SingleServer Example updated to have a buffer

dream/simulation/Examples/SingleServer.py

-from dream.simulation.imports import Machine, Source, Exit, Part  
+from dream.simulation.imports import Source, Queue, Machine, Exit  
 from dream.simulation.Globals import runSimulation
 
 #define the objects of the model 
 S=Source('S1','Source',interarrivalTime={'distributionType':'Fixed','mean':0.5}, entity='Dream.Part')
+Q=Queue('Q1','Queue', capacity=1)
 M=Machine('M1','Machine', processingTime={'distributionType':'Fixed','mean':0.25})
 E=Exit('E1','Exit')  
 
 #define predecessors and successors for the objects    
-S.defineRouting(successorList=[M])
-M.defineRouting(predecessorList=[S],successorList=[E])
+S.defineRouting(successorList=[Q])
+Q.defineRouting(predecessorList=[S],successorList=[M])
+M.defineRouting(predecessorList=[Q],successorList=[E])
 E.defineRouting(predecessorList=[M])
 
 def main(test=0):
     # add all the objects in a list
-    objectList=[S,M,E]  
+    objectList=[S,Q,M,E]  
     # set the length of the experiment  
     maxSimTime=1440.0
     # call the runSimulation giving the objects and the length of the experiment