RegexSD: change ddsim interface to use a dictionary instead of a list

Too much hassle to ensure that the list was not duplicating the entries in the list

The original implementation also caused infinite loop by appending to the list that was iterated over causing ddsim to use up all the memory and not do anything

Added a test with an example ddsim steering file

DDG4/python/DDSim/Helper/Geometry.py

@@ -36,45 +36,29 @@ def __init__(self):
     self._dumpDGDML_EXTRA = {"help": "If not empty, filename to dump the Geometry as GDML"}
     self.dumpGDML = ""
 
-    self._regexSDDetectorList = []
+    self._regexSDDict = {}
 
     self._closeProperties()
 
   @property
   def regexSensitiveDetector(self):
-    """Configure a sensitive detector for a given detector matched by regular expression (regex).
-
-    'Detector' and 'Match' are mandatory elements of the dictionary, other Keys are assigned as property to the object.
-
-    >>> SIM.geometry.regexSensitiveDetector = {'Detector': 'DRcalo',
-                                               'Match': ['(core|clad)'],
-                                               'OutputLevel': 3,
-                                              }
-
-    This can be assigned repeatedly to add multiple RegexSDs
+    """ The map key is the name of the Detector, and 'Match' is a mandatory elements of the dictionary, other Keys are
+        assigned as property to the object. OutputLevel _sets_ the outputlevel of the plugin, so lower numbers mean more
+        output from the plugin.
+
+        >>> SIM.geometry.regexSensitiveDetector['DRcalo'] = {
+                                                   'Match': ['(core|clad)'],
+                                                   'OutputLevel': 3,
+                                                  }
     """
-    return self._regexSDDetectorList
+    return self._regexSDDict
 
   @regexSensitiveDetector.setter
   def regexSensitiveDetector(self, val):
-    if not val:
-      return
     if isinstance(val, dict):
-      self.__checkRegexKeys(val)
-      self._regexSDDetectorList.append(val)
-    elif isinstance(val, list):
-      for value in val:
-        self.__checkRegexKeys(value)
-        self._regexSDDetectorList.append(value)
-    else:
-        raise RuntimeError(f"Unsupported type for regexSensitiveDetector: {val!r}")
-
-  @staticmethod
-  def __checkRegexKeys(val):
-    """Check the regex SD arguments for required keys."""
-    requiredKeys = ('Detector', 'Match')
-    if not all(key in val for key in requiredKeys):
-      raise RuntimeError(f"RegexSD configuration {val} is missing mandatory key(s): {', '.join(requiredKeys)}")
+      self._regexSDDict = val
+      return
+    raise RuntimeError(f"Unsupported type for regexSensitiveDetector: {val!r}")
 
   def constructGeometry(self, kernel, geant4, geoPrintLevel=2, numberOfThreads=1):
     """Construct Geant4 geometry."""
@@ -100,8 +84,9 @@ def constructGeometry(self, kernel, geant4, geoPrintLevel=2, numberOfThreads=1):
     sensitives.enableUI()
     seq.adopt(sensitives)
 
-    for index, regexDetectors in enumerate(self._regexSDDetectorList):
-      seq, act = geant4.addDetectorConstruction(f'Geant4RegexSensitivesConstruction/ConstrSDRegEx_{index}')
+    for index, (detName, regexDetectors) in enumerate(sorted(self._regexSDDict.items())):
+      seq, act = geant4.addDetectorConstruction(f'Geant4RegexSensitivesConstruction/ConstrSDRegEx_{index} for {detName}')
       # this will set Match and Detector, and other properties if possible
+      setattr(act, "Detector", detName)
       for key, value in regexDetectors.items():
         setattr(act, key, value)

examples/ClientTests/CMakeLists.txt

@@ -632,4 +632,18 @@ if (DD4HEP_USE_GEANT4)
       REGEX_PASS "ResourcesAfterConstruction       ConstructSD:   VmRSS"
       REGEX_FAIL "Error;ERROR; Exception"
   )
+
+  dd4hep_add_test_reg(ClientTests_ddsim_setup_BoxOfStraws
+      COMMAND    "${CMAKE_INSTALL_PREFIX}/bin/run_test_ClientTests.sh"
+      EXEC_ARGS  ddsim
+                 --steeringFile ${ClientTestsEx_INSTALL}/scripts/BoxOfStraws_DDSim.py
+                 --compactFile ${ClientTestsEx_INSTALL}/compact/BoxOfStraws.xml
+                 --enableGun
+                 --numberOfEvents 1
+                 --outputFile regex.slcio
+
+      REGEX_PASS "BoxOfStrawsDet Handled 1 nodes with 1 sensitive volume type"
+      REGEX_FAIL "Error;ERROR; Exception"
+  )
+
 endif(DD4HEP_USE_GEANT4)

examples/ClientTests/scripts/BoxOfStraws_DDSim.py

@@ -0,0 +1,16 @@
+from DDSim.DD4hepSimulation import DD4hepSimulation
+from g4units import mm, GeV, MeV
+SIM = DD4hepSimulation()
+
+# make ddsim find the sensitive detector for box of straws
+SIM.action.calorimeterSDTypes = ['sensitive']
+
+# Configure the regexSD for the BoxOfStraws gas_
+SIM.geometry.regexSensitiveDetector['BoxOfStrawsDet'] = {
+                                       'Match': ['gas_'],
+                                       'OutputLevel': 4,
+                                       }
+
+
+# Disable userParticleHander for box if straws
+SIM.part.userParticleHandler = ""