// 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 "leveldb/cache.h" #include "leveldb/table.h" #include "port/port.h" namespace leveldb { class Env; class TableCache { public: TableCache(const std::string& dbname, const Options* options, int entries); ~TableCache(); // Return an iterator for the specified file number (the corresponding // file length must be exactly "file_size" bytes). 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, uint64_t file_size, 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_