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-rw-r--r--src/leveldb/db/memtable.h91
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diff --git a/src/leveldb/db/memtable.h b/src/leveldb/db/memtable.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.
-
-#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_