Merge branch 'develop' into ux

android-ddp/src/main/java/chat/rocket/android_ddp/rx/RxWebSocket.java

 package chat.rocket.android_ddp.rx;
 
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+import chat.rocket.android.log.RCLog;
 import io.reactivex.BackpressureStrategy;
 import io.reactivex.Flowable;
 import io.reactivex.FlowableOnSubscribe;
 import io.reactivex.exceptions.OnErrorNotImplementedException;
 import io.reactivex.flowables.ConnectableFlowable;
-
-import java.io.IOException;
-import chat.rocket.android.log.RCLog;
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
 import okhttp3.Response;
@@ -15,8 +16,10 @@ import okhttp3.WebSocket;
 import okhttp3.WebSocketListener;
 
 public class RxWebSocket {
+  public static final int REASON_NETWORK_ERROR = 100;
   private OkHttpClient httpClient;
   private WebSocket webSocket;
+  private boolean hadErrorsBefore;
 
   public RxWebSocket(OkHttpClient client) {
     httpClient = client;
@@ -30,6 +33,7 @@ public class RxWebSocket {
             .newWebSocket(request, new WebSocketListener() {
               @Override
               public void onOpen(WebSocket webSocket, Response response) {
+                hadErrorsBefore = false;
                 RxWebSocket.this.webSocket = webSocket;
                 emitter.onNext(new RxWebSocketCallback.Open(RxWebSocket.this.webSocket, response));
               }
@@ -37,7 +41,11 @@ public class RxWebSocket {
               @Override
               public void onFailure(WebSocket webSocket, Throwable err, Response response) {
                 try {
-                  emitter.onError(new RxWebSocketCallback.Failure(webSocket, err, response));
+                  if (!hadErrorsBefore) {
+                    hadErrorsBefore = true;
+                    emitter.onNext(new RxWebSocketCallback.Close(webSocket, REASON_NETWORK_ERROR, err.getMessage()));
+                    emitter.onComplete();
+                  }
                 } catch (OnErrorNotImplementedException ex) {
                   RCLog.w(ex, "OnErrorNotImplementedException ignored");
                 }
@@ -51,11 +59,10 @@ public class RxWebSocket {
               @Override
               public void onClosed(WebSocket webSocket, int code, String reason) {
                 emitter.onNext(new RxWebSocketCallback.Close(webSocket, code, reason));
-                emitter.onComplete();
               }
             }),
         BackpressureStrategy.BUFFER
-    ).publish();
+    ).delay(4, TimeUnit.SECONDS).publish();
   }
 
   public boolean sendText(String message) throws IOException {

android-ddp/src/main/java/chat/rocket/android_ddp/rx/RxWebSocketCallback.java

 package chat.rocket.android_ddp.rx;
 
-import static android.R.attr.type;
-
 import chat.rocket.android.log.RCLog;
 import okhttp3.Response;
 import okhttp3.WebSocket;
@@ -28,25 +26,8 @@ public class RxWebSocketCallback {
     public Open(WebSocket websocket, Response response) {
       super("Open", websocket);
       this.response = response;
-    }
-  }
-
-  public static class Failure extends Exception {
-    public WebSocket ws;
-    public Response response;
-
-    public Failure(WebSocket websocket, Throwable err, Response response) {
-      super(err);
-      this.ws = websocket;
-      this.response = response;
-    }
-
-    @Override
-    public String toString() {
-      if (response != null) {
-        return "[" + type + "] " + response.message();
-      } else {
-        return super.toString();
+      if (response != null && response.body() != null) {
+        this.response.body().close();
       }
     }
   }

app/build.gradle

@@ -35,7 +35,7 @@ android {
         applicationId "chat.rocket.android"
         minSdkVersion 16
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 26
+        versionCode 27
         versionName "1.0.16"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 

app/src/main/java/chat/rocket/android/activity/MainActivity.java

@@ -16,11 +16,11 @@ import chat.rocket.android.fragment.chatroom.HomeFragment;
 import chat.rocket.android.fragment.chatroom.RoomFragment;
 import chat.rocket.android.fragment.sidebar.SidebarMainFragment;
 import chat.rocket.android.helper.KeyboardHelper;
+import chat.rocket.android.service.ConnectivityManager;
+import chat.rocket.android.widget.RoomToolbar;
 import chat.rocket.core.interactors.CanCreateRoomInteractor;
 import chat.rocket.core.interactors.RoomInteractor;
 import chat.rocket.core.interactors.SessionInteractor;
-import chat.rocket.android.service.ConnectivityManager;
-import chat.rocket.android.widget.RoomToolbar;
 import chat.rocket.persistence.realm.repositories.RealmRoomRepository;
 import chat.rocket.persistence.realm.repositories.RealmSessionRepository;
 import chat.rocket.persistence.realm.repositories.RealmUserRepository;
@@ -34,6 +34,7 @@ public class MainActivity extends AbstractAuthedActivity implements MainContract
   private StatusTicker statusTicker;
 
   private MainContract.Presenter presenter;
+  private RoomFragment roomFragment;
 
   @Override
   protected int getLayoutContainerForFragment() {
@@ -179,7 +180,8 @@ public class MainActivity extends AbstractAuthedActivity implements MainContract
 
   @Override
   public void showRoom(String hostname, String roomId) {
-    showFragment(RoomFragment.create(hostname, roomId));
+    roomFragment = RoomFragment.create(hostname, roomId);
+    showFragment(roomFragment);
     closeSidebarIfNeeded();
     KeyboardHelper.hideSoftKeyboard(this);
   }
@@ -222,6 +224,9 @@ public class MainActivity extends AbstractAuthedActivity implements MainContract
   @Override
   public void showConnectionOk() {
     statusTicker.updateStatus(StatusTicker.STATUS_DISMISS, null);
+    if (roomFragment != null) {
+      roomFragment.refreshRoom();
+    }
   }
 
   //TODO: consider this class to define in layouthelper for more complicated operation.

app/src/main/java/chat/rocket/android/activity/MainPresenter.java

@@ -3,22 +3,23 @@ package chat.rocket.android.activity;
 import android.support.annotation.NonNull;
 import android.support.v4.util.Pair;
 
-import io.reactivex.Flowable;
-import io.reactivex.android.schedulers.AndroidSchedulers;
-import io.reactivex.disposables.Disposable;
-
 import chat.rocket.android.BackgroundLooper;
 import chat.rocket.android.RocketChatCache;
 import chat.rocket.android.api.MethodCallHelper;
 import chat.rocket.android.helper.LogIfError;
 import chat.rocket.android.helper.Logger;
 import chat.rocket.android.service.ConnectivityManagerApi;
+import chat.rocket.android.service.ServerConnectivity;
 import chat.rocket.android.shared.BasePresenter;
 import chat.rocket.core.interactors.CanCreateRoomInteractor;
 import chat.rocket.core.interactors.RoomInteractor;
 import chat.rocket.core.interactors.SessionInteractor;
 import chat.rocket.core.models.Session;
 import chat.rocket.core.models.User;
+import hu.akarnokd.rxjava.interop.RxJavaInterop;
+import io.reactivex.Flowable;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.disposables.Disposable;
 
 public class MainPresenter extends BasePresenter<MainContract.View>
     implements MainContract.Presenter {
@@ -63,6 +64,7 @@ public class MainPresenter extends BasePresenter<MainContract.View>
 
     openRoom();
 
+    subscribeToNetworkChanges();
     subscribeToUnreadCount();
     subscribeToSession();
     setUserOnline();
@@ -96,10 +98,8 @@ public class MainPresenter extends BasePresenter<MainContract.View>
 
   @Override
   public void onRetryLogin() {
-    final Disposable subscription = sessionInteractor.retryLogin()
-        .subscribe();
-
-    addSubscription(subscription);
+    view.showConnecting();
+    connectivityManagerApi.keepAliveServer();
   }
 
   private void openRoom() {
@@ -161,6 +161,23 @@ public class MainPresenter extends BasePresenter<MainContract.View>
     addSubscription(subscription);
   }
 
+  private void subscribeToNetworkChanges() {
+    Disposable disposable = RxJavaInterop.toV2Flowable(connectivityManagerApi.getServerConnectivityAsObservable())
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe(
+                    connectivity -> {
+                      if (connectivity.state == ServerConnectivity.STATE_CONNECTED) {
+                        view.showConnectionOk();
+                        return;
+                      }
+                      view.showConnecting();
+                    },
+                    Logger::report
+            );
+
+    addSubscription(disposable);
+  }
+
   private void setUserOnline() {
     methodCallHelper.setUserPresence(User.STATUS_ONLINE)
         .continueWith(new LogIfError());

app/src/main/java/chat/rocket/android/api/DDPClientWrapper.java

 package chat.rocket.android.api;
 
 import android.support.annotation.Nullable;
-import io.reactivex.Flowable;
+
 import org.json.JSONArray;
 import org.json.JSONException;
 
 import java.util.UUID;
+
 import bolts.Task;
 import chat.rocket.android.helper.OkHttpHelper;
 import chat.rocket.android.helper.TextUtils;
@@ -13,6 +14,7 @@ import chat.rocket.android.log.RCLog;
 import chat.rocket.android_ddp.DDPClient;
 import chat.rocket.android_ddp.DDPClientCallback;
 import chat.rocket.android_ddp.DDPSubscription;
+import io.reactivex.Flowable;
 
 /**
  * DDP client wrapper.

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomContract.java

@@ -49,5 +49,7 @@ public interface RoomContract {
     void onUnreadCount();
 
     void onMarkAsRead();
+
+    void refreshRoom();
   }
 }

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomFragment.java

@@ -21,6 +21,11 @@ import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
+
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.List;
+
 import chat.rocket.android.BackgroundLooper;
 import chat.rocket.android.R;
 import chat.rocket.android.api.MethodCallHelper;
@@ -70,15 +75,13 @@ import chat.rocket.persistence.realm.repositories.RealmSessionRepository;
 import chat.rocket.persistence.realm.repositories.RealmSpotlightRoomRepository;
 import chat.rocket.persistence.realm.repositories.RealmSpotlightUserRepository;
 import chat.rocket.persistence.realm.repositories.RealmUserRepository;
-import com.fernandocejas.arrow.optional.Optional;
+
+import com.hadisatrio.optional.Optional;
 import com.jakewharton.rxbinding2.support.v4.widget.RxDrawerLayout;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.CompositeDisposable;
 import io.reactivex.disposables.Disposable;
-import java.lang.reflect.Field;
-import java.util.ArrayList;
-import java.util.List;
 import permissions.dispatcher.NeedsPermission;
 import permissions.dispatcher.RuntimePermissions;
 
@@ -188,7 +191,7 @@ public class RoomFragment extends AbstractChatRoomFragment implements
   protected void onSetupView() {
     messageRecyclerView = rootView.findViewById(R.id.messageRecyclerView);
 
-    messageListAdapter = new MessageListAdapter(getContext());
+    messageListAdapter = new MessageListAdapter(getContext(), hostname);
     messageRecyclerView.setAdapter(messageListAdapter);
     messageListAdapter.setOnItemClickListener(this);
     messageListAdapter.setOnItemLongClickListener(this);
@@ -251,8 +254,8 @@ public class RoomFragment extends AbstractChatRoomFragment implements
 
   protected Snackbar getUnreadCountIndicatorView(int count) {
     // TODO: replace with another custom View widget, not to hide message composer.
-    final String caption = getResources().getString(
-        R.string.fmt_dialog_view_latest_message_title, count);
+    final String caption = getResources().getQuantityString(
+        R.plurals.fmt_dialog_view_latest_message_title, count, count);
 
     return Snackbar.make(rootView, caption, Snackbar.LENGTH_LONG)
         .setAction(R.string.dialog_view_latest_message_action, view -> scrollToLatestMessage());
@@ -369,7 +372,7 @@ public class RoomFragment extends AbstractChatRoomFragment implements
                             new DefaultTempSpotlightUserCaller(methodCallHelper)
                         ),
                         pair.first.get(),
-                        RocketChatUserStatusProvider.getInstance(),
+                        RocketChatUserStatusProvider.INSTANCE,
                         AndroidSchedulers.from(BackgroundLooper.get()),
                         AndroidSchedulers.mainThread()
                     )
@@ -599,4 +602,8 @@ public class RoomFragment extends AbstractChatRoomFragment implements
     edittingMessage = message;
     messageFormManager.setEditMessage(message.getMessage());
   }
+
+  public void refreshRoom() {
+    presenter.loadMessages();
+  }
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomPresenter.java

@@ -4,7 +4,7 @@ import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.util.Pair;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.Disposable;
@@ -55,7 +55,11 @@ public class RoomPresenter extends BasePresenter<RoomContract.View>
   @Override
   public void bindView(@NonNull RoomContract.View view) {
     super.bindView(view);
+    refreshRoom();
+  }
 
+  @Override
+  public void refreshRoom() {
     getRoomRoles();
     getRoomInfo();
     getRoomHistoryStateInfo();

app/src/main/java/chat/rocket/android/fragment/chatroom/dialog/UsersOfRoomDialogFragment.java

@@ -7,7 +7,7 @@ import android.support.v7.widget.GridLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.TextView;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.CompositeDisposable;
 import org.json.JSONArray;
@@ -117,7 +117,7 @@ public class UsersOfRoomDialogFragment extends AbstractChatRoomDialogFragment {
     RecyclerView recyclerView = (RecyclerView) getDialog().findViewById(R.id.recyclerview);
     recyclerView.setLayoutManager(new GridLayoutManager(getContext(), 2));
     recyclerView.setAdapter(
-        new RoomUserAdapter(getContext(), realmHelper, rocketChatAbsoluteUrlOptional.get()));
+        new RoomUserAdapter(getContext(), realmHelper, rocketChatAbsoluteUrlOptional.get(), hostname));
   }
 
   private void requestGetUsersOfRoom() {
@@ -192,7 +192,7 @@ public class UsersOfRoomDialogFragment extends AbstractChatRoomDialogFragment {
    */
   private void onRenderTotalCount(long total) {
     TextView userCount = (TextView) getDialog().findViewById(R.id.room_user_count);
-    userCount.setText(getString(R.string.fmt_room_user_count, total));
+    userCount.setText(getResources().getQuantityString(R.plurals.fmt_room_user_count, (int) total, total));
   }
 
   /**

app/src/main/java/chat/rocket/android/fragment/server_config/LoginPresenter.java

@@ -2,7 +2,7 @@ package chat.rocket.android.fragment.server_config;
 
 import android.support.annotation.NonNull;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 
 import bolts.Task;

app/src/main/java/chat/rocket/android/fragment/server_config/RetryLoginPresenter.java

@@ -2,7 +2,7 @@ package chat.rocket.android.fragment.server_config;
 
 import android.support.annotation.NonNull;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 
 import chat.rocket.android.BackgroundLooper;

app/src/main/java/chat/rocket/android/fragment/sidebar/SidebarMainFragment.java

@@ -224,10 +224,10 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
 
   private void onRenderCurrentUser(User user, RocketChatAbsoluteUrl absoluteUrl) {
     if (user != null && absoluteUrl != null) {
-      new UserRenderer(getContext(), user)
-          .avatarInto(rootView.findViewById(R.id.current_user_avatar), absoluteUrl)
-          .usernameInto(rootView.findViewById(R.id.current_user_name))
-          .statusColorInto(rootView.findViewById(R.id.current_user_status));
+      UserRenderer userRenderer = new UserRenderer(user);
+      userRenderer.showAvatar(rootView.findViewById(R.id.current_user_avatar), hostname);
+      userRenderer.showUsername(rootView.findViewById(R.id.current_user_name));
+      userRenderer.showStatusColor(rootView.findViewById(R.id.current_user_status));
     }
   }
 

app/src/main/java/chat/rocket/android/fragment/sidebar/dialog/AddDirectMessageDialogFragment.java

@@ -5,7 +5,7 @@ import android.os.Bundle;
 import android.view.View;
 import android.widget.AutoCompleteTextView;
 import android.widget.TextView;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import com.jakewharton.rxbinding2.widget.RxTextView;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.CompositeDisposable;
@@ -97,7 +97,7 @@ public class AddDirectMessageDialogFragment extends AbstractAddRoomDialogFragmen
             (realm, text) -> realm.where(RealmUser.class)
                 .contains(RealmUser.USERNAME, text, Case.INSENSITIVE)
                 .findAllSorted(RealmUser.USERNAME),
-            context -> new SuggestUserAdapter(context, rocketChatAbsoluteUrlOptional.get()));
+            context -> new SuggestUserAdapter(context, rocketChatAbsoluteUrlOptional.get(), hostname));
     autoCompleteTextView.setAdapter(adapter);
   }
 

app/src/main/java/chat/rocket/android/helper/AbsoluteUrlHelper.java

 package chat.rocket.android.helper;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 

app/src/main/java/chat/rocket/android/helper/Avatar.kt

-package chat.rocket.android.helper
-
-import chat.rocket.android.widget.AbsoluteUrl
-import chat.rocket.android.widget.RocketChatAvatar
-import java.net.URLEncoder
-
-class Avatar(val absoluteUrl: AbsoluteUrl?, val username: String) {
-
-    val imageUrl: String
-        /** REMARK
-         * This is often a SVG image (see Rocket.Chat:server/startup/avatar.js)
-         */
-        get() {
-            val avatarUrl = "/avatar/" + URLEncoder.encode(username, "UTF-8")
-            if (absoluteUrl == null) {
-                return avatarUrl
-            }
-            return absoluteUrl.from("/avatar/" + URLEncoder.encode(username, "UTF-8"))
-        }
-
-    /**
-     * render avatar into RocketChatAvatar.
-     */
-    fun into(rocketChatAvatar: RocketChatAvatar) {
-        rocketChatAvatar.loadImage(imageUrl)
-    }
-}
\ No newline at end of file

app/src/main/java/chat/rocket/android/helper/RocketChatUserAvatar.kt

+package chat.rocket.android.helper
+
+import java.net.URLEncoder
+
+class RocketChatUserAvatar(val hostname: String, val username: String) {
+
+    val imageUri: String
+        /** REMARK
+         * This is often a SVG image (see Rocket.Chat:server/startup/avatar.js).
+         */
+        get() {
+            return "https://" +
+                    hostname.replace("http://", "").replace("https://", "") +
+                    "/avatar/" +
+                    URLEncoder.encode(username, "UTF-8")
+        }
+}
\ No newline at end of file

app/src/main/java/chat/rocket/android/layouthelper/chatroom/AbstractMessageViewHolder.java

@@ -13,21 +13,24 @@ import chat.rocket.core.SyncState;
 
 public abstract class AbstractMessageViewHolder extends ModelViewHolder<PairedMessage> {
   protected final RocketChatAvatar avatar;
+  protected final ImageView userNotFoundAvatarImageView;
   protected final ImageView errorImageView;
   protected final TextView username;
   protected final TextView subUsername;
   protected final TextView timestamp;
   protected final View userAndTimeContainer;
   protected final AbsoluteUrl absoluteUrl;
+  protected final String hostname;
   protected final View newDayContainer;
   protected final TextView newDayText;
 
   /**
    * constructor WITH hostname.
    */
-  public AbstractMessageViewHolder(View itemView, AbsoluteUrl absoluteUrl) {
+  public AbstractMessageViewHolder(View itemView, AbsoluteUrl absoluteUrl, String hostname) {
     super(itemView);
     avatar = itemView.findViewById(R.id.user_avatar);
+    userNotFoundAvatarImageView = itemView.findViewById(R.id.userNotFoundAvatarImageView);
     errorImageView = itemView.findViewById(R.id.errorImageView);
     username = itemView.findViewById(R.id.username);
     subUsername = itemView.findViewById(R.id.sub_username);
@@ -36,6 +39,7 @@ public abstract class AbstractMessageViewHolder extends ModelViewHolder<PairedMe
     newDayContainer = itemView.findViewById(R.id.newday_container);
     newDayText = itemView.findViewById(R.id.newday_text);
     this.absoluteUrl = absoluteUrl;
+    this.hostname = hostname;
   }
 
   /**

app/src/main/java/chat/rocket/android/layouthelper/chatroom/MessageListAdapter.java

@@ -22,14 +22,16 @@ public class MessageListAdapter extends ExtModelListAdapter<Message, PairedMessa
   private static final int VIEW_TYPE_NORMAL_MESSAGE = 1;
   private static final int VIEW_TYPE_SYSTEM_MESSAGE = 2;
 
+  private String hostname;
   private AbsoluteUrl absoluteUrl;
 
   private boolean autoloadImages = false;
   private boolean hasNext;
   private boolean isLoaded;
 
-  public MessageListAdapter(Context context) {
+  public MessageListAdapter(Context context, String hostname) {
     super(context);
+    this.hostname = hostname;
   }
 
   public void setAbsoluteUrl(AbsoluteUrl absoluteUrl) {
@@ -92,11 +94,11 @@ public class MessageListAdapter extends ExtModelListAdapter<Message, PairedMessa
   protected AbstractMessageViewHolder onCreateRealmModelViewHolder(int viewType, View itemView) {
     switch (viewType) {
       case VIEW_TYPE_NORMAL_MESSAGE:
-        return new MessageNormalViewHolder(itemView, absoluteUrl);
+        return new MessageNormalViewHolder(itemView, absoluteUrl, hostname);
       case VIEW_TYPE_SYSTEM_MESSAGE:
-        return new MessageSystemViewHolder(itemView, absoluteUrl);
+        return new MessageSystemViewHolder(itemView, absoluteUrl, hostname);
       default:
-        return new AbstractMessageViewHolder(itemView, absoluteUrl) {
+        return new AbstractMessageViewHolder(itemView, absoluteUrl, hostname) {
           @Override
           protected void bindMessage(PairedMessage pairedMessage, boolean autoloadImages) {}
         };

app/src/main/java/chat/rocket/android/layouthelper/chatroom/MessageNormalViewHolder.java

@@ -19,8 +19,8 @@ public class MessageNormalViewHolder extends AbstractMessageViewHolder {
   /**
    * constructor WITH hostname.
    */
-  public MessageNormalViewHolder(View itemView, AbsoluteUrl absoluteUrl) {
-    super(itemView, absoluteUrl);
+  public MessageNormalViewHolder(View itemView, AbsoluteUrl absoluteUrl, String hostname) {
+    super(itemView, absoluteUrl, hostname);
     body = itemView.findViewById(R.id.message_body);
     urls = itemView.findViewById(R.id.message_urls);
     attachments = itemView.findViewById(R.id.message_attachments);
@@ -28,12 +28,12 @@ public class MessageNormalViewHolder extends AbstractMessageViewHolder {
 
   @Override
   protected void bindMessage(PairedMessage pairedMessage, boolean autoloadImages) {
-    new MessageRenderer(itemView.getContext(), pairedMessage.target, autoloadImages)
-        .avatarInto(avatar, absoluteUrl)
-        .usernameInto(username, subUsername)
-        .timestampInto(timestamp)
-        .bodyInto(body)
-        .urlsInto(urls)
-        .attachmentsInto(attachments, absoluteUrl);
+    MessageRenderer messageRenderer = new MessageRenderer(pairedMessage.target, autoloadImages);
+    messageRenderer.showAvatar(avatar, hostname, userNotFoundAvatarImageView);
+    messageRenderer.showUsername(username, subUsername);
+    messageRenderer.showTimestampOrMessageState(timestamp);
+    messageRenderer.showBody(body);
+    messageRenderer.showUrl(urls);
+    messageRenderer.showAttachment(attachments, absoluteUrl);
   }
 }

app/src/main/java/chat/rocket/android/layouthelper/chatroom/MessageSystemViewHolder.java

@@ -16,18 +16,17 @@ public class MessageSystemViewHolder extends AbstractMessageViewHolder {
   /**
    * constructor WITH hostname.
    */
-  public MessageSystemViewHolder(View itemView, AbsoluteUrl absoluteUrl) {
-    super(itemView, absoluteUrl);
+  public MessageSystemViewHolder(View itemView, AbsoluteUrl absoluteUrl, String hostname) {
+    super(itemView, absoluteUrl, hostname);
     body = itemView.findViewById(R.id.message_body);
   }
 
   @Override
   protected void bindMessage(PairedMessage pairedMessage, boolean autoloadImages) {
-    new MessageRenderer(itemView.getContext(), pairedMessage.target, autoloadImages)
-        .avatarInto(avatar, absoluteUrl)
-        .usernameInto(username, subUsername)
-        .timestampInto(timestamp);
-
+    MessageRenderer messageRenderer = new MessageRenderer(pairedMessage.target, autoloadImages);
+    messageRenderer.showAvatar(avatar, hostname, userNotFoundAvatarImageView);
+    messageRenderer.showUsername(username, subUsername);
+    messageRenderer.showTimestampOrMessageState(timestamp);
     if (pairedMessage.target != null) {
       body.setText(MessageType.parse(pairedMessage.target.getType())
           .getString(body.getContext(), pairedMessage.target));

app/src/main/java/chat/rocket/android/layouthelper/chatroom/dialog/RoomUserAdapter.java

@@ -24,16 +24,18 @@ public class RoomUserAdapter extends RecyclerView.Adapter<RoomUserViewHolder> {
   private final LayoutInflater inflater;
   private final RealmHelper realmHelper;
   private final AbsoluteUrl absoluteUrl;
+  private final String hostname;
   private List<String> usernames;
 
   /**
    * Constructor with required parameters.
    */
-  public RoomUserAdapter(Context context, RealmHelper realmHelper, AbsoluteUrl absoluteUrl) {
+  public RoomUserAdapter(Context context, RealmHelper realmHelper, AbsoluteUrl absoluteUrl, String hostname) {
     this.context = context;
     this.inflater = LayoutInflater.from(context);
     this.realmHelper = realmHelper;
     this.absoluteUrl = absoluteUrl;
+    this.hostname = hostname;
   }
 
   @Override
@@ -57,14 +59,15 @@ public class RoomUserAdapter extends RecyclerView.Adapter<RoomUserViewHolder> {
           .setUsername(username)
           .setUtcOffset(0)
           .build();
-      new UserRenderer(context, user)
-          .avatarInto(holder.avatar, absoluteUrl)
-          .usernameInto(holder.username);
+
+      UserRenderer userRenderer = new UserRenderer(user);
+      userRenderer.showAvatar(holder.avatar, hostname);
+      userRenderer.showUsername(holder.username);
     } else {
-      new UserRenderer(context, realmUser.asUser())
-          .statusColorInto(holder.status)
-          .avatarInto(holder.avatar, absoluteUrl)
-          .usernameInto(holder.username);
+      UserRenderer userRenderer = new UserRenderer(realmUser.asUser());
+      userRenderer.showAvatar(holder.avatar, hostname);
+      userRenderer.showUsername(holder.username);
+      userRenderer.showStatusColor(holder.status);
     }
   }
 

app/src/main/java/chat/rocket/android/layouthelper/sidebar/dialog/SuggestUserAdapter.java

@@ -16,17 +16,19 @@ import chat.rocket.android.renderer.UserRenderer;
  */
 public class SuggestUserAdapter extends RealmAutoCompleteAdapter<RealmUser> {
   private final AbsoluteUrl absoluteUrl;
+  private final String hostname;
 
-  public SuggestUserAdapter(Context context, AbsoluteUrl absoluteUrl) {
+  public SuggestUserAdapter(Context context, AbsoluteUrl absoluteUrl, String hostname) {
     super(context, R.layout.listitem_room_user, R.id.room_user_name);
     this.absoluteUrl = absoluteUrl;
+    this.hostname = hostname;
   }
 
   @Override
   protected void onBindItemView(View itemView, RealmUser user) {
-    new UserRenderer(itemView.getContext(), user.asUser())
-        .statusColorInto(itemView.findViewById(R.id.room_user_status))
-        .avatarInto(itemView.findViewById(R.id.room_user_avatar), absoluteUrl);
+    UserRenderer userRenderer = new UserRenderer(user.asUser());
+    userRenderer.showStatusColor(itemView.findViewById(R.id.room_user_status));
+    userRenderer.showAvatar(itemView.findViewById(R.id.room_user_avatar), hostname);
   }
 
   @Override

app/src/main/java/chat/rocket/android/renderer/MessageRenderer.java

-package chat.rocket.android.renderer;
-
-import android.content.Context;
-import android.view.View;
-import android.widget.TextView;
-import chat.rocket.android.R;
-import chat.rocket.android.helper.DateTime;
-import chat.rocket.android.helper.TextUtils;
-import chat.rocket.android.widget.AbsoluteUrl;
-import chat.rocket.android.widget.RocketChatAvatar;
-import chat.rocket.android.widget.message.RocketChatMessageAttachmentsLayout;
-import chat.rocket.android.widget.message.RocketChatMessageLayout;
-import chat.rocket.android.widget.message.RocketChatMessageUrlsLayout;
-import chat.rocket.core.SyncState;
-import chat.rocket.core.models.Attachment;
-import chat.rocket.core.models.Message;
-import chat.rocket.core.models.WebContent;
-import java.util.List;
-
-/**
- * Renderer for RealmMessage model.
- */
-public class MessageRenderer extends AbstractRenderer<Message> {
-  private final UserRenderer userRenderer;
-  private final boolean autoloadImages;
-
-  public MessageRenderer(Context context, Message message, boolean autoloadImages) {
-    super(context, message);
-    userRenderer = new UserRenderer(context, message.getUser());
-    this.autoloadImages = autoloadImages;
-  }
-
-  /**
-   * show Avatar image.
-   */
-  public MessageRenderer avatarInto(RocketChatAvatar rocketChatAvatar, AbsoluteUrl absoluteUrl) {
-    if (!shouldHandle(rocketChatAvatar)) {
-      return this;
-    }
-
-    if (TextUtils.isEmpty(object.getAvatar())) {
-      userRenderer.avatarInto(rocketChatAvatar, absoluteUrl);
-      // Avatar from oauth providers
-    } else {
-      rocketChatAvatar.loadImage(object.getAvatar());
-    }
-    return this;
-  }
-
-  /**
-   * show Username in textView.
-   */
-  public MessageRenderer usernameInto(TextView usernameTextView, TextView subUsernameTextView) {
-    if (TextUtils.isEmpty(object.getAlias())) {
-      userRenderer.usernameInto(usernameTextView);
-      if (subUsernameTextView != null) {
-        subUsernameTextView.setVisibility(View.GONE);
-      }
-    } else {
-      aliasAndUsernameInto(usernameTextView, subUsernameTextView);
-    }
-    return this;
-  }
-
-  /**
-   * show timestamp in textView.
-   */
-  public MessageRenderer timestampInto(TextView textView) {
-    if (!shouldHandle(textView)) {
-      return this;
-    }
-
-    switch (object.getSyncState()) {
-      case SyncState.SYNCING:
-        textView.setText(R.string.sending);
-        break;
-      case SyncState.NOT_SYNCED:
-        textView.setText(R.string.not_synced);
-        break;
-      case SyncState.FAILED:
-        textView.setText(R.string.failed_to_sync);
-        break;
-      default:
-        textView.setText(DateTime.fromEpocMs(object.getTimestamp(), DateTime.Format.TIME));
-        break;
-    }
-    return this;
-  }
-
-  /**
-   * show body in RocketChatMessageLayout.
-   */
-  public MessageRenderer bodyInto(RocketChatMessageLayout rocketChatMessageLayout) {
-    if (!shouldHandle(rocketChatMessageLayout)) {
-      return this;
-    }
-
-    rocketChatMessageLayout.setText(object.getMessage());
-    return this;
-  }
-
-  /**
-   * show urls in RocketChatMessageUrlsLayout.
-   */
-  public MessageRenderer urlsInto(RocketChatMessageUrlsLayout urlsLayout) {
-    if (!shouldHandle(urlsLayout)) {
-      return this;
-    }
-
-    List<WebContent> webContents = object.getWebContents();
-    if (webContents == null || webContents.size() == 0) {
-      urlsLayout.setVisibility(View.GONE);
-    } else {
-      urlsLayout.setVisibility(View.VISIBLE);
-      urlsLayout.setUrls(webContents, autoloadImages);
-    }
-    return this;
-  }
-
-  /**
-   * show urls in RocketChatMessageUrlsLayout.
-   */
-  public MessageRenderer attachmentsInto(RocketChatMessageAttachmentsLayout attachmentsLayout, AbsoluteUrl absoluteUrl) {
-    if (!shouldHandle(attachmentsLayout)) {
-      return this;
-    }
-
-    List<Attachment> attachments = object.getAttachments();
-    if (attachments == null || attachments.size() == 0) {
-      attachmentsLayout.setVisibility(View.GONE);
-    } else {
-      attachmentsLayout.setVisibility(View.VISIBLE);
-      attachmentsLayout.setAbsoluteUrl(absoluteUrl);
-      attachmentsLayout.setAttachments(attachments, autoloadImages);
-    }
-    return this;
-  }
-
-  private void aliasAndUsernameInto(TextView aliasTextView, TextView usernameTextView) {
-    if (shouldHandle(aliasTextView)) {
-      aliasTextView.setText(object.getAlias());
-    }
-
-    if (shouldHandle(usernameTextView)) {
-      if (object.getUser() != null) {
-        usernameTextView.setText("@" + object.getUser().getUsername());
-        usernameTextView.setVisibility(View.VISIBLE);
-      } else {
-        usernameTextView.setVisibility(View.GONE);
-      }
-    }
-  }
-
-}
\ No newline at end of file

app/src/main/java/chat/rocket/android/renderer/MessageRenderer.kt

+package chat.rocket.android.renderer
+
+import android.view.View
+import android.widget.ImageView
+import android.widget.TextView
+import chat.rocket.android.R
+import chat.rocket.android.helper.DateTime
+import chat.rocket.android.helper.RocketChatUserAvatar
+import chat.rocket.android.widget.AbsoluteUrl
+import chat.rocket.android.widget.RocketChatAvatar
+import chat.rocket.android.widget.message.RocketChatMessageAttachmentsLayout
+import chat.rocket.android.widget.message.RocketChatMessageLayout
+import chat.rocket.android.widget.message.RocketChatMessageUrlsLayout
+import chat.rocket.core.SyncState
+import chat.rocket.core.models.Message
+
+class MessageRenderer(val message: Message, val autoLoadImage: Boolean) {
+
+    /**
+     * Show user's avatar image in RocketChatAvatar widget.
+     */
+    fun showAvatar(rocketChatAvatarWidget: RocketChatAvatar, hostname: String, userNotFoundAvatarImageView: ImageView) {
+        if (message.avatar != null) {
+            // Load user's avatar image from Oauth provider URI.
+            rocketChatAvatarWidget.loadImage(message.avatar)
+        } else {
+            val username: String? = message.user?.username
+            if (username != null) {
+                // Load user's avatar image from Rocket.Chat URI.
+                rocketChatAvatarWidget.loadImage(RocketChatUserAvatar(hostname, username).imageUri)
+                userNotFoundAvatarImageView.visibility = View.GONE
+                rocketChatAvatarWidget.visibility = View.VISIBLE
+            } else {
+                rocketChatAvatarWidget.visibility = View.GONE
+                userNotFoundAvatarImageView.visibility = View.VISIBLE
+            }
+        }
+    }
+
+    /**
+     * Show username in textView.
+     */
+    fun showUsername(usernameTextView: TextView, subUsernameTextView: TextView?) {
+        if (message.alias == null) {
+            usernameTextView.text = message.user?.username ?: usernameTextView.context.getText(R.string.user_not_found)
+        } else {
+            usernameTextView.text = message.alias
+            val username: String? = message.user?.username
+            if (username != null && subUsernameTextView != null) {
+                subUsernameTextView.text = subUsernameTextView.context.getString(R.string.sub_username, username)
+                subUsernameTextView.visibility = View.VISIBLE
+            }
+        }
+    }
+
+    /**
+     * Show timestamp or message state in textView.
+     */
+    fun showTimestampOrMessageState(textView: TextView) {
+        when (message.syncState) {
+            SyncState.SYNCING -> textView.text = textView.context.getText(R.string.sending)
+            SyncState.NOT_SYNCED -> textView.text = textView.context.getText(R.string.not_synced)
+            SyncState.FAILED -> textView.text = textView.context.getText(R.string.failed_to_sync)
+            else -> textView.text = DateTime.fromEpocMs(message.timestamp, DateTime.Format.TIME)
+        }
+    }
+
+    /**
+     * Show body in RocketChatMessageLayout widget.
+     */
+    fun showBody(rocketChatMessageLayout: RocketChatMessageLayout) {
+        rocketChatMessageLayout.setText(message.message)
+    }
+
+    /**
+     * Show urls in RocketChatMessageUrlsLayout widget.
+     */
+    fun showUrl(rocketChatMessageUrlsLayout: RocketChatMessageUrlsLayout) {
+        val webContents = message.webContents
+        if (webContents == null || webContents.isEmpty()) {
+            rocketChatMessageUrlsLayout.visibility = View.GONE
+        } else {
+            rocketChatMessageUrlsLayout.setUrls(webContents, autoLoadImage)
+            rocketChatMessageUrlsLayout.visibility = View.VISIBLE
+        }
+    }
+
+    /**
+     * show attachments in RocketChatMessageAttachmentsLayout widget.
+     */
+    fun showAttachment(rocketChatMessageAttachmentsLayout: RocketChatMessageAttachmentsLayout, absoluteUrl: AbsoluteUrl?) {
+        val attachments = message.attachments
+        if (attachments == null || attachments.isEmpty()) {
+            rocketChatMessageAttachmentsLayout.visibility = View.GONE
+        } else {
+            rocketChatMessageAttachmentsLayout.setAbsoluteUrl(absoluteUrl)
+            rocketChatMessageAttachmentsLayout.setAttachments(attachments, autoLoadImage)
+            rocketChatMessageAttachmentsLayout.visibility = View.VISIBLE
+        }
+    }
+}
\ No newline at end of file

app/src/main/java/chat/rocket/android/renderer/RocketChatUserStatusProvider.java

-package chat.rocket.android.renderer;
-
-import android.support.annotation.DrawableRes;
-
-import chat.rocket.android.R;
-import chat.rocket.android.widget.helper.UserStatusProvider;
-import chat.rocket.core.models.User;
-
-public class RocketChatUserStatusProvider implements UserStatusProvider {
-
-  private static RocketChatUserStatusProvider instance;
-
-  private RocketChatUserStatusProvider() {
-  }
-
-  public static RocketChatUserStatusProvider getInstance() {
-    if (instance == null) {
-      instance = new RocketChatUserStatusProvider();
-    }
-
-    return instance;
-  }
-
-  @Override
-  @DrawableRes
-  public int getStatusResId(String status) {
-    if (User.STATUS_ONLINE.equals(status)) {
-      return R.drawable.userstatus_online;
-    } else if (User.STATUS_AWAY.equals(status)) {
-      return R.drawable.userstatus_away;
-    } else if (User.STATUS_BUSY.equals(status)) {
-      return R.drawable.userstatus_busy;
-    } else if (User.STATUS_OFFLINE.equals(status)) {
-      return R.drawable.userstatus_offline;
-    }
-
-    // unknown status is rendered as "offline" status.
-    return R.drawable.userstatus_offline;
-  }
-}

app/src/main/java/chat/rocket/android/renderer/RocketChatUserStatusProvider.kt

+package chat.rocket.android.renderer
+
+import chat.rocket.android.R
+import chat.rocket.android.widget.helper.UserStatusProvider
+import chat.rocket.core.models.User
+
+object RocketChatUserStatusProvider: UserStatusProvider {
+
+    override fun getStatusResId(status: String?): Int {
+        var userStatusDrawableId = R.drawable.userstatus_offline
+        when (status) {
+            User.STATUS_ONLINE -> {
+                userStatusDrawableId = R.drawable.userstatus_online
+            }
+            User.STATUS_AWAY -> {
+                userStatusDrawableId = R.drawable.userstatus_away
+            }
+            User.STATUS_BUSY -> {
+                userStatusDrawableId = R.drawable.userstatus_busy
+            }
+        }
+        return userStatusDrawableId
+    }
+}
\ No newline at end of file

app/src/main/java/chat/rocket/android/renderer/UserRenderer.java

-package chat.rocket.android.renderer;
-
-import android.content.Context;
-import android.widget.ImageView;
-import android.widget.TextView;
-import chat.rocket.android.helper.Avatar;
-import chat.rocket.android.helper.TextUtils;
-import chat.rocket.android.widget.AbsoluteUrl;
-import chat.rocket.android.widget.RocketChatAvatar;
-import chat.rocket.core.models.User;
-
-/**
- * Renderer for RealmUser model.
- */
-public class UserRenderer extends AbstractRenderer<User> {
-
-  public UserRenderer(Context context, User user) {
-    super(context, user);
-  }
-
-  /**
-   * show Avatar image
-   */
-  public UserRenderer avatarInto(RocketChatAvatar rocketChatAvatar, AbsoluteUrl absoluteUrl) {
-    if (!shouldHandle(rocketChatAvatar)) {
-      return this;
-    }
-
-    if (!TextUtils.isEmpty(object.getUsername())) {
-      new Avatar(absoluteUrl, object.getUsername())
-          .into(rocketChatAvatar);
-    }
-    return this;
-  }
-
-  /**
-   * show Username in textView
-   */
-  public UserRenderer usernameInto(TextView textView) {
-    if (!shouldHandle(textView)) {
-      return this;
-    }
-
-    textView.setText(object.getUsername());
-
-    return this;
-  }
-
-  /**
-   * show user's status color into imageView.
-   */
-  public UserRenderer statusColorInto(ImageView imageView) {
-    if (!shouldHandle(imageView)) {
-      return this;
-    }
-
-    String status = object.getStatus();
-    imageView.setImageResource(RocketChatUserStatusProvider.getInstance().getStatusResId(status));
-
-    return this;
-  }
-}

app/src/main/java/chat/rocket/android/renderer/UserRenderer.kt

+package chat.rocket.android.renderer
+
+import android.view.View
+import android.widget.ImageView
+import android.widget.TextView
+import chat.rocket.android.R
+import chat.rocket.android.helper.RocketChatUserAvatar
+import chat.rocket.android.widget.RocketChatAvatar
+import chat.rocket.core.models.User
+
+class UserRenderer(val user: User) {
+
+    /**
+     * Show user's avatar image in RocketChatAvatar widget.
+     */
+    fun showAvatar(rocketChatAvatarWidget: RocketChatAvatar, hostname: String) {
+        val username: String? = user.username
+        if (username != null) {
+            rocketChatAvatarWidget.loadImage(RocketChatUserAvatar(hostname, username).imageUri)
+        } else {
+            rocketChatAvatarWidget.visibility = View.GONE
+        }
+    }
+
+    /**
+     * Show username in textView.
+     */
+    fun showUsername(textView: TextView) {
+        textView.text = user.username ?: textView.context.getText(R.string.user_not_found)
+    }
+
+    /**
+     * Show user's status color in imageView.
+     */
+    fun showStatusColor(imageView: ImageView) {
+        val userStatus: String? = user.status
+        if (userStatus != null) {
+            imageView.setImageResource(RocketChatUserStatusProvider.getStatusResId(userStatus))
+        } else {
+            imageView.visibility = View.GONE
+        }
+    }
+}
\ No newline at end of file

app/src/main/java/chat/rocket/android/service/ConnectivityManagerInternal.java

@@ -23,4 +23,6 @@ import chat.rocket.core.models.ServerInfo;
   void notifyConnectionEstablished(String hostname, String session);
 
   void notifyConnectionLost(String hostname, int reason);
+
+  void notifyConnecting(String hostname);
 }

app/src/main/java/chat/rocket/android/service/RealmBasedConnectivityManager.java

@@ -133,6 +133,14 @@ import rx.subjects.PublishSubject;
         new ServerConnectivity(hostname, ServerConnectivity.STATE_DISCONNECTED));
   }
 
+  @DebugLog
+  @Override
+  public void notifyConnecting(String hostname) {
+    serverConnectivityList.put(hostname, ServerConnectivity.STATE_CONNECTING);
+    connectivitySubject.onNext(
+            new ServerConnectivity(hostname, ServerConnectivity.STATE_CONNECTING));
+  }
+
   @Override
   public Observable<ServerConnectivity> getServerConnectivityAsObservable() {
     return Observable.concat(Observable.from(getCurrentConnectivityList()), connectivitySubject);

app/src/main/java/chat/rocket/android/service/RocketChatService.java

@@ -9,6 +9,7 @@ import android.os.IBinder;
 import android.support.annotation.Nullable;
 
 import java.util.HashMap;
+import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
 
 import chat.rocket.android.activity.MainActivity;
@@ -24,6 +25,7 @@ public class RocketChatService extends Service implements ConnectivityServiceInt
 
   private ConnectivityManagerInternal connectivityManager;
   private HashMap<String, RocketChatWebSocketThread> webSocketThreads;
+  private Semaphore webSocketThreadLock = new Semaphore(1);
 
   public class LocalBinder extends Binder {
     ConnectivityServiceInterface getServiceInterface() {
@@ -49,6 +51,7 @@ public class RocketChatService extends Service implements ConnectivityServiceInt
     context.unbindService(serviceConnection);
   }
 
+  @DebugLog
   @Override
   public void onCreate() {
     super.onCreate();
@@ -57,6 +60,7 @@ public class RocketChatService extends Service implements ConnectivityServiceInt
     webSocketThreads = new HashMap<>();
   }
 
+  @DebugLog
   @Override
   public int onStartCommand(Intent intent, int flags, int startId) {
     connectivityManager.ensureConnections();
@@ -106,12 +110,17 @@ public class RocketChatService extends Service implements ConnectivityServiceInt
   @DebugLog
   private Single<RocketChatWebSocketThread> getOrCreateWebSocketThread(String hostname) {
     return Single.defer(() -> {
+      webSocketThreadLock.acquire();
       if (webSocketThreads.containsKey(hostname)) {
         RocketChatWebSocketThread thread = webSocketThreads.get(hostname);
+        webSocketThreadLock.release();
         return Single.just(thread);
       }
       return RocketChatWebSocketThread.getStarted(getApplicationContext(), hostname)
-          .doOnSuccess(thread -> webSocketThreads.put(hostname, thread));
+          .doOnSuccess(thread -> {
+            webSocketThreads.put(hostname, thread);
+            webSocketThreadLock.release();
+          });
     });
   }
 

app/src/main/java/chat/rocket/android/service/RocketChatWebSocketThread.java

@@ -3,24 +3,26 @@ package chat.rocket.android.service;
 import android.content.Context;
 import android.os.Handler;
 import android.os.HandlerThread;
+
 import org.json.JSONObject;
 
 import java.lang.reflect.Constructor;
 import java.util.ArrayList;
 import java.util.Iterator;
+import java.util.concurrent.TimeUnit;
+
 import bolts.Task;
+import chat.rocket.android.RocketChatCache;
 import chat.rocket.android.api.DDPClientWrapper;
 import chat.rocket.android.api.MethodCallHelper;
 import chat.rocket.android.helper.LogIfError;
+import chat.rocket.android.helper.RxHelper;
 import chat.rocket.android.helper.TextUtils;
 import chat.rocket.android.log.RCLog;
-import chat.rocket.core.models.ServerInfo;
-import chat.rocket.persistence.realm.models.internal.RealmSession;
-import chat.rocket.persistence.realm.RealmHelper;
-import chat.rocket.persistence.realm.RealmStore;
 import chat.rocket.android.service.ddp.base.ActiveUsersSubscriber;
 import chat.rocket.android.service.ddp.base.LoginServiceConfigurationSubscriber;
 import chat.rocket.android.service.ddp.base.UserDataSubscriber;
+import chat.rocket.android.service.ddp.stream.StreamRoomMessage;
 import chat.rocket.android.service.observer.CurrentUserObserver;
 import chat.rocket.android.service.observer.FileUploadingToUrlObserver;
 import chat.rocket.android.service.observer.FileUploadingWithUfsObserver;
@@ -32,8 +34,13 @@ import chat.rocket.android.service.observer.NewMessageObserver;
 import chat.rocket.android.service.observer.PushSettingsObserver;
 import chat.rocket.android.service.observer.SessionObserver;
 import chat.rocket.android.service.observer.TokenLoginObserver;
+import chat.rocket.core.models.ServerInfo;
+import chat.rocket.persistence.realm.RealmHelper;
+import chat.rocket.persistence.realm.RealmStore;
+import chat.rocket.persistence.realm.models.internal.RealmSession;
 import hugo.weaving.DebugLog;
 import rx.Single;
+import rx.subscriptions.CompositeSubscription;
 
 /**
  * Thread for handling WebSocket connection.
@@ -62,6 +69,7 @@ public class RocketChatWebSocketThread extends HandlerThread {
   private final ArrayList<Registrable> listeners = new ArrayList<>();
   private DDPClientWrapper ddpClient;
   private boolean listenersRegistered;
+  private RocketChatCache rocketChatCache;
   private final DDPClientRef ddpClientRef = new DDPClientRef() {
     @Override
     public DDPClientWrapper get() {
@@ -69,7 +77,6 @@ public class RocketChatWebSocketThread extends HandlerThread {
     }
   };
 
-
   private static class KeepAliveTimer {
     private long lastTime;
     private final long thresholdMs;
@@ -96,6 +103,7 @@ public class RocketChatWebSocketThread extends HandlerThread {
     this.hostname = hostname;
     this.realmHelper = RealmStore.getOrCreate(hostname);
     this.connectivityManager = ConnectivityManager.getInstanceForInternal(appContext);
+    this.rocketChatCache = new RocketChatCache(appContext);
   }
 
   /**
@@ -147,7 +155,7 @@ public class RocketChatWebSocketThread extends HandlerThread {
       return Single.fromEmitter(emitter -> {
         new Handler(getLooper()).post(() -> {
           RCLog.d("thread %s: terminated()", Thread.currentThread().getId());
-          unregisterListeners();
+          unregisterListenersAndClose();
           connectivityManager.notifyConnectionLost(hostname,
               ConnectivityManagerInternal.REASON_CLOSED_BY_USER);
           RocketChatWebSocketThread.super.quit();
@@ -196,9 +204,9 @@ public class RocketChatWebSocketThread extends HandlerThread {
         public void run() {
           ddpClient.ping().continueWith(task -> {
             if (task.isFaulted()) {
-              RCLog.e(task.getError());
+              Exception error = task.getError();
+              RCLog.e(error);
               emitter.onSuccess(false);
-              ddpClient.close();
             } else {
               keepAliveTimer.update();
               emitter.onSuccess(true);
@@ -232,9 +240,26 @@ public class RocketChatWebSocketThread extends HandlerThread {
 
                 // handling WebSocket#onClose() callback.
                 task.getResult().client.getOnCloseCallback().onSuccess(_task -> {
-                  if (listenersRegistered) {
-                    terminate();
-                  }
+                  ddpClient.close();
+                  forceInvalidateTokens();
+                  connectivityManager.notifyConnecting(hostname);
+                  // Needed to use subscriptions because of legacy code.
+                  // TODO: Should update to RxJava 2
+                  final CompositeSubscription subscriptions = new CompositeSubscription();
+                  subscriptions.add(
+                    connect().retryWhen(RxHelper.exponentialBackoff(3, 500, TimeUnit.MILLISECONDS))
+                    .subscribe(
+                        connected -> {
+                          if (!connected) {
+                            connectivityManager.notifyConnectionLost(
+                                    hostname, ConnectivityManagerInternal.REASON_NETWORK_ERROR
+                            );
+                          }
+                          subscriptions.clear();
+                        },
+                        err -> logErrorAndUnsubscribe(subscriptions, err)
+                    )
+                  );
                   return null;
                 });
 
@@ -265,6 +290,11 @@ public class RocketChatWebSocketThread extends HandlerThread {
         }));
   }
 
+  private void logErrorAndUnsubscribe(CompositeSubscription subscriptions, Throwable err) {
+    RCLog.e(err);
+    subscriptions.clear();
+  }
+
   @DebugLog
   private Single<Boolean> connect() {
     return connectDDPClient()
@@ -284,7 +314,7 @@ public class RocketChatWebSocketThread extends HandlerThread {
     return new MethodCallHelper(realmHelper, ddpClientRef).getPermissions();
   }
 
-  //@DebugLog
+  @DebugLog
   private void registerListeners() {
     if (!Thread.currentThread().getName().equals("RC_thread_" + hostname)) {
       // execute in Looper.
@@ -293,7 +323,7 @@ public class RocketChatWebSocketThread extends HandlerThread {
     }
 
     if (listenersRegistered) {
-      return;
+      unregisterListeners();
     }
     listenersRegistered = true;
 
@@ -308,12 +338,30 @@ public class RocketChatWebSocketThread extends HandlerThread {
           registrable.register();
           listeners.add(registrable);
         }
+        // Register for room stream messages
+        String roomId = rocketChatCache.getSelectedRoomId();
+        if (roomId != null && !roomId.isEmpty()) {
+          StreamRoomMessage streamRoomMessage = new StreamRoomMessage(
+                  appContext, hostname, realmHelper, ddpClientRef, roomId
+          );
+          streamRoomMessage.register();
+          listeners.add(streamRoomMessage);
+        }
       } catch (Exception exception) {
         RCLog.w(exception, "Failed to register listeners!!");
       }
     }
   }
 
+  @DebugLog
+  private void unregisterListenersAndClose() {
+   unregisterListeners();
+    if (ddpClient != null) {
+      ddpClient.close();
+      ddpClient = null;
+    }
+  }
+
   @DebugLog
   private void unregisterListeners() {
     Iterator<Registrable> iterator = listeners.iterator();
@@ -323,9 +371,5 @@ public class RocketChatWebSocketThread extends HandlerThread {
       iterator.remove();
     }
     listenersRegistered = false;
-    if (ddpClient != null) {
-      ddpClient.close();
-      ddpClient = null;
-    }
   }
 }

app/src/main/java/chat/rocket/android/service/ServerConnectivity.java

@@ -6,7 +6,7 @@ package chat.rocket.android.service;
 public class ServerConnectivity {
   public static final int STATE_CONNECTED = 1;
   public static final int STATE_DISCONNECTED = 2;
-  /*package*/ static final int STATE_CONNECTING = 3;
+  public static final int STATE_CONNECTING = 3;
   /*package*/ static final int STATE_DISCONNECTING = 4;
 
   public final String hostname;

app/src/main/java/chat/rocket/android/service/ddp/AbstractDDPDocEventSubscriber.java

@@ -185,7 +185,7 @@ public abstract class AbstractDDPDocEventSubscriber implements Registrable {
     if (rxSubscription != null) {
       rxSubscription.dispose();
     }
-    if (!TextUtils.isEmpty(subscriptionId)) {
+    if (!TextUtils.isEmpty(subscriptionId) && ddpClientRef.get() != null) {
       ddpClientRef.get().unsubscribe(subscriptionId).continueWith(new LogIfError());
     }
   }

app/src/main/java/chat/rocket/android/service/internal/AbstractRocketChatCacheObserver.java

@@ -2,6 +2,7 @@ package chat.rocket.android.service.internal;
 
 import android.content.Context;
 
+import chat.rocket.android.log.RCLog;
 import io.reactivex.disposables.CompositeDisposable;
 
 import chat.rocket.android.RocketChatCache;
@@ -47,7 +48,7 @@ public abstract class AbstractRocketChatCacheObserver implements Registrable {
     compositeDisposable.add(
         new RocketChatCache(context)
             .getSelectedRoomIdPublisher()
-            .subscribe(this::updateRoomIdWith)
+            .subscribe(this::updateRoomIdWith, RCLog::e)
     );
   }
 

app/src/main/java/chat/rocket/android/service/observer/MethodCallObserver.java

 package chat.rocket.android.service.observer;
 
 import android.content.Context;
-import io.realm.Realm;
-import io.realm.RealmResults;
+
 import org.json.JSONObject;
 
 import java.util.List;
+
 import chat.rocket.android.helper.CheckSum;
 import chat.rocket.android.helper.LogIfError;
-import chat.rocket.android_ddp.rx.RxWebSocketCallback;
-import chat.rocket.core.SyncState;
-import chat.rocket.persistence.realm.models.internal.MethodCall;
-import chat.rocket.persistence.realm.RealmHelper;
 import chat.rocket.android.service.DDPClientRef;
 import chat.rocket.android_ddp.DDPClientCallback;
+import chat.rocket.core.SyncState;
+import chat.rocket.persistence.realm.RealmHelper;
+import chat.rocket.persistence.realm.models.internal.MethodCall;
+import io.realm.Realm;
+import io.realm.RealmResults;
 
 /**
  * Observing MethodCall record, executing RPC if needed.
@@ -117,9 +118,6 @@ public class MethodCallObserver extends AbstractModelObserver<MethodCall> {
           } else if (exception instanceof DDPClientCallback.RPC.Timeout) {
             // temp "fix"- we need to rewrite the connection layer a bit
             errMessage = "{\"message\": \"Connection Timeout\"}";
-          } else if (exception instanceof RxWebSocketCallback.Failure) {
-            // temp "fix"- we need to rewrite the connection layer a bit
-            errMessage = "{\"message\": \"Connection Failure\"}";
           } else {
             errMessage = exception.getMessage();
           }

app/src/main/res/drawable/ic_user_not_found_avatar_black_24dp.xml

+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:pathData="M-0,0L24,0L24,24L-0,24L-0,0ZM11.963,17.661L12.036,17.661L17.162,17.661C17.162,13.975 13.979,13.915 13.178,12.982L13.082,12.474C14.095,11.946 14.807,10.699 14.807,9.245C14.807,7.313 13.55,5.746 12,5.746C10.45,5.746 9.193,7.313 9.193,9.245C9.193,10.712 9.917,11.966 10.944,12.486L10.86,12.933C10.129,13.913 6.837,13.912 6.837,17.661L11.963,17.661Z"
+        android:fillColor="#FF000000"/>
+</vector>
\ No newline at end of file

app/src/main/res/layout/list_item_normal_message.xml

@@ -20,6 +20,14 @@
       android:layout_height="32dp"
       android:layout_margin="8dp" />
 
+    <ImageView
+      android:id="@+id/userNotFoundAvatarImageView"
+      android:layout_width="32dp"
+      android:layout_height="32dp"
+      android:layout_margin="8dp"
+      app:srcCompat="@drawable/ic_user_not_found_avatar_black_24dp"
+      android:visibility="gone" />
+
     <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
@@ -51,7 +59,8 @@
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:textAppearance="@style/TextAppearance.RocketChat.Message.SubUsername"
-          tools:text="\@John Doe" />
+          tools:text="\@John Doe"
+          android:visibility="gone" />
 
         <Space
           android:layout_width="@dimen/margin_8"

app/src/main/res/layout/list_item_system_message.xml

@@ -19,6 +19,14 @@
       android:layout_height="32dp"
       android:layout_margin="8dp" />
 
+    <ImageView
+      android:id="@+id/userNotFoundAvatarImageView"
+      android:layout_width="32dp"
+      android:layout_height="32dp"
+      android:layout_margin="8dp"
+      app:srcCompat="@drawable/ic_user_not_found_avatar_black_24dp"
+      android:visibility="gone" />
+
     <LinearLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"

app/src/main/res/values/strings.xml

@@ -14,20 +14,28 @@
 
     <string name="start_of_conversation">Start of conversation</string>
     <string name="users_of_room_title">Members List</string>
-    <string name="fmt_room_user_count">Total: %,d users</string>
+    <plurals name="fmt_room_user_count">
+        <item quantity="one">Total: %,d user</item>
+        <item quantity="other">Total: %,d users</item>
+    </plurals>
     <string name="sending">Sending…</string>
     <string name="not_synced">Not synced</string>
     <string name="failed_to_sync">Failed to sync</string>
     <string name="resend">Resend</string>
     <string name="discard">Discard</string>
 
-    <string name="fmt_dialog_view_latest_message_title">New %d messages</string>
+    <plurals name="fmt_dialog_view_latest_message_title">
+        <item quantity="one">New %d message</item>
+        <item quantity="other">New %d messages</item>
+    </plurals>
     <string name="dialog_view_latest_message_action">View</string>
 
     <string name="file_uploading_title">Uploading…</string>
 
     <string name="dialog_user_registration_email">Email</string>
     <string name="dialog_user_registration_username">Username</string>
+    <string name="sub_username">\@%s</string>
+    <string name="user_not_found">User not found</string>
     <string name="dialog_user_registration_password">Password</string>
     <string name="fragment_home_welcome_message">Welcome to Rocket.Chat.Android\nSelect a channel from the drawer.</string>
     <string name="fragment_input_hostname_hostname">Hostname</string>

circle.yml

@@ -7,7 +7,7 @@
 machine:
   environment:
     ANDROID_HOME: /usr/local/android-sdk-linux
-    GRADLE_OPTS: '-Dorg.gradle.jvmargs="-Xmx2048m -XX:+HeapDumpOnOutOfMemoryError"'
+    GRADLE_OPTS: '-Dorg.gradle.jvmargs="-Xmx1536m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError"'
 
 dependencies:
   pre:

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmLoginServiceConfigurationRepository.java

@@ -2,7 +2,7 @@ package chat.rocket.persistence.realm.repositories;
 
 import android.os.Looper;
 import android.support.v4.util.Pair;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmMessageRepository.java

@@ -3,7 +3,7 @@ package chat.rocket.persistence.realm.repositories;
 import android.os.Looper;
 import android.support.v4.util.Pair;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 
 import io.reactivex.Flowable;
 import io.reactivex.Single;

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmPermissionRepository.java

@@ -2,7 +2,7 @@ package chat.rocket.persistence.realm.repositories;
 
 import android.os.Looper;
 import android.support.v4.util.Pair;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmPublicSettingRepository.java

@@ -2,7 +2,7 @@ package chat.rocket.persistence.realm.repositories;
 
 import android.os.Looper;
 import android.support.v4.util.Pair;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmRoomRepository.java

@@ -2,7 +2,7 @@ package chat.rocket.persistence.realm.repositories;
 
 import android.os.Looper;
 import android.support.v4.util.Pair;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmRoomRoleRepository.java

@@ -2,7 +2,7 @@ package chat.rocket.persistence.realm.repositories;
 
 import android.os.Looper;
 import android.support.v4.util.Pair;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmServerInfoRepository.java

@@ -2,7 +2,7 @@ package chat.rocket.persistence.realm.repositories;
 
 import android.os.Looper;
 import android.support.v4.util.Pair;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmSessionRepository.java

@@ -2,7 +2,7 @@ package chat.rocket.persistence.realm.repositories;
 
 import android.os.Looper;
 import android.support.v4.util.Pair;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 import io.reactivex.android.schedulers.AndroidSchedulers;

persistence-realm/src/main/java/chat/rocket/persistence/realm/repositories/RealmUserRepository.java

@@ -2,7 +2,7 @@ package chat.rocket.persistence.realm.repositories;
 
 import android.os.Looper;
 import android.support.v4.util.Pair;
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.realm.Case;

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/RocketChatWidgets.java

 package chat.rocket.android.widget;
 
 import android.content.Context;
-import chat.rocket.android.widget.fresco.CustomImageFormatConfigurator;
+
 import com.facebook.common.logging.FLog;
 import com.facebook.drawee.backends.pipeline.DraweeConfig;
 import com.facebook.drawee.backends.pipeline.Fresco;
@@ -9,8 +9,11 @@ import com.facebook.imagepipeline.backends.okhttp3.OkHttpImagePipelineConfigFact
 import com.facebook.imagepipeline.core.ImagePipelineConfig;
 import com.facebook.imagepipeline.listener.RequestListener;
 import com.facebook.imagepipeline.listener.RequestLoggingListener;
+
 import java.util.HashSet;
 import java.util.Set;
+
+import chat.rocket.android.widget.fresco.CustomImageFormatConfigurator;
 import okhttp3.OkHttpClient;
 
 public class RocketChatWidgets {

rocket-chat-core/build.gradle

 plugins {
-    id "org.jetbrains.kotlin.jvm" version "1.1.2-2"
+    id "org.jetbrains.kotlin.jvm" version "1.1.3-2"
 }
 
 apply plugin: 'idea'
@@ -14,9 +14,9 @@ dependencies {
 
     compile 'io.reactivex.rxjava2:rxjava:2.1.0'
 
-    compile 'com.fernandocejas:arrow:1.0.0'
+    compile 'com.hadisatrio:Optional:v1.0.1'
 
-    compile 'com.google.auto.value:auto-value:1.3'
+    compileOnly 'com.google.auto.value:auto-value:1.3'
     kapt 'com.google.auto.value:auto-value:1.3'
     kapt 'com.gabrielittner.auto.value:auto-value-with:1.0.0'
 

rocket-chat-core/src/main/java/chat/rocket/core/interactors/CanCreateRoomInteractor.kt

@@ -6,7 +6,7 @@ import io.reactivex.Flowable
 import io.reactivex.Single
 
 import chat.rocket.core.repositories.UserRepository
-import com.fernandocejas.arrow.optional.Optional
+import com.hadisatrio.optional.Optional
 import io.reactivex.functions.Function3
 
 class CanCreateRoomInteractor(private val userRepository: UserRepository,

rocket-chat-core/src/main/java/chat/rocket/core/interactors/EditMessageInteractor.kt

@@ -5,7 +5,7 @@ import chat.rocket.core.PublicSettingsConstants
 import chat.rocket.core.models.*
 import chat.rocket.core.repositories.*
 import chat.rocket.core.utils.Pair
-import com.fernandocejas.arrow.optional.Optional
+import com.hadisatrio.optional.Optional
 import io.reactivex.Single
 import io.reactivex.functions.Function4
 

rocket-chat-core/src/main/java/chat/rocket/core/interactors/MessageInteractor.kt

 package chat.rocket.core.interactors
 
-import com.fernandocejas.arrow.optional.Optional
+import com.hadisatrio.optional.Optional
 import io.reactivex.Flowable
 import io.reactivex.Single
 import java.util.UUID

rocket-chat-core/src/main/java/chat/rocket/core/interactors/PermissionInteractor.kt

@@ -5,7 +5,7 @@ import chat.rocket.core.models.Room
 import chat.rocket.core.models.RoomRole
 import chat.rocket.core.repositories.*
 import chat.rocket.core.utils.Pair
-import com.fernandocejas.arrow.optional.Optional
+import com.hadisatrio.optional.Optional
 import io.reactivex.Single
 import io.reactivex.functions.BiFunction
 

rocket-chat-core/src/main/java/chat/rocket/core/interactors/SessionInteractor.kt

 package chat.rocket.core.interactors
 
-import com.fernandocejas.arrow.optional.Optional
+import com.hadisatrio.optional.Optional
 import io.reactivex.Flowable
 import io.reactivex.Single
 

rocket-chat-core/src/main/java/chat/rocket/core/repositories/LoginServiceConfigurationRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 

rocket-chat-core/src/main/java/chat/rocket/core/repositories/MessageRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 

rocket-chat-core/src/main/java/chat/rocket/core/repositories/PermissionRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Single;
 
 import chat.rocket.core.models.Permission;

rocket-chat-core/src/main/java/chat/rocket/core/repositories/PublicSettingRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Single;
 
 import chat.rocket.core.models.PublicSetting;

rocket-chat-core/src/main/java/chat/rocket/core/repositories/RoomRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 

rocket-chat-core/src/main/java/chat/rocket/core/repositories/RoomRoleRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Single;
 
 import chat.rocket.core.models.Room;

rocket-chat-core/src/main/java/chat/rocket/core/repositories/ServerInfoRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 
 import io.reactivex.Flowable;
 

rocket-chat-core/src/main/java/chat/rocket/core/repositories/SessionRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 import io.reactivex.Single;
 

rocket-chat-core/src/main/java/chat/rocket/core/repositories/UserRepository.java

 package chat.rocket.core.repositories;
 
-import com.fernandocejas.arrow.optional.Optional;
+import com.hadisatrio.optional.Optional;
 import io.reactivex.Flowable;
 
 import java.util.List;

rocket-chat-core/src/test/java/chat/rocket/core/interactors/EditMessageInteractorTest.kt

@@ -7,7 +7,7 @@ import chat.rocket.core.models.PublicSetting
 import chat.rocket.core.models.Room
 import chat.rocket.core.models.User
 import chat.rocket.core.repositories.*
-import com.fernandocejas.arrow.optional.Optional
+import com.hadisatrio.optional.Optional
 import io.reactivex.Flowable
 import io.reactivex.Single
 import io.reactivex.observers.TestObserver

rocket-chat-core/src/test/java/chat/rocket/core/interactors/PermissionInteractorTest.kt

@@ -4,7 +4,7 @@ import chat.rocket.core.models.*
 import chat.rocket.core.repositories.PermissionRepository
 import chat.rocket.core.repositories.RoomRoleRepository
 import chat.rocket.core.repositories.UserRepository
-import com.fernandocejas.arrow.optional.Optional
+import com.hadisatrio.optional.Optional
 import io.reactivex.Flowable
 import io.reactivex.Single
 import io.reactivex.observers.TestObserver