1 files changed, 39 insertions, 0 deletions
diff --git a/src/zenserver/projectstore/oplogreferencedset.h b/src/zenserver/projectstore/oplogreferencedset.h
new file mode 100644
index 000000000..297fd29d5
--- /dev/null
+++ b/src/zenserver/projectstore/oplogreferencedset.h
@@ -0,0 +1,39 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include <zencore/uid.h>
+
+#include <optional>
+#include <string_view>
+#include <unordered_set>
+
+namespace zen {
+
+class IoBuffer;
+
+/**
+ * @brief  Records which keys in the oplog (entry["op"]["key"]) are in the ReferencedSet reported by the client that uploaded the oplog.
+ *
+ * An oplog can contain ops from an earlier incremental cook result that are no longer referenced in the most recent cook;
+ * the OplogReferencedSet allows clients that need to view only referenced-by-head-cook entries to trim the oplog down to
+ * those entries.
+ *
+ * Keys are case-sensitive; client must ensure that capitalization matches between the ReferencedSet and the oplog keys.
+ */
+class OplogReferencedSet
+{
+public:
+	void Emplace(Oid OplogId);
+	bool Contains(Oid OplogId, std::string_view OplogKey);
+	void Clear();
+
+	static std::optional<OplogReferencedSet> LoadFromChunk(const IoBuffer& ChunkData);
+
+	static constexpr std::string_view ReferencedSetOplogKey = "ReferencedSet";
+
+private:
+	std::unordered_set<Oid> Set;
+};
+
+}  // namespace zen