mirror of https://github.com/facebook/rocksdb.git
118 lines
4.7 KiB
C++
118 lines
4.7 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
//
|
|
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
//
|
|
// Thread-safe (provides internal synchronization)
|
|
|
|
#pragma once
|
|
#include <string>
|
|
#include <vector>
|
|
#include <stdint.h>
|
|
|
|
#include "db/dbformat.h"
|
|
#include "port/port.h"
|
|
#include "rocksdb/cache.h"
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/table.h"
|
|
#include "rocksdb/options.h"
|
|
#include "table/table_reader.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
class Env;
|
|
class Arena;
|
|
struct FileDescriptor;
|
|
class GetContext;
|
|
class HistogramImpl;
|
|
class InternalIterator;
|
|
|
|
class TableCache {
|
|
public:
|
|
TableCache(const ImmutableCFOptions& ioptions,
|
|
const EnvOptions& storage_options, Cache* cache);
|
|
~TableCache();
|
|
|
|
// Return an iterator for the specified file number (the corresponding
|
|
// file length must be exactly "file_size" bytes). If "tableptr" is
|
|
// non-nullptr, also sets "*tableptr" to point to the Table object
|
|
// underlying the returned iterator, or nullptr if no Table object underlies
|
|
// the returned iterator. The returned "*tableptr" object is owned by
|
|
// the cache and should not be deleted, and is valid for as long as the
|
|
// returned iterator is live.
|
|
// @param skip_filters Disables loading/accessing the filter block
|
|
InternalIterator* NewIterator(
|
|
const ReadOptions& options, const EnvOptions& toptions,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileDescriptor& file_fd, TableReader** table_reader_ptr = nullptr,
|
|
HistogramImpl* file_read_hist = nullptr, bool for_compaction = false,
|
|
Arena* arena = nullptr, bool skip_filters = false);
|
|
|
|
// If a seek to internal key "k" in specified file finds an entry,
|
|
// call (*handle_result)(arg, found_key, found_value) repeatedly until
|
|
// it returns false.
|
|
// @param skip_filters Disables loading/accessing the filter block
|
|
Status Get(const ReadOptions& options,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileDescriptor& file_fd, const Slice& k,
|
|
GetContext* get_context, HistogramImpl* file_read_hist = nullptr,
|
|
bool skip_filters = false);
|
|
|
|
// Evict any entry for the specified file number
|
|
static void Evict(Cache* cache, uint64_t file_number);
|
|
|
|
// Find table reader
|
|
// @param skip_filters Disables loading/accessing the filter block
|
|
Status FindTable(const EnvOptions& toptions,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileDescriptor& file_fd, Cache::Handle**,
|
|
const bool no_io = false, bool record_read_stats = true,
|
|
HistogramImpl* file_read_hist = nullptr,
|
|
bool skip_filters = false);
|
|
|
|
// Get TableReader from a cache handle.
|
|
TableReader* GetTableReaderFromHandle(Cache::Handle* handle);
|
|
|
|
// Get the table properties of a given table.
|
|
// @no_io: indicates if we should load table to the cache if it is not present
|
|
// in table cache yet.
|
|
// @returns: `properties` will be reset on success. Please note that we will
|
|
// return Status::Incomplete() if table is not present in cache and
|
|
// we set `no_io` to be true.
|
|
Status GetTableProperties(const EnvOptions& toptions,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileDescriptor& file_meta,
|
|
std::shared_ptr<const TableProperties>* properties,
|
|
bool no_io = false);
|
|
|
|
// Return total memory usage of the table reader of the file.
|
|
// 0 if table reader of the file is not loaded.
|
|
size_t GetMemoryUsageByTableReader(
|
|
const EnvOptions& toptions,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileDescriptor& fd);
|
|
|
|
// Release the handle from a cache
|
|
void ReleaseHandle(Cache::Handle* handle);
|
|
|
|
private:
|
|
// Build a table reader
|
|
Status GetTableReader(const EnvOptions& env_options,
|
|
const InternalKeyComparator& internal_comparator,
|
|
const FileDescriptor& fd, bool sequential_mode,
|
|
bool record_read_stats, HistogramImpl* file_read_hist,
|
|
unique_ptr<TableReader>* table_reader,
|
|
bool skip_filters = false);
|
|
|
|
const ImmutableCFOptions& ioptions_;
|
|
const EnvOptions& env_options_;
|
|
Cache* const cache_;
|
|
std::string row_cache_id_;
|
|
};
|
|
|
|
} // namespace rocksdb
|