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Diffstat (limited to 'src/leveldb/db/memtable.h')
-rw-r--r-- | src/leveldb/db/memtable.h | 91 |
1 files changed, 0 insertions, 91 deletions
diff --git a/src/leveldb/db/memtable.h b/src/leveldb/db/memtable.h deleted file mode 100644 index 92e90bb09..000000000 --- a/src/leveldb/db/memtable.h +++ /dev/null @@ -1,91 +0,0 @@ -// 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. - -#ifndef STORAGE_LEVELDB_DB_MEMTABLE_H_ -#define STORAGE_LEVELDB_DB_MEMTABLE_H_ - -#include <string> -#include "leveldb/db.h" -#include "db/dbformat.h" -#include "db/skiplist.h" -#include "util/arena.h" - -namespace leveldb { - -class InternalKeyComparator; -class Mutex; -class MemTableIterator; - -class MemTable { - public: - // MemTables are reference counted. The initial reference count - // is zero and the caller must call Ref() at least once. - explicit MemTable(const InternalKeyComparator& comparator); - - // Increase reference count. - void Ref() { ++refs_; } - - // Drop reference count. Delete if no more references exist. - void Unref() { - --refs_; - assert(refs_ >= 0); - if (refs_ <= 0) { - delete this; - } - } - - // Returns an estimate of the number of bytes of data in use by this - // data structure. - // - // REQUIRES: external synchronization to prevent simultaneous - // operations on the same MemTable. - size_t ApproximateMemoryUsage(); - - // Return an iterator that yields the contents of the memtable. - // - // The caller must ensure that the underlying MemTable remains live - // while the returned iterator is live. The keys returned by this - // iterator are internal keys encoded by AppendInternalKey in the - // db/format.{h,cc} module. - Iterator* NewIterator(); - - // Add an entry into memtable that maps key to value at the - // specified sequence number and with the specified type. - // Typically value will be empty if type==kTypeDeletion. - void Add(SequenceNumber seq, ValueType type, - const Slice& key, - const Slice& value); - - // If memtable contains a value for key, store it in *value and return true. - // If memtable contains a deletion for key, store a NotFound() error - // in *status and return true. - // Else, return false. - bool Get(const LookupKey& key, std::string* value, Status* s); - - private: - ~MemTable(); // Private since only Unref() should be used to delete it - - struct KeyComparator { - const InternalKeyComparator comparator; - explicit KeyComparator(const InternalKeyComparator& c) : comparator(c) { } - int operator()(const char* a, const char* b) const; - }; - friend class MemTableIterator; - friend class MemTableBackwardIterator; - - typedef SkipList<const char*, KeyComparator> Table; - - KeyComparator comparator_; - int refs_; - Arena arena_; - Table table_; - - // No copying allowed - MemTable(const MemTable&); - void operator=(const MemTable&); -}; - -} // namespace leveldb - -#endif // STORAGE_LEVELDB_DB_MEMTABLE_H_ |