a simple topology printing example

Author: Joshua Reich

pyretic/examples/topology_printer.py

@@ -0,0 +1,31 @@
+################################################################################
+# The Pyretic Project                                                          #
+# frenetic-lang.org/pyretic                                                    #
+# author: Joshua Reich  ([email protected])                              #
+################################################################################
+
+from multiprocessing import Lock
+
+from pyretic.lib.corelib import *
+from pyretic.lib.std import *
+
+class topology_printer(DynamicPolicy):
+
+    def __init__(self):
+        self.topology = None
+        self.lock = Lock()
+        super(topology_printer,self).__init__()
+
+    def set_network(self, network):
+        with self.lock:
+            if self.topology and (self.topology == network.topology):
+                pass
+            else:
+                print self.topology
+                print network.topology
+                self.topology = network.topology
+                print self.topology
+
+
+def main ():
+    return topology_printer()