xrpl::TimeKeeper Class Reference

Manages various times used by the server. More...

#include <TimeKeeper.h>

Inheritance diagram for xrpl::TimeKeeper:

Collaboration diagram for xrpl::TimeKeeper:

Public Types
using	rep
using	period
using	duration
using	time_point
using	clock_type

Public Member Functions
	~TimeKeeper () override=default
time_point	now () const override
	Returns the current time, using the server's clock.
time_point	closeTime () const
	Returns the predicted close time, in network time.
std::chrono::seconds	closeOffset () const
std::chrono::seconds	adjustCloseTime (std::chrono::seconds by)
	Adjust the close time, based on the network's view of time.

Static Public Attributes
static bool const	is_steady

Static Private Member Functions
static constexpr time_point	adjust (std::chrono::system_clock::time_point when)

Private Attributes
std::atomic< std::chrono::seconds >	closeOffset_

Detailed Description

Manages various times used by the server.

Definition at line 14 of file TimeKeeper.h.

Member Typedef Documentation

rep

using beast::AbstractClock< NetClock >::rep

inherited

Definition at line 38 of file abstract_clock.h.

period

using beast::AbstractClock< NetClock >::period

inherited

Definition at line 39 of file abstract_clock.h.

duration

using beast::AbstractClock< NetClock >::duration

inherited

Definition at line 40 of file abstract_clock.h.

time_point

using beast::AbstractClock< NetClock >::time_point

inherited

Definition at line 41 of file abstract_clock.h.

clock_type

using beast::AbstractClock< NetClock >::clock_type

inherited

Definition at line 42 of file abstract_clock.h.

Constructor & Destructor Documentation

~TimeKeeper()

xrpl::TimeKeeper::~TimeKeeper ( )

overridedefault

Member Function Documentation

adjust()

constexpr time_point xrpl::TimeKeeper::adjust ( std::chrono::system_clock::time_point when )

staticconstexprprivate

Definition at line 21 of file TimeKeeper.h.

now()

time_point xrpl::TimeKeeper::now ( ) const

nodiscardoverridevirtual

Returns the current time, using the server's clock.

It's possible for servers to have a different value for network time, especially if they do not use some external mechanism for time synchronization (e.g. NTP or SNTP). This is fine.

This estimate is not directly visible to other servers over the protocol, but it is possible for them to make an educated guess if this server publishes proposals or validations.

Note

The network time is adjusted for the "XRPL epoch" which was arbitrarily defined as 2000-01-01T00:00:00Z by Arthur Britto and David Schwartz during early development of the code. No rationale has been provided for this curious and annoying, but otherwise unimportant, choice.

Implements beast::AbstractClock< NetClock >.

Definition at line 48 of file TimeKeeper.h.

closeTime()

time_point xrpl::TimeKeeper::closeTime ( ) const

nodiscard

Returns the predicted close time, in network time.

The predicted close time represents the notional "center" of the network. Each server assumes that its clock is correct and tries to pull the close time towards its measure of network time.

Definition at line 61 of file TimeKeeper.h.

closeOffset()

std::chrono::seconds xrpl::TimeKeeper::closeOffset ( ) const

nodiscard

Definition at line 68 of file TimeKeeper.h.

adjustCloseTime()

std::chrono::seconds xrpl::TimeKeeper::adjustCloseTime

(

std::chrono::seconds

by

)

Adjust the close time, based on the network's view of time.

Definition at line 77 of file TimeKeeper.h.

Member Data Documentation

closeOffset_

std::atomic<std::chrono::seconds> xrpl::TimeKeeper::closeOffset_

private

Definition at line 17 of file TimeKeeper.h.

is_steady

bool const beast::AbstractClock< NetClock >::is_steady

staticinherited

Definition at line 44 of file abstract_clock.h.