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diff --git a/native/android/app/src/cpp/CommMMKV.cpp b/native/android/app/src/cpp/CommMMKV.cpp
--- a/native/android/app/src/cpp/CommMMKV.cpp
+++ b/native/android/app/src/cpp/CommMMKV.cpp
@@ -14,6 +14,18 @@
method(cls);
}
+ static void lock() {
+ static const auto cls = javaClassStatic();
+ static auto method = cls->getStaticMethod<void()>("lock");
+ method(cls);
+ }
+
+ static void unlock() {
+ static const auto cls = javaClassStatic();
+ static auto method = cls->getStaticMethod<void()>("unlock");
+ method(cls);
+ }
+
static void clearSensitiveData() {
static const auto cls = javaClassStatic();
static auto method = cls->getStaticMethod<void()>("clearSensitiveData");
@@ -93,6 +105,14 @@
[]() { CommMMKVJavaClass::initialize(); });
}
+CommMMKV::ScopedCommMMKVLock::ScopedCommMMKVLock() {
+ NativeAndroidAccessProvider::runTask([]() { CommMMKVJavaClass::lock(); });
+}
+
+CommMMKV::ScopedCommMMKVLock::~ScopedCommMMKVLock() {
+ NativeAndroidAccessProvider::runTask([]() { CommMMKVJavaClass::unlock(); });
+}
+
void CommMMKV::clearSensitiveData() {
NativeAndroidAccessProvider::runTask(
[]() { CommMMKVJavaClass::clearSensitiveData(); });
diff --git a/native/android/app/src/main/java/app/comm/android/fbjni/CommMMKV.java b/native/android/app/src/main/java/app/comm/android/fbjni/CommMMKV.java
--- a/native/android/app/src/main/java/app/comm/android/fbjni/CommMMKV.java
+++ b/native/android/app/src/main/java/app/comm/android/fbjni/CommMMKV.java
@@ -75,6 +75,15 @@
}
}
+ public static void lock() {
+ initialize();
+ getMMKVInstance(mmkvIdentifier, mmkvEncryptionKey).lock();
+ }
+
+ public static void unlock() {
+ getMMKVInstance(mmkvIdentifier, mmkvEncryptionKey).unlock();
+ }
+
public static void clearSensitiveData() {
initialize();
synchronized (mmkvEncryptionKey) {
diff --git a/native/cpp/CommonCpp/Tools/CommMMKV.h b/native/cpp/CommonCpp/Tools/CommMMKV.h
--- a/native/cpp/CommonCpp/Tools/CommMMKV.h
+++ b/native/cpp/CommonCpp/Tools/CommMMKV.h
@@ -31,5 +31,11 @@
public:
using std::runtime_error::runtime_error;
};
+
+ class ScopedCommMMKVLock {
+ public:
+ ScopedCommMMKVLock();
+ ~ScopedCommMMKVLock();
+ };
};
} // namespace comm
diff --git a/native/ios/Comm/CommMMKV.mm b/native/ios/Comm/CommMMKV.mm
--- a/native/ios/Comm/CommMMKV.mm
+++ b/native/ios/Comm/CommMMKV.mm
@@ -6,6 +6,18 @@
#import <Foundation/Foundation.h>
#import <MMKV.h>
+#import <MMKVCore/MMKV.h>
+
+// Core MMKV C++ implementation and Android wrapper have public `lock` and
+// `unlock` methods while Obj-C wrapper doesn't. However Obj-C wrapper has
+// private instance variable of type `mmkv::MMKV *`. Interface redeclaration
+// below lets us access it. This pattern is hacky but it is well known in
+// Obj-C and used in our codebase in CommSecureStore.
+@interface MMKV () {
+@public
+ mmkv::MMKV *m_mmkv;
+}
+@end
namespace comm {
@@ -29,6 +41,17 @@
return mmkv;
}
+CommMMKV::ScopedCommMMKVLock::ScopedCommMMKVLock() {
+ CommMMKV::initialize();
+ MMKV *mmkv = getMMKVInstance(mmkvIdentifier, mmkvEncryptionKey);
+ mmkv->m_mmkv->lock();
+}
+
+CommMMKV::ScopedCommMMKVLock::~ScopedCommMMKVLock() {
+ MMKV *mmkv = getMMKVInstance(mmkvIdentifier, mmkvEncryptionKey);
+ mmkv->m_mmkv->unlock();
+}
+
void assignInitializationData() {
std::string encryptionKey =
crypto::Tools::generateRandomString(mmkvEncryptionKeySize);

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