Method OnSessionExpired

Modules/PythonSegmentationUI/src/QmitknnInteractiveToolGUI.cpp:1196–1237

}

void QmitknnInteractiveToolGUI::OnSessionExpired()
{
  // The tool emits SessionExpiredEvent from two places (the heartbeat and a
  // mid-interaction failure). Handle only the first one: otherwise a second
  // event arriving before the deferred teardown below runs would stack a second
  // identical dialog. The flag is cleared in OnSessionEnded, so a later genuine
  // expiry of a new session still fires.
  if (m_SessionExpiredHandled)
    return;

  m_SessionExpiredHandled = true;

  // Stop beating immediately so a second timeout cannot queue another
  // teardown/dialog before the deferred AbortSession below runs. (OnSessionEnded
  // also stops the timer once the session is actually torn down.)
  m_HeartbeatTimer->stop();

  // A remote session was lost. Tear it down on the next event-loop tick rather
  // than now: when this fires from within an interactor's event handling (a
  // connection loss detected mid-interaction), disabling/resetting interactors
  // inline is unsafe; deferring is also harmless when it fires from the
  // heartbeat timer (a proactive expiry). AbortSession() ends the session,
  // clears all prompts and the preview, and -- via SessionEndedEvent ->
  // OnSessionEnded -- reverts the widget to its pre-init state, so the user just
  // clicks Initialize to reconnect.
  QTimer::singleShot(0, this, [this]() {
    if (QCoreApplication::closingDown())
      return;

    if (auto* tool = this->GetTool())
      tool->AbortSession();

    const auto message = QString(
      "<h3 %1>Remote session ended</h3>"
      "<p %1>The connection to the nnInteractive server was lost or the session "
      "expired (idle timeout, server restart, or the server is at capacity).</p>"
      "<p %1>Your interactions were cleared. Click <em>Initialize</em> to start a "
      "new session.</p>").arg(LINE_HEIGHT_STYLE);

    QMessageBox::warning(nullptr, "nnInteractive", message);
  });
}

void QmitknnInteractiveToolGUI::ApplyCapabilityGating()
{