commit dee1aff0e0853b8097e8ad1accc1237838d20ad6
author Lei Xu <x.rayyle@gmail.com> Fri Oct 16 00:45:10 2015 -0500
committer Gerrit Code Review <gerrit@onlab.us> Mon Oct 19 18:52:04 2015 +0000
tree 72e133040dedbe1e322fd8204d274f3c73a35ea9
parent 1e60f97ae50c05b94fcb6a10520738bfb5efdfd1

[emu][onos-3159] fix concurrency flaws in OpenFlowDeviceProvider.java and OpenFlowGroupProvider.java

Change-Id: I76b21b221d3ef71e1701c13810c4df374afe1776

providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java

diff --git a/providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java b/providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java
index 78650fe..8acf08e 100644
--- a/providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java
+++ b/providers/openflow/group/src/main/java/org/onosproject/provider/of/group/impl/OpenFlowGroupProvider.java
@@ -334,12 +334,20 @@
         @Override
         public void switchAdded(Dpid dpid) {
             OpenFlowSwitch sw = controller.getSwitch(dpid);
+            if (sw == null) {
+                return;
+            }
             if (isGroupSupported(sw)) {
                 GroupStatsCollector gsc = new GroupStatsCollector(
                         controller.getSwitch(dpid), POLL_INTERVAL);
                 gsc.start();
                 collectors.put(dpid, gsc);
             }
+
+            //figure out race condition
+            if (controller.getSwitch(dpid) == null) {
+                switchRemoved(dpid);
+            }
         }
 
         @Override