This class allows for the storageEngine to alert the rest of the system about journaled write progress. More...

#include <journal_listener.h>

Inheritance diagram for mongo::JournalListener:

Detailed Description

This class allows for the storageEngine to alert the rest of the system about journaled write progress.

It has two methods. The first, getToken(), returns a token representing the current progress applied to the node. It should be called just prior to making writes durable (usually, syncing a journal entry to disk).

The second method, onDurable(), takes this token as an argument and relays to the rest of the system that writes through that point have been journaled. All implementations must be prepared to receive default-constructed Tokens generated by NoOpJournalListener, in case they are activated while a journal commit is in progress.

Public Types
using	Token = repl::OpTime

Public Member Functions
virtual	~JournalListener ()=default

virtual Token	getToken ()=0

virtual void	onDurable (const Token &token)=0

Member Typedef Documentation

◆ Token

using mongo::JournalListener::Token = repl::OpTime

Constructor & Destructor Documentation

◆ ~JournalListener()

virtual mongo::JournalListener::~JournalListener ( )

virtualdefault

Member Function Documentation

◆ getToken()

virtual Token mongo::JournalListener::getToken ( )

pure virtual

Implemented in mongo::NoOpJournalListener.

◆ onDurable()

virtual void mongo::JournalListener::onDurable ( const Token & token )