write_batch_internal.h raw

   1  // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
   2  // Use of this source code is governed by a BSD-style license that can be
   3  // found in the LICENSE file. See the AUTHORS file for names of contributors.
   4  
   5  #ifndef STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
   6  #define STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
   7  
   8  #include "db/dbformat.h"
   9  #include "leveldb/write_batch.h"
  10  
  11  namespace leveldb {
  12  
  13  class MemTable;
  14  
  15  // WriteBatchInternal provides static methods for manipulating a
  16  // WriteBatch that we don't want in the public WriteBatch interface.
  17  class WriteBatchInternal {
  18   public:
  19    // Return the number of entries in the batch.
  20    static int Count(const WriteBatch* batch);
  21  
  22    // Set the count for the number of entries in the batch.
  23    static void SetCount(WriteBatch* batch, int n);
  24  
  25    // Return the sequence number for the start of this batch.
  26    static SequenceNumber Sequence(const WriteBatch* batch);
  27  
  28    // Store the specified number as the sequence number for the start of
  29    // this batch.
  30    static void SetSequence(WriteBatch* batch, SequenceNumber seq);
  31  
  32    static Slice Contents(const WriteBatch* batch) { return Slice(batch->rep_); }
  33  
  34    static size_t ByteSize(const WriteBatch* batch) { return batch->rep_.size(); }
  35  
  36    static void SetContents(WriteBatch* batch, const Slice& contents);
  37  
  38    static Status InsertInto(const WriteBatch* batch, MemTable* memtable);
  39  
  40    static void Append(WriteBatch* dst, const WriteBatch* src);
  41  };
  42  
  43  }  // namespace leveldb
  44  
  45  #endif  // STORAGE_LEVELDB_DB_WRITE_BATCH_INTERNAL_H_
  46