thread list loading (#7766)

changelog.d/5819.misc

@@ -0,0 +1 @@
+[Threads] - added API to fetch threads list from the server instead of building it locally from events

matrix-sdk-android-flow/src/main/java/org/matrix/android/sdk/flow/FlowRoom.kt

@@ -31,7 +31,6 @@ import org.matrix.android.sdk.api.session.room.model.RoomMemberSummary
 import org.matrix.android.sdk.api.session.room.model.RoomSummary
 import org.matrix.android.sdk.api.session.room.notification.RoomNotificationState
 import org.matrix.android.sdk.api.session.room.send.UserDraft
-import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
 import org.matrix.android.sdk.api.session.room.timeline.TimelineEvent
 import org.matrix.android.sdk.api.util.Optional
 import org.matrix.android.sdk.api.util.toOptional
@@ -119,13 +118,6 @@ class FlowRoom(private val room: Room) {
         return room.roomPushRuleService().getLiveRoomNotificationState().asFlow()
     }
 
-    fun liveThreadSummaries(): Flow<List<ThreadSummary>> {
-        return room.threadsService().getAllThreadSummariesLive().asFlow()
-                .startWith(room.coroutineDispatchers.io) {
-                    room.threadsService().getAllThreadSummaries()
-                }
-    }
-
     fun liveThreadList(): Flow<List<ThreadRootEvent>> {
         return room.threadsLocalService().getAllThreadsLive().asFlow()
                 .startWith(room.coroutineDispatchers.io) {

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/threads/FetchThreadsResult.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2022 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.api.session.room.threads
+
+sealed class FetchThreadsResult {
+    data class ShouldFetchMore(val nextBatch: String) : FetchThreadsResult()
+    object ReachedEnd : FetchThreadsResult()
+    object Failed : FetchThreadsResult()
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/threads/ThreadFilter.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2022 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.api.session.room.threads
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+@JsonClass(generateAdapter = false)
+enum class ThreadFilter {
+    @Json(name = "all") ALL,
+    @Json(name = "participated") PARTICIPATED,
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/threads/ThreadLivePageResult.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2021 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.api.session.room.threads
+
+import androidx.lifecycle.LiveData
+import androidx.paging.PagedList
+import org.matrix.android.sdk.api.session.room.ResultBoundaries
+import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
+
+data class ThreadLivePageResult(
+        val livePagedList: LiveData<PagedList<ThreadSummary>>,
+        val liveBoundaries: LiveData<ResultBoundaries>
+)

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/session/room/threads/ThreadsService.kt

@@ -16,7 +16,7 @@
 
 package org.matrix.android.sdk.api.session.room.threads
 
-import androidx.lifecycle.LiveData
+import androidx.paging.PagedList
 import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
 
 /**
@@ -27,15 +27,14 @@ import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
  */
 interface ThreadsService {
 
-    /**
-     * Returns a [LiveData] list of all the [ThreadSummary] that exists at the room level.
-     */
-    fun getAllThreadSummariesLive(): LiveData<List<ThreadSummary>>
+    suspend fun getPagedThreadsList(userParticipating: Boolean, pagedListConfig: PagedList.Config): ThreadLivePageResult
+
+    suspend fun fetchThreadList(nextBatchId: String?, limit: Int, filter: ThreadFilter = ThreadFilter.ALL): FetchThreadsResult
 
     /**
      * Returns a list of all the [ThreadSummary] that exists at the room level.
      */
-    fun getAllThreadSummaries(): List<ThreadSummary>
+    suspend fun getAllThreadSummaries(): List<ThreadSummary>
 
     /**
      * Enhance the provided ThreadSummary[List] by adding the latest
@@ -51,9 +50,4 @@ interface ThreadsService {
      * @param limit defines the number of max results the api will respond with
      */
     suspend fun fetchThreadTimeline(rootThreadEventId: String, from: String, limit: Int)
-
-    /**
-     * Fetch all thread summaries for the current room using the enhanced /messages api.
-     */
-    suspend fun fetchThreadSummaries()
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt

@@ -62,6 +62,7 @@ import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo042
 import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo043
 import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo044
 import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo045
+import org.matrix.android.sdk.internal.database.migration.MigrateSessionTo046
 import org.matrix.android.sdk.internal.util.Normalizer
 import org.matrix.android.sdk.internal.util.database.MatrixRealmMigration
 import javax.inject.Inject
@@ -70,7 +71,7 @@ internal class RealmSessionStoreMigration @Inject constructor(
         private val normalizer: Normalizer
 ) : MatrixRealmMigration(
         dbName = "Session",
-        schemaVersion = 45L,
+        schemaVersion = 46L,
 ) {
     /**
      * Forces all RealmSessionStoreMigration instances to be equal.
@@ -125,5 +126,6 @@ internal class RealmSessionStoreMigration @Inject constructor(
         if (oldVersion < 43) MigrateSessionTo043(realm).perform()
         if (oldVersion < 44) MigrateSessionTo044(realm).perform()
         if (oldVersion < 45) MigrateSessionTo045(realm).perform()
+        if (oldVersion < 46) MigrateSessionTo046(realm).perform()
     }
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/helper/ThreadSummaryHelper.kt

@@ -37,9 +37,11 @@ import org.matrix.android.sdk.internal.database.model.EventEntity
 import org.matrix.android.sdk.internal.database.model.EventInsertType
 import org.matrix.android.sdk.internal.database.model.RoomEntity
 import org.matrix.android.sdk.internal.database.model.TimelineEventEntity
+import org.matrix.android.sdk.internal.database.model.threads.ThreadListPageEntity
 import org.matrix.android.sdk.internal.database.model.threads.ThreadSummaryEntity
 import org.matrix.android.sdk.internal.database.model.threads.ThreadSummaryEntityFields
 import org.matrix.android.sdk.internal.database.query.copyToRealmOrIgnore
+import org.matrix.android.sdk.internal.database.query.get
 import org.matrix.android.sdk.internal.database.query.getOrCreate
 import org.matrix.android.sdk.internal.database.query.getOrNull
 import org.matrix.android.sdk.internal.database.query.where
@@ -113,16 +115,16 @@ internal fun ThreadSummaryEntity.Companion.createOrUpdate(
         userId: String,
         cryptoService: CryptoService? = null,
         currentTimeMillis: Long,
-) {
+): ThreadSummaryEntity? {
     when (threadSummaryType) {
         ThreadSummaryUpdateType.REPLACE -> {
-            rootThreadEvent?.eventId ?: return
-            rootThreadEvent.senderId ?: return
+            rootThreadEvent?.eventId ?: return null
+            rootThreadEvent.senderId ?: return null
 
-            val numberOfThreads = rootThreadEvent.unsignedData?.relations?.latestThread?.count ?: return
+            val numberOfThreads = rootThreadEvent.unsignedData?.relations?.latestThread?.count ?: return null
 
             // Something is wrong with the server return
-            if (numberOfThreads <= 0) return
+            if (numberOfThreads <= 0) return null
 
             val threadSummary = ThreadSummaryEntity.getOrCreate(realm, roomId, rootThreadEvent.eventId).also {
                 Timber.i("###THREADS ThreadSummaryHelper REPLACE eventId:${it.rootThreadEventId} ")
@@ -153,12 +155,13 @@ internal fun ThreadSummaryEntity.Companion.createOrUpdate(
             )
 
             roomEntity.addIfNecessary(threadSummary)
+            return threadSummary
         }
         ThreadSummaryUpdateType.ADD -> {
-            val rootThreadEventId = threadEventEntity?.rootThreadEventId ?: return
+            val rootThreadEventId = threadEventEntity?.rootThreadEventId ?: return null
             Timber.i("###THREADS ThreadSummaryHelper ADD for root eventId:$rootThreadEventId")
 
-            val threadSummary = ThreadSummaryEntity.getOrNull(realm, roomId, rootThreadEventId)
+            var threadSummary = ThreadSummaryEntity.getOrNull(realm, roomId, rootThreadEventId)
             if (threadSummary != null) {
                 // ThreadSummary exists so lets add the latest event
                 Timber.i("###THREADS ThreadSummaryHelper ADD root eventId:$rootThreadEventId exists, lets update latest thread event.")
@@ -172,7 +175,7 @@ internal fun ThreadSummaryEntity.Companion.createOrUpdate(
                 Timber.i("###THREADS ThreadSummaryHelper ADD root eventId:$rootThreadEventId do not exists, lets try to create one")
                 threadEventEntity.findRootThreadEvent()?.let { rootThreadEventEntity ->
                     // Root thread event entity exists so lets create a new record
-                    ThreadSummaryEntity.getOrCreate(realm, roomId, rootThreadEventEntity.eventId).let {
+                    threadSummary = ThreadSummaryEntity.getOrCreate(realm, roomId, rootThreadEventEntity.eventId).also {
                         it.updateThreadSummary(
                                 rootThreadEventEntity = rootThreadEventEntity,
                                 numberOfThreads = 1,
@@ -183,8 +186,13 @@ internal fun ThreadSummaryEntity.Companion.createOrUpdate(
                         roomEntity.addIfNecessary(it)
                     }
                 }
+
+                threadSummary?.let {
+                    ThreadListPageEntity.get(realm, roomId)?.threadSummaries?.add(it)
                 }
             }
+            return threadSummary
+        }
     }
 }
 

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/migration/MigrateSessionTo046.kt

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2022 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.database.migration
+
+import io.realm.DynamicRealm
+import org.matrix.android.sdk.internal.database.model.threads.ThreadListPageEntityFields
+import org.matrix.android.sdk.internal.util.database.RealmMigrator
+
+internal class MigrateSessionTo046(realm: DynamicRealm) : RealmMigrator(realm, 46) {
+
+    override fun doMigrate(realm: DynamicRealm) {
+        realm.schema.create("ThreadListPageEntity")
+                .addField(ThreadListPageEntityFields.ROOM_ID, String::class.java)
+                .addPrimaryKey(ThreadListPageEntityFields.ROOM_ID)
+                .setRequired(ThreadListPageEntityFields.ROOM_ID, true)
+                .addRealmListField(ThreadListPageEntityFields.THREAD_SUMMARIES.`$`, realm.schema.get("ThreadSummaryEntity")!!)
+    }
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/model/SessionRealmModule.kt

@@ -19,6 +19,7 @@ package org.matrix.android.sdk.internal.database.model
 import io.realm.annotations.RealmModule
 import org.matrix.android.sdk.internal.database.model.livelocation.LiveLocationShareAggregatedSummaryEntity
 import org.matrix.android.sdk.internal.database.model.presence.UserPresenceEntity
+import org.matrix.android.sdk.internal.database.model.threads.ThreadListPageEntity
 import org.matrix.android.sdk.internal.database.model.threads.ThreadSummaryEntity
 
 /**
@@ -72,6 +73,7 @@ import org.matrix.android.sdk.internal.database.model.threads.ThreadSummaryEntit
             UserPresenceEntity::class,
             ThreadSummaryEntity::class,
             SyncFilterParamsEntity::class,
+            ThreadListPageEntity::class
         ]
 )
 internal class SessionRealmModule

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/model/threads/ThreadListPageEntity.kt

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2022 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.database.model.threads
+
+import io.realm.RealmList
+import io.realm.RealmObject
+import io.realm.annotations.PrimaryKey
+
+internal open class ThreadListPageEntity(
+        @PrimaryKey var roomId: String = "",
+        var threadSummaries: RealmList<ThreadSummaryEntity> = RealmList()
+) : RealmObject() {
+    companion object
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/model/threads/ThreadSummaryEntity.kt

@@ -40,5 +40,8 @@ internal open class ThreadSummaryEntity(
     @LinkingObjects("threadSummaries")
     val room: RealmResults<RoomEntity>? = null
 
+    @LinkingObjects("threadSummaries")
+    val page: RealmResults<ThreadListPageEntity>? = null
+
     companion object
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/query/ThreadSummaryPageEntityQueries.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2022 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.matrix.android.sdk.internal.database.query
+
+import io.realm.Realm
+import io.realm.kotlin.createObject
+import io.realm.kotlin.where
+import org.matrix.android.sdk.internal.database.model.threads.ThreadListPageEntity
+import org.matrix.android.sdk.internal.database.model.threads.ThreadListPageEntityFields
+
+internal fun ThreadListPageEntity.Companion.get(realm: Realm, roomId: String): ThreadListPageEntity? {
+    return realm.where<ThreadListPageEntity>().equalTo(ThreadListPageEntityFields.ROOM_ID, roomId).findFirst()
+}
+
+internal fun ThreadListPageEntity.Companion.getOrCreate(realm: Realm, roomId: String): ThreadListPageEntity {
+    return get(realm, roomId) ?: realm.createObject(roomId)
+}

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/RoomAPI.kt

@@ -35,6 +35,7 @@ import org.matrix.android.sdk.internal.session.room.membership.joining.InviteBod
 import org.matrix.android.sdk.internal.session.room.membership.threepid.ThreePidInviteBody
 import org.matrix.android.sdk.internal.session.room.read.ReadBody
 import org.matrix.android.sdk.internal.session.room.relation.RelationsResponse
+import org.matrix.android.sdk.internal.session.room.relation.threads.ThreadSummariesResponse
 import org.matrix.android.sdk.internal.session.room.reporting.ReportContentBody
 import org.matrix.android.sdk.internal.session.room.send.SendResponse
 import org.matrix.android.sdk.internal.session.room.tags.TagBody
@@ -464,4 +465,12 @@ internal interface RoomAPI {
             @Path("roomIdOrAlias") roomidOrAlias: String,
             @Query("via") viaServers: List<String>?
     ): RoomStrippedState
+
+    @GET(NetworkConstants.URI_API_PREFIX_PATH_V1 + "rooms/{roomId}/threads")
+    suspend fun getThreadsList(
+            @Path("roomId") roomId: String,
+            @Query("include") include: String? = "all",
+            @Query("from") from: String? = null,
+            @Query("limit") limit: Int? = null
+    ): ThreadSummariesResponse
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/relation/threads/FetchThreadSummariesTask.kt

@@ -16,37 +16,38 @@
 package org.matrix.android.sdk.internal.session.room.relation.threads
 
 import com.zhuinden.monarchy.Monarchy
+import io.realm.RealmList
 import org.matrix.android.sdk.api.session.room.model.RoomMemberContent
+import org.matrix.android.sdk.api.session.room.threads.FetchThreadsResult
+import org.matrix.android.sdk.api.session.room.threads.ThreadFilter
 import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummaryUpdateType
 import org.matrix.android.sdk.internal.crypto.DefaultCryptoService
 import org.matrix.android.sdk.internal.database.helper.createOrUpdate
 import org.matrix.android.sdk.internal.database.model.RoomEntity
+import org.matrix.android.sdk.internal.database.model.threads.ThreadListPageEntity
 import org.matrix.android.sdk.internal.database.model.threads.ThreadSummaryEntity
+import org.matrix.android.sdk.internal.database.query.getOrCreate
 import org.matrix.android.sdk.internal.database.query.where
 import org.matrix.android.sdk.internal.di.SessionDatabase
 import org.matrix.android.sdk.internal.di.UserId
 import org.matrix.android.sdk.internal.network.GlobalErrorReceiver
 import org.matrix.android.sdk.internal.network.executeRequest
-import org.matrix.android.sdk.internal.session.filter.FilterFactory
 import org.matrix.android.sdk.internal.session.room.RoomAPI
-import org.matrix.android.sdk.internal.session.room.timeline.PaginationDirection
-import org.matrix.android.sdk.internal.session.room.timeline.PaginationResponse
 import org.matrix.android.sdk.internal.task.Task
 import org.matrix.android.sdk.internal.util.awaitTransaction
 import org.matrix.android.sdk.internal.util.time.Clock
-import timber.log.Timber
 import javax.inject.Inject
 
 /***
  * This class is responsible to Fetch all the thread in the current room,
  * To fetch all threads in a room, the /messages API is used with newly added filtering options.
  */
-internal interface FetchThreadSummariesTask : Task<FetchThreadSummariesTask.Params, DefaultFetchThreadSummariesTask.Result> {
+internal interface FetchThreadSummariesTask : Task<FetchThreadSummariesTask.Params, FetchThreadsResult> {
     data class Params(
             val roomId: String,
-            val from: String = "",
-            val limit: Int = 500,
-            val isUserParticipating: Boolean = true
+            val from: String? = null,
+            val limit: Int = 5,
+            val filter: ThreadFilter? = null,
     )
 }
 
@@ -59,39 +60,43 @@ internal class DefaultFetchThreadSummariesTask @Inject constructor(
         private val clock: Clock,
 ) : FetchThreadSummariesTask {
 
-    override suspend fun execute(params: FetchThreadSummariesTask.Params): Result {
-        val filter = FilterFactory.createThreadsFilter(
-                numberOfEvents = params.limit,
-                userId = if (params.isUserParticipating) userId else null
-        ).toJSONString()
-
-        val response = executeRequest(
-                globalErrorReceiver,
-                canRetry = true
-        ) {
-            roomAPI.getRoomMessagesFrom(params.roomId, params.from, PaginationDirection.BACKWARDS.value, params.limit, filter)
+    override suspend fun execute(params: FetchThreadSummariesTask.Params): FetchThreadsResult {
+        val response = executeRequest(globalErrorReceiver) {
+            roomAPI.getThreadsList(
+                    roomId = params.roomId,
+                    include = params.filter?.toString()?.lowercase(),
+                    from = params.from,
+                    limit = params.limit
+            )
         }
 
-        Timber.i("###THREADS DefaultFetchThreadSummariesTask Fetched size:${response.events.size} nextBatch:${response.end} ")
+        handleResponse(response, params)
 
-        return handleResponse(response, params)
+        return when {
+            response.nextBatch != null -> FetchThreadsResult.ShouldFetchMore(response.nextBatch)
+            else -> FetchThreadsResult.ReachedEnd
+        }
     }
 
     private suspend fun handleResponse(
-            response: PaginationResponse,
+            response: ThreadSummariesResponse,
             params: FetchThreadSummariesTask.Params
-    ): Result {
-        val rootThreadList = response.events
+    ) {
+        val rootThreadList = response.chunk
+
+        val threadSummaries = RealmList<ThreadSummaryEntity>()
+
         monarchy.awaitTransaction { realm ->
             val roomEntity = RoomEntity.where(realm, roomId = params.roomId).findFirst() ?: return@awaitTransaction
 
             val roomMemberContentsByUser = HashMap<String, RoomMemberContent?>()
+
             for (rootThreadEvent in rootThreadList) {
                 if (rootThreadEvent.eventId == null || rootThreadEvent.senderId == null || rootThreadEvent.type == null) {
                     continue
                 }
 
-                ThreadSummaryEntity.createOrUpdate(
+                val threadSummary = ThreadSummaryEntity.createOrUpdate(
                         threadSummaryType = ThreadSummaryUpdateType.REPLACE,
                         realm = realm,
                         roomId = params.roomId,
@@ -102,14 +107,16 @@ internal class DefaultFetchThreadSummariesTask @Inject constructor(
                         cryptoService = cryptoService,
                         currentTimeMillis = clock.epochMillis(),
                 )
-            }
-        }
-        return Result.SUCCESS
+
+                threadSummaries.add(threadSummary)
             }
 
-    enum class Result {
-        SHOULD_FETCH_MORE,
-        REACHED_END,
-        SUCCESS
+            val page = ThreadListPageEntity.getOrCreate(realm, params.roomId)
+            threadSummaries.forEach {
+                if (!page.threadSummaries.contains(it)) {
+                    page.threadSummaries.add(it)
+                }
+            }
+        }
     }
 }

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/relation/threads/ThreadSummariesResponse.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2022 The Matrix.org Foundation C.I.C.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.matrix.android.sdk.internal.session.room.relation.threads
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+import org.matrix.android.sdk.api.session.events.model.Event
+
+@JsonClass(generateAdapter = true)
+internal data class ThreadSummariesResponse(
+        @Json(name = "chunk") val chunk: List<Event>,
+        @Json(name = "next_batch") val nextBatch: String?,
+        @Json(name = "prev_batch") val prevBatch: String?
+)

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/threads/DefaultThreadsService.kt

@@ -16,32 +16,39 @@
 
 package org.matrix.android.sdk.internal.session.room.threads
 
-import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.paging.LivePagedListBuilder
+import androidx.paging.PagedList
 import com.zhuinden.monarchy.Monarchy
 import dagger.assisted.Assisted
 import dagger.assisted.AssistedFactory
 import dagger.assisted.AssistedInject
 import io.realm.Realm
+import io.realm.Sort
+import io.realm.kotlin.where
+import org.matrix.android.sdk.api.session.room.ResultBoundaries
+import org.matrix.android.sdk.api.session.room.threads.FetchThreadsResult
+import org.matrix.android.sdk.api.session.room.threads.ThreadFilter
+import org.matrix.android.sdk.api.session.room.threads.ThreadLivePageResult
 import org.matrix.android.sdk.api.session.room.threads.ThreadsService
 import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
 import org.matrix.android.sdk.internal.database.helper.enhanceWithEditions
 import org.matrix.android.sdk.internal.database.helper.findAllThreadsForRoomId
 import org.matrix.android.sdk.internal.database.mapper.ThreadSummaryMapper
-import org.matrix.android.sdk.internal.database.mapper.TimelineEventMapper
+import org.matrix.android.sdk.internal.database.model.threads.ThreadListPageEntity
 import org.matrix.android.sdk.internal.database.model.threads.ThreadSummaryEntity
+import org.matrix.android.sdk.internal.database.model.threads.ThreadSummaryEntityFields
 import org.matrix.android.sdk.internal.di.SessionDatabase
-import org.matrix.android.sdk.internal.di.UserId
 import org.matrix.android.sdk.internal.session.room.relation.threads.FetchThreadSummariesTask
 import org.matrix.android.sdk.internal.session.room.relation.threads.FetchThreadTimelineTask
+import org.matrix.android.sdk.internal.util.awaitTransaction
 
 internal class DefaultThreadsService @AssistedInject constructor(
         @Assisted private val roomId: String,
-        @UserId private val userId: String,
         private val fetchThreadTimelineTask: FetchThreadTimelineTask,
-        private val fetchThreadSummariesTask: FetchThreadSummariesTask,
         @SessionDatabase private val monarchy: Monarchy,
-        private val timelineEventMapper: TimelineEventMapper,
-        private val threadSummaryMapper: ThreadSummaryMapper
+        private val threadSummaryMapper: ThreadSummaryMapper,
+        private val fetchThreadSummariesTask: FetchThreadSummariesTask,
 ) : ThreadsService {
 
     @AssistedFactory
@@ -49,16 +56,58 @@ internal class DefaultThreadsService @AssistedInject constructor(
         fun create(roomId: String): DefaultThreadsService
     }
 
-    override fun getAllThreadSummariesLive(): LiveData<List<ThreadSummary>> {
-        return monarchy.findAllMappedWithChanges(
-                { ThreadSummaryEntity.findAllThreadsForRoomId(it, roomId = roomId) },
-                {
+    override suspend fun getPagedThreadsList(userParticipating: Boolean, pagedListConfig: PagedList.Config): ThreadLivePageResult {
+        monarchy.awaitTransaction { realm ->
+            realm.where<ThreadListPageEntity>().findAll().deleteAllFromRealm()
+        }
+
+        val realmDataSourceFactory = monarchy.createDataSourceFactory { realm ->
+            realm
+                    .where<ThreadSummaryEntity>().equalTo(ThreadSummaryEntityFields.PAGE.ROOM_ID, roomId)
+                    .sort(ThreadSummaryEntityFields.LATEST_THREAD_EVENT_ENTITY.ORIGIN_SERVER_TS, Sort.DESCENDING)
+        }
+
+        val dataSourceFactory = realmDataSourceFactory.map {
             threadSummaryMapper.map(it)
         }
+
+        val boundaries = MutableLiveData(ResultBoundaries())
+
+        val builder = LivePagedListBuilder(dataSourceFactory, pagedListConfig).also {
+            it.setBoundaryCallback(object : PagedList.BoundaryCallback<ThreadSummary>() {
+                override fun onItemAtEndLoaded(itemAtEnd: ThreadSummary) {
+                    boundaries.postValue(boundaries.value?.copy(endLoaded = true))
+                }
+
+                override fun onItemAtFrontLoaded(itemAtFront: ThreadSummary) {
+                    boundaries.postValue(boundaries.value?.copy(frontLoaded = true))
+                }
+
+                override fun onZeroItemsLoaded() {
+                    boundaries.postValue(boundaries.value?.copy(zeroItemLoaded = true))
+                }
+            })
+        }
+
+        val livePagedList = monarchy.findAllPagedWithChanges(
+                realmDataSourceFactory,
+                builder
+        )
+        return ThreadLivePageResult(livePagedList, boundaries)
+    }
+
+    override suspend fun fetchThreadList(nextBatchId: String?, limit: Int, filter: ThreadFilter): FetchThreadsResult {
+        return fetchThreadSummariesTask.execute(
+                FetchThreadSummariesTask.Params(
+                        roomId = roomId,
+                        from = nextBatchId,
+                        limit = limit,
+                        filter = filter
+                )
         )
     }
 
-    override fun getAllThreadSummaries(): List<ThreadSummary> {
+    override suspend fun getAllThreadSummaries(): List<ThreadSummary> {
         return monarchy.fetchAllMappedSync(
                 { ThreadSummaryEntity.findAllThreadsForRoomId(it, roomId = roomId) },
                 { threadSummaryMapper.map(it) }
@@ -81,12 +130,4 @@ internal class DefaultThreadsService @AssistedInject constructor(
                 )
         )
     }
-
-    override suspend fun fetchThreadSummaries() {
-        fetchThreadSummariesTask.execute(
-                FetchThreadSummariesTask.Params(
-                        roomId = roomId
-                )
-        )
-    }
 }

vector/src/main/java/im/vector/app/features/home/room/threads/list/viewmodel/ThreadListController.kt

@@ -19,24 +19,18 @@ package im.vector.app.features.home.room.threads.list.viewmodel
 import com.airbnb.epoxy.EpoxyController
 import im.vector.app.core.date.DateFormatKind
 import im.vector.app.core.date.VectorDateFormatter
-import im.vector.app.core.resources.StringProvider
 import im.vector.app.features.home.AvatarRenderer
 import im.vector.app.features.home.room.detail.timeline.format.DisplayableEventFormatter
 import im.vector.app.features.home.room.threads.list.model.threadListItem
-import org.matrix.android.sdk.api.session.Session
-import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
 import org.matrix.android.sdk.api.session.room.timeline.TimelineEvent
 import org.matrix.android.sdk.api.session.threads.ThreadNotificationState
 import org.matrix.android.sdk.api.util.toMatrixItem
-import org.matrix.android.sdk.api.util.toMatrixItemOrNull
 import javax.inject.Inject
 
 class ThreadListController @Inject constructor(
         private val avatarRenderer: AvatarRenderer,
-        private val stringProvider: StringProvider,
         private val dateFormatter: VectorDateFormatter,
         private val displayableEventFormatter: DisplayableEventFormatter,
-        private val session: Session
 ) : EpoxyController() {
 
     var listener: Listener? = null
@@ -48,64 +42,7 @@ class ThreadListController @Inject constructor(
         requestModelBuild()
     }
 
-    override fun buildModels() =
-            when (session.homeServerCapabilitiesService().getHomeServerCapabilities().canUseThreading) {
-                true -> buildThreadSummaries()
-                false -> buildThreadList()
-            }
-
-    /**
-     * Building thread summaries when homeserver supports threading.
-     */
-    private fun buildThreadSummaries() {
-        val safeViewState = viewState ?: return
-        val host = this
-        safeViewState.threadSummaryList.invoke()
-                ?.filter {
-                    if (safeViewState.shouldFilterThreads) {
-                        it.isUserParticipating
-                    } else {
-                        true
-                    }
-                }
-                ?.forEach { threadSummary ->
-                    val date = dateFormatter.format(threadSummary.latestEvent?.originServerTs, DateFormatKind.ROOM_LIST)
-                    val lastMessageFormatted = threadSummary.let {
-                        displayableEventFormatter.formatThreadSummary(
-                                event = it.latestEvent,
-                                latestEdition = it.threadEditions.latestThreadEdition
-                        ).toString()
-                    }
-                    val rootMessageFormatted = threadSummary.let {
-                        displayableEventFormatter.formatThreadSummary(
-                                event = it.rootEvent,
-                                latestEdition = it.threadEditions.rootThreadEdition
-                        ).toString()
-                    }
-                    threadListItem {
-                        id(threadSummary.rootEvent?.eventId)
-                        avatarRenderer(host.avatarRenderer)
-                        matrixItem(threadSummary.rootThreadSenderInfo.toMatrixItem())
-                        title(threadSummary.rootThreadSenderInfo.displayName.orEmpty())
-                        date(date)
-                        rootMessageDeleted(threadSummary.rootEvent?.isRedacted() ?: false)
-                        // TODO refactor notifications that with the new thread summary
-                        threadNotificationState(threadSummary.rootEvent?.threadDetails?.threadNotificationState ?: ThreadNotificationState.NO_NEW_MESSAGE)
-                        rootMessage(rootMessageFormatted)
-                        lastMessage(lastMessageFormatted)
-                        lastMessageCounter(threadSummary.numberOfThreads.toString())
-                        lastMessageMatrixItem(threadSummary.latestThreadSenderInfo.toMatrixItemOrNull())
-                        itemClickListener {
-                            host.listener?.onThreadSummaryClicked(threadSummary)
-                        }
-                    }
-                }
-    }
-
-    /**
-     * Building local thread list when homeserver do not support threading.
-     */
-    private fun buildThreadList() {
+    override fun buildModels() {
         val safeViewState = viewState ?: return
         val host = this
         safeViewState.rootThreadEventList.invoke()
@@ -152,7 +89,6 @@ class ThreadListController @Inject constructor(
     }
 
     interface Listener {
-        fun onThreadSummaryClicked(threadSummary: ThreadSummary)
         fun onThreadListClicked(timelineEvent: TimelineEvent)
     }
 }

vector/src/main/java/im/vector/app/features/home/room/threads/list/viewmodel/ThreadListPagedController.kt

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2021 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.home.room.threads.list.viewmodel
+
+import com.airbnb.epoxy.EpoxyModel
+import com.airbnb.epoxy.paging.PagedListEpoxyController
+import im.vector.app.core.date.DateFormatKind
+import im.vector.app.core.date.VectorDateFormatter
+import im.vector.app.core.utils.createUIHandler
+import im.vector.app.features.home.AvatarRenderer
+import im.vector.app.features.home.room.detail.timeline.format.DisplayableEventFormatter
+import im.vector.app.features.home.room.threads.list.model.ThreadListItem_
+import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
+import org.matrix.android.sdk.api.session.threads.ThreadNotificationState
+import org.matrix.android.sdk.api.util.toMatrixItem
+import org.matrix.android.sdk.api.util.toMatrixItemOrNull
+import javax.inject.Inject
+
+class ThreadListPagedController @Inject constructor(
+        private val avatarRenderer: AvatarRenderer,
+        private val dateFormatter: VectorDateFormatter,
+        private val displayableEventFormatter: DisplayableEventFormatter,
+) : PagedListEpoxyController<ThreadSummary>(
+        // Important it must match the PageList builder notify Looper
+        modelBuildingHandler = createUIHandler()
+) {
+
+    var listener: Listener? = null
+
+    override fun buildItemModel(currentPosition: Int, item: ThreadSummary?): EpoxyModel<*> {
+        if (item == null) {
+            throw java.lang.NullPointerException()
+        }
+        val host = this
+        val date = dateFormatter.format(item.latestEvent?.originServerTs, DateFormatKind.ROOM_LIST)
+        val lastMessageFormatted = item.let {
+            displayableEventFormatter.formatThreadSummary(
+                    event = it.latestEvent,
+                    latestEdition = it.threadEditions.latestThreadEdition
+            ).toString()
+        }
+        val rootMessageFormatted = item.let {
+            displayableEventFormatter.formatThreadSummary(
+                    event = it.rootEvent,
+                    latestEdition = it.threadEditions.rootThreadEdition
+            ).toString()
+        }
+
+        return ThreadListItem_()
+                .id(item.rootEvent?.eventId)
+                .avatarRenderer(host.avatarRenderer)
+                .matrixItem(item.rootThreadSenderInfo.toMatrixItem())
+                .title(item.rootThreadSenderInfo.displayName.orEmpty())
+                .date(date)
+                .rootMessageDeleted(item.rootEvent?.isRedacted() ?: false)
+                // TODO refactor notifications that with the new thread summary
+                .threadNotificationState(item.rootEvent?.threadDetails?.threadNotificationState ?: ThreadNotificationState.NO_NEW_MESSAGE)
+                .rootMessage(rootMessageFormatted)
+                .lastMessage(lastMessageFormatted)
+                .lastMessageCounter(item.numberOfThreads.toString())
+                .lastMessageMatrixItem(item.latestThreadSenderInfo.toMatrixItemOrNull())
+                .itemClickListener {
+                    host.listener?.onThreadSummaryClicked(item)
+                }
+    }
+
+    interface Listener {
+        fun onThreadSummaryClicked(threadSummary: ThreadSummary)
+    }
+}

vector/src/main/java/im/vector/app/features/home/room/threads/list/viewmodel/ThreadListViewModel.kt

@@ -16,6 +16,11 @@
 
 package im.vector.app.features.home.room.threads.list.viewmodel
 
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.Observer
+import androidx.lifecycle.asFlow
+import androidx.paging.PagedList
 import com.airbnb.mvrx.FragmentViewModelContext
 import com.airbnb.mvrx.MavericksViewModelFactory
 import com.airbnb.mvrx.ViewModelContext
@@ -29,23 +34,47 @@ import im.vector.app.features.analytics.AnalyticsTracker
 import im.vector.app.features.analytics.extensions.toAnalyticsInteraction
 import im.vector.app.features.analytics.plan.Interaction
 import im.vector.app.features.home.room.threads.list.views.ThreadListFragment
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.flowOn
+import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import org.matrix.android.sdk.api.session.Session
 import org.matrix.android.sdk.api.session.getRoom
+import org.matrix.android.sdk.api.session.room.threads.FetchThreadsResult
+import org.matrix.android.sdk.api.session.room.threads.ThreadFilter
+import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
 import org.matrix.android.sdk.api.session.threads.ThreadTimelineEvent
 import org.matrix.android.sdk.flow.flow
 
 class ThreadListViewModel @AssistedInject constructor(
         @Assisted val initialState: ThreadListViewState,
         private val analyticsTracker: AnalyticsTracker,
-        private val session: Session
-) :
-        VectorViewModel<ThreadListViewState, EmptyAction, EmptyViewEvents>(initialState) {
+        private val session: Session,
+) : VectorViewModel<ThreadListViewState, EmptyAction, EmptyViewEvents>(initialState) {
 
     private val room = session.getRoom(initialState.roomId)
 
+    private val defaultPagedListConfig = PagedList.Config.Builder()
+            .setPageSize(20)
+            .setInitialLoadSizeHint(40)
+            .setEnablePlaceholders(false)
+            .setPrefetchDistance(10)
+            .build()
+
+    private var nextBatchId: String? = null
+    private var hasReachedEnd: Boolean = false
+    private var boundariesJob: Job? = null
+
+    private var livePagedList: LiveData<PagedList<ThreadSummary>>? = null
+    private val _threadsLivePagedList = MutableLiveData<PagedList<ThreadSummary>>()
+    val threadsLivePagedList: LiveData<PagedList<ThreadSummary>> = _threadsLivePagedList
+    private val internalPagedListObserver = Observer<PagedList<ThreadSummary>> {
+        _threadsLivePagedList.postValue(it)
+        setLoading(false)
+    }
+
     @AssistedFactory
     interface Factory {
         fun create(initialState: ThreadListViewState): ThreadListViewModel
@@ -54,7 +83,7 @@ class ThreadListViewModel @AssistedInject constructor(
     companion object : MavericksViewModelFactory<ThreadListViewModel, ThreadListViewState> {
 
         @JvmStatic
-        override fun create(viewModelContext: ViewModelContext, state: ThreadListViewState): ThreadListViewModel? {
+        override fun create(viewModelContext: ViewModelContext, state: ThreadListViewState): ThreadListViewModel {
             val fragment: ThreadListFragment = (viewModelContext as FragmentViewModelContext).fragment()
             return fragment.threadListViewModelFactory.create(state)
         }
@@ -72,7 +101,7 @@ class ThreadListViewModel @AssistedInject constructor(
     private fun fetchAndObserveThreads() {
         when (session.homeServerCapabilitiesService().getHomeServerCapabilities().canUseThreading) {
             true -> {
-                fetchThreadList()
+                setLoading(true)
                 observeThreadSummaries()
             }
             false -> observeThreadsList()
@@ -82,13 +111,32 @@ class ThreadListViewModel @AssistedInject constructor(
     /**
      * Observing thread summaries when homeserver support threading.
      */
-    private fun observeThreadSummaries() {
-        room?.flow()
-                ?.liveThreadSummaries()
-                ?.map { room.threadsService().enhanceThreadWithEditions(it) }
-                ?.flowOn(room.coroutineDispatchers.io)
-                ?.execute { asyncThreads ->
-                    copy(threadSummaryList = asyncThreads)
+    private fun observeThreadSummaries() = withState { state ->
+        viewModelScope.launch {
+            nextBatchId = null
+            hasReachedEnd = false
+
+            livePagedList?.removeObserver(internalPagedListObserver)
+
+            room?.threadsService()
+                    ?.getPagedThreadsList(state.shouldFilterThreads, defaultPagedListConfig)?.let { result ->
+                        livePagedList = result.livePagedList
+
+                        livePagedList?.observeForever(internalPagedListObserver)
+
+                        boundariesJob = result.liveBoundaries.asFlow()
+                                .onEach {
+                                    if (it.endLoaded) {
+                                        if (!hasReachedEnd) {
+                                            fetchNextPage()
+                                        }
+                                    }
+                                }
+                                .launchIn(viewModelScope)
+                    }
+
+            setLoading(true)
+            fetchNextPage()
         }
     }
 
@@ -111,14 +159,6 @@ class ThreadListViewModel @AssistedInject constructor(
                 }
     }
 
-    private fun fetchThreadList() {
-        viewModelScope.launch {
-            setLoading(true)
-            room?.threadsService()?.fetchThreadSummaries()
-            setLoading(false)
-        }
-    }
-
     private fun setLoading(isLoading: Boolean) {
         setState {
             copy(isLoading = isLoading)
@@ -132,5 +172,30 @@ class ThreadListViewModel @AssistedInject constructor(
         setState {
             copy(shouldFilterThreads = shouldFilterThreads)
         }
+
+        fetchAndObserveThreads()
+    }
+
+    private suspend fun fetchNextPage() {
+        val filter = when (awaitState().shouldFilterThreads) {
+            true -> ThreadFilter.PARTICIPATED
+            false -> ThreadFilter.ALL
+        }
+        room?.threadsService()?.fetchThreadList(
+                nextBatchId = nextBatchId,
+                limit = defaultPagedListConfig.pageSize,
+                filter = filter,
+        ).let { result ->
+            when (result) {
+                is FetchThreadsResult.ReachedEnd -> {
+                    hasReachedEnd = true
+                }
+                is FetchThreadsResult.ShouldFetchMore -> {
+                    nextBatchId = result.nextBatch
+                }
+                else -> {
+                }
+            }
+        }
     }
 }

vector/src/main/java/im/vector/app/features/home/room/threads/list/viewmodel/ThreadListViewState.kt

@@ -20,11 +20,9 @@ import com.airbnb.mvrx.Async
 import com.airbnb.mvrx.MavericksState
 import com.airbnb.mvrx.Uninitialized
 import im.vector.app.features.home.room.threads.arguments.ThreadListArgs
-import org.matrix.android.sdk.api.session.room.threads.model.ThreadSummary
 import org.matrix.android.sdk.api.session.threads.ThreadTimelineEvent
 
 data class ThreadListViewState(
-        val threadSummaryList: Async<List<ThreadSummary>> = Uninitialized,
         val rootThreadEventList: Async<List<ThreadTimelineEvent>> = Uninitialized,
         val shouldFilterThreads: Boolean = false,
         val isLoading: Boolean = false,

vector/src/main/java/im/vector/app/features/home/room/threads/list/views/ThreadListFragment.kt

@@ -40,6 +40,7 @@ import im.vector.app.features.home.room.threads.ThreadsActivity
 import im.vector.app.features.home.room.threads.arguments.ThreadListArgs
 import im.vector.app.features.home.room.threads.arguments.ThreadTimelineArgs
 import im.vector.app.features.home.room.threads.list.viewmodel.ThreadListController
+import im.vector.app.features.home.room.threads.list.viewmodel.ThreadListPagedController
 import im.vector.app.features.home.room.threads.list.viewmodel.ThreadListViewModel
 import im.vector.app.features.home.room.threads.list.viewmodel.ThreadListViewState
 import im.vector.app.features.rageshake.BugReporter
@@ -52,12 +53,14 @@ import javax.inject.Inject
 @AndroidEntryPoint
 class ThreadListFragment :
         VectorBaseFragment<FragmentThreadListBinding>(),
+        ThreadListPagedController.Listener,
         ThreadListController.Listener,
         VectorMenuProvider {
 
     @Inject lateinit var avatarRenderer: AvatarRenderer
     @Inject lateinit var bugReporter: BugReporter
-    @Inject lateinit var threadListController: ThreadListController
+    @Inject lateinit var threadListController: ThreadListPagedController
+    @Inject lateinit var legacyThreadListController: ThreadListController
     @Inject lateinit var threadListViewModelFactory: ThreadListViewModel.Factory
 
     private val threadListViewModel: ThreadListViewModel by fragmentViewModel()
@@ -100,7 +103,7 @@ class ThreadListFragment :
             val filterBadge = filterIcon.findViewById<View>(R.id.threadListFilterBadge)
             filterBadge.isVisible = state.shouldFilterThreads
             when (threadListViewModel.canHomeserverUseThreading()) {
-                true -> menu.findItem(R.id.menu_thread_list_filter).isVisible = !state.threadSummaryList.invoke().isNullOrEmpty()
+                true -> menu.findItem(R.id.menu_thread_list_filter).isVisible = true
                 false -> menu.findItem(R.id.menu_thread_list_filter).isVisible = !state.rootThreadEventList.invoke().isNullOrEmpty()
             }
         }
@@ -111,8 +114,18 @@ class ThreadListFragment :
         initToolbar()
         initTextConstants()
         initBetaFeedback()
+
+        if (threadListViewModel.canHomeserverUseThreading()) {
             views.threadListRecyclerView.configureWith(threadListController, TimelineItemAnimator(), hasFixedSize = false)
             threadListController.listener = this
+
+            threadListViewModel.threadsLivePagedList.observe(viewLifecycleOwner) { threadsList ->
+                threadListController.submitList(threadsList)
+            }
+        } else {
+            views.threadListRecyclerView.configureWith(legacyThreadListController, TimelineItemAnimator(), hasFixedSize = false)
+            legacyThreadListController.listener = this
+        }
     }
 
     override fun onDestroyView() {
@@ -144,7 +157,9 @@ class ThreadListFragment :
     override fun invalidate() = withState(threadListViewModel) { state ->
         invalidateOptionsMenu()
         renderEmptyStateIfNeeded(state)
-        threadListController.update(state)
+        if (!threadListViewModel.canHomeserverUseThreading()) {
+            legacyThreadListController.update(state)
+        }
         renderLoaderIfNeeded(state)
     }
 
@@ -185,7 +200,7 @@ class ThreadListFragment :
 
     private fun renderEmptyStateIfNeeded(state: ThreadListViewState) {
         when (threadListViewModel.canHomeserverUseThreading()) {
-            true -> views.threadListEmptyConstraintLayout.isVisible = state.threadSummaryList.invoke().isNullOrEmpty()
+            true -> views.threadListEmptyConstraintLayout.isVisible = false
             false -> views.threadListEmptyConstraintLayout.isVisible = state.rootThreadEventList.invoke().isNullOrEmpty()
         }
     }