Introduce MvRx in the application + start managing UI

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

@@ -2,22 +2,12 @@ package im.vector.matrix.android.api.failure
 
 import java.io.IOException
 
-sealed class Failure {
+sealed class Failure(cause: Throwable? = null) : Throwable(cause = cause) {
 
-    data class Unknown(val exception: Exception? = null) : Failure()
-    data class NetworkConnection(val ioException: IOException) : Failure()
-    data class ServerError(val error: MatrixError) : Failure()
+    data class Unknown(val throwable: Throwable? = null) : Failure(throwable)
+    data class NetworkConnection(val ioException: IOException) : Failure(ioException)
+    data class ServerError(val error: MatrixError) : Failure(RuntimeException(error.toString()))
 
     abstract class FeatureFailure : Failure()
 
-    fun toException(): Exception {
-        return when (this) {
-            is Unknown           -> this.exception ?: RuntimeException("Unknown error")
-            is NetworkConnection -> this.ioException
-            is ServerError       -> RuntimeException(this.error.toString())
-            is FeatureFailure    -> RuntimeException("Feature error")
-        }
-
-    }
-
 }

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

@@ -13,5 +13,9 @@ interface RoomService {
 
     fun liveRoomSummaries(): LiveData<List<RoomSummary>>
 
+    fun lastSelectedRoom(): RoomSummary?
+
+    fun saveLastSelectedRoom(roomSummary: RoomSummary)
+
 
 }

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

@@ -13,8 +13,20 @@ object RoomSummaryMapper {
                 roomSummaryEntity.topic ?: ""
         )
     }
+
+    internal fun map(roomSummary: RoomSummary): RoomSummaryEntity {
+        return RoomSummaryEntity(
+                roomSummary.roomId,
+                roomSummary.displayName,
+                roomSummary.topic
+        )
+    }
 }
 
 fun RoomSummaryEntity.asDomain(): RoomSummary {
     return RoomSummaryMapper.map(this)
+}
+
+fun RoomSummaryEntity.asEntity(): RoomSummary {
+    return RoomSummaryMapper.map(this)
 }

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

@@ -11,7 +11,8 @@ open class RoomSummaryEntity(@PrimaryKey var roomId: String = "",
                              var lastMessage: EventEntity? = null,
                              var heroes: RealmList<String> = RealmList(),
                              var joinedMembersCount: Int? = 0,
-                             var invitedMembersCount: Int? = 0
+                             var invitedMembersCount: Int? = 0,
+                             var isLatestSelected: Boolean = false
 ) : RealmObject() {
 
     companion object

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

@@ -13,3 +13,9 @@ fun RoomSummaryEntity.Companion.where(realm: Realm, roomId: String? = null): Rea
     }
     return query
 }
+
+fun RoomSummaryEntity.Companion.lastSelected(realm: Realm): RoomSummaryEntity? {
+    return realm.where<RoomSummaryEntity>()
+            .equalTo(RoomSummaryEntityFields.IS_LATEST_SELECTED, true)
+            .findFirst()
+}

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

@@ -75,6 +75,14 @@ class DefaultSession(override val sessionParams: SessionParams) : Session, KoinC
         return roomService.liveRoomSummaries()
     }
 
+    override fun lastSelectedRoom(): RoomSummary? {
+        return roomService.lastSelectedRoom()
+    }
+
+    override fun saveLastSelectedRoom(roomSummary: RoomSummary) {
+        roomService.saveLastSelectedRoom(roomSummary)
+    }
+
     // Private methods *****************************************************************************
 
     private fun checkIsMainThread() {

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

@@ -8,6 +8,7 @@ import im.vector.matrix.android.api.session.room.model.RoomSummary
 import im.vector.matrix.android.internal.database.mapper.asDomain
 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.lastSelected
 import im.vector.matrix.android.internal.database.query.where
 
 class DefaultRoomService(private val monarchy: Monarchy) : RoomService {
@@ -42,5 +43,20 @@ class DefaultRoomService(private val monarchy: Monarchy) : RoomService {
         )
     }
 
+    override fun lastSelectedRoom(): RoomSummary? {
+        var lastSelected: RoomSummary? = null
+        monarchy.doWithRealm { realm ->
+            lastSelected = RoomSummaryEntity.lastSelected(realm)?.asDomain()
+        }
+        return lastSelected
+    }
 
+    override fun saveLastSelectedRoom(roomSummary: RoomSummary) {
+        monarchy.writeAsync { realm ->
+            val lastSelected = RoomSummaryEntity.lastSelected(realm)
+            val roomSummaryEntity = RoomSummaryEntity.where(realm, roomSummary.roomId).findFirst()
+            lastSelected?.isLatestSelected = false
+            roomSummaryEntity?.isLatestSelected = true
+        }
+    }
 }

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

@@ -53,7 +53,7 @@ class TimelineBoundaryCallback(private val roomId: String,
         }
 
         override fun onFailure(failure: Failure) {
-            pagingRequestCallback.recordFailure(failure.toException())
+            pagingRequestCallback.recordFailure(failure)
         }
     }
 }