From 93a38bc6fb3ed7b7218bfebb6ba51d23d1f76ffe Mon Sep 17 00:00:00 2001
From: Joel Thomas <joel.thomas@trenser.com>
Date: Thu, 11 Jun 2026 14:09:07 +0530
Subject: [PATCH] changes

---
 .../datastores/sharedmemory/SharedMemory.cpp  | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.cpp b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.cpp
index 5f59fc4..e48107e 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.cpp
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/sharedmemory/SharedMemory.cpp
@@ -327,4 +327,66 @@ bool SharedMemory::ensureCapacityForInsert(MappingInfo& mapping)
         return true;
     }
     return resizeMapping(mapping, capacity * 2);
+}
+
+/*
+Function: ensureLatestMapping
+Description: Remaps the file if another process has resized it.
+Parameters:
+    - mapping: MappingInfo&, mapping information and handles
+Returns:
+    - bool: True if the mapping is valid and up to date, otherwise false
+*/
+bool SharedMemory::ensureLatestMapping(MappingInfo& mapping)
+{
+    FileHeader* header = getHeader(mapping);
+    if (header == nullptr)
+    {
+        return false;
+    }
+    if (header->capacity == mapping.mappedCapacity)
+    {
+        return true;
+    }
+    if (!UnmapViewOfFile(mapping.mappedView))
+    {
+        invalidateMapping(mapping);
+        return false;
+    }
+    mapping.mappedView = nullptr;
+    CloseHandle(mapping.mappingHandle);
+    mapping.mappingHandle = NULL;
+    mapping.mappingHandle =
+        CreateFileMappingA(
+            mapping.fileHandle,
+            NULL,
+            PAGE_READWRITE,
+            0,
+            0,
+            NULL);
+    if (mapping.mappingHandle == NULL)
+    {
+        invalidateMapping(mapping);
+        return false;
+    }
+    mapping.mappedView =
+        MapViewOfFile(
+            mapping.mappingHandle,
+            FILE_MAP_ALL_ACCESS,
+            0,
+            0,
+            0);
+    if (mapping.mappedView == nullptr)
+    {
+        invalidateMapping(mapping);
+        return false;
+    }
+    header = getHeader(mapping);
+    if (header == nullptr)
+    {
+        invalidateMapping(mapping);
+        return false;
+    }
+    mapping.mappedCapacity = header->capacity;
+    return true;
 }
\ No newline at end of file