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Diffstat (limited to 'db/table_cache.h')
-rw-r--r-- | db/table_cache.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/db/table_cache.h b/db/table_cache.h new file mode 100644 index 0000000..5376194 --- /dev/null +++ b/db/table_cache.h @@ -0,0 +1,50 @@ +// 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_ |