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rocksdb/db/table_cache.h

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// 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_