blob: 9b7c5b96963c493ee222e7f7292047bd1e94f1c3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
// Copyright (c) Meta Platforms, Inc. and affiliates.
// 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 <memory>
#include "memory/memory_allocator.h"
#include "rocksdb/cache.h"
#include "rocksdb/rocksdb_namespace.h"
#include "rocksdb/slice.h"
#include "rocksdb/status.h"
namespace ROCKSDB_NAMESPACE {
// A class representing a single uncompressed value read from a blob file.
class BlobContents {
public:
static std::unique_ptr<BlobContents> Create(CacheAllocationPtr&& allocation,
size_t size);
BlobContents(const BlobContents&) = delete;
BlobContents& operator=(const BlobContents&) = delete;
BlobContents(BlobContents&&) = default;
BlobContents& operator=(BlobContents&&) = default;
~BlobContents() = default;
const Slice& data() const { return data_; }
size_t size() const { return data_.size(); }
size_t ApproximateMemoryUsage() const;
// Callbacks for secondary cache
static size_t SizeCallback(void* obj);
static Status SaveToCallback(void* from_obj, size_t from_offset,
size_t length, void* out);
static Cache::CacheItemHelper* GetCacheItemHelper();
static Status CreateCallback(CacheAllocationPtr&& allocation, const void* buf,
size_t size, void** out_obj, size_t* charge);
private:
BlobContents(CacheAllocationPtr&& allocation, size_t size)
: allocation_(std::move(allocation)), data_(allocation_.get(), size) {}
CacheAllocationPtr allocation_;
Slice data_;
};
} // namespace ROCKSDB_NAMESPACE
|
