Merge "Make RotationChangeProvider Threadsafe" into main

import dagger.assisted.AssistedFactory

import dagger.assisted.AssistedInject

import java.util.concurrent.CopyOnWriteArrayList

import java.util.concurrent.atomic.AtomicInteger

private const val INVALID_ROTATION = -1

/**

 * Allows to subscribe to rotation changes. Updates are provided for the display associated to

    private val listeners = CopyOnWriteArrayList<RotationListener>()

    private val displayListener = RotationDisplayListener()

    private var lastRotation: Int? = null

    private val lastRotation = AtomicInteger(INVALID_ROTATION)

    override fun addCallback(listener: RotationListener) {

        bgHandler.post {

            listeners -= listener

            if (listeners.isEmpty()) {

                unsubscribeToRotation()

                lastRotation = null

                lastRotation.set(INVALID_ROTATION)

            }

        }

    }

                if (displayId == display.displayId) {

                    val currentRotation = display.rotation

                    if (lastRotation == null || lastRotation != currentRotation) {

                    if (lastRotation.compareAndSet(lastRotation.get(), currentRotation)) {

                        listeners.forEach { it.onRotationChanged(currentRotation) }

                        lastRotation = currentRotation

                    }

                }

            } finally {