xrpl::CachedView< Base > Class Template Reference

Wraps a DigestAwareReadView to provide caching. More...

#include <CachedView.h>

Inheritance diagram for xrpl::CachedView< Base >:

Collaboration diagram for xrpl::CachedView< Base >:

Public Types
using	base_type = Base
using	digest_type = uint256
using	tx_type = 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
	CachedView ()=delete
	CachedView (CachedView const &)=delete
CachedView &	operator= (CachedView const &)=delete
	CachedView (std::shared_ptr< Base const > const &base, CachedSLEs &cache)
std::shared_ptr< Base const > const &	base () const
	Returns the base type.
bool	exists (Keylet const &k) const override
	Determine if a state item exists.
SLE::const_pointer	read (Keylet const &k) const override
	Return the state item associated with a key.
bool	open () const override
	Returns true if this reflects an open ledger.
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.
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.
std::unique_ptr< SlesType::iter_base >	slesBegin () const override
std::unique_ptr< SlesType::iter_base >	slesEnd () const override
std::unique_ptr< SlesType::iter_base >	slesUpperBound (uint256 const &key) const override
virtual std::unique_ptr< SlesType::iter_base >	slesUpperBound (key_type const &key) const =0
std::unique_ptr< TxsType::iter_base >	txsBegin () const override
std::unique_ptr< TxsType::iter_base >	txsEnd () const override
bool	txExists (key_type const &key) const override
	Returns true if a tx exists in the tx map.
tx_type	txRead (key_type const &key) const override
	Read a transaction from the tx map.
std::optional< digest_type >	digest (key_type const &key) const override
	Return the digest associated with the key.
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 std::uint32_t	ownerCountHook (AccountID const &account, std::uint32_t count) const

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

Private Attributes
std::shared_ptr< Base const >	sp_
DigestAwareReadView const &	base_
CachedSLEs &	cache_
std::mutex	mutex_
std::unordered_map< key_type, uint256, HardenedHash<> >	map_

Detailed Description

template<class Base>
class xrpl::CachedView< Base >

Wraps a DigestAwareReadView to provide caching.

Template Parameters

Base	A subclass of DigestAwareReadView

Definition at line 132 of file CachedView.h.

Member Typedef Documentation

base_type

template<class Base>

using xrpl::CachedView< Base >::base_type = Base

Definition at line 140 of file CachedView.h.

digest_type

using xrpl::DigestAwareReadView::digest_type = uint256

inherited

Definition at line 251 of file ReadView.h.

tx_type

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

inherited

Definition at line 33 of file ReadView.h.

key_type

using xrpl::ReadView::key_type = uint256

inherited

Definition at line 35 of file ReadView.h.

mapped_type

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

inherited

Definition at line 37 of file ReadView.h.

Constructor & Destructor Documentation

CachedView() [1/3]

template<class Base>

xrpl::CachedView< Base >::CachedView ( )

delete

CachedView() [2/3]

template<class Base>

xrpl::CachedView< Base >::CachedView ( CachedView< Base > const & )

delete

CachedView() [3/3]

template<class Base>

xrpl::CachedView< Base >::CachedView	(	std::shared_ptr< Base const > const &	base,
		CachedSLEs &	cache )

Definition at line 147 of file CachedView.h.

Member Function Documentation

operator=()

template<class Base>

CachedView & xrpl::CachedView< Base >::operator= ( CachedView< Base > const & )

delete

base()

template<class Base>

std::shared_ptr< Base const > const & xrpl::CachedView< Base >::base

(

)

const

Returns the base type.

Note

This breaks encapsulation and bypasses the cache.

Definition at line 157 of file CachedView.h.

exists()

bool xrpl::detail::CachedViewImpl::exists ( Keylet const & k ) const

overridevirtualinherited

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 16 of file CachedView.cpp.

read()

SLE::const_pointer xrpl::detail::CachedViewImpl::read ( Keylet const & k ) const

overridevirtualinherited

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 22 of file CachedView.cpp.

open()

bool xrpl::detail::CachedViewImpl::open ( ) const

overridevirtualinherited

Returns true if this reflects an open ledger.

Implements xrpl::ReadView.

Definition at line 43 of file CachedView.h.

header()

LedgerHeader const & xrpl::detail::CachedViewImpl::header ( ) const

overridevirtualinherited

Returns information about the ledger.

Implements xrpl::ReadView.

Definition at line 49 of file CachedView.h.

fees()

Fees const & xrpl::detail::CachedViewImpl::fees ( ) const

overridevirtualinherited

Returns the fees for the base ledger.

Implements xrpl::ReadView.

Definition at line 55 of file CachedView.h.

rules()

Rules const & xrpl::detail::CachedViewImpl::rules ( ) const

overridevirtualinherited

Returns the tx processing rules.

Implements xrpl::ReadView.

Definition at line 61 of file CachedView.h.

succ()

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

overridevirtualinherited

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 67 of file CachedView.h.

slesBegin()

std::unique_ptr< SlesType::iter_base > xrpl::detail::CachedViewImpl::slesBegin ( ) const

overridevirtualinherited

Implements xrpl::ReadView.

Definition at line 73 of file CachedView.h.

slesEnd()

std::unique_ptr< SlesType::iter_base > xrpl::detail::CachedViewImpl::slesEnd ( ) const

overridevirtualinherited

Implements xrpl::ReadView.

Definition at line 79 of file CachedView.h.

slesUpperBound() [1/2]

std::unique_ptr< SlesType::iter_base > xrpl::detail::CachedViewImpl::slesUpperBound ( uint256 const & key ) const

overrideinherited

Definition at line 85 of file CachedView.h.

slesUpperBound() [2/2]

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

nodiscardpure virtualinherited

txsBegin()

std::unique_ptr< TxsType::iter_base > xrpl::detail::CachedViewImpl::txsBegin ( ) const

overridevirtualinherited

Implements xrpl::ReadView.

Definition at line 91 of file CachedView.h.

txsEnd()

std::unique_ptr< TxsType::iter_base > xrpl::detail::CachedViewImpl::txsEnd ( ) const

overridevirtualinherited

Implements xrpl::ReadView.

Definition at line 97 of file CachedView.h.

txExists()

bool xrpl::detail::CachedViewImpl::txExists ( key_type const & key ) const

overridevirtualinherited

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 103 of file CachedView.h.

txRead()

tx_type xrpl::detail::CachedViewImpl::txRead ( key_type const & key ) const

overridevirtualinherited

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 109 of file CachedView.h.

digest()

std::optional< digest_type > xrpl::detail::CachedViewImpl::digest ( key_type const & key ) const

overridevirtualinherited

Return the digest associated with the key.

Returns

std::nullopt if the item does not exist.

Implements xrpl::DigestAwareReadView.

Definition at line 119 of file CachedView.h.

parentCloseTime()

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

nodiscardinherited

Returns the close time of the previous ledger.

Definition at line 90 of file ReadView.h.

seq()

LedgerIndex xrpl::ReadView::seq ( ) const

nodiscardinherited

Returns the sequence number of the base ledger.

Definition at line 97 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 155 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 165 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 175 of file ReadView.h.

ownerCountHook()

virtual std::uint32_t xrpl::ReadView::ownerCountHook ( AccountID const & account, std::uint32_t count ) const

nodiscardvirtualinherited

Reimplemented in xrpl::PaymentSandbox.

Definition at line 186 of file ReadView.h.

Member Data Documentation

sp_

template<class Base>

std::shared_ptr<Base const> xrpl::CachedView< Base >::sp_

private

Definition at line 137 of file CachedView.h.

base_

DigestAwareReadView const& xrpl::detail::CachedViewImpl::base_

privateinherited

Definition at line 17 of file CachedView.h.

cache_

CachedSLEs& xrpl::detail::CachedViewImpl::cache_

privateinherited

Definition at line 18 of file CachedView.h.

mutex_

std::mutex xrpl::detail::CachedViewImpl::mutex_

mutableprivateinherited

Definition at line 19 of file CachedView.h.

map_

std::unordered_map<key_type, uint256, HardenedHash<> > xrpl::detail::CachedViewImpl::map_

mutableprivateinherited

Definition at line 20 of file CachedView.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 239 of file ReadView.h.

txs

TxsType xrpl::ReadView::txs

inherited

Definition at line 242 of file ReadView.h.