unchecked")
+ T vc = (T) value;
+ return vc;
+ }
+
+ Function0<? extends T> init = initializer;
+ if (init != null) {
+ @SuppressWarnings("unchecked")
+ T newValue = init.invoke();
+ if (valueUpdater.compareAndSet(this, UNINITIALIZED_VALUE.INSTANCE, newValue)) {
+ initializer = null;
+ return newValue;
+ }
+ }
+ @SuppressWarnings("unchecked")
+ T vc = (T) _value;
+ return vc;
+ }
+
+ public boolean isInitialized() {
+ return _value != UNINITIALIZED_VALUE.INSTANCE;
+ }
+
+ public String toString() {
+ if (isInitialized()) {
+ return getValue().toString();
+ }
+ return "Lazy value not initialized yet.";
+ }
+}
