/// <inheritdoc/>
public Selections Solve(Requirements requirements)
{
#region Sanity checks
if (requirements == null)
{
throw new ArgumentNullException("requirements");
}
if (requirements.InterfaceUri == null)
{
throw new ArgumentException(Resources.MissingInterfaceUri, "requirements");
}
#endregion
Log.Info("Running Python Solver for: " + requirements);
// Execute the external solver
ISolverControl control;
if (WindowsUtils.IsWindows)
{
control = new SolverControlBundled(_handler); // Use bundled Python on Windows
}
else
{
control = new SolverControlNative(_handler); // Use native Python everywhere else
}
string arguments = GetSolverArguments(requirements);
string result = null;
_handler.RunTask(new SimpleTask(Resources.ExternalSolverRunning, () => { result = control.ExecuteSolver(arguments); }));
// Flush in-memory cache in case external solver updated something on-disk
_feedManager.Flush();
// Detect when feeds get out-of-date
_feedManager.Stale = result.Contains("<!-- STALE_FEEDS -->");
// Parse StandardOutput data as XML
_handler.CancellationToken.ThrowIfCancellationRequested();
try
{
var selections = XmlStorage.FromXmlString <Selections>(result);
selections.Normalize();
return(selections);
}
#region Error handling
catch (InvalidDataException ex)
{
Log.Warn("Solver result:" + Environment.NewLine + result);
throw new SolverException(Resources.ExternalSolverOutputErrror, ex);
}
#endregion
}
