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56 lines
1.8 KiB
56 lines
1.8 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <cinttypes>
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#include "cache/typed_cache.h"
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#include "db/blob/blob_file_reader.h"
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#include "rocksdb/rocksdb_namespace.h"
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#include "util/mutexlock.h"
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namespace ROCKSDB_NAMESPACE {
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class Cache;
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struct ImmutableOptions;
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struct FileOptions;
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class HistogramImpl;
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class Status;
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class Slice;
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class IOTracer;
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class BlobFileCache {
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public:
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BlobFileCache(Cache* cache, const ImmutableOptions* immutable_options,
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const FileOptions* file_options, uint32_t column_family_id,
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HistogramImpl* blob_file_read_hist,
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const std::shared_ptr<IOTracer>& io_tracer);
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BlobFileCache(const BlobFileCache&) = delete;
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BlobFileCache& operator=(const BlobFileCache&) = delete;
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Status GetBlobFileReader(const ReadOptions& read_options,
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uint64_t blob_file_number,
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CacheHandleGuard<BlobFileReader>* blob_file_reader);
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private:
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using CacheInterface =
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BasicTypedCacheInterface<BlobFileReader, CacheEntryRole::kMisc>;
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using TypedHandle = CacheInterface::TypedHandle;
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CacheInterface cache_;
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// Note: mutex_ below is used to guard against multiple threads racing to open
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// the same file.
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Striped<CacheAlignedWrapper<port::Mutex>> mutex_;
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const ImmutableOptions* immutable_options_;
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const FileOptions* file_options_;
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uint32_t column_family_id_;
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HistogramImpl* blob_file_read_hist_;
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std::shared_ptr<IOTracer> io_tracer_;
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static constexpr size_t kNumberOfMutexStripes = 1 << 7;
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};
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} // namespace ROCKSDB_NAMESPACE
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