diff options
Diffstat (limited to 'src/txdb.cpp')
| -rw-r--r-- | src/txdb.cpp | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/src/txdb.cpp b/src/txdb.cpp index 762f71feb1..4b76bee5ab 100644 --- a/src/txdb.cpp +++ b/src/txdb.cpp @@ -168,9 +168,34 @@ bool CBlockTreeDB::ReadLastBlockFile(int &nFile) { return Read(DB_LAST_BLOCK, nFile); } -CCoinsViewCursor *CCoinsViewDB::Cursor() const +/** Specialization of CCoinsViewCursor to iterate over a CCoinsViewDB */ +class CCoinsViewDBCursor: public CCoinsViewCursor { - CCoinsViewDBCursor *i = new CCoinsViewDBCursor(const_cast<CDBWrapper&>(*m_db).NewIterator(), GetBestBlock()); +public: + // Prefer using CCoinsViewDB::Cursor() since we want to perform some + // cache warmup on instantiation. + CCoinsViewDBCursor(CDBIterator* pcursorIn, const uint256&hashBlockIn): + CCoinsViewCursor(hashBlockIn), pcursor(pcursorIn) {} + ~CCoinsViewDBCursor() {} + + bool GetKey(COutPoint &key) const override; + bool GetValue(Coin &coin) const override; + unsigned int GetValueSize() const override; + + bool Valid() const override; + void Next() override; + +private: + std::unique_ptr<CDBIterator> pcursor; + std::pair<char, COutPoint> keyTmp; + + friend class CCoinsViewDB; +}; + +std::unique_ptr<CCoinsViewCursor> CCoinsViewDB::Cursor() const +{ + auto i = std::make_unique<CCoinsViewDBCursor>( + const_cast<CDBWrapper&>(*m_db).NewIterator(), GetBestBlock()); /* It seems that there are no "const iterators" for LevelDB. Since we only need read operations on it, use a const-cast to get around that restriction. */ |