Rx : hides subject inside a class

app/src/main/java/im/vector/riotredesign/core/utils/RxStore.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2019 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.riotredesign.core.utils
+
+import com.jakewharton.rxrelay2.BehaviorRelay
+import io.reactivex.Observable
+
+open class RxStore<T>(defaultValue: T? = null) {
+
+    private val storeSubject: BehaviorRelay<T> = if (defaultValue == null) {
+        BehaviorRelay.create<T>()
+    } else {
+        BehaviorRelay.createDefault(defaultValue)
+    }
+
+    fun observe(): Observable<T> {
+        return storeSubject.hide().distinctUntilChanged()
+    }
+
+    fun post(value: T) {
+        storeSubject.accept(value)
+    }
+}

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

@@ -16,8 +16,8 @@
 
 package im.vector.riotredesign.features.home
 
-import im.vector.riotredesign.features.home.group.SelectedGroupHolder
-import im.vector.riotredesign.features.home.room.VisibleRoomHolder
+import im.vector.riotredesign.features.home.group.SelectedGroupStore
+import im.vector.riotredesign.features.home.room.VisibleRoomStore
 import im.vector.riotredesign.features.home.room.detail.timeline.DefaultItemFactory
 import im.vector.riotredesign.features.home.room.detail.timeline.MessageItemFactory
 import im.vector.riotredesign.features.home.room.detail.timeline.RoomMemberItemFactory
@@ -80,11 +80,11 @@ class HomeModule {
         }
 
         single {
-            SelectedGroupHolder()
+            SelectedGroupStore()
         }
 
         single {
-            VisibleRoomHolder()
+            VisibleRoomStore()
         }
 
         single {

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

@@ -16,6 +16,7 @@
 
 package im.vector.riotredesign.features.home.group
 
+import arrow.core.Option
 import com.airbnb.mvrx.MvRxViewModelFactory
 import com.airbnb.mvrx.ViewModelContext
 import im.vector.matrix.android.api.Matrix
@@ -25,7 +26,7 @@ import im.vector.riotredesign.core.platform.RiotViewModel
 import org.koin.android.ext.android.get
 
 class GroupListViewModel(initialState: GroupListViewState,
-                         private val selectedGroupHolder: SelectedGroupHolder,
+                         private val selectedGroupHolder: SelectedGroupStore,
                          private val session: Session
 ) : RiotViewModel<GroupListViewState>(initialState) {
 
@@ -34,7 +35,7 @@ class GroupListViewModel(initialState: GroupListViewState,
         @JvmStatic
         override fun create(viewModelContext: ViewModelContext, state: GroupListViewState): GroupListViewModel? {
             val currentSession = Matrix.getInstance().currentSession
-            val selectedGroupHolder = viewModelContext.activity.get<SelectedGroupHolder>()
+            val selectedGroupHolder = viewModelContext.activity.get<SelectedGroupStore>()
             return GroupListViewModel(state, selectedGroupHolder, currentSession)
         }
     }
@@ -46,7 +47,8 @@ class GroupListViewModel(initialState: GroupListViewState,
 
     private fun observeState() {
         subscribe {
-            selectedGroupHolder.setSelectedGroup(it.selectedGroup)
+            val selectedGroup = Option.fromNullable(it.selectedGroup)
+            selectedGroupHolder.post(selectedGroup)
         }
     }
 

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

@@ -17,22 +17,7 @@
 package im.vector.riotredesign.features.home.group
 
 import arrow.core.Option
-import com.jakewharton.rxrelay2.BehaviorRelay
 import im.vector.matrix.android.api.session.group.model.GroupSummary
-import io.reactivex.Observable
+import im.vector.riotredesign.core.utils.RxStore
 
-class SelectedGroupHolder {
-
-    private val selectedGroupStream = BehaviorRelay.createDefault<Option<GroupSummary>>(Option.empty())
-
-    fun setSelectedGroup(group: GroupSummary?) {
-        val optionValue = Option.fromNullable(group)
-        selectedGroupStream.accept(optionValue)
-    }
-
-    fun selectedGroup(): Observable<Option<GroupSummary>> {
-        return selectedGroupStream.hide()
-    }
-
-
-}
+class SelectedGroupStore : RxStore<Option<GroupSummary>>(Option.empty())

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

@@ -16,21 +16,6 @@
 
 package im.vector.riotredesign.features.home.room
 
-import com.jakewharton.rxrelay2.BehaviorRelay
-import io.reactivex.Observable
-import io.reactivex.subjects.BehaviorSubject
+import im.vector.riotredesign.core.utils.RxStore
 
-class VisibleRoomHolder {
-
-    private val visibleRoomStream = BehaviorRelay.create<String>()
-
-    fun setVisibleRoom(roomId: String) {
-        visibleRoomStream.accept(roomId)
-    }
-
-    fun visibleRoom(): Observable<String> {
-        return visibleRoomStream.hide()
-    }
-
-
-}
+class VisibleRoomStore : RxStore<String>()

app/src/main/java/im/vector/riotredesign/features/home/room/detail/RoomDetailViewModel.kt

@@ -26,14 +26,14 @@ import im.vector.matrix.android.api.session.events.model.Event
 import im.vector.matrix.rx.rx
 import im.vector.riotredesign.core.extensions.lastMinBy
 import im.vector.riotredesign.core.platform.RiotViewModel
-import im.vector.riotredesign.features.home.room.VisibleRoomHolder
+import im.vector.riotredesign.features.home.room.VisibleRoomStore
 import io.reactivex.rxkotlin.subscribeBy
 import org.koin.android.ext.android.get
 import java.util.concurrent.TimeUnit
 
 class RoomDetailViewModel(initialState: RoomDetailViewState,
                           private val session: Session,
-                          private val visibleRoomHolder: VisibleRoomHolder
+                          private val visibleRoomHolder: VisibleRoomStore
 ) : RiotViewModel<RoomDetailViewState>(initialState) {
 
     private val room = session.getRoom(initialState.roomId)!!
@@ -47,7 +47,7 @@ class RoomDetailViewModel(initialState: RoomDetailViewState,
         @JvmStatic
         override fun create(viewModelContext: ViewModelContext, state: RoomDetailViewState): RoomDetailViewModel? {
             val currentSession = Matrix.getInstance().currentSession
-            val visibleRoomHolder = viewModelContext.activity.get<VisibleRoomHolder>()
+            val visibleRoomHolder = viewModelContext.activity.get<VisibleRoomStore>()
             return RoomDetailViewModel(state, currentSession, visibleRoomHolder)
         }
     }
@@ -78,7 +78,7 @@ class RoomDetailViewModel(initialState: RoomDetailViewState,
     }
 
     private fun handleIsDisplayed() {
-        visibleRoomHolder.setVisibleRoom(roomId)
+        visibleRoomHolder.post(roomId)
     }
 
     private fun observeDisplayedEvents() {

app/src/main/java/im/vector/riotredesign/features/home/room/list/RoomListViewModel.kt

@@ -27,8 +27,8 @@ import im.vector.matrix.android.api.session.room.model.RoomSummary
 import im.vector.matrix.android.api.session.room.model.tag.RoomTag
 import im.vector.matrix.rx.rx
 import im.vector.riotredesign.core.platform.RiotViewModel
-import im.vector.riotredesign.features.home.group.SelectedGroupHolder
-import im.vector.riotredesign.features.home.room.VisibleRoomHolder
+import im.vector.riotredesign.features.home.group.SelectedGroupStore
+import im.vector.riotredesign.features.home.room.VisibleRoomStore
 import io.reactivex.Observable
 import io.reactivex.functions.Function3
 import io.reactivex.rxkotlin.subscribeBy
@@ -39,8 +39,8 @@ typealias RoomListFilterName = CharSequence
 
 class RoomListViewModel(initialState: RoomListViewState,
                         private val session: Session,
-                        private val selectedGroupHolder: SelectedGroupHolder,
-                        private val visibleRoomHolder: VisibleRoomHolder,
+                        private val selectedGroupHolder: SelectedGroupStore,
+                        private val visibleRoomHolder: VisibleRoomStore,
                         private val roomSelectionRepository: RoomSelectionRepository,
                         private val roomSummaryComparator: RoomSummaryComparator)
     : RiotViewModel<RoomListViewState>(initialState) {
@@ -51,8 +51,8 @@ class RoomListViewModel(initialState: RoomListViewState,
         override fun create(viewModelContext: ViewModelContext, state: RoomListViewState): RoomListViewModel? {
             val currentSession = Matrix.getInstance().currentSession
             val roomSelectionRepository = viewModelContext.activity.get<RoomSelectionRepository>()
-            val selectedGroupHolder = viewModelContext.activity.get<SelectedGroupHolder>()
-            val visibleRoomHolder = viewModelContext.activity.get<VisibleRoomHolder>()
+            val selectedGroupHolder = viewModelContext.activity.get<SelectedGroupStore>()
+            val visibleRoomHolder = viewModelContext.activity.get<VisibleRoomStore>()
             val roomSummaryComparator = viewModelContext.activity.get<RoomSummaryComparator>()
             return RoomListViewModel(state, currentSession, selectedGroupHolder, visibleRoomHolder, roomSelectionRepository, roomSummaryComparator)
         }
@@ -87,17 +87,18 @@ class RoomListViewModel(initialState: RoomListViewState,
     }
 
     private fun observeVisibleRoom() {
-        visibleRoomHolder.visibleRoom()
-                .subscribeBy {
+        visibleRoomHolder.observe()
+                .doOnNext {
                     setState { copy(selectedRoomId = it) }
                 }
+                .subscribe()
                 .disposeOnClear()
     }
 
     private fun observeRoomSummaries() {
         Observable.combineLatest<List<RoomSummary>, Option<GroupSummary>, Option<RoomListFilterName>, RoomSummaries>(
                 session.rx().liveRoomSummaries().throttleLast(300, TimeUnit.MILLISECONDS),
-                selectedGroupHolder.selectedGroup(),
+                selectedGroupHolder.observe(),
                 roomListFilter.throttleLast(300, TimeUnit.MILLISECONDS),
                 Function3 { rooms, selectedGroupOption, filterRoomOption ->
                     val filteredRooms = filterRooms(rooms, filterRoomOption)