Refactor some shared code to SubchannelList

1 files changed, 13 insertions, 0 deletions

diff --git a/src/core/ext/filters/client_channel/lb_policy/subchannel_list.h b/src/core/ext/filters/client_channel/lb_policy/subchannel_list.h
index 7e2046bcdc..018ac3bb86 100644
--- a/src/core/ext/filters/client_channel/lb_policy/subchannel_list.h
+++ b/src/core/ext/filters/client_channel/lb_policy/subchannel_list.h
@@ -189,6 +189,19 @@ class SubchannelList
   // Returns true if the subchannel list is shutting down.
   bool shutting_down() const { return shutting_down_; }
 
+  // Populates refs_list with the uuids of this SubchannelLists's subchannels.
+  void PopulateChildRefsList(ChildRefsList* refs_list) {
+    for (size_t i = 0; i < subchannels_.size(); ++i) {
+      if (subchannels_[i].subchannel() != nullptr) {
+        grpc_core::channelz::SubchannelNode* subchannel_node =
+            grpc_subchannel_get_channelz_node(subchannels_[i].subchannel());
+        if (subchannel_node != nullptr) {
+          refs_list->push_back(subchannel_node->subchannel_uuid());
+        }
+      }
+    }
+  }
+
   // Accessors.
   LoadBalancingPolicy* policy() const { return policy_; }
   TraceFlag* tracer() const { return tracer_; }