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diff --git a/src/rocksdb/table/persistent_cache_helper.h b/src/rocksdb/table/persistent_cache_helper.h
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+// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
+// This source code is licensed under both the GPLv2 (found in the
+// COPYING file in the root directory) and Apache 2.0 License
+// (found in the LICENSE.Apache file in the root directory).
+#pragma once
+
+#include <string>
+
+#include "monitoring/statistics.h"
+#include "table/format.h"
+#include "table/persistent_cache_options.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+struct BlockContents;
+
+// PersistentCacheHelper
+//
+// Encapsulates some of the helper logic for read and writing from the cache
+class PersistentCacheHelper {
+ public:
+ // insert block into raw page cache
+ static void InsertRawPage(const PersistentCacheOptions& cache_options,
+ const BlockHandle& handle, const char* data,
+ const size_t size);
+
+ // insert block into uncompressed cache
+ static void InsertUncompressedPage(
+ const PersistentCacheOptions& cache_options, const BlockHandle& handle,
+ const BlockContents& contents);
+
+ // lookup block from raw page cacge
+ static Status LookupRawPage(const PersistentCacheOptions& cache_options,
+ const BlockHandle& handle,
+ std::unique_ptr<char[]>* raw_data,
+ const size_t raw_data_size);
+
+ // lookup block from uncompressed cache
+ static Status LookupUncompressedPage(
+ const PersistentCacheOptions& cache_options, const BlockHandle& handle,
+ BlockContents* contents);
+};
+
+} // namespace ROCKSDB_NAMESPACE