SessionManager.java

public void authenticateWithId(final LiveData<AuthResource<User>> source) {
    if(cachedUser != null){
        cachedUser.setValue(AuthResource.loading((User)null));
        cachedUser.addSource(source, new Observer<AuthResource<User>>() {
            @Override
            public void onChanged(AuthResource<User> userAuthResource) {
                cachedUser.setValue(userAuthResource);
                cachedUser.removeSource(source);

                if(userAuthResource.status.equals(AuthResource.AuthStatus.ERROR)){
                    cachedUser.setValue(AuthResource.<User>logout());
                }
            }
        });
    }
}