1 files changed, 25 insertions, 0 deletions
diff --git a/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/ObjectCleanerHelperJvm.kt b/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/ObjectCleanerHelperJvm.kt
new file mode 100644
index 0000000000..c43bc167fc
--- /dev/null
+++ b/third_party/rust/uniffi_bindgen/src/bindings/kotlin/templates/ObjectCleanerHelperJvm.kt
@@ -0,0 +1,25 @@
+private fun UniffiCleaner.Companion.create(): UniffiCleaner =
+    try {
+        // For safety's sake: if the library hasn't been run in android_cleaner = true
+        // mode, but is being run on Android, then we still need to think about
+        // Android API versions.
+        // So we check if java.lang.ref.Cleaner is there, and use that…
+        java.lang.Class.forName("java.lang.ref.Cleaner")
+        JavaLangRefCleaner()
+    } catch (e: ClassNotFoundException) {
+        // … otherwise, fallback to the JNA cleaner.
+        UniffiJnaCleaner()
+    }
+
+private class JavaLangRefCleaner : UniffiCleaner {
+    val cleaner = java.lang.ref.Cleaner.create()
+
+    override fun register(value: Any, cleanUpTask: Runnable): UniffiCleaner.Cleanable =
+        JavaLangRefCleanable(cleaner.register(value, cleanUpTask))
+}
+
+private class JavaLangRefCleanable(
+    val cleanable: java.lang.ref.Cleaner.Cleanable
+) : UniffiCleaner.Cleanable {
+    override fun clean() = cleanable.clean()
+}