rob05c commented on a change in pull request #7023:
URL: https://github.com/apache/trafficserver/pull/7023#discussion_r508004669



##########
File path: include/tscpp/api/parentresult.h
##########
@@ -0,0 +1,44 @@
+/** @file
+
+  @section license License
+
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+ */
+
+#pragma once
+
+#include "ts/apidefs.h"
+#include "tscore/ConsistentHash.h"
+
+extern const char *ParentResultStr[];
+
+struct TSParentResult {
+  const char *hostname;
+  int port;
+  bool retry;
+  TSParentResultType result;
+  bool chash_init[TS_MAX_GROUP_RINGS] = {false};
+  TSHostStatus first_choice_status    = TSHostStatus::TS_HOST_STATUS_INIT;
+  int line_number;
+  uint32_t last_parent;
+  uint32_t start_parent;
+  uint32_t last_group;
+  bool wrap_around;
+  bool mapWrapped[2];
+  int last_lookup;
+  ATSConsistentHashIter chashIter[TS_MAX_GROUP_RINGS];

Review comment:
       Yeah, it's a state object. Used by both ParentSelection and Strategies 
in core (or rather, copied to an identical structure in core).
   
   I.e.
   
https://github.com/apache/trafficserver/blob/786463/proxy/ParentConsistentHash.cc#L110
   
https://github.com/apache/trafficserver/blob/786463/proxy/http/remap/NextHopConsistentHash.cc#L335
   




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