fastmm::StrategyStateMsg Struct Reference

Journal only: what a replay or a backtest over the journal can start from. More...

#include <fastmm/core/messages.hpp>

Public Types
enum class	Kind : std::uint8_t { Restored = 0 , Snapshot = 1 }

Public Member Functions
const std::byte *	data () const noexcept

Static Public Member Functions
static constexpr std::uint32_t	size_for (std::uint32_t n) noexcept

Public Attributes
EventHeader	hdr
std::uint64_t	id
std::uint32_t	total
	bytes of the part
std::uint32_t	offset
	of this record's bytes in the part
std::uint32_t	bytes
	after the head
Kind	kind
std::uint8_t	part
std::uint8_t	flags
std::uint8_t	pad_ [37]

Static Public Attributes
static constexpr std::uint8_t	kStatePart = 0
static constexpr std::uint8_t	kPositionsPart = 1
static constexpr std::uint8_t	kAccepted = 1U << 0
static constexpr std::uint32_t	kChunkBytes = 16384

Detailed Description

Journal only: what a replay or a backtest over the journal can start from.

The bytes the strategy was handed to restore() at the start (Kind::Restored, flagged kAccepted when it took them), and every [strategy] state_snapshot_interval_s its state() with the engine's positions (Kind::Snapshot). One state is written as records of at most kChunkBytes each: id numbers the states of the session, part says what the bytes are (kStatePart: the strategy's state; kPositionsPart: StatePosition entries), and offset / total place them in it. A record is the 128-byte head and its bytes padded to 64. Never dispatched.

Member Enumeration Documentation

Kind

enum class fastmm::StrategyStateMsg::Kind : std::uint8_t

strong

Enumerator
Restored
Snapshot

Member Function Documentation

size_for()

static constexpr std::uint32_t fastmm::StrategyStateMsg::size_for ( std::uint32_t  n )

inlinestaticconstexprnoexcept

data()

const std::byte * fastmm::StrategyStateMsg::data ( ) const

inlinenoexcept

Member Data Documentation

kStatePart

constexpr std::uint8_t fastmm::StrategyStateMsg::kStatePart = 0

staticconstexpr

kPositionsPart

constexpr std::uint8_t fastmm::StrategyStateMsg::kPositionsPart = 1

staticconstexpr

kAccepted

constexpr std::uint8_t fastmm::StrategyStateMsg::kAccepted = 1U << 0

staticconstexpr

kChunkBytes

constexpr std::uint32_t fastmm::StrategyStateMsg::kChunkBytes = 16384

staticconstexpr

hdr

EventHeader fastmm::StrategyStateMsg::hdr

id

std::uint64_t fastmm::StrategyStateMsg::id

total

std::uint32_t fastmm::StrategyStateMsg::total

bytes of the part

offset

std::uint32_t fastmm::StrategyStateMsg::offset

of this record's bytes in the part

bytes

std::uint32_t fastmm::StrategyStateMsg::bytes

after the head

kind

Kind fastmm::StrategyStateMsg::kind

part

std::uint8_t fastmm::StrategyStateMsg::part

flags

std::uint8_t fastmm::StrategyStateMsg::flags

pad_

std::uint8_t fastmm::StrategyStateMsg::pad_[37]