A DB snapshot providing consistent multiple reads if possible. Thread-safe. More...

#include <KeyValue.h>

Inheritance diagram for GLnexus::KeyValue::Reader:

Public Member Functions
virtual Status	get (CollectionHandle coll, const std::string &key, std::string &value) const =0

virtual Status	iterator (CollectionHandle coll, const std::string &key, std::unique_ptr< Iterator > &it) const =0

Detailed Description

A DB snapshot providing consistent multiple reads if possible. Thread-safe.

Member Function Documentation

virtual Status GLnexus::KeyValue::Reader::get	(	CollectionHandle	coll,
		const std::string &	key,
		std::string &	value
	)		const

pure virtual

Get the value corresponding to the key and return OK. Return NotFound if no corresponding record exists in the collection, or any error code

Implemented in GLnexus::RocksKeyValue::DB, GLnexus::RocksKeyValue::Reader, and GLnexus::KeyValue::DB.

virtual Status GLnexus::KeyValue::Reader::iterator	(	CollectionHandle	coll,
		const std::string &	key,
		std::unique_ptr< Iterator > &	it
	)		const

pure virtual

Create an iterator positioned at the first key equal to or greater than the given one. If key is empty then position at the beginning of the collection.

If there are no extant keys equal to or greater than the given one, the return status will be OK but it->valid() will be false.

Implemented in GLnexus::KeyValue::DB.

The documentation for this class was generated from the following file:

include/KeyValue.h

Public Member Functions

Detailed Description

Member Function Documentation