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rocksdb

0.21.0
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RocksDB for Erlang

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rocksdb deps rocksdb db read_callback.h
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deps/rocksdb/db/read_callback.h 

// Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.

//  This source code is licensed under both the GPLv2 (found in the

//  COPYING file in the root directory) and Apache 2.0 License

//  (found in the LICENSE.Apache file in the root directory).



#pragma once



#include "rocksdb/types.h"



namespace rocksdb {



class ReadCallback {

 public:

  virtual ~ReadCallback() {}



  // Will be called to see if the seq number visible; if not it moves on to

  // the next seq number.

  virtual bool IsVisible(SequenceNumber seq) = 0;



  // This is called to determine the maximum visible sequence number for the

  // current transaction for read-your-own-write semantics. This is so that

  // for write unprepared, we will not skip keys that are written by the

  // current transaction with the seek to snapshot optimization.

  //

  // For other uses, this returns zero, meaning that the current snapshot

  // sequence number is the maximum visible sequence number.

  inline virtual SequenceNumber MaxUnpreparedSequenceNumber() { return 0; };

};



}  //  namespace rocksdb