From 340ac5c37abcbc70820bb6b7bb0c84aceca3aa3d Mon Sep 17 00:00:00 2001
From: Sourabh Jain <sourabhjain@microsoft.com>
Date: Tue, 28 Mar 2023 03:31:57 +0530
Subject: [PATCH] added more comments

---
 .../src/Telemetry/Sampler/DataSampler.cs                 | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Microsoft.Azure.Cosmos/src/Telemetry/Sampler/DataSampler.cs b/Microsoft.Azure.Cosmos/src/Telemetry/Sampler/DataSampler.cs
index da2da792d9..071e440945 100644
--- a/Microsoft.Azure.Cosmos/src/Telemetry/Sampler/DataSampler.cs
+++ b/Microsoft.Azure.Cosmos/src/Telemetry/Sampler/DataSampler.cs
@@ -26,11 +26,13 @@ public static List<RequestInfo> OrderAndSample(List<RequestInfo> requestInfoList
 
             foreach (RequestInfo requestInfo in requestInfoList)
             {
+                // Get a unique key identifier for an object
                 int key = requestInfo.GetHashCodeForSampler();
 
                 // Check if similar object is already present
                 if (sampledRawData.TryGetValue(key, out List<KeyValuePair<double, RequestInfo>> sortedData))
                 {
+                    // Add the new object to the list
                     DataSampler.AddToList(orderBy, requestInfo, sortedData);
 
                     sortedData.Sort(DataComparer.Instance);
@@ -67,18 +69,21 @@ List<KeyValuePair<double, RequestInfo>> newSortedData
 
         private static void AddToList(DataSamplerOrderBy orderBy, RequestInfo requestInfo, List<KeyValuePair<double, RequestInfo>> sortedData)
         {
+            double valueToStore;
             if (orderBy == DataSamplerOrderBy.Latency)
             {
-                sortedData.Add(new KeyValuePair<double, RequestInfo>(requestInfo.GetP99Latency(), requestInfo));
+                valueToStore = requestInfo.GetP99Latency();
             }
             else if (orderBy == DataSamplerOrderBy.SampleCount)
             {
-                sortedData.Add(new KeyValuePair<double, RequestInfo>(requestInfo.GetSampleCount(), requestInfo));
+                valueToStore = requestInfo.GetSampleCount();
             }
             else
             {
                 throw new Exception("order by not supported. Only Supported values are Latency, SampleCount");
             }
+            
+            sortedData.Add(new KeyValuePair<double, RequestInfo>(valueToStore, requestInfo));
         }
     }