A leaf node for a transaction. More...

#include <SHAMapTxLeafNode.h>

Inheritance diagram for xrpl::SHAMapTxLeafNode:

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Collaboration diagram for xrpl::SHAMapTxLeafNode:

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Public Member Functions
	SHAMapTxLeafNode (boost::intrusive_ptr< SHAMapItem const > item, std::uint32_t cowid)

	SHAMapTxLeafNode (boost::intrusive_ptr< SHAMapItem const > item, std::uint32_t cowid, SHAMapHash const &hash)

intr_ptr::SharedPtr< SHAMapTreeNode >	clone (std::uint32_t cowid) const final override
	Make a copy of this node, setting the owner.

SHAMapNodeType	getType () const final override
	Determines the type of node.

void	updateHash () final override
	Recalculate the hash of this node.

void	serializeForWire (Serializer &s) const final override
	Serialize the node in a format appropriate for sending over the wire.

void	serializeWithPrefix (Serializer &s) const final override
	Serialize the node in a format appropriate for hashing.

bool	isLeaf () const final override
	Determines if this is a leaf node.

bool	isInner () const final override
	Determines if this is an inner node.

void	invariants (bool is_root=false) const final override

boost::intrusive_ptr< SHAMapItem const > const &	peekItem () const

bool	setItem (boost::intrusive_ptr< SHAMapItem const > i)
	Set the item that this node points to and update the node's hash.

std::string	getString (SHAMapNodeID const &) const final override

virtual void	partialDestructor ()

std::uint32_t	cowid () const
	Returns the SHAMap that owns this node.

void	unshare ()
	If this node is shared with another map, mark it as no longer shared.

SHAMapHash const &	getHash () const
	Return the hash of this node.

void	addStrongRef () const noexcept

void	addWeakRef () const noexcept

ReleaseStrongRefAction	releaseStrongRef () const

ReleaseStrongRefAction	addWeakReleaseStrongRef () const

ReleaseWeakRefAction	releaseWeakRef () const

bool	checkoutStrongRefFromWeak () const noexcept

bool	expired () const noexcept

std::size_t	use_count () const noexcept

Static Public Member Functions
static intr_ptr::SharedPtr< SHAMapTreeNode >	makeFromPrefix (Slice rawNode, SHAMapHash const &hash)

static intr_ptr::SharedPtr< SHAMapTreeNode >	makeFromWire (Slice rawNode)

Protected Attributes
boost::intrusive_ptr< SHAMapItem const >	item_

SHAMapHash	hash_

std::uint32_t	cowid_
	Determines the owning SHAMap, if any.

Private Types
using	CountType = std::uint16_t

using	FieldType = std::uint32_t

Static Private Member Functions
static intr_ptr::SharedPtr< SHAMapTreeNode >	makeTransaction (Slice data, SHAMapHash const &hash, bool hashValid)

static intr_ptr::SharedPtr< SHAMapTreeNode >	makeAccountState (Slice data, SHAMapHash const &hash, bool hashValid)

static intr_ptr::SharedPtr< SHAMapTreeNode >	makeTransactionWithMeta (Slice data, SHAMapHash const &hash, bool hashValid)

static auto &	getCounter () noexcept

Private Attributes
std::atomic< FieldType >	refCounts {strongDelta}
	`refCounts` consists of four fields that are treated atomically:

Static Private Attributes
static constexpr size_t	StrongCountNumBits = sizeof(CountType) * 8

static constexpr size_t	WeakCountNumBits = StrongCountNumBits - 2

static constexpr size_t	FieldTypeBits = sizeof(FieldType) * 8

static constexpr FieldType	one = 1

static constexpr FieldType	strongDelta = 1
	Amount to change the strong count when adding or releasing a reference.

static constexpr FieldType	weakDelta = (one << StrongCountNumBits)
	Amount to change the weak count when adding or releasing a reference.

static constexpr FieldType	partialDestroyStartedMask = (one << (FieldTypeBits - 1))
	Flag that is set when the partialDestroy function has started running (or is about to start running).

static constexpr FieldType	partialDestroyFinishedMask = (one << (FieldTypeBits - 2))
	Flag that is set when the partialDestroy function has finished running.

static constexpr FieldType	tagMask = partialDestroyStartedMask \| partialDestroyFinishedMask
	Mask that will zero out all the `count` bits and leave the tag bits unchanged.

static constexpr FieldType	valueMask = ~tagMask
	Mask that will zero out the `tag` bits and leave the count bits unchanged.

static constexpr FieldType	strongMask = ((one << StrongCountNumBits) - 1) & valueMask
	Mask that will zero out everything except the strong count.

static constexpr FieldType	weakMask = (((one << WeakCountNumBits) - 1) << StrongCountNumBits) & valueMask
	Mask that will zero out everything except the weak count.

Detailed Description

A leaf node for a transaction.

No metadata is included.

Definition at line 12 of file SHAMapTxLeafNode.h.

Member Typedef Documentation

◆ CountType

using xrpl::IntrusiveRefCounts::CountType = std::uint16_t

privateinherited

Definition at line 100 of file IntrusiveRefCounts.h.

◆ FieldType

using xrpl::IntrusiveRefCounts::FieldType = std::uint32_t

privateinherited

Definition at line 103 of file IntrusiveRefCounts.h.

Constructor & Destructor Documentation

◆ SHAMapTxLeafNode() [1/2]

xrpl::SHAMapTxLeafNode::SHAMapTxLeafNode	(	boost::intrusive_ptr< SHAMapItem const >	item,
		std::uint32_t	cowid
	)

Definition at line 15 of file SHAMapTxLeafNode.h.

◆ SHAMapTxLeafNode() [2/2]

xrpl::SHAMapTxLeafNode::SHAMapTxLeafNode	(	boost::intrusive_ptr< SHAMapItem const >	item,
		std::uint32_t	cowid,
		SHAMapHash const &	hash
	)

Definition at line 21 of file SHAMapTxLeafNode.h.

Member Function Documentation

◆ clone()

intr_ptr::SharedPtr< SHAMapTreeNode > xrpl::SHAMapTxLeafNode::clone ( std::uint32_t cowid ) const

finaloverridevirtual

Make a copy of this node, setting the owner.

Implements xrpl::SHAMapTreeNode.

Definition at line 27 of file SHAMapTxLeafNode.h.

◆ getType()

SHAMapNodeType xrpl::SHAMapTxLeafNode::getType ( ) const

finaloverridevirtual

Determines the type of node.

Implements xrpl::SHAMapTreeNode.

Definition at line 33 of file SHAMapTxLeafNode.h.

◆ updateHash()

void xrpl::SHAMapTxLeafNode::updateHash ( )

finaloverridevirtual

Recalculate the hash of this node.

Implements xrpl::SHAMapTreeNode.

Definition at line 39 of file SHAMapTxLeafNode.h.

◆ serializeForWire()

void xrpl::SHAMapTxLeafNode::serializeForWire ( Serializer & ) const

finaloverridevirtual

Serialize the node in a format appropriate for sending over the wire.

Implements xrpl::SHAMapTreeNode.

Definition at line 45 of file SHAMapTxLeafNode.h.

◆ serializeWithPrefix()

void xrpl::SHAMapTxLeafNode::serializeWithPrefix ( Serializer & ) const

finaloverridevirtual

Serialize the node in a format appropriate for hashing.

Implements xrpl::SHAMapTreeNode.

Definition at line 52 of file SHAMapTxLeafNode.h.

◆ isLeaf()

bool xrpl::SHAMapLeafNode::isLeaf ( ) const

finaloverridevirtualinherited

Determines if this is a leaf node.

Implements xrpl::SHAMapTreeNode.

Definition at line 25 of file SHAMapLeafNode.h.

◆ isInner()

bool xrpl::SHAMapLeafNode::isInner ( ) const

finaloverridevirtualinherited

Determines if this is an inner node.

Implements xrpl::SHAMapTreeNode.

Definition at line 31 of file SHAMapLeafNode.h.

◆ invariants()

void xrpl::SHAMapLeafNode::invariants ( bool is_root = false ) const

finaloverridevirtualinherited

Implements xrpl::SHAMapTreeNode.

Definition at line 69 of file SHAMapLeafNode.cpp.

◆ peekItem()

boost::intrusive_ptr< SHAMapItem const > const & xrpl::SHAMapLeafNode::peekItem ( ) const

inherited

Definition at line 25 of file SHAMapLeafNode.cpp.

◆ setItem()

bool xrpl::SHAMapLeafNode::setItem ( boost::intrusive_ptr< SHAMapItem const > i )

inherited

Set the item that this node points to and update the node's hash.

Parameters

i	the new item

Returns: false if the change was, effectively, a noop (that is, if the hash was unchanged); true otherwise.

Definition at line 31 of file SHAMapLeafNode.cpp.

◆ getString()

std::string xrpl::SHAMapLeafNode::getString ( SHAMapNodeID const & id ) const

finaloverridevirtualinherited

Reimplemented from xrpl::SHAMapTreeNode.

Definition at line 44 of file SHAMapLeafNode.cpp.

◆ partialDestructor()

virtual void xrpl::SHAMapTreeNode::partialDestructor ( )

virtualinherited

Reimplemented in xrpl::SHAMapInnerNode.

Definition at line 68 of file SHAMapTreeNode.h.

◆ getHash()

SHAMapHash const & xrpl::SHAMapTreeNode::getHash ( ) const

inherited

Return the hash of this node.

Definition at line 121 of file SHAMapTreeNode.h.

◆ makeFromPrefix()

intr_ptr::SharedPtr< SHAMapTreeNode > xrpl::SHAMapTreeNode::makeFromPrefix	(	Slice	rawNode,
		SHAMapHash const &	hash
	)

staticinherited

Definition at line 109 of file SHAMapTreeNode.cpp.

◆ makeFromWire()

intr_ptr::SharedPtr< SHAMapTreeNode > xrpl::SHAMapTreeNode::makeFromWire ( Slice rawNode )

staticinherited

Definition at line 78 of file SHAMapTreeNode.cpp.

◆ makeTransaction()

intr_ptr::SharedPtr< SHAMapTreeNode > xrpl::SHAMapTreeNode::makeTransaction	(	Slice	data,
		SHAMapHash const &	hash,
		bool	hashValid
	)

staticprivateinherited

Definition at line 16 of file SHAMapTreeNode.cpp.

◆ makeAccountState()

intr_ptr::SharedPtr< SHAMapTreeNode > xrpl::SHAMapTreeNode::makeAccountState	(	Slice	data,
		SHAMapHash const &	hash,
		bool	hashValid
	)

staticprivateinherited

Definition at line 51 of file SHAMapTreeNode.cpp.

◆ makeTransactionWithMeta()

intr_ptr::SharedPtr< SHAMapTreeNode > xrpl::SHAMapTreeNode::makeTransactionWithMeta	(	Slice	data,
		SHAMapHash const &	hash,
		bool	hashValid
	)

staticprivateinherited

Definition at line 27 of file SHAMapTreeNode.cpp.

◆ addStrongRef()

void xrpl::IntrusiveRefCounts::addStrongRef ( ) const

noexceptinherited

Definition at line 224 of file IntrusiveRefCounts.h.

◆ addWeakRef()

void xrpl::IntrusiveRefCounts::addWeakRef ( ) const

noexceptinherited

Definition at line 230 of file IntrusiveRefCounts.h.

◆ releaseStrongRef()

ReleaseStrongRefAction xrpl::IntrusiveRefCounts::releaseStrongRef ( ) const

inherited

Definition at line 236 of file IntrusiveRefCounts.h.

◆ addWeakReleaseStrongRef()

ReleaseStrongRefAction xrpl::IntrusiveRefCounts::addWeakReleaseStrongRef ( ) const

inherited

Definition at line 284 of file IntrusiveRefCounts.h.

◆ releaseWeakRef()

ReleaseWeakRefAction xrpl::IntrusiveRefCounts::releaseWeakRef ( ) const

inherited

Definition at line 337 of file IntrusiveRefCounts.h.

◆ checkoutStrongRefFromWeak()

bool xrpl::IntrusiveRefCounts::checkoutStrongRefFromWeak ( ) const

noexceptinherited

Definition at line 364 of file IntrusiveRefCounts.h.

◆ expired()

bool xrpl::IntrusiveRefCounts::expired ( ) const

noexceptinherited

Definition at line 381 of file IntrusiveRefCounts.h.

◆ use_count()

std::size_t xrpl::IntrusiveRefCounts::use_count ( ) const

noexceptinherited

Definition at line 388 of file IntrusiveRefCounts.h.

◆ getCounter()

static auto & xrpl::CountedObject< SHAMapTxLeafNode >::getCounter ( )

staticprivatenoexceptinherited

Definition at line 109 of file CountedObject.h.

Member Data Documentation

◆ item_

boost::intrusive_ptr<SHAMapItem const> xrpl::SHAMapLeafNode::item_

protectedinherited

Definition at line 13 of file SHAMapLeafNode.h.

◆ hash_

SHAMapHash xrpl::SHAMapTreeNode::hash_

protectedinherited

Definition at line 33 of file SHAMapTreeNode.h.

◆ cowid_

std::uint32_t xrpl::SHAMapTreeNode::cowid_

protectedinherited

Determines the owning SHAMap, if any.

Used for copy-on-write semantics.

If this value is 0, the node is not dirty and does not need to be flushed. It is eligible for sharing and may be included multiple SHAMap instances.

Definition at line 41 of file SHAMapTreeNode.h.

◆ StrongCountNumBits

constexpr size_t xrpl::IntrusiveRefCounts::StrongCountNumBits = sizeof(CountType) * 8

staticconstexprprivateinherited

Definition at line 101 of file IntrusiveRefCounts.h.

◆ WeakCountNumBits

constexpr size_t xrpl::IntrusiveRefCounts::WeakCountNumBits = StrongCountNumBits - 2

staticconstexprprivateinherited

Definition at line 102 of file IntrusiveRefCounts.h.

◆ FieldTypeBits

constexpr size_t xrpl::IntrusiveRefCounts::FieldTypeBits = sizeof(FieldType) * 8

staticconstexprprivateinherited

Definition at line 104 of file IntrusiveRefCounts.h.

◆ one

constexpr FieldType xrpl::IntrusiveRefCounts::one = 1

staticconstexprprivateinherited

Definition at line 105 of file IntrusiveRefCounts.h.

◆ refCounts

std::atomic<FieldType> xrpl::IntrusiveRefCounts::refCounts {strongDelta}

mutableprivateinherited

refCounts consists of four fields that are treated atomically:

Strong count. This is a count of the number of shared pointers that hold a reference to this object. When the strong counts goes to zero, if the weak count is zero, the destructor is run. If the weak count is non-zero when the strong count goes to zero then the partialDestructor is run.
Weak count. This is a count of the number of weak pointer that hold a reference to this object. When the weak count goes to zero and the strong count is also zero, then the destructor is run.
Partial destroy started bit. This bit is set if the partialDestructor function has been started (or is about to be started). This is used to prevent the destructor from running concurrently with the partial destructor. This can easily happen when the last strong pointer release its reference in one thread and starts the partialDestructor, while in another thread the last weak pointer goes out of scope and starts the destructor while the partialDestructor is still running. Both a start and finished bit is needed to handle a corner-case where the last strong pointer goes out of scope, then then last weakPointer goes out of scope, but this happens before the partialDestructor bit is set. It would be possible to use a single bit if it could also be set atomically when the strong count goes to zero and the weak count is non-zero, but that would add complexity (and likely slow down common cases as well).
Partial destroy finished bit. This bit is set when the partialDestructor has finished running. See (3) above for more information.

Definition at line 140 of file IntrusiveRefCounts.h.

◆ strongDelta

constexpr FieldType xrpl::IntrusiveRefCounts::strongDelta = 1

staticconstexprprivateinherited

Amount to change the strong count when adding or releasing a reference.

Note: The strong count is stored in the low StrongCountNumBits bits of refCounts

Definition at line 147 of file IntrusiveRefCounts.h.

◆ weakDelta

constexpr FieldType xrpl::IntrusiveRefCounts::weakDelta = (one << StrongCountNumBits)

staticconstexprprivateinherited

Amount to change the weak count when adding or releasing a reference.

Note: The weak count is stored in the high WeakCountNumBits bits of refCounts

Definition at line 154 of file IntrusiveRefCounts.h.

◆ partialDestroyStartedMask

constexpr FieldType xrpl::IntrusiveRefCounts::partialDestroyStartedMask = (one << (FieldTypeBits - 1))

staticconstexprprivateinherited

Flag that is set when the partialDestroy function has started running (or is about to start running).

See description of the refCounts field for a fuller description of this field.

Definition at line 162 of file IntrusiveRefCounts.h.

◆ partialDestroyFinishedMask

constexpr FieldType xrpl::IntrusiveRefCounts::partialDestroyFinishedMask = (one << (FieldTypeBits - 2))

staticconstexprprivateinherited

Flag that is set when the partialDestroy function has finished running.

See description of the refCounts field for a fuller description of this field.

Definition at line 169 of file IntrusiveRefCounts.h.

◆ tagMask

constexpr FieldType xrpl::IntrusiveRefCounts::tagMask = partialDestroyStartedMask | partialDestroyFinishedMask

staticconstexprprivateinherited

Mask that will zero out all the count bits and leave the tag bits unchanged.

Definition at line 174 of file IntrusiveRefCounts.h.

◆ valueMask

constexpr FieldType xrpl::IntrusiveRefCounts::valueMask = ~tagMask

staticconstexprprivateinherited

Mask that will zero out the tag bits and leave the count bits unchanged.

Definition at line 179 of file IntrusiveRefCounts.h.

◆ strongMask

constexpr FieldType xrpl::IntrusiveRefCounts::strongMask = ((one << StrongCountNumBits) - 1) & valueMask

staticconstexprprivateinherited

Mask that will zero out everything except the strong count.

Definition at line 183 of file IntrusiveRefCounts.h.

◆ weakMask

constexpr FieldType xrpl::IntrusiveRefCounts::weakMask = (((one << WeakCountNumBits) - 1) << StrongCountNumBits) & valueMask

staticconstexprprivateinherited

Mask that will zero out everything except the weak count.

Definition at line 187 of file IntrusiveRefCounts.h.

Public Member Functions

Static Public Member Functions

Protected Attributes

Private Types

Static Private Member Functions

Private Attributes

Static Private Attributes

Detailed Description

Member Typedef Documentation

◆ CountType

◆ FieldType

Constructor & Destructor Documentation

◆ SHAMapTxLeafNode() [1/2]

◆ SHAMapTxLeafNode() [2/2]

Member Function Documentation

◆ clone()

◆ getType()

◆ updateHash()

◆ serializeForWire()

◆ serializeWithPrefix()

◆ isLeaf()

◆ isInner()

◆ invariants()

◆ peekItem()

◆ setItem()

◆ getString()

◆ partialDestructor()

◆ getHash()

◆ makeFromPrefix()

◆ makeFromWire()

◆ makeTransaction()

◆ makeAccountState()

◆ makeTransactionWithMeta()

◆ addStrongRef()

◆ addWeakRef()

◆ releaseStrongRef()

◆ addWeakReleaseStrongRef()

◆ releaseWeakRef()

◆ checkoutStrongRefFromWeak()

◆ expired()

◆ use_count()

◆ getCounter()

Member Data Documentation

◆ item_

◆ hash_

◆ cowid_

◆ StrongCountNumBits

◆ WeakCountNumBits

◆ FieldTypeBits

◆ one

◆ refCounts

◆ strongDelta

◆ weakDelta

◆ partialDestroyStartedMask

◆ partialDestroyFinishedMask

◆ tagMask

◆ valueMask

◆ strongMask

◆ weakMask