Start to insert room summaries and listen for changes

app/build.gradle

@@ -28,6 +28,8 @@ dependencies {
     implementation 'com.android.support:appcompat-v7:28.0.0'
     implementation 'com.android.support.constraint:constraint-layout:1.1.3'
 
+    implementation 'com.jakewharton.timber:timber:4.7.1'
+
     implementation "org.koin:koin-android:$koin_version"
     implementation "org.koin:koin-android-scope:$koin_version"
     implementation "org.koin:koin-android-viewmodel:$koin_version"

app/src/main/java/im/vector/riotredesign/Riot.kt

@@ -1,13 +1,18 @@
 package im.vector.riotredesign
 
 import android.app.Application
+import im.vector.matrix.android.BuildConfig
 import im.vector.riotredesign.core.di.AppModule
 import org.koin.standalone.StandAloneContext.startKoin
+import timber.log.Timber
 
 class Riot : Application() {
 
     override fun onCreate() {
         super.onCreate()
+        if (BuildConfig.DEBUG) {
+            Timber.plant(Timber.DebugTree())
+        }
         startKoin(listOf(AppModule(this)))
     }
 

app/src/main/java/im/vector/riotredesign/features/home/HomeActivity.kt

@@ -4,24 +4,22 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import android.view.View
-import android.widget.Toast
 import im.vector.matrix.android.api.Matrix
 import im.vector.matrix.android.api.MatrixCallback
 import im.vector.matrix.android.api.failure.Failure
-import im.vector.matrix.android.internal.database.model.EventEntity
+import im.vector.matrix.android.internal.database.model.RoomSummaryEntity
 import im.vector.matrix.android.internal.events.sync.data.SyncResponse
 import im.vector.riotredesign.R
 import im.vector.riotredesign.core.platform.RiotActivity
-import io.realm.RealmChangeListener
-import io.realm.RealmResults
 import kotlinx.android.synthetic.main.activity_home.*
 import org.koin.android.ext.android.inject
+import timber.log.Timber
 
 class HomeActivity : RiotActivity() {
 
     private val matrix by inject<Matrix>()
     private val synchronizer = matrix.currentSession?.synchronizer()
-    private val realmHolder = matrix.currentSession?.realmInstanceHolder()
+    private val realmHolder = matrix.currentSession?.realmHolder()
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -33,24 +31,24 @@ class HomeActivity : RiotActivity() {
         synchronizeButton.visibility = View.GONE
         loadingView.visibility = View.VISIBLE
         synchronizer?.synchronize(object : MatrixCallback<SyncResponse> {
-            override fun onSuccess(data: SyncResponse?) {
+            override fun onSuccess(data: SyncResponse) {
                 synchronizeButton.visibility = View.VISIBLE
                 loadingView.visibility = View.GONE
+                Timber.v("Sync successful")
             }
 
             override fun onFailure(failure: Failure) {
                 synchronizeButton.visibility = View.VISIBLE
                 loadingView.visibility = View.GONE
-                Toast.makeText(this@HomeActivity, failure.toString(), Toast.LENGTH_LONG).show()
+                Timber.e("Sync has failed : %s", failure.toString())
             }
         })
         if (realmHolder != null) {
-            val results = realmHolder.realm.where(EventEntity::class.java).equalTo("chunk.room.roomId", "!UlckfcnwgLKswCmUbe:matrix.org").findAll()
+            val results = realmHolder.instance.where(RoomSummaryEntity::class.java).findAll()
-            results.addChangeListener(RealmChangeListener<RealmResults<EventEntity>> {
+            results.addChangeListener { summaries ->
-                Toast.makeText(this@HomeActivity, "Room events data changed", Toast.LENGTH_LONG).show()
+                Timber.v("Summaries updated")
-            })
+            }
         }
-
 
     }
 

app/src/main/java/im/vector/riotredesign/features/login/LoginActivity.kt

@@ -22,8 +22,8 @@ class LoginActivity : RiotActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_login)
-        authenticateButton.setOnClickListener { authenticate() }
         checkActiveSessions()
+        authenticateButton.setOnClickListener { authenticate() }
     }
 
     private fun authenticate() {
@@ -37,9 +37,8 @@ class LoginActivity : RiotActivity() {
                 .build()
 
         authenticator.authenticate(homeServerConnectionConfig, login, password, object : MatrixCallback<Session> {
-            override fun onSuccess(data: Session?) {
+            override fun onSuccess(data: Session) {
-                matrix.currentSession = data
+                openSessionAndGoToHome(data)
-                goToHomeScreen()
             }
 
             override fun onFailure(failure: Failure) {
@@ -51,12 +50,16 @@ class LoginActivity : RiotActivity() {
 
     private fun checkActiveSessions() {
         if (authenticator.hasActiveSessions()) {
-            matrix.currentSession = authenticator.getLastActiveSession()
+            val session = authenticator.getLastActiveSession()
-            goToHomeScreen()
+            session?.let {
+                openSessionAndGoToHome(it)
+            }
         }
     }
 
-    private fun goToHomeScreen() {
+    private fun openSessionAndGoToHome(session: Session) {
+        matrix.currentSession = session
+        session.open()
         val intent = HomeActivity.newIntent(this)
         startActivity(intent)
         finish()

matrix-sdk-android/build.gradle

@@ -44,6 +44,7 @@ dependencies {
     def arrow_version = "0.7.3"
     def support_version = '28.0.0'
     def moshi_version = '1.7.0'
+    def lifecycle_version = "1.1.1"
 
     implementation fileTree(dir: 'libs', include: ['*.aar'])
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
@@ -51,6 +52,10 @@ dependencies {
     implementation "com.android.support:appcompat-v7:$support_version"
     implementation "com.android.support:recyclerview-v7:$support_version"
 
+    implementation "android.arch.lifecycle:extensions:$lifecycle_version"
+    kapt "android.arch.lifecycle:compiler:$lifecycle_version"
+
+
     // Network
     implementation 'com.squareup.retrofit2:retrofit:2.4.0'
     implementation 'com.squareup.retrofit2:converter-moshi:2.4.0'

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/MatrixCallback.kt

@@ -4,7 +4,7 @@ import im.vector.matrix.android.api.failure.Failure
 
 interface MatrixCallback<in T> {
 
-    fun onSuccess(data: T?)
+    fun onSuccess(data: T)
 
     fun onFailure(failure: Failure)
 

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/events/Event.kt

@@ -16,7 +16,7 @@ data class Event(
         @Json(name = "sender") val sender: String? = null,
         @Json(name = "state_key") val stateKey: String? = null,
         @Json(name = "room_id") var roomId: String? = null,
-        @Json(name = "unsigned_data") val unsignedData: UnsignedData? = null
+        @Json(name = "unsigned") val unsignedData: UnsignedData? = null
 ) {
 
     val contentAsJsonObject: JsonObject? by lazy {

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/events/UnsignedData.kt

@@ -5,7 +5,7 @@ import com.squareup.moshi.JsonClass
 
 @JsonClass(generateAdapter = true)
 data class UnsignedData(
-        @Json(name = "age") val age: Int,
+        @Json(name = "age") val age: Long?,
         @Json(name = "redacted_because") val redactedEvent: Event? = null,
-        @Json(name = "transaction_id") val transactionId: String
+        @Json(name = "transaction_id") val transactionId: String? = null
 )

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/rooms/RoomNameContent.kt

@@ -0,0 +1,9 @@
+package im.vector.matrix.android.api.rooms
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+@JsonClass(generateAdapter = true)
+data class RoomNameContent(
+        @Json(name = "name") val name: String
+)

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/rooms/RoomTopicContent.kt

@@ -0,0 +1,9 @@
+package im.vector.matrix.android.api.rooms
+
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+
+@JsonClass(generateAdapter = true)
+data class RoomTopicContent(
+        @Json(name = "topic") val topic: String
+)

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/session/Session.kt

@@ -1,15 +1,20 @@
 package im.vector.matrix.android.api.session
 
-import im.vector.matrix.android.internal.database.RealmInstanceHolder
+import android.support.annotation.MainThread
+import im.vector.matrix.android.internal.database.SessionRealmHolder
 import im.vector.matrix.android.internal.events.sync.Synchronizer
 
 interface Session {
 
+    @MainThread
+    fun open()
+
     fun synchronizer(): Synchronizer
 
     // Visible for testing request directly. Will be deleted
-    fun realmInstanceHolder(): RealmInstanceHolder
+    fun realmHolder(): SessionRealmHolder
 
+    @MainThread
     fun close()
 
 }

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

@@ -1,11 +0,0 @@
-package im.vector.matrix.android.internal.database
-
-import io.realm.Realm
-import io.realm.RealmConfiguration
-
-class RealmInstanceHolder(realmConfiguration: RealmConfiguration) {
-
-    val realm = Realm.getInstance(realmConfiguration)
-
-
-}

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

@@ -0,0 +1,25 @@
+package im.vector.matrix.android.internal.database
+
+import android.support.annotation.MainThread
+import io.realm.Realm
+import io.realm.RealmConfiguration
+
+class SessionRealmHolder(private val realmConfiguration: RealmConfiguration
+) {
+
+    lateinit var instance: Realm
+
+    @MainThread
+    fun open() {
+        instance = Realm.getInstance(realmConfiguration)
+    }
+
+    @MainThread
+    fun close() {
+        instance.close()
+        Realm.compactRealm(realmConfiguration)
+    }
+
+
+}
+

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

@@ -2,6 +2,7 @@ package im.vector.matrix.android.internal.database.mapper
 
 import com.squareup.moshi.Types
 import im.vector.matrix.android.api.events.Event
+import im.vector.matrix.android.api.events.UnsignedData
 import im.vector.matrix.android.internal.database.model.EventEntity
 import im.vector.matrix.android.internal.di.MoshiProvider
 
@@ -12,14 +13,38 @@ object EventMapper {
     private val type = Types.newParameterizedType(Map::class.java, String::class.java, Any::class.java)
     private val adapter = moshi.adapter<Map<String, Any>>(type)
 
-    fun map(event: Event): EventEntity {
+    internal fun map(event: Event): EventEntity {
         val eventEntity = EventEntity()
         eventEntity.eventId = event.eventId!!
         eventEntity.content = adapter.toJson(event.content)
         eventEntity.prevContent = adapter.toJson(event.prevContent)
         eventEntity.stateKey = event.stateKey
         eventEntity.type = event.type
+        eventEntity.sender = event.sender
+        eventEntity.originServerTs = event.originServerTs
+        eventEntity.age = event.unsignedData?.age ?: event.originServerTs
         return eventEntity
     }
 
+    internal fun map(eventEntity: EventEntity): Event {
+        return Event(
+                eventEntity.type,
+                eventEntity.eventId,
+                adapter.fromJson(eventEntity.content),
+                adapter.fromJson(eventEntity.prevContent ?: ""),
+                eventEntity.originServerTs,
+                eventEntity.sender,
+                eventEntity.stateKey,
+                null,
+                UnsignedData(eventEntity.age)
+        )
+    }
+}
+
+fun EventEntity.asDomain(): Event {
+    return EventMapper.map(this)
+}
+
+fun Event.asEntity(): EventEntity {
+    return EventMapper.map(this)
 }

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/EventEntity.kt

@@ -9,9 +9,14 @@ open class EventEntity(@PrimaryKey var eventId: String = "",
                        var type: String = "",
                        var content: String = "",
                        var prevContent: String? = null,
-                       var stateKey: String? = null
+                       var stateKey: String? = null,
+                       var originServerTs: Long? = null,
+                       var sender: String? = null,
+                       var age: Long? = 0
 ) : RealmObject() {
 
+    companion object
+
     @LinkingObjects("events")
     val chunk: RealmResults<ChunkEntity>? = null
 

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/RoomEntity.kt

@@ -6,10 +6,10 @@ import io.realm.annotations.Ignore
 import io.realm.annotations.PrimaryKey
 import kotlin.properties.Delegates
 
-open class RoomEntity : RealmObject() {
+open class RoomEntity(@PrimaryKey var roomId: String = "",
-
-    @PrimaryKey var roomId: String = ""
                       var chunks: RealmList<ChunkEntity> = RealmList()
+) : RealmObject() {
+
     private var membershipStr: String = Membership.NONE.name
 
     @delegate:Ignore var membership: Membership by Delegates.observable(Membership.valueOf(membershipStr)) { _, _, newValue ->

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/model/RoomSummaryEntity.kt

@@ -0,0 +1,11 @@
+package im.vector.matrix.android.internal.database.model
+
+import io.realm.RealmObject
+import io.realm.annotations.PrimaryKey
+
+// TODO to be completed
+open class RoomSummaryEntity(@PrimaryKey var roomId: String = "",
+                             var displayName: String? = "",
+                             var topic: String? = "",
+                             var lastMessage: EventEntity? = null
+) : RealmObject()

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/ChunkEntityQueries.kt

@@ -0,0 +1,20 @@
+package im.vector.matrix.android.internal.database.query
+
+import im.vector.matrix.android.internal.database.model.ChunkEntity
+import io.realm.Realm
+
+fun ChunkEntity.Companion.getLastChunkFromRoom(realm: Realm, roomId: String): ChunkEntity? {
+    return realm.where(ChunkEntity::class.java)
+            .equalTo("room.roomId", roomId)
+            .isNull("nextToken")
+            .and()
+            .isNotNull("prevToken")
+            .findAll()
+            .lastOrNull()
+}
+
+fun ChunkEntity.Companion.getChunkIncludingEvents(realm: Realm, eventIds: List<String>): ChunkEntity? {
+    return realm.where(ChunkEntity::class.java)
+            .`in`("events.eventId", eventIds.toTypedArray())
+            .findFirst()
+}

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/EventEntityQueries.kt

@@ -0,0 +1,19 @@
+package im.vector.matrix.android.internal.database.query
+
+import im.vector.matrix.android.internal.database.model.EventEntity
+import io.realm.Realm
+import io.realm.RealmResults
+
+fun EventEntity.Companion.getAllFromRoom(realm: Realm, roomId: String): RealmResults<EventEntity> {
+    return realm.where(EventEntity::class.java)
+            .equalTo("chunk.room.roomId", roomId)
+            .findAll()
+}
+
+fun RealmResults<EventEntity>.getLast(type: String? = null): EventEntity? {
+    var query = this.where()
+    if (type != null) {
+        query = query.equalTo("type", type)
+    }
+    return query.findAll().sort("age").lastOrNull()
+}

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/RoomEntityQueries.kt

@@ -2,6 +2,7 @@ package im.vector.matrix.android.internal.database.query
 
 import im.vector.matrix.android.internal.database.model.RoomEntity
 import io.realm.Realm
+import io.realm.RealmResults
 
 fun RoomEntity.Companion.getForId(realm: Realm, roomId: String): RoomEntity? {
     return realm.where<RoomEntity>(RoomEntity::class.java)
@@ -9,10 +10,10 @@ fun RoomEntity.Companion.getForId(realm: Realm, roomId: String): RoomEntity? {
             .findFirst()
 }
 
-fun RoomEntity.Companion.getAll(realm: Realm, membership: RoomEntity.Membership? = null): List<RoomEntity> {
+fun RoomEntity.Companion.getAllAsync(realm: Realm, membership: RoomEntity.Membership? = null): RealmResults<RoomEntity> {
     val query = realm.where(RoomEntity::class.java)
     if (membership != null) {
         query.equalTo("membership", membership.name)
     }
-    return query.findAll()
+    return query.findAllAsync()
 }

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/di/MatrixModule.kt

@@ -3,7 +3,6 @@ package im.vector.matrix.android.internal.di
 import im.vector.matrix.android.api.MatrixOptions
 import im.vector.matrix.android.api.thread.MainThreadExecutor
 import im.vector.matrix.android.internal.util.MatrixCoroutineDispatchers
-import io.realm.Realm
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.IO
 import kotlinx.coroutines.asCoroutineDispatcher

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/di/NetworkModule.kt

@@ -1,9 +1,7 @@
 package im.vector.matrix.android.internal.di
 
 import com.jakewharton.retrofit2.adapter.kotlin.coroutines.CoroutineCallAdapterFactory
-import com.squareup.moshi.Moshi
 import im.vector.matrix.android.internal.network.AccessTokenInterceptor
-import im.vector.matrix.android.internal.network.parsing.UriMoshiAdapter
 import okhttp3.OkHttpClient
 import okhttp3.logging.HttpLoggingInterceptor
 import org.koin.dsl.context.ModuleDefinition

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/di/SessionModule.kt

@@ -1,11 +1,12 @@
 package im.vector.matrix.android.internal.di
 
 import im.vector.matrix.android.internal.auth.data.SessionParams
-import im.vector.matrix.android.internal.database.RealmInstanceHolder
+import im.vector.matrix.android.internal.database.SessionRealmHolder
 import im.vector.matrix.android.internal.legacy.MXDataHandler
 import im.vector.matrix.android.internal.legacy.MXSession
 import im.vector.matrix.android.internal.legacy.data.store.MXFileStore
 import im.vector.matrix.android.internal.session.DefaultSession
+import im.vector.matrix.android.internal.session.RoomSummaryObserver
 import io.realm.RealmConfiguration
 import org.koin.dsl.context.ModuleDefinition
 import org.koin.dsl.module.Module
@@ -21,7 +22,7 @@ class SessionModule(private val sessionParams: SessionParams) : Module {
         }
 
         scope(DefaultSession.SCOPE) {
-           RealmInstanceHolder(get())
+            SessionRealmHolder(get())
         }
 
         scope(DefaultSession.SCOPE) {
@@ -31,6 +32,10 @@ class SessionModule(private val sessionParams: SessionParams) : Module {
                     .build()
         }
 
+        scope(DefaultSession.SCOPE) {
+            RoomSummaryObserver(get(), get(), get())
+        }
+
         scope(DefaultSession.SCOPE) {
             val store = MXFileStore(sessionParams.credentials, false, get())
             val dataHandler = MXDataHandler(store, sessionParams.credentials)

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/events/sync/RoomSyncHandler.kt

@@ -1,10 +1,12 @@
 package im.vector.matrix.android.internal.events.sync
 
 import im.vector.matrix.android.api.events.Event
-import im.vector.matrix.android.internal.database.mapper.EventMapper
+import im.vector.matrix.android.internal.database.mapper.asEntity
 import im.vector.matrix.android.internal.database.model.ChunkEntity
 import im.vector.matrix.android.internal.database.model.RoomEntity
+import im.vector.matrix.android.internal.database.query.getChunkIncludingEvents
 import im.vector.matrix.android.internal.database.query.getForId
+import im.vector.matrix.android.internal.database.query.getLastChunkFromRoom
 import im.vector.matrix.android.internal.events.sync.data.InvitedRoomSync
 import im.vector.matrix.android.internal.events.sync.data.RoomSync
 import io.realm.Realm
@@ -39,8 +41,7 @@ class RoomSyncHandler(private val realmConfiguration: RealmConfiguration) {
                                  roomId: String,
                                  roomSync: RoomSync): RoomEntity {
 
-        val roomEntity = RoomEntity.getForId(realm, roomId)
+        val roomEntity = RoomEntity.getForId(realm, roomId) ?: RoomEntity(roomId)
-                         ?: RoomEntity().apply { this.roomId = roomId }
 
         if (roomEntity.membership == RoomEntity.Membership.INVITED) {
             roomEntity.chunks.deleteAllFromRealm()
@@ -95,16 +96,16 @@ class RoomSyncHandler(private val realmConfiguration: RealmConfiguration) {
                                  isLimited: Boolean = true): ChunkEntity {
 
         val chunkEntity = if (!isLimited) {
-            realm.where(ChunkEntity::class.java).equalTo("room.roomId", roomId).isNull("nextToken").and().isNotNull("prevToken").findAll().lastOrNull()
+            ChunkEntity.getLastChunkFromRoom(realm, roomId)
         } else {
-            realm.where(ChunkEntity::class.java).`in`("events.eventId", eventList.map { it.eventId }.toTypedArray()).findFirst()
+            val eventIds = eventList.filter { it.eventId != null }.map { it.eventId!! }
-        } ?: ChunkEntity()
+            ChunkEntity.getChunkIncludingEvents(realm, eventIds)
+        } ?: ChunkEntity().apply { this.prevToken = prevToken }
 
-        chunkEntity.prevToken = prevToken
         chunkEntity.nextToken = nextToken
         chunkEntity.isLimited = isLimited
         eventList.forEach { event ->
-            val eventEntity = EventMapper.map(event).let {
+            val eventEntity = event.asEntity().let {
                 realm.copyToRealmOrUpdate(it)
             }
             if (!chunkEntity.events.contains(eventEntity)) {

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/events/sync/Synchronizer.kt

@@ -2,6 +2,7 @@ package im.vector.matrix.android.internal.events.sync
 
 import arrow.core.Either
 import arrow.core.flatMap
+import arrow.core.leftIfNull
 import im.vector.matrix.android.api.MatrixCallback
 import im.vector.matrix.android.api.failure.Failure
 import im.vector.matrix.android.api.util.Cancelable
@@ -42,6 +43,8 @@ class Synchronizer(private val syncAPI: SyncAPI,
         params["filter"] = filterBody.toJSONString()
         executeRequest<SyncResponse> {
             apiCall = syncAPI.sync(params)
+        }.leftIfNull {
+            Failure.Unknown(RuntimeException("Sync response shouln't be null"))
         }.flatMap {
             token = it?.nextBatch
             try {

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/DefaultSession.kt

@@ -1,8 +1,10 @@
 package im.vector.matrix.android.internal.session
 
+import android.os.Looper
+import android.support.annotation.MainThread
 import im.vector.matrix.android.api.session.Session
 import im.vector.matrix.android.internal.auth.data.SessionParams
-import im.vector.matrix.android.internal.database.RealmInstanceHolder
+import im.vector.matrix.android.internal.database.SessionRealmHolder
 import im.vector.matrix.android.internal.di.SessionModule
 import im.vector.matrix.android.internal.events.sync.SyncModule
 import im.vector.matrix.android.internal.events.sync.Synchronizer
@@ -12,34 +14,57 @@ import org.koin.standalone.StandAloneContext
 import org.koin.standalone.getKoin
 import org.koin.standalone.inject
 
-class DefaultSession(sessionParams: SessionParams) : Session, KoinComponent {
+class DefaultSession(private val sessionParams: SessionParams) : Session, KoinComponent {
-
-    private val realmInstanceHolder by inject<RealmInstanceHolder>()
-    private val synchronizer by inject<Synchronizer>()
-    private val scope: Scope
-
-    init {
-        val sessionModule = SessionModule(sessionParams)
-        val syncModule = SyncModule()
-        StandAloneContext.loadKoinModules(listOf(sessionModule, syncModule))
-        scope = getKoin().getOrCreateScope(SCOPE)
-    }
-
-    override fun synchronizer(): Synchronizer {
-        return synchronizer
-    }
-
-    override fun realmInstanceHolder(): RealmInstanceHolder {
-        return realmInstanceHolder
-    }
-
-    override fun close() {
-        realmInstanceHolder.realm.close()
-        scope.close()
-    }
 
     companion object {
         const val SCOPE: String = "session"
     }
 
+    private lateinit var scope: Scope
+
+    private val realmInstanceHolder by inject<SessionRealmHolder>()
+    private val synchronizer by inject<Synchronizer>()
+    private val roomSummaryObserver by inject<RoomSummaryObserver>()
+
+    private var isOpen = false
+
+    @MainThread
+    override fun open() {
+        checkIsMainThread()
+        assert(!isOpen)
+        isOpen = true
+        val sessionModule = SessionModule(sessionParams)
+        val syncModule = SyncModule()
+        StandAloneContext.loadKoinModules(listOf(sessionModule, syncModule))
+        scope = getKoin().getOrCreateScope(SCOPE)
+        realmInstanceHolder.open()
+        roomSummaryObserver.start()
+    }
+
+    override fun synchronizer(): Synchronizer {
+        assert(isOpen)
+        return synchronizer
+    }
+
+    override fun realmHolder(): SessionRealmHolder {
+        assert(isOpen)
+        return realmInstanceHolder
+    }
+
+    @MainThread
+    override fun close() {
+        checkIsMainThread()
+        assert(isOpen)
+        roomSummaryObserver.dispose()
+        realmInstanceHolder.close()
+        scope.close()
+        isOpen = false
+    }
+
+    private fun checkIsMainThread() {
+        if (Looper.myLooper() != Looper.getMainLooper()) {
+            throw IllegalStateException("Should be called on main thread")
+        }
+    }
+
 }

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/RoomSummaryObserver.kt

@@ -0,0 +1,73 @@
+package im.vector.matrix.android.internal.session
+
+import im.vector.matrix.android.api.events.EventType
+import im.vector.matrix.android.api.rooms.RoomNameContent
+import im.vector.matrix.android.api.rooms.RoomTopicContent
+import im.vector.matrix.android.internal.database.SessionRealmHolder
+import im.vector.matrix.android.internal.database.mapper.asDomain
+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.RoomSummaryEntity
+import im.vector.matrix.android.internal.database.query.getAllAsync
+import im.vector.matrix.android.internal.database.query.getAllFromRoom
+import im.vector.matrix.android.internal.database.query.getLast
+import im.vector.matrix.android.internal.util.MatrixCoroutineDispatchers
+import io.realm.Realm
+import io.realm.RealmConfiguration
+import io.realm.RealmResults
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+import java.util.concurrent.atomic.AtomicBoolean
+
+internal class RoomSummaryObserver(private val mainThreadRealm: SessionRealmHolder,
+                                   private val matrixCoroutineDispatchers: MatrixCoroutineDispatchers,
+                                   private val realmConfiguration: RealmConfiguration
+) {
+
+    private lateinit var roomResults: RealmResults<RoomEntity>
+    private var isStarted = AtomicBoolean(false)
+
+    fun start() {
+        if (isStarted.compareAndSet(false, true)) {
+            roomResults = RoomEntity.getAllAsync(mainThreadRealm.instance)
+            roomResults.addChangeListener { rooms, changeSet ->
+                manageRoomResults(rooms, changeSet.changes)
+                manageRoomResults(rooms, changeSet.insertions)
+            }
+        }
+    }
+
+    fun dispose() {
+        if (isStarted.compareAndSet(true, false)) {
+            roomResults.removeAllChangeListeners()
+        }
+    }
+
+    // PRIVATE
+
+    private fun manageRoomResults(rooms: RealmResults<RoomEntity>, indexes: IntArray) {
+        indexes.forEach {
+            val room = rooms[it]
+            if (room != null) {
+                manageRoom(room.roomId)
+            }
+        }
+    }
+
+    private fun manageRoom(roomId: String) = GlobalScope.launch(matrixCoroutineDispatchers.io) {
+        val realm = Realm.getInstance(realmConfiguration)
+        val roomEvents = EventEntity.getAllFromRoom(realm, roomId)
+        val lastNameEvent = roomEvents.getLast(EventType.STATE_ROOM_NAME)?.asDomain()
+        val lastTopicEvent = roomEvents.getLast(EventType.STATE_ROOM_TOPIC)?.asDomain()
+        val lastMessageEvent = roomEvents.getLast(EventType.MESSAGE)
+
+        realm.executeTransaction { realmInstance ->
+            val roomSummary = realmInstance.copyToRealmOrUpdate(RoomSummaryEntity(roomId))
+            roomSummary.displayName = lastNameEvent?.content<RoomNameContent>()?.name
+            roomSummary.topic = lastTopicEvent?.content<RoomTopicContent>()?.topic
+            roomSummary.lastMessage = lastMessageEvent
+        }
+        realm.close()
+    }
+
+}