Controllable observable with commit()

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private final PublishSubject<Object> dialogDisplaySubject = PublishSubject.create();
    private final Disposable disposable = dialogDisplaySubject
            .subscribe(o ->
                    new MyDialogFragment()
                            .show(getSupportFragmentManager(), "DIALOG_TAG")
            );

    @Override
    protected void onPause() {
        super.onPause();
        dialogDisplaySubject.onNext(new Object()); // safe to call
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        dialogDisplaySubject.onNext(new Object()); // safe to call
        super.onSaveInstanceState(outState);
        dialogDisplaySubject.onNext(new Object()); // not safe to call, IllegalStateException
    }

    @Override
    protected void onStop() {
        dialogDisplaySubject.onNext(new Object()); // not safe to call, IllegalStateException
        super.onStop();
    }

}