Writable ledger view that accumulates state and tx changes. More...

#include <OpenView.h>

Inheritance diagram for xrpl::OpenView:

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Collaboration diagram for xrpl::OpenView:

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Classes
struct	TxData
class	TxsIterImpl

Public Types
using	TxType = std::pair<std::shared_ptr<STTx const>, std::shared_ptr<STObject const>>
using	key_type = UInt256
using	mapped_type = SLE::const_pointer

Public Member Functions
	OpenView ()=delete
OpenView &	operator= (OpenView &&)=delete
OpenView &	operator= (OpenView const &)=delete
	OpenView (OpenView &&)=default
	OpenView (OpenView const &)
	Construct a shallow copy.
	OpenView (OpenLedgerT, ReadView const *base, Rules rules, std::shared_ptr< void const > hold=nullptr)
	Construct an open ledger view.
	OpenView (OpenLedgerT, Rules const &rules, std::shared_ptr< ReadView const > const &base)
	OpenView (BatchViewT, OpenView &base)
	OpenView (ReadView const *base, std::shared_ptr< void const > hold=nullptr)
	Construct a new last closed ledger.
bool	open () const override
	Returns true if this reflects an open ledger.
std::size_t	txCount () const
	Return the number of tx inserted since creation.
void	apply (TxsRawView &to) const
	Apply changes.
LedgerHeader const &	header () const override
	Returns information about the ledger.
Fees const &	fees () const override
	Returns the fees for the base ledger.
Rules const &	rules () const override
	Returns the tx processing rules.
bool	exists (Keylet const &k) const override
	Determine if a state item exists.
std::optional< key_type >	succ (key_type const &key, std::optional< key_type > const &last=std::nullopt) const override
	Return the key of the next state item.
SLE::const_pointer	read (Keylet const &k) const override
	Return the state item associated with a key.
std::unique_ptr< SlesType::IterBase >	slesBegin () const override
std::unique_ptr< SlesType::IterBase >	slesEnd () const override
std::unique_ptr< SlesType::IterBase >	slesUpperBound (UInt256 const &key) const override
std::unique_ptr< TxsType::IterBase >	txsBegin () const override
std::unique_ptr< TxsType::IterBase >	txsEnd () const override
bool	txExists (key_type const &key) const override
	Returns true if a tx exists in the tx map.
TxType	txRead (key_type const &key) const override
	Read a transaction from the tx map.
void	rawErase (SLE::Ref sle) override
	Delete an existing state item.
void	rawInsert (SLE::Ref sle) override
	Unconditionally insert a state item.
void	rawReplace (SLE::Ref sle) override
	Unconditionally replace a state item.
void	rawDestroyXRP (XRPAmount const &fee) override
	Destroy XRP.
void	rawTxInsert (key_type const &key, std::shared_ptr< Serializer const > const &txn, std::shared_ptr< Serializer const > const &metaData) override
	Add a transaction to the tx map.
NetClock::time_point	parentCloseTime () const
	Returns the close time of the previous ledger.
LedgerIndex	seq () const
	Returns the sequence number of the base ledger.
virtual STAmount	balanceHookIOU (AccountID const &account, AccountID const &issuer, STAmount const &amount) const
virtual STAmount	balanceHookMPT (AccountID const &account, MPTIssue const &issue, std::int64_t amount) const
virtual STAmount	balanceHookSelfIssueMPT (MPTIssue const &issue, std::int64_t amount) const
virtual OwnerCounts	ownerCountHook (AccountID const &account, OwnerCounts const &count) const
virtual std::unique_ptr< SlesType::IterBase >	slesUpperBound (key_type const &key) const =0

Public Attributes
SlesType	sles
	Iterable range of ledger state items.
TxsType	txs

Private Types
using	TxsMap

Private Attributes
std::unique_ptr< boost::container::pmr::monotonic_buffer_resource >	monotonicResource_
TxsMap	txs_
Rules	rules_
LedgerHeader	header_
ReadView const *	base_
detail::RawStateTable	items_
std::shared_ptr< void const >	hold_
std::size_t	baseTxCount_ = 0
	In batch mode, the number of transactions already executed.
bool	open_ = true

Static Private Attributes
static constexpr size_t	kInitialBufferSize = kilobytes(256)

Detailed Description

Writable ledger view that accumulates state and tx changes.

Note: Presented as ReadView to clients.

Definition at line 58 of file OpenView.h.

Member Typedef Documentation

◆ TxsMap

using xrpl::OpenView::TxsMap

private

Initial value:

std::map<
       key_type,
       TxData,
       std::less<>,
       boost::container::pmr::polymorphic_allocator<std::pair<key_type const, TxData>>>

Definition at line 85 of file OpenView.h.

◆ TxType

using xrpl::ReadView::TxType = std::pair<std::shared_ptr<STTx const>, std::shared_ptr<STObject const>>

inherited

Definition at line 43 of file ReadView.h.

◆ key_type

using xrpl::ReadView::key_type = UInt256

inherited

Definition at line 45 of file ReadView.h.

◆ mapped_type

using xrpl::ReadView::mapped_type = SLE::const_pointer

inherited

Definition at line 47 of file ReadView.h.

Constructor & Destructor Documentation

◆ OpenView() [1/7]

xrpl::OpenView::OpenView ( )

delete

◆ OpenView() [2/7]

xrpl::OpenView::OpenView ( OpenView && )

default

◆ OpenView() [3/7]

xrpl::OpenView::OpenView ( OpenView const & rhs )

Construct a shallow copy.

Effects:

Creates a new object with a copy of
the modification state table.

The objects managed by shared pointers are not duplicated but shared between instances. Since the SLEs are immutable, calls on the RawView interface cannot break invariants.

Definition at line 79 of file OpenView.cpp.

◆ OpenView() [4/7]

xrpl::OpenView::OpenView	(	OpenLedgerT	,
		ReadView const *	base,
		Rules	rules,
		std::shared_ptr< void const >	hold = nullptr )

Construct an open ledger view.

Effects:

The sequence number is set to the
sequence number of parent plus one.

The parentCloseTime is set to the
closeTime of parent.

If `hold` is not nullptr, retains
ownership of a copy of `hold` until
the MetaView is destroyed.

Calls to rules() will return the
rules provided on construction.

The tx list starts empty and will contain all newly inserted tx.

Definition at line 92 of file OpenView.cpp.

◆ OpenView() [5/7]

xrpl::OpenView::OpenView	(	OpenLedgerT	,
		Rules const &	rules,
		std::shared_ptr< ReadView const > const &	base )

Definition at line 159 of file OpenView.h.

◆ OpenView() [6/7]

xrpl::OpenView::OpenView	(	BatchViewT	,
		OpenView &	base )

Definition at line 164 of file OpenView.h.

◆ OpenView() [7/7]

xrpl::OpenView::OpenView	(	ReadView const *	base,
		std::shared_ptr< void const >	hold = nullptr )

Construct a new last closed ledger.

Effects:

The LedgerHeader is copied from the base.

The rules are inherited from the base.

The tx list starts empty and will contain all newly inserted tx.

Definition at line 108 of file OpenView.cpp.

Member Function Documentation

◆ operator=() [1/2]

OpenView & xrpl::OpenView::operator= ( OpenView && )

delete

◆ operator=() [2/2]

OpenView & xrpl::OpenView::operator= ( OpenView const & )

delete

◆ open()

bool xrpl::OpenView::open ( ) const

overridevirtual

Returns true if this reflects an open ledger.

Implements xrpl::ReadView.

Definition at line 187 of file OpenView.h.

◆ txCount()

std::size_t xrpl::OpenView::txCount ( ) const

Return the number of tx inserted since creation.

This is used to set the "apply ordinal" when calculating transaction metadata.

Definition at line 121 of file OpenView.cpp.

◆ apply()

void xrpl::OpenView::apply ( TxsRawView & to ) const

Apply changes.

Definition at line 127 of file OpenView.cpp.

◆ header()

LedgerHeader const & xrpl::OpenView::header ( ) const

overridevirtual

Returns information about the ledger.

Implements xrpl::ReadView.

Definition at line 137 of file OpenView.cpp.

◆ fees()

Fees const & xrpl::OpenView::fees ( ) const

overridevirtual

Returns the fees for the base ledger.

Implements xrpl::ReadView.

Definition at line 143 of file OpenView.cpp.

◆ rules()

Rules const & xrpl::OpenView::rules ( ) const

overridevirtual

Returns the tx processing rules.

Implements xrpl::ReadView.

Definition at line 149 of file OpenView.cpp.

◆ exists()

bool xrpl::OpenView::exists ( Keylet const & k ) const

overridevirtual

Determine if a state item exists.

Note: This can be more efficient than calling read.

Returns: true if a SLE is associated with the specified key.

Implements xrpl::ReadView.

Definition at line 155 of file OpenView.cpp.

◆ succ()

auto xrpl::OpenView::succ	(	key_type const &	key,
		std::optional< key_type > const &	last = std::nullopt ) const

overridevirtual

Return the key of the next state item.

This returns the key of the first state item whose key is greater than the specified key. If no such key is present, std::nullopt is returned.

If last is engaged, returns std::nullopt when the key returned would be outside the open interval (key, last).

Implements xrpl::ReadView.

Definition at line 161 of file OpenView.cpp.

◆ read()

SLE::const_pointer xrpl::OpenView::read ( Keylet const & k ) const

overridevirtual

Return the state item associated with a key.

Effects: If the key exists, gives the caller ownership of the non-modifiable corresponding SLE.

Note: While the returned SLE is const from the perspective of the caller, it can be changed by other callers through raw operations.

Returns: nullptr if the key is not present or if the type does not match.

Implements xrpl::ReadView.

Definition at line 168 of file OpenView.cpp.

◆ slesBegin()

auto xrpl::OpenView::slesBegin ( ) const

overridevirtual

Implements xrpl::ReadView.

Definition at line 174 of file OpenView.cpp.

◆ slesEnd()

auto xrpl::OpenView::slesEnd ( ) const

overridevirtual

Implements xrpl::ReadView.

Definition at line 180 of file OpenView.cpp.

◆ slesUpperBound() [1/2]

auto xrpl::OpenView::slesUpperBound ( UInt256 const & key ) const

override

Definition at line 186 of file OpenView.cpp.

◆ txsBegin()

auto xrpl::OpenView::txsBegin ( ) const

overridevirtual

Implements xrpl::ReadView.

Definition at line 192 of file OpenView.cpp.

◆ txsEnd()

auto xrpl::OpenView::txsEnd ( ) const

overridevirtual

Implements xrpl::ReadView.

Definition at line 198 of file OpenView.cpp.

◆ txExists()

bool xrpl::OpenView::txExists ( key_type const & key ) const

overridevirtual

Returns true if a tx exists in the tx map.

A tx exists in the map if it is part of the base ledger, or if it is a newly inserted tx.

Implements xrpl::ReadView.

Definition at line 204 of file OpenView.cpp.

◆ txRead()

auto xrpl::OpenView::txRead ( key_type const & key ) const

overridevirtual

Read a transaction from the tx map.

If the view represents an open ledger, the metadata object will be empty.

Returns: A pair of nullptr if the key is not found in the tx map.

Implements xrpl::ReadView.

Definition at line 210 of file OpenView.cpp.

◆ rawErase()

void xrpl::OpenView::rawErase ( SLE::Ref sle )

overridevirtual

Delete an existing state item.

The SLE is provided so the implementation can calculate metadata.

Implements xrpl::RawView.

Definition at line 232 of file OpenView.cpp.

◆ rawInsert()

void xrpl::OpenView::rawInsert ( SLE::Ref sle )

overridevirtual

Unconditionally insert a state item.

Requirements: The key must not already exist.

Effects:

The key is associated with the SLE.

Note: The key is taken from the SLE

Implements xrpl::RawView.

Definition at line 238 of file OpenView.cpp.

◆ rawReplace()

void xrpl::OpenView::rawReplace ( SLE::Ref sle )

overridevirtual

Unconditionally replace a state item.

Requirements:

The key must exist.

Effects:

The key is associated with the SLE.

Note: The key is taken from the SLE

Implements xrpl::RawView.

Definition at line 244 of file OpenView.cpp.

◆ rawDestroyXRP()

void xrpl::OpenView::rawDestroyXRP ( XRPAmount const & fee )

overridevirtual

Destroy XRP.

This is used to pay for transaction fees.

Implements xrpl::RawView.

Definition at line 250 of file OpenView.cpp.

◆ rawTxInsert()

void xrpl::OpenView::rawTxInsert	(	key_type const &	key,
		std::shared_ptr< Serializer const > const &	txn,
		std::shared_ptr< Serializer const > const &	metaData )

overridevirtual

Add a transaction to the tx map.

Closed ledgers must have metadata, while open ledgers omit metadata.

Implements xrpl::TxsRawView.

Definition at line 260 of file OpenView.cpp.

◆ parentCloseTime()

NetClock::time_point xrpl::ReadView::parentCloseTime ( ) const

nodiscardinherited

Returns the close time of the previous ledger.

Definition at line 106 of file ReadView.h.

◆ seq()

LedgerIndex xrpl::ReadView::seq ( ) const

nodiscardinherited

Returns the sequence number of the base ledger.

Definition at line 115 of file ReadView.h.

◆ balanceHookIOU()

virtual STAmount xrpl::ReadView::balanceHookIOU	(	AccountID const &	account,
		AccountID const &	issuer,
		STAmount const &	amount ) const

nodiscardvirtualinherited

Reimplemented in xrpl::PaymentSandbox.

Definition at line 180 of file ReadView.h.

◆ balanceHookMPT()

virtual STAmount xrpl::ReadView::balanceHookMPT	(	AccountID const &	account,
		MPTIssue const &	issue,
		std::int64_t	amount ) const

nodiscardvirtualinherited

Reimplemented in xrpl::PaymentSandbox.

Definition at line 190 of file ReadView.h.

◆ balanceHookSelfIssueMPT()

virtual STAmount xrpl::ReadView::balanceHookSelfIssueMPT	(	MPTIssue const &	issue,
		std::int64_t	amount ) const

nodiscardvirtualinherited

Reimplemented in xrpl::PaymentSandbox.

Definition at line 200 of file ReadView.h.

◆ ownerCountHook()

virtual OwnerCounts xrpl::ReadView::ownerCountHook	(	AccountID const &	account,
		OwnerCounts const &	count ) const

nodiscardvirtualinherited

Reimplemented in xrpl::PaymentSandbox.

Definition at line 211 of file ReadView.h.

◆ slesUpperBound() [2/2]

virtual std::unique_ptr< SlesType::IterBase > xrpl::ReadView::slesUpperBound ( key_type const & key ) const

nodiscardpure virtualinherited

Member Data Documentation

◆ kInitialBufferSize

size_t xrpl::OpenView::kInitialBufferSize = kilobytes(256)

staticconstexprprivate

Definition at line 64 of file OpenView.h.

◆ monotonicResource_

std::unique_ptr<boost::container::pmr::monotonic_buffer_resource> xrpl::OpenView::monotonicResource_

private

Definition at line 93 of file OpenView.h.

◆ txs_

TxsMap xrpl::OpenView::txs_

private

Definition at line 94 of file OpenView.h.

◆ rules_

Rules xrpl::OpenView::rules_

private

Definition at line 95 of file OpenView.h.

◆ header_

LedgerHeader xrpl::OpenView::header_

private

Definition at line 96 of file OpenView.h.

◆ base_

ReadView const* xrpl::OpenView::base_

private

Definition at line 97 of file OpenView.h.

◆ items_

detail::RawStateTable xrpl::OpenView::items_

private

Definition at line 98 of file OpenView.h.

◆ hold_

std::shared_ptr<void const> xrpl::OpenView::hold_

private

Definition at line 99 of file OpenView.h.

◆ baseTxCount_

std::size_t xrpl::OpenView::baseTxCount_ = 0

private

In batch mode, the number of transactions already executed.

Definition at line 104 of file OpenView.h.

◆ open_

bool xrpl::OpenView::open_ = true

private

Definition at line 106 of file OpenView.h.

◆ sles

SlesType xrpl::ReadView::sles

inherited

Iterable range of ledger state items.

Note: Visiting each state entry in the ledger can become quite expensive as the ledger grows.

Definition at line 267 of file ReadView.h.

◆ txs

TxsType xrpl::ReadView::txs

inherited

Definition at line 270 of file ReadView.h.

Classes

Public Types

Public Member Functions

Public Attributes

Private Types

Private Attributes

Static Private Attributes

Detailed Description

Member Typedef Documentation

◆ TxsMap

◆ TxType

◆ key_type

◆ mapped_type

Constructor & Destructor Documentation

◆ OpenView() [1/7]

◆ OpenView() [2/7]

◆ OpenView() [3/7]

◆ OpenView() [4/7]

◆ OpenView() [5/7]

◆ OpenView() [6/7]

◆ OpenView() [7/7]

Member Function Documentation

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ open()

◆ txCount()

◆ apply()

◆ header()

◆ fees()

◆ rules()

◆ exists()

◆ succ()

◆ read()

◆ slesBegin()

◆ slesEnd()

◆ slesUpperBound() [1/2]

◆ txsBegin()

◆ txsEnd()

◆ txExists()

◆ txRead()

◆ rawErase()

◆ rawInsert()

◆ rawReplace()

◆ rawDestroyXRP()

◆ rawTxInsert()

◆ parentCloseTime()

◆ seq()

◆ balanceHookIOU()

◆ balanceHookMPT()

◆ balanceHookSelfIssueMPT()

◆ ownerCountHook()

◆ slesUpperBound() [2/2]

Member Data Documentation

◆ kInitialBufferSize

◆ monotonicResource_

◆ txs_

◆ rules_

◆ header_

◆ base_

◆ items_

◆ hold_

◆ baseTxCount_

◆ open_

◆ sles

◆ txs