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49 rader
1.4 KiB
49 rader
1.4 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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// Thread-safe (provides internal synchronization)
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#ifndef STORAGE_LEVELDB_DB_TABLE_CACHE_H_
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#define STORAGE_LEVELDB_DB_TABLE_CACHE_H_
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#include <string>
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#include <stdint.h>
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#include "db/dbformat.h"
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#include "include/cache.h"
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#include "include/table.h"
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#include "port/port.h"
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namespace leveldb {
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class Env;
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class TableCache {
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public:
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TableCache(const std::string& dbname, const Options* options, int entries);
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~TableCache();
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// Get an iterator for the specified file number and return it. If
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// "tableptr" is non-NULL, also sets "*tableptr" to point to the
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// Table object underlying the returned iterator, or NULL if no
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// Table object underlies the returned iterator. The returned
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// "*tableptr" object is owned by the cache and should not be
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// deleted, and is valid for as long as the returned iterator is
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// live.
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Iterator* NewIterator(const ReadOptions& options,
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uint64_t file_number,
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Table** tableptr = NULL);
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// Evict any entry for the specified file number
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void Evict(uint64_t file_number);
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private:
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Env* const env_;
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const std::string dbname_;
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const Options* options_;
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Cache* cache_;
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};
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}
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#endif // STORAGE_LEVELDB_DB_TABLE_CACHE_H_
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