single server example running

dream/simulation/Examples/SingleServer.py

 from dream.simulation.imports import Machine, Source, Exit, Part, G 
-from dream.simulation.imports import simulate, activate, initialize
+from dream.simulation.imports import simpy
+
+G.env=simpy.Environment()   # define a simpy environment
+                            # this is where all the simulation object 'live'
 
 #define the objects of the model 
 S=Source('S1','Source',interarrivalTime={'distributionType':'Fixed','mean':0.5}, entity='Dream.Part')
@@ -14,7 +17,6 @@ M.defineRouting(predecessorList=[S],successorList=[E])
 E.defineRouting(predecessorList=[M])
 
 def main():
-    initialize()                        #initialize the simulation (SimPy method)
     
     #initialize all the objects    
     for object in G.ObjList:
@@ -22,11 +24,11 @@ def main():
     
     #activate all the objects 
     for object in G.ObjList:
-        activate(object, object.run())
+        G.env.process(object.run())   
   
     G.maxSimTime=1440.0     #set G.maxSimTime 1440.0 minutes (1 day)
         
-    simulate(until=G.maxSimTime)    #run the simulation
+    G.env.run(G.maxSimTime)    #run the simulation
     
     #carry on the post processing operations for every object in the topology       
     for object in G.ObjList: