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Commit a25fc68d authored by Nicolo' Mazzucato's avatar Nicolo' Mazzucato
Browse files

Fix concurrentModificationException of DevicePostureController listeners 

Some listener ended up registering or unregistering other listeners while posture updates were sent. I coulnd't repro it, but we had a few reports from the field. I suspect there is a chain of calls that leads to the destruction of some objects (onDestroy) and triggers the postureController.removeListener, but only rarely.

Fix: 345390663
Test: DevicePostureControllerImplTest
Flag: NONE safe fix for rare and not reproducible exception
Change-Id: I00b5813267e917c65ca269324a9f17783069fd82
parent 2a2e0d1b

packages/SystemUI/src/com/android/systemui/statusbar/policy/DevicePostureControllerImpl.java

+8 −2
Original line number Diff line number Diff line
@@ -31,8 +31,8 @@ import com.android.systemui.util.Assert; 


import kotlin.Unit;



import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.CopyOnWriteArrayList;

import java.util.concurrent.Executor;



import javax.inject.Inject;
@@ -42,7 +42,13 @@ import javax.inject.Inject; 
public class DevicePostureControllerImpl implements DevicePostureController {

    /** From androidx.window.common.COMMON_STATE_USE_BASE_STATE */

    private static final int COMMON_STATE_USE_BASE_STATE = 1000;

    private final List<Callback> mListeners = new ArrayList<>();

    /**

     * Despite this is always used only from the main thread, it might be that some listener

     * unregisters itself while we're sending the update, ending up modifying this while we're

     * iterating it.

     * Keeping a threadsafe list of listeners helps preventing ConcurrentModificationExceptions.

     */

    private final List<Callback> mListeners = new CopyOnWriteArrayList<>();

    private final List<DeviceState> mSupportedStates;

    private DeviceState mCurrentDeviceState;

    private int mCurrentDevicePosture = DEVICE_POSTURE_UNKNOWN;