git-svn-id: https://leveldb.googlecode.com/svn/trunk@2 62dab493-f737-651d-591e-8d6aee1b9529
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
// 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)
|
|
|
|
#ifndef STORAGE_LEVELDB_DB_TABLE_CACHE_H_
|
|
#define STORAGE_LEVELDB_DB_TABLE_CACHE_H_
|
|
|
|
#include <string>
|
|
#include <stdint.h>
|
|
#include "db/dbformat.h"
|
|
#include "include/cache.h"
|
|
#include "include/table.h"
|
|
#include "port/port.h"
|
|
|
|
namespace leveldb {
|
|
|
|
class Env;
|
|
|
|
class TableCache {
|
|
public:
|
|
TableCache(const std::string& dbname, const Options* options, int entries);
|
|
~TableCache();
|
|
|
|
// Get an iterator for the specified file number and return it. If
|
|
// "tableptr" is non-NULL, also sets "*tableptr" to point to the
|
|
// Table object underlying the returned iterator, or NULL 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.
|
|
Iterator* NewIterator(const ReadOptions& options,
|
|
uint64_t file_number,
|
|
Table** tableptr = NULL);
|
|
|
|
// Evict any entry for the specified file number
|
|
void Evict(uint64_t file_number);
|
|
|
|
private:
|
|
Env* const env_;
|
|
const std::string dbname_;
|
|
const Options* options_;
|
|
Cache* cache_;
|
|
};
|
|
|
|
}
|
|
|
|
#endif // STORAGE_LEVELDB_DB_TABLE_CACHE_H_
|