title: FCMMessagingService in clean architecture?
body: <p>I am developing an app where I am using Firebase Cloud Messaging. And I am using clean architecture for my app. I want to know where(in which layer:data, domain, presentation) is the best solution to put my classes which are called MyFirebaseMessagingService and MyFirebaseInstanceServiceID?
  These are my classes:
  myFirebaseMessagingService:</p>
  
  <pre><code>public class myFirebaseMessagingService extends FirebaseMessagingService {
  
  private static final String TAG="MyFirebaseMsgService";
  @Override
  public void onMessageReceived(RemoteMessage remoteMessage) {
      super.onMessageReceived(remoteMessage);
      Log.d("onMessageReceived", "Pozvana funkcija onMessageReceived");
      Log.d(TAG, "From " + remoteMessage.getFrom());
      Log.d(TAG, "Body " + remoteMessage.getNotification().getBody());
      Log.d(TAG, "Location " + remoteMessage.getNotification().getClickAction());
      Log.d(TAG, "Value " + remoteMessage.getData().get("click_action"));
      sendNotification(remoteMessage);
      Log.d("Function called", "sendNotification");
  
  
  }
  
  private void sendNotification(RemoteMessage remoteMessage) {
      Intent intent = new Intent(myFirebaseMessagingService.this, MainActivity.class);
      intent.putExtra("click_action", "goToFragment1");
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
  
  
      PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
      Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
      NotificationCompat.Builder notification=new NotificationCompat.Builder(this)
              .setSmallIcon(logo)
              .setContentText(remoteMessage.getNotification().getBody())
              .setContentTitle("Title")
              .setAutoCancel(true)
              .setSound(defaultSoundUri)
              .setContentIntent(pendingIntent);
      NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
      notificationManager.notify(0, notification.build());
      String message=remoteMessage.getNotification().getBody();
      DataBaseHelper db=new DataBaseHelper(this);
      db.insertMsg(message);
      intent.putExtra("poruka",message );
      Log.d("Log&gt;Poruka", message);
  
  
  }
  </code></pre>
  
  <p>And this is myFirebaseInstanceServiceID:</p>
  
  <pre><code>public class myFirebaseInstanceServiceID extends FirebaseInstanceIdService {
  private static final String TAG = "MyFirebaseIIDService";
  
  @Override
  public void onTokenRefresh() {
      super.onTokenRefresh();
      String refreshedToken = FirebaseInstanceId.getInstance().getToken();
      Log.d(TAG, "Refreshed token: " + refreshedToken);
  
      // TODO: Implement this method to send any registration to your app's servers.
      sendRegistrationToServer(refreshedToken);
  }
  private void sendRegistrationToServer(String token) {
      // Add custom implementation, as needed.
  }
  </code></pre>