oceanbase::ObLsmIterator类 参考

Abstract class for iterating over key-value pairs in an LSM-Tree. 更多...

#include <ob_lsm_iterator.h>

类 oceanbase::ObLsmIterator 继承关系图:

Public 成员函数
	ObLsmIterator (const ObLsmIterator &)=delete
ObLsmIterator &	operator= (const ObLsmIterator &)=delete
virtual bool	valid () const =0
	Checks if the iterator is currently positioned at a valid key-value pair. 更多...
virtual void	next ()=0
	Moves the iterator to the next key-value pair in the source. 更多...
virtual string_view	key () const =0
	Returns the key of the current entry the iterator is positioned at. 更多...
virtual string_view	value () const =0
	Returns the value of the current entry the iterator is positioned at. 更多...
virtual void	seek (const string_view &k)=0
	Positions the iterator at the first entry with a key greater than or equal to the specified key. 更多...
virtual void	seek_to_first ()=0
	Positions the iterator at the first key-value pair in the source. 更多...
virtual void	seek_to_last ()=0
	Positions the iterator at the last key-value pair in the source. 更多...

详细描述

Abstract class for iterating over key-value pairs in an LSM-Tree.

This class provides an interface for iterators used to traverse key-value entries stored in an LSM-Tree. Derived classes must implement this interface to handle specific storage structures, such as SSTables or MemTables.

成员函数说明

key()

virtual string_view oceanbase::ObLsmIterator::key ( ) const

pure virtual

Returns the key of the current entry the iterator is positioned at.

This method retrieves the key corresponding to the key-value pair at the current position of the iterator.

返回

A string_view containing the key of the current entry.

在 oceanbase::ObMemTableIterator, oceanbase::TrxIterator, oceanbase::ObUserIterator, oceanbase::BlockIterator, oceanbase::ObMergingIterator , 以及 oceanbase::TableIterator 内被实现.

next()

virtual void oceanbase::ObLsmIterator::next ( )

pure virtual

Moves the iterator to the next key-value pair in the source.

在 oceanbase::ObMemTableIterator, oceanbase::TrxIterator, oceanbase::ObUserIterator, oceanbase::BlockIterator, oceanbase::ObMergingIterator , 以及 oceanbase::TableIterator 内被实现.

seek()

virtual void oceanbase::ObLsmIterator::seek ( const string_view &  k )

pure virtual

Positions the iterator at the first entry with a key greater than or equal to the specified key.

参数

k	The key to search for.

在 oceanbase::ObMemTableIterator, oceanbase::TrxIterator, oceanbase::TableIterator, oceanbase::BlockIterator, oceanbase::ObUserIterator , 以及 oceanbase::ObMergingIterator 内被实现.

seek_to_first()

virtual void oceanbase::ObLsmIterator::seek_to_first ( )

pure virtual

Positions the iterator at the first key-value pair in the source.

在 oceanbase::ObMemTableIterator, oceanbase::TrxIterator, oceanbase::ObUserIterator, oceanbase::BlockIterator, oceanbase::ObMergingIterator , 以及 oceanbase::TableIterator 内被实现.

seek_to_last()

virtual void oceanbase::ObLsmIterator::seek_to_last ( )

pure virtual

Positions the iterator at the last key-value pair in the source.

在 oceanbase::ObMemTableIterator, oceanbase::TrxIterator, oceanbase::ObUserIterator, oceanbase::BlockIterator, oceanbase::ObMergingIterator , 以及 oceanbase::TableIterator 内被实现.

valid()

virtual bool oceanbase::ObLsmIterator::valid ( ) const

pure virtual

Checks if the iterator is currently positioned at a valid key-value pair.

返回

true if the iterator is valid, false otherwise.

在 oceanbase::ObMemTableIterator, oceanbase::TrxIterator, oceanbase::ObUserIterator, oceanbase::BlockIterator, oceanbase::ObMergingIterator , 以及 oceanbase::TableIterator 内被实现.

value()

virtual string_view oceanbase::ObLsmIterator::value ( ) const

pure virtual

Returns the value of the current entry the iterator is positioned at.

This method retrieves the value corresponding to the key-value pair at the current position of the iterator.

返回

A string_view containing the value of the current entry.

在 oceanbase::ObMemTableIterator, oceanbase::TrxIterator, oceanbase::ObUserIterator, oceanbase::BlockIterator, oceanbase::ObMergingIterator , 以及 oceanbase::TableIterator 内被实现.

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该类的文档由以下文件生成:

• src/oblsm/include/ob_lsm_iterator.h