Makes the Random Engine of AthRNGSvc configurable via SimFlags and adds a...

Makes the Random Engine of AthRNGSvc configurable via SimFlags and adds a prinout of the used engine.

Control/RngComps/python/RngCompsConfig.py

+# Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
+
+from AthenaCommon import CfgMgr
+
+def getAthRNGSvc(name='AthRNGSvc', **kwargs):
+    return CfgMgr.AthRNGSvc(name, **kwargs)
+
+def getAthMixMaxRNGSvc(name='AthMixMaxRNGSvc', **kwargs):
+    kwargs.setdefault('EngineType', 'MixMax')
+    return CfgMgr.AthRNGSvc(name, **kwargs)

Control/RngComps/python/RngCompsConfigDb.py

+# Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
+
+from AthenaCommon.CfgGetter import addService
+addService("RngComps.RngCompsConfig.getAthRNGSvc", "AthRNGSvc")
+addService("RngComps.RngCompsConfig.getAthMixMaxRNGSvc", "AthMixMaxRNGSvc")

Control/RngComps/src/AthRNGSvc.cxx

@@ -42,6 +42,8 @@ StatusCode AthRNGSvc::initialize()
     ATH_MSG_FATAL("Generator type \"" << m_rngType << "\" is not known. Check Joboptions");
     return StatusCode::FAILURE;
   }
+  
+  ATH_MSG_INFO("Selected random engine: \"" << m_rngType << "\"");
 
   return StatusCode::SUCCESS;
 }