mirror of https://github.com/facebook/rocksdb.git
42 lines
1.4 KiB
C++
42 lines
1.4 KiB
C++
// 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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#include "rocksdb/secondary_cache.h"
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#include "cache/cache_entry_roles.h"
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namespace ROCKSDB_NAMESPACE {
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namespace {
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void NoopDelete(Cache::ObjectPtr, MemoryAllocator*) {}
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size_t SliceSize(Cache::ObjectPtr obj) {
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return static_cast<Slice*>(obj)->size();
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}
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Status SliceSaveTo(Cache::ObjectPtr from_obj, size_t from_offset, size_t length,
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char* out) {
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const Slice& slice = *static_cast<Slice*>(from_obj);
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std::memcpy(out, slice.data() + from_offset, length);
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return Status::OK();
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}
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Status FailCreate(const Slice&, Cache::CreateContext*, MemoryAllocator*,
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Cache::ObjectPtr*, size_t*) {
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return Status::NotSupported("Only for dumping data into SecondaryCache");
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}
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} // namespace
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Status SecondaryCache::InsertSaved(const Slice& key, const Slice& saved) {
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static Cache::CacheItemHelper helper{CacheEntryRole::kMisc, &NoopDelete,
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&SliceSize, &SliceSaveTo, &FailCreate};
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// NOTE: depends on Insert() being synchronous, not keeping pointer `&saved`
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return Insert(key, const_cast<Slice*>(&saved), &helper);
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}
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} // namespace ROCKSDB_NAMESPACE
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