mirror of https://github.com/facebook/rocksdb.git
100 lines
2.8 KiB
C++
100 lines
2.8 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 "db/blob/blob_file_cache.h"
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#include <cassert>
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#include <memory>
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#include "db/blob/blob_file_reader.h"
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#include "options/cf_options.h"
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#include "rocksdb/cache.h"
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#include "rocksdb/slice.h"
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#include "test_util/sync_point.h"
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#include "util/hash.h"
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namespace ROCKSDB_NAMESPACE {
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BlobFileCache::BlobFileCache(Cache* cache,
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const ImmutableCFOptions* immutable_cf_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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: cache_(cache),
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mutex_(kNumberOfMutexStripes, GetSliceNPHash64),
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immutable_cf_options_(immutable_cf_options),
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file_options_(file_options),
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column_family_id_(column_family_id),
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blob_file_read_hist_(blob_file_read_hist) {
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assert(cache_);
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assert(immutable_cf_options_);
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assert(file_options_);
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}
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Status BlobFileCache::GetBlobFileReader(
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uint64_t blob_file_number,
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CacheHandleGuard<BlobFileReader>* blob_file_reader) {
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assert(blob_file_reader);
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assert(blob_file_reader->IsEmpty());
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const Slice key = GetSlice(&blob_file_number);
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assert(cache_);
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Cache::Handle* handle = cache_->Lookup(key);
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if (handle) {
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*blob_file_reader = CacheHandleGuard<BlobFileReader>(cache_, handle);
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return Status::OK();
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}
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TEST_SYNC_POINT("BlobFileCache::GetBlobFileReader:DoubleCheck");
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// Check again while holding mutex
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MutexLock lock(mutex_.get(key));
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handle = cache_->Lookup(key);
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if (handle) {
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*blob_file_reader = CacheHandleGuard<BlobFileReader>(cache_, handle);
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return Status::OK();
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}
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assert(immutable_cf_options_);
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Statistics* const statistics = immutable_cf_options_->statistics;
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RecordTick(statistics, NO_FILE_OPENS);
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std::unique_ptr<BlobFileReader> reader;
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{
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assert(file_options_);
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const Status s = BlobFileReader::Create(
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*immutable_cf_options_, *file_options_, column_family_id_,
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blob_file_read_hist_, blob_file_number, &reader);
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if (!s.ok()) {
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RecordTick(statistics, NO_FILE_ERRORS);
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return s;
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}
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}
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{
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constexpr size_t charge = 1;
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const Status s = cache_->Insert(key, reader.get(), charge,
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&DeleteCacheEntry<BlobFileReader>, &handle);
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if (!s.ok()) {
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RecordTick(statistics, NO_FILE_ERRORS);
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return s;
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}
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}
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reader.release();
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*blob_file_reader = CacheHandleGuard<BlobFileReader>(cache_, handle);
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return Status::OK();
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}
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} // namespace ROCKSDB_NAMESPACE
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