Unregister the tethering internal callback in finalize
Bug: 177265744
Bug: 191798390
Bug: 187972579
Test: atest TetheringServiceTest
Change-Id: Ie7f9535b923db5073a59329ead22546a54e6ef47
diff --git a/Tethering/common/TetheringLib/src/android/net/TetheringManager.java b/Tethering/common/TetheringLib/src/android/net/TetheringManager.java
index 3086da2..4387ab0 100644
--- a/Tethering/common/TetheringLib/src/android/net/TetheringManager.java
+++ b/Tethering/common/TetheringLib/src/android/net/TetheringManager.java
@@ -290,6 +290,23 @@
getConnector(c -> c.registerTetheringEventCallback(mCallback, pkgName));
}
+ /** @hide */
+ @Override
+ protected void finalize() throws Throwable {
+ final String pkgName = mContext.getOpPackageName();
+ Log.i(TAG, "unregisterTetheringEventCallback:" + pkgName);
+ // 1. It's generally not recommended to perform long operations in finalize, but while
+ // unregisterTetheringEventCallback does an IPC, it's a oneway IPC so should not block.
+ // 2. If the connector is not yet connected, TetheringManager is impossible to finalize
+ // because the connector polling thread strong reference the TetheringManager object. So
+ // it's guaranteed that registerTetheringEventCallback was already called before calling
+ // unregisterTetheringEventCallback in finalize.
+ if (mConnector == null) Log.wtf(TAG, "null connector in finalize!");
+ getConnector(c -> c.unregisterTetheringEventCallback(mCallback, pkgName));
+
+ super.finalize();
+ }
+
private void startPollingForConnector() {
new Thread(() -> {
while (true) {
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringServiceTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringServiceTest.java
index b7f5872..f664d5d 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringServiceTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringServiceTest.java
@@ -577,8 +577,7 @@
assertNull("TetheringManager weak reference still not null after " + attempts
+ " attempts", weakTm.get());
- // BUG: internal callback do not be unregistered after TetheringManager is GCed.
- assertEquals(1, callbacks.size());
+ assertEquals("Internal callback is not unregistered", 0, callbacks.size());
});
}
}