From d56cfa40dd81e3b15c4d6cb8dfa7aa7ff56e8656 Mon Sep 17 00:00:00 2001
From: Guthrie Adams <guthadam@amazon.com>
Date: Thu, 2 Dec 2021 16:29:55 -0600
Subject: [PATCH] Changing trace logger to clear log file when opened

Also switched the log message sink from a vector to a list so the entire container does not have to be rebuilt every time and entry is added.

Signed-off-by: Guthrie Adams <guthadam@amazon.com>
---
 .../AzToolsFramework/AzToolsFramework/Logger/TraceLogger.cpp  | 4 ++--
 .../AzToolsFramework/AzToolsFramework/Logger/TraceLogger.h    | 3 ++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Code/Framework/AzToolsFramework/AzToolsFramework/Logger/TraceLogger.cpp b/Code/Framework/AzToolsFramework/AzToolsFramework/Logger/TraceLogger.cpp
index ce73826388..386f5ea179 100644
--- a/Code/Framework/AzToolsFramework/AzToolsFramework/Logger/TraceLogger.cpp
+++ b/Code/Framework/AzToolsFramework/AzToolsFramework/Logger/TraceLogger.cpp
@@ -73,7 +73,7 @@ namespace AzToolsFramework
         AZStd::string logPath;
         StringFunc::Path::Join(logDirectory.c_str(), logFileName.c_str(), logPath);
 
-        m_logFile.reset(aznew LogFile(logPath.c_str()));
+        m_logFile.reset(aznew LogFile(logPath.c_str(), true));
         if (m_logFile)
         {
             m_logFile->SetMachineReadable(false);
@@ -81,7 +81,7 @@ namespace AzToolsFramework
             {
                 m_logFile->AppendLog(LogFile::SEV_NORMAL, message.window.c_str(), message.message.c_str());
             }
-            m_startupLogSink = {};
+            m_startupLogSink.clear();
             m_logFile->FlushLog();
         }
     }
diff --git a/Code/Framework/AzToolsFramework/AzToolsFramework/Logger/TraceLogger.h b/Code/Framework/AzToolsFramework/AzToolsFramework/Logger/TraceLogger.h
index 10708e3239..dafd3becc8 100644
--- a/Code/Framework/AzToolsFramework/AzToolsFramework/Logger/TraceLogger.h
+++ b/Code/Framework/AzToolsFramework/AzToolsFramework/Logger/TraceLogger.h
@@ -55,7 +55,8 @@ namespace AzToolsFramework
             AZStd::string window;
             AZStd::string message;
         };
-        AZStd::vector<LogMessage> m_startupLogSink;
+
+        AZStd::list<LogMessage> m_startupLogSink;
         AZStd::unordered_set<AZStd::string> m_windowFilters;
         AZStd::unordered_set<AZStd::string> m_messageFilters;
         AZStd::unique_ptr<AzFramework::LogFile> m_logFile;