Initial commit 🎉

fbshipit-source-id: b6fc29740c6875d2e78953b8a7123890a67930f2
Co-authored-by: Sebastian McKenzie <sebmck@fb.com>
Co-authored-by: John Knox <jknox@fb.com>
Co-authored-by: Emil Sjölander <emilsj@fb.com>
Co-authored-by: Pritesh Nandgaonkar <prit91@fb.com>

libs/fbjni/src/main/cpp/jni/WeakReference.cpp

@@ -0,0 +1,41 @@
+/*
+ *  Copyright (c) 2015-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+#include <fb/Environment.h>
+#include <jni/WeakReference.h>
+
+namespace facebook {
+namespace jni {
+
+WeakReference::WeakReference(jobject strongRef) :
+  m_weakReference(Environment::current()->NewWeakGlobalRef(strongRef))
+{
+}
+
+WeakReference::~WeakReference() {
+  auto env = Environment::current();
+  FBASSERTMSGF(env, "Attempt to delete jni::WeakReference from non-JNI thread");
+  env->DeleteWeakGlobalRef(m_weakReference);
+}
+
+ResolvedWeakReference::ResolvedWeakReference(jobject weakRef) :
+  m_strongReference(Environment::current()->NewLocalRef(weakRef))
+{
+}
+
+ResolvedWeakReference::ResolvedWeakReference(const RefPtr<WeakReference>& weakRef) :
+  m_strongReference(Environment::current()->NewLocalRef(weakRef->weakRef()))
+{
+}
+
+ResolvedWeakReference::~ResolvedWeakReference() {
+  if (m_strongReference)
+    Environment::current()->DeleteLocalRef(m_strongReference);
+}
+
+} }
+