mirror of https://github.com/facebook/rocksdb.git
112 lines
3.5 KiB
C++
112 lines
3.5 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 "table/persistent_cache_helper.h"
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#include "table/block_based/block_based_table_reader.h"
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#include "table/format.h"
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namespace ROCKSDB_NAMESPACE {
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const PersistentCacheOptions PersistentCacheOptions::kEmpty;
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void PersistentCacheHelper::InsertSerialized(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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const char* data, const size_t size) {
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assert(cache_options.persistent_cache);
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assert(cache_options.persistent_cache->IsCompressed());
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CacheKey key =
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BlockBasedTable::GetCacheKey(cache_options.base_cache_key, handle);
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cache_options.persistent_cache->Insert(key.AsSlice(), data, size)
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.PermitUncheckedError();
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}
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void PersistentCacheHelper::InsertUncompressed(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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const BlockContents& contents) {
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assert(cache_options.persistent_cache);
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assert(!cache_options.persistent_cache->IsCompressed());
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// Precondition:
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// (1) content is cacheable
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// (2) content is not compressed
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CacheKey key =
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BlockBasedTable::GetCacheKey(cache_options.base_cache_key, handle);
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cache_options.persistent_cache
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->Insert(key.AsSlice(), contents.data.data(), contents.data.size())
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.PermitUncheckedError();
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;
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}
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Status PersistentCacheHelper::LookupSerialized(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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std::unique_ptr<char[]>* out_data, const size_t expected_data_size) {
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#ifdef NDEBUG
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(void)expected_data_size;
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#endif
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assert(cache_options.persistent_cache);
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assert(cache_options.persistent_cache->IsCompressed());
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CacheKey key =
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BlockBasedTable::GetCacheKey(cache_options.base_cache_key, handle);
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size_t size;
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Status s =
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cache_options.persistent_cache->Lookup(key.AsSlice(), out_data, &size);
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if (!s.ok()) {
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// cache miss
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RecordTick(cache_options.statistics, PERSISTENT_CACHE_MISS);
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return s;
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}
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// cache hit
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// Block-based table is assumed
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assert(expected_data_size ==
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handle.size() + BlockBasedTable::kBlockTrailerSize);
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assert(size == expected_data_size);
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RecordTick(cache_options.statistics, PERSISTENT_CACHE_HIT);
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return Status::OK();
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}
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Status PersistentCacheHelper::LookupUncompressed(
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const PersistentCacheOptions& cache_options, const BlockHandle& handle,
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BlockContents* contents) {
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assert(cache_options.persistent_cache);
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assert(!cache_options.persistent_cache->IsCompressed());
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if (!contents) {
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// We shouldn't lookup in the cache. Either
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// (1) Nowhere to store
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return Status::NotFound();
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}
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CacheKey key =
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BlockBasedTable::GetCacheKey(cache_options.base_cache_key, handle);
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std::unique_ptr<char[]> data;
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size_t size;
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Status s =
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cache_options.persistent_cache->Lookup(key.AsSlice(), &data, &size);
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if (!s.ok()) {
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// cache miss
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RecordTick(cache_options.statistics, PERSISTENT_CACHE_MISS);
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return s;
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}
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// please note we are potentially comparing compressed data size with
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// uncompressed data size
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assert(handle.size() <= size);
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// update stats
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RecordTick(cache_options.statistics, PERSISTENT_CACHE_HIT);
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// construct result and return
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*contents = BlockContents(std::move(data), size);
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return Status::OK();
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}
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} // namespace ROCKSDB_NAMESPACE
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