Method StartSession

Modules/PythonSegmentation/src/mitknnInteractiveTool.cpp:802–844

}

void mitk::nnInteractiveTool::StartSession()
{
  if (this->IsSessionRunning())
    this->EndSession();

  auto prefs = GetPreferences();

  // Materialize the session-defining preferences with their effective values so a
  // later no-op preferences "OK" does not register as a value change and tear the
  // session down (mitk::Preferences fires its change event only on an actual
  // change, and a default written into a never-stored key counts as one). Safe
  // here: no session is running yet, so the GUI's stale-session observer is a
  // no-op for these writes.
  for (const auto& [key, defaultValue] : GetSessionDefiningPreferences())
    prefs->Put(key, prefs->Get(key, defaultValue));

  m_Impl->Remote = prefs->Get("nnInteractive/inferenceMode", "local") == "remote";

  // The context is created lightweight (see CreatePythonContext) so the
  // pre-session checks map no venv native libraries. A session does need the
  // bindings (NumPy for mask exchange, the MITK module), so import them now.
  // Activate() is idempotent, so re-running it here only adds the bindings.
  if (auto* pythonContext = m_Impl->GetPythonContext())
    pythonContext->Activate();

  try
  {
    if (m_Impl->Remote)
      this->ConstructRemoteSession();
    else
      this->ConstructLocalSession();
  }
  catch (...)
  {
    // If construction failed before a session was established, do not leave the
    // remote flag set: IsRemoteSession() must report false when nothing runs,
    // and EndSession() (the usual reset path) is a no-op without a session.
    if (!this->IsSessionRunning())
      m_Impl->Remote = false;

    throw;
  }
}

void mitk::nnInteractiveTool::ConstructRemoteSession()
{