Switch poor man list queue to optimized collections.deque

master/bt5/vifib_base/WorkflowTemplateItem/portal_workflow/software_instance_slap_interface_workflow/scripts/SoftwareInstance_bangSoftwareInstanceTree.xml

@@ -50,7 +50,9 @@
         </item>
         <item>
             <key> <string>_body</string> </key>
-            <value> <string>software_instance = state_change[\'object\']\n
+            <value> <string>import collections\n
+\n
+software_instance = state_change[\'object\']\n
 portal = software_instance.getPortalObject()\n
 \n
 root_hosting_subscription = portal.portal_catalog.getResultValue(uid=software_instance.SoftwareInstance_getRootHostingSubscriptionUid())\n
@@ -59,12 +61,9 @@ root_software_instance = root_hosting_subscription.HostingSubscription_requestRo
 \n
 # Use iterative algorithm instead of recursive approach in order to avoid\n
 # complexity as much as possible.\n
-flat_tree = [root_software_instance]\n
-while True:\n
-  try:\n
-    software_instance = flat_tree.pop(0)\n
-  except:\n
-    break\n
+flat_tree = collections.deque([root_software_instance])\n
+while flat_tree:\n
+  software_instance = flat_tree.popleft()\n
   flat_tree.extend(software_instance.getPredecessorValueList())\n
   try:\n
     software_instance.Item_getInstancePackingListLine(service_relative_url=portal.portal_preferences.getPreferredInstanceCleanupResource())\n

master/bt5/vifib_base/WorkflowTemplateItem/portal_workflow/software_instance_slap_interface_workflow/scripts/SoftwareInstance_requestSoftwareInstance.xml

@@ -52,6 +52,8 @@
             <key> <string>_body</string> </key>
             <value> <string encoding="cdata"><![CDATA[
 
+import collections\n
+\n
 software_instance = state_change[\'object\']\n
 portal = software_instance.getPortalObject()\n
 # Get required arguments\n
@@ -76,12 +78,9 @@ root_hosting_subscription = software_instance.portal_catalog.getResultValue(\n
   uid=software_instance.SoftwareInstance_getRootHostingSubscriptionUid(),\n
 )\n
 \n
-predecessor_list = root_hosting_subscription.getPredecessorValueList()\n
-while True:\n
-  try:\n
-    software_instance = predecessor_list.pop(0)\n
-  except IndexError:\n
-    break\n
+predecessor_list = collections.deque(root_hosting_subscription.getPredecessorValueList())\n
+while predecessor_list:\n
+  software_instance = predecessor_list.popleft()\n
   software_instance_predecessor_list = software_instance.getPredecessorValueList() or []\n
   graph[software_instance.getUid()] = [predecessor.getUid()\n
                                        for predecessor in software_instance_predecessor_list]\n

master/bt5/vifib_base/bt/revision

-333
\ No newline at end of file
+334
\ No newline at end of file