1 files changed, 44 insertions, 0 deletions
diff --git a/src/rocksdb/table/persistent_cache_helper.h b/src/rocksdb/table/persistent_cache_helper.h
new file mode 100644
index 000000000..1db855729
--- /dev/null
+++ b/src/rocksdb/table/persistent_cache_helper.h
@@ -0,0 +1,44 @@
+//  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