Timeline: handle an in memory local echo to make the UI snappier

matrix-sdk-android/src/androidTest/java/im/vector/matrix/android/common/CommonTestHelper.kt

@@ -106,6 +106,10 @@ class CommonTestHelper(context: Context) {
             override fun onTimelineFailure(throwable: Throwable) {
             }
 
+            override fun onNewTimelineEvents(eventIds: List<String>) {
+                //noop
+            }
+
             override fun onTimelineUpdated(snapshot: List<TimelineEvent>) {
                 // TODO Count only new messages?
                 if (snapshot.count { it.root.type == EventType.MESSAGE } == nbOfMessages) {

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/timeline/Timeline.kt

@@ -114,7 +114,7 @@ interface Timeline {
         fun onTimelineFailure(throwable: Throwable)
 
         /**
-         * Call when new events come through the sync
+         * Called when new events come through the sync
          */
         fun onNewTimelineEvents(eventIds: List<String>)
     }

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/room/timeline/TimelineEvent.kt

@@ -36,6 +36,7 @@ import im.vector.matrix.android.internal.crypto.model.event.EncryptedEventConten
 data class TimelineEvent(
         val root: Event,
         val localId: Long,
+        val eventId: String,
         val displayIndex: Int,
         val senderName: String?,
         val isUniqueDisplayName: Boolean,

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/mapper/TimelineEventMapper.kt

@@ -37,6 +37,7 @@ internal class TimelineEventMapper @Inject constructor(private val readReceiptsS
         return TimelineEvent(
                 root = timelineEventEntity.root?.asDomain()
                         ?: Event("", timelineEventEntity.eventId),
+                eventId = timelineEventEntity.eventId,
                 annotations = timelineEventEntity.annotations?.asDomain(),
                 localId = timelineEventEntity.localId,
                 displayIndex = timelineEventEntity.displayIndex,

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/LocalEchoEventFactory.kt

@@ -56,6 +56,7 @@ import im.vector.matrix.android.internal.util.StringProvider
 import kotlinx.coroutines.launch
 import org.commonmark.parser.Parser
 import org.commonmark.renderer.html.HtmlRenderer
+import timber.log.Timber
 import javax.inject.Inject
 
 /**

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/send/LocalEchoRepository.kt

@@ -24,13 +24,17 @@ import im.vector.matrix.android.api.session.room.model.message.MessageContent
 import im.vector.matrix.android.api.session.room.model.message.MessageType
 import im.vector.matrix.android.api.session.room.send.SendState
 import im.vector.matrix.android.api.session.room.timeline.TimelineEvent
+import im.vector.matrix.android.internal.database.helper.addTimelineEvent
 import im.vector.matrix.android.internal.database.helper.nextId
+import im.vector.matrix.android.internal.database.mapper.TimelineEventMapper
 import im.vector.matrix.android.internal.database.mapper.asDomain
 import im.vector.matrix.android.internal.database.mapper.toEntity
+import im.vector.matrix.android.internal.database.model.ChunkEntity
 import im.vector.matrix.android.internal.database.model.EventEntity
 import im.vector.matrix.android.internal.database.model.RoomEntity
 import im.vector.matrix.android.internal.database.model.TimelineEventEntity
 import im.vector.matrix.android.internal.database.query.findAllInRoomWithSendStates
+import im.vector.matrix.android.internal.database.query.findLastLiveChunkFromRoom
 import im.vector.matrix.android.internal.database.query.where
 import im.vector.matrix.android.internal.session.room.RoomSummaryUpdater
 import im.vector.matrix.android.internal.session.room.membership.RoomMemberHelper
@@ -39,24 +43,27 @@ import im.vector.matrix.android.internal.util.awaitTransaction
 import io.realm.Realm
 import org.greenrobot.eventbus.EventBus
 import timber.log.Timber
+import java.lang.IllegalStateException
 import javax.inject.Inject
+import kotlin.random.Random
 
 internal class LocalEchoRepository @Inject constructor(private val monarchy: Monarchy,
                                                        private val roomSummaryUpdater: RoomSummaryUpdater,
-                                                       private val eventBus: EventBus) {
+                                                       private val eventBus: EventBus,
+                                                       private val timelineEventMapper: TimelineEventMapper) {
 
     suspend fun createLocalEcho(event: Event) {
-        val roomId = event.roomId ?: return
+        val roomId = event.roomId ?: throw IllegalStateException("You should have set a roomId for your event")
-        val senderId = event.senderId ?: return
+        val senderId = event.senderId ?: throw IllegalStateException("You should have set a senderIf for your event")
-        val eventId = event.eventId ?: return
+        if (event.eventId == null) {
-        eventBus.post(DefaultTimeline.OnNewTimelineEvents(roomId = roomId, eventIds = listOf(eventId)))
+            throw IllegalStateException("You should have set an eventId for your event")
-        monarchy.awaitTransaction { realm ->
+        }
-            val roomEntity = RoomEntity.where(realm, roomId = roomId).findFirst() ?: return@awaitTransaction
+        val timelineEventEntity = Realm.getInstance(monarchy.realmConfiguration).use { realm ->
             val eventEntity = event.toEntity(roomId, SendState.UNSENT)
             val roomMemberHelper = RoomMemberHelper(realm, roomId)
             val myUser = roomMemberHelper.getLastRoomMember(senderId)
             val localId = TimelineEventEntity.nextId(realm)
-            val timelineEventEntity = TimelineEventEntity(localId).also {
+            TimelineEventEntity(localId).also {
                 it.root = eventEntity
                 it.eventId = event.eventId
                 it.roomId = roomId
@@ -64,6 +71,11 @@ internal class LocalEchoRepository @Inject constructor(private val monarchy: Mon
                 it.senderAvatar = myUser?.avatarUrl
                 it.isUniqueDisplayName = roomMemberHelper.isUniqueDisplayName(myUser?.displayName)
             }
+        }
+        val timelineEvent = timelineEventMapper.map(timelineEventEntity)
+        eventBus.post(DefaultTimeline.OnLocalEchoCreated(roomId = roomId, timelineEvent = timelineEvent))
+        monarchy.awaitTransaction { realm ->
+            val roomEntity = RoomEntity.where(realm, roomId = roomId).findFirst() ?: return@awaitTransaction
             roomEntity.sendingTimelineEvents.add(0, timelineEventEntity)
             roomSummaryUpdater.update(realm, roomId)
         }

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/timeline/DefaultTimeline.kt

@@ -78,6 +78,7 @@ internal class DefaultTimeline(
 ) : Timeline, TimelineHiddenReadReceipts.Delegate {
 
     data class OnNewTimelineEvents(val roomId: String, val eventIds: List<String>)
+    data class OnLocalEchoCreated(val roomId: String, val timelineEvent: TimelineEvent)
 
     companion object {
         val BACKGROUND_HANDLER = createBackgroundHandler("TIMELINE_DB_THREAD")
@@ -99,6 +100,7 @@ internal class DefaultTimeline(
 
     private var prevDisplayIndex: Int? = null
     private var nextDisplayIndex: Int? = null
+    private val inMemorySendingEvents = Collections.synchronizedList<TimelineEvent>(ArrayList())
     private val builtEvents = Collections.synchronizedList<TimelineEvent>(ArrayList())
     private val builtEventsIdMap = Collections.synchronizedMap(HashMap<String, Int>())
     private val backwardsState = AtomicReference(State())
@@ -321,13 +323,24 @@ internal class DefaultTimeline(
 
     @Subscribe(threadMode = ThreadMode.MAIN)
     fun onNewTimelineEvents(onNewTimelineEvents: OnNewTimelineEvents) {
-        if (onNewTimelineEvents.roomId == roomId) {
+        if (isLive && onNewTimelineEvents.roomId == roomId) {
             listeners.forEach {
                 it.onNewTimelineEvents(onNewTimelineEvents.eventIds)
             }
         }
     }
 
+    @Subscribe(threadMode = ThreadMode.MAIN)
+    fun onLocalEchoCreated(onLocalEchoCreated: OnLocalEchoCreated) {
+        if (isLive && onLocalEchoCreated.roomId == roomId) {
+            listeners.forEach {
+                it.onNewTimelineEvents(listOf(onLocalEchoCreated.timelineEvent.eventId))
+            }
+            inMemorySendingEvents.add(0, onLocalEchoCreated.timelineEvent)
+            postSnapshot()
+        }
+    }
+
     // Private methods *****************************************************************************
 
     private fun rebuildEvent(eventId: String, builder: (TimelineEvent) -> TimelineEvent): Boolean {
@@ -394,12 +407,15 @@ internal class DefaultTimeline(
     private fun buildSendingEvents(): List<TimelineEvent> {
         val sendingEvents = ArrayList<TimelineEvent>()
         if (hasReachedEnd(Timeline.Direction.FORWARDS) && !hasMoreInCache(Timeline.Direction.FORWARDS)) {
+            sendingEvents.addAll(inMemorySendingEvents)
             roomEntity?.sendingTimelineEvents
                     ?.where()
                     ?.filterEventsWithSettings()
                     ?.findAll()
-                    ?.forEach {
+                    ?.forEach { timelineEventEntity ->
-                        sendingEvents.add(timelineEventMapper.map(it))
+                        if (sendingEvents.find { it.eventId == timelineEventEntity.eventId } == null) {
+                            sendingEvents.add(timelineEventMapper.map(timelineEventEntity))
+                        }
                     }
         }
         return sendingEvents
@@ -580,6 +596,11 @@ internal class DefaultTimeline(
         offsetResults.forEach { eventEntity ->
 
             val timelineEvent = buildTimelineEvent(eventEntity)
+            val transactionId = timelineEvent.root.unsignedData?.transactionId
+            val sendingEvent = inMemorySendingEvents.find {
+                it.eventId == transactionId
+            }
+            inMemorySendingEvents.remove(sendingEvent)
 
             if (timelineEvent.isEncrypted()
                     && timelineEvent.root.mxDecryptionResult == null) {
@@ -665,7 +686,7 @@ internal class DefaultTimeline(
                     it.onTimelineUpdated(snapshot)
                 }
             }
-            debouncer.debounce("post_snapshot", runnable, 50)
+            debouncer.debounce("post_snapshot", runnable, 1)
         }
     }
 

vector/src/main/java/im/vector/riotx/features/home/room/detail/ScrollOnNewMessageCallback.kt

@@ -21,14 +21,15 @@ import im.vector.riotx.core.platform.DefaultListUpdateCallback
 import im.vector.riotx.features.home.room.detail.timeline.TimelineEventController
 import im.vector.riotx.features.home.room.detail.timeline.item.BaseEventItem
 import timber.log.Timber
+import java.util.concurrent.CopyOnWriteArrayList
 
 class ScrollOnNewMessageCallback(private val layoutManager: LinearLayoutManager,
                                  private val timelineEventController: TimelineEventController) : DefaultListUpdateCallback {
 
-    private val newTimelineEventIds = HashSet<String>()
+    private val newTimelineEventIds = CopyOnWriteArrayList<String>()
 
     fun addNewTimelineEventIds(eventIds: List<String>) {
-        newTimelineEventIds.addAll(eventIds)
+        newTimelineEventIds.addAll(0, eventIds)
     }
 
     override fun onInserted(position: Int, count: Int) {
@@ -37,10 +38,13 @@ class ScrollOnNewMessageCallback(private val layoutManager: LinearLayoutManager,
             return
         }
         val firstNewItem = timelineEventController.adapter.getModelAtPosition(position) as? BaseEventItem ?: return
-        val firstNewItemIds = firstNewItem.getEventIds()
+        val firstNewItemIds = firstNewItem.getEventIds().firstOrNull()
-        if(newTimelineEventIds.intersect(firstNewItemIds).isNotEmpty()){
+        val indexOfFirstNewItem = newTimelineEventIds.indexOf(firstNewItemIds)
+        if (indexOfFirstNewItem != -1) {
             Timber.v("Should scroll to position: $position")
-            newTimelineEventIds.clear()
+            repeat(newTimelineEventIds.size - indexOfFirstNewItem) {
+                newTimelineEventIds.removeAt(indexOfFirstNewItem)
+            }
             layoutManager.scrollToPosition(position)
         }
     }

vector/src/main/java/im/vector/riotx/features/home/room/detail/timeline/TimelineEventController.kt

@@ -30,7 +30,6 @@ import im.vector.matrix.android.api.session.room.timeline.Timeline
 import im.vector.matrix.android.api.session.room.timeline.TimelineEvent
 import im.vector.riotx.core.date.VectorDateFormatter
 import im.vector.riotx.core.epoxy.LoadingItem_
-import im.vector.riotx.core.epoxy.emptyItem
 import im.vector.riotx.core.extensions.localDateTime
 import im.vector.riotx.features.home.room.detail.RoomDetailViewState
 import im.vector.riotx.features.home.room.detail.UnreadState
@@ -253,7 +252,7 @@ class TimelineEventController @Inject constructor(private val dateFormatter: Vec
             currentSnapshot = newSnapshot
             val diffResult = DiffUtil.calculateDiff(diffCallback)
             diffResult.dispatchUpdatesTo(listUpdateCallback)
-            requestDelayedModelBuild(100)
+            requestModelBuild()
             inSubmitList = false
         }
     }