Implementation of Participant. See also pimpl ideom (https://en.cppreference.com/w/cpp/language/pimpl). More...

#include <ParticipantImpl.hpp>

Collaboration diagram for precice::impl::ParticipantImpl:

Classes
struct	MappedSamples

Public Member Functions
const mesh::Mesh &	mesh (const std::string &meshName) const
	Allows to access a registered mesh.

MappedSamples	mappedSamples () const
	Returns the amount of mapped read and write samples in the last call to advance.

	ParticipantImpl (ParticipantImpl const &)=delete
	Disable copy construction.

ParticipantImpl &	operator= (ParticipantImpl const &)=delete
	Disable assignment construction.

	ParticipantImpl (ParticipantImpl &&)=delete
	Disable move construction.

ParticipantImpl &	operator= (ParticipantImpl &&)=delete
	Disable move assignment.

Construction and Configuration
	ParticipantImpl (std::string_view participantName, std::string_view configurationFileName, int solverProcessIndex, int solverProcessSize, std::optional< void * > communicator)
	Generic constructor for ParticipantImpl.

	~ParticipantImpl ()
	Destructor.

Steering Methods
void	initialize ()
	Fully initializes preCICE and coupling data.

void	advance (double computedTimeStepSize)
	Advances preCICE after the solver has computed one time step.

void	finalize ()
	Finalizes preCICE.

Status Queries
int	getMeshDimensions (std::string_view meshName) const
	Returns the spatial dimensionality of the given mesh.

int	getDataDimensions (std::string_view meshName, std::string_view dataName) const
	Returns the spatial dimensionality of the given data on the given mesh.

bool	isCouplingOngoing () const
	Checks if the coupled simulation is still ongoing.

bool	isTimeWindowComplete () const
	Checks if the current coupling window is completed.

double	getMaxTimeStepSize () const
	Get the maximum allowed time step size of the current window.

Requirements
bool	requiresInitialData ()

bool	requiresReadingCheckpoint ()

bool	requiresWritingCheckpoint ()

Mesh Access

void	resetMesh (std::string_view meshName)

bool	requiresMeshConnectivityFor (std::string_view meshName) const
	Checks if the given mesh requires connectivity.

bool	requiresGradientDataFor (std::string_view meshName, std::string_view dataName) const
	Checks if the given data set requires gradient data. We check if the data object has been initialized with the gradient flag.

VertexID	setMeshVertex (std::string_view meshName, ::precice::span< const double > position)
	Creates a mesh vertex.

int	getMeshVertexSize (std::string_view meshName) const
	Returns the number of vertices of a mesh.

void	setMeshVertices (std::string_view meshName, ::precice::span< const double > positions, ::precice::span< VertexID > ids)
	Creates multiple mesh vertices.

void	setMeshEdge (std::string_view meshName, VertexID first, VertexID second)
	Sets a mesh edge from vertex IDs.

void	setMeshEdges (std::string_view meshName, ::precice::span< const VertexID > vertices)
	Sets multiple mesh edges from vertex IDs.

void	setMeshTriangle (std::string_view meshName, VertexID first, VertexID second, VertexID third)
	Sets mesh triangle from vertex IDs.

void	setMeshTriangles (std::string_view meshName, ::precice::span< const VertexID > vertices)
	Sets multiple mesh triangles from vertex IDs.

void	setMeshQuad (std::string_view meshName, VertexID first, VertexID second, VertexID third, VertexID fourth)
	Sets a planar surface mesh quadrangle from vertex IDs.

void	setMeshQuads (std::string_view meshName, ::precice::span< const VertexID > vertices)
	Sets multiple mesh quads from vertex IDs.

void	setMeshTetrahedron (std::string_view meshName, VertexID first, VertexID second, VertexID third, VertexID fourth)
	Set tetrahedron in 3D mesh from vertex ID.

void	setMeshTetrahedra (std::string_view meshName, ::precice::span< const VertexID > vertices)
	Sets multiple mesh tetrahedra from vertex IDs.

Data Access
void	readData (std::string_view meshName, std::string_view dataName, ::precice::span< const VertexID > vertices, double relativeReadTime, ::precice::span< double > values) const
	Reads data values from a mesh. Values correspond to a given point in time relative to the beginning of the current timestep.

void	writeData (std::string_view meshName, std::string_view dataName, ::precice::span< const VertexID > vertices, ::precice::span< const double > values)
	Writes data to a mesh.

void	writeGradientData (std::string_view meshName, std::string_view dataName, ::precice::span< const VertexID > vertices, ::precice::span< const double > gradients)
	Writes vector gradient data to a mesh.

Direct Access
void	setMeshAccessRegion (std::string_view meshName, ::precice::span< const double > boundingBox) const
	setMeshAccessRegion Define a region of interest on a received mesh (<receive-mesh ... from="otherParticipant />") in order to receive only a certain mesh region. Have a look at the website under https://precice.org/couple-your-code-direct-access.html or navigate manually to the page Docs->Couple your code -> Advanced topics -> Accessing received meshes directly for a comprehensive documentation

void	getMeshVertexIDsAndCoordinates (std::string_view meshName, ::precice::span< VertexID > ids, ::precice::span< double > coordinates) const
	getMeshVertexIDsAndCoordinates Iterates over the region of interest defined by bounding boxes and reads the corresponding coordinates omitting the mapping.

Private Types
enum struct	State { Constructed , Initialized , Finalized }
	Represents the various states a Participant can be in. More...

enum class	CloseChannels : bool { All = false , Distributed = true }
	Which channels to close in closeCommunicationChannels() More...

Private Member Functions
void	configure (std::string_view configurationFileName)
	Configures the coupling interface from the given xml file.

void	configure (const config::Configuration &configuration)
	Configures the coupling interface with a prepared configuration.

void	configureM2Ns (const m2n::M2NConfiguration::SharedPointer &config)

void	handleExports ()
	Exports meshes with data and watch point data.

void	configurePartitions (const m2n::M2NConfiguration::SharedPointer &m2nConfig)
	Determines participants providing meshes to other participants.

void	compareBoundingBoxes ()
	Communicate bounding boxes and look for overlaps.

void	computePartitions ()
	Communicate meshes and create partitions.

void	computeMappings (std::vector< MappingContext > &contexts, const std::string &mappingType)
	Helper for mapWrittenData and mapReadData.

void	mapInitialWrittenData ()
	Computes, and performs write mappings of the initial data in initialize.

void	mapWrittenData (std::optional< double > after=std::nullopt)
	Computes, and performs suitable write mappings either entirely or after given time.

void	mapInitialReadData ()

void	mapReadData ()

void	trimReadMappedData (double timeAfterAdvance, bool isTimeWindowComplete, const cplscheme::ImplicitData &fromData)
	Removes samples in mapped to data connected to received data via a mapping.

void	performDataActions (const std::set< action::Action::Timing > &timings)
	Performs all data actions with given timing.

void	resetWrittenData ()
	Resets written data.

impl::PtrParticipant	determineAccessingParticipant (const config::Configuration &config)
	Determines participant accessing this interface from the configuration.

void	initializeIntraCommunication ()
	Initializes intra-participant communication.

void	advanceCouplingScheme ()
	Advances the coupling schemes.

void	syncTimestep (double computedTimeStepSize)
	Syncs the time step size between all ranks (all time steps sizes should be the same!)

void	closeCommunicationChannels (CloseChannels cc)
	Syncs the primary ranks of all connected participants.

void	handleDataBeforeAdvance (bool reachedTimeWindowEnd, double timeSteppedTo)
	Completes everything data-related between adding time to and advancing the coupling scheme.

void	handleDataAfterAdvance (bool reachedTimeWindowEnd, bool isTimeWindowComplete, double timeSteppedTo, double timeAfterAdvance, const cplscheme::ImplicitData &receivedData)
	Completes everything data-related after advancing the coupling scheme.

void	samplizeWriteData (double time)
	Creates a Stample at the given time for each write Data and zeros the buffers.

void	trimOldDataBefore (double time)
	Discards data before the given time for all meshes and data known by this participant.

void	trimSendDataAfter (double time)
	Discards send (currently write) data of a participant after a given time when another iteration is required.

Private Attributes
logging::Logger	_log {"impl::ParticipantImpl"}

std::string	_accessorName

int	_accessorProcessRank

int	_accessorCommunicatorSize

impl::PtrParticipant	_accessor

int	_dimensions = 0
	Spatial dimensions of problem.

utils::MultiLock< std::string >	_meshLock

std::map< std::string, int >	_meshIDs
	mesh name to mesh ID mapping.

std::map< std::string, m2n::BoundM2N >	_m2ns

std::vector< impl::PtrParticipant >	_participants
	Holds information about solvers participating in the coupled simulation.

cplscheme::PtrCouplingScheme	_couplingScheme

bool	_allowsExperimental = false
	Are experimental API calls allowed?

bool	_waitInFinalize = false
	Are participants waiting for each other in finalize?

bool	_accessRegionDefined = false
	setMeshAccessRegion may only be called once

State	_state {State::Constructed}
	The current State of the Participant.

long int	_numberAdvanceCalls = 0
	Counts calls to advance for plotting.

int	_executedWriteMappings = 0
	Counts the amount of samples mapped in write mappings executed in the latest advance.

int	_executedReadMappings = 0
	Counts the amount of samples mapped in read mappings executed in the latest advance.

std::unique_ptr< profiling::Event >	_solverInitEvent

std::unique_ptr< profiling::Event >	_solverAdvanceEvent

Friends
struct	Integration::Serial::Whitebox::TestConfigurationPeano
	To allow white box tests.

struct	Integration::Serial::Whitebox::TestConfigurationComsol

Detailed Description

Implementation of Participant. See also pimpl ideom (https://en.cppreference.com/w/cpp/language/pimpl).

Definition at line 56 of file ParticipantImpl.hpp.

Member Enumeration Documentation

◆ CloseChannels

enum class precice::impl::ParticipantImpl::CloseChannels : bool

strongprivate

Which channels to close in closeCommunicationChannels()

Enumerator
All
Distributed

Definition at line 427 of file ParticipantImpl.hpp.

◆ State

enum struct precice::impl::ParticipantImpl::State

strongprivate

Represents the various states a Participant can be in.

Enumerator
Constructed
Initialized
Finalized

Definition at line 316 of file ParticipantImpl.hpp.

Constructor & Destructor Documentation

◆ ParticipantImpl() [1/3]

precice::impl::ParticipantImpl::ParticipantImpl	(	std::string_view	participantName,
		std::string_view	configurationFileName,
		int	solverProcessIndex,
		int	solverProcessSize,
		std::optional< void * >	communicator )

Generic constructor for ParticipantImpl.

Use the parameter communicator to specify a custom global MPI communicator. Pass std::nullopt to signal preCICE to use MPI_COMM_WORLD.

Parameters

[in]	participantName	Name of the participant using the interface. Has to match the name given for a participant in the xml configuration file.
[in]	configurationFileName	Name (with path) of the xml configuration file.
[in]	solverProcessIndex	If the solver code runs with several processes, each process using preCICE has to specify its index, which has to start from 0 and end with solverProcessSize - 1.
[in]	solverProcessSize	The number of solver processes using preCICE.
[in]	communicator	An optional pointer to an MPI_Comm to use as communicator.

Definition at line 79 of file ParticipantImpl.cpp.

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◆ ~ParticipantImpl()

precice::impl::ParticipantImpl::~ParticipantImpl ( )

Destructor.

Ensures that finalize() has been called.

See also: finalize

Definition at line 160 of file ParticipantImpl.cpp.

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◆ ParticipantImpl() [2/3]

precice::impl::ParticipantImpl::ParticipantImpl ( ParticipantImpl const & )

delete

Disable copy construction.

◆ ParticipantImpl() [3/3]

precice::impl::ParticipantImpl::ParticipantImpl ( ParticipantImpl && )

delete

Disable move construction.

Member Function Documentation

◆ advance()

void precice::impl::ParticipantImpl::advance ( double computedTimeStepSize )

Advances preCICE after the solver has computed one time step.

There are two cases to distinguish at this point. If computedTimeStepSize == getMaxTimeStepSize(), then the solver has reached the end of a time window and proceeds the coupling. This call is a computationally expensive process as it involves among other tasks:

Sending and resetting coupling data written by solver to coupling partners.
Receiving coupling data read by solver.
Computing and applying data mappings.
Computing convergence measures in implicit coupling schemes.
Computing acceleration of coupling data.
Exchanging and computing information regarding the state of the coupled simulation.

If computedTimeStepSize < getMaxTimeStepSize(), then the solver hasn't reached the end of a time window and it is subcycling. Depending on the configuration, written data can be used by preCICE to generate additional samples allowing for time interpolation using readData(). This call is computationally inexpensive.

Parameters

[in] computedTimeStepSize Size of time step used by the solver.

Attention: All ranks of participants running in parallel must pass the same computedTimeStep to advance().

See also: getMaxTimeStepSize to get the maximum allowed value for computedTimeStepSize.

Precondition: initialize() has been called successfully.; The solver has computed one time step.; The solver has written all coupling data.; isCouplingOngoing() returns true.; finalize() has not yet been called.

Postcondition: Coupling data values specified in the configuration are exchanged.; Coupling scheme state (computed time, computed time steps, ...) is updated.; The coupling state is logged.; Configured data mapping schemes are applied.; [Second Participant] Configured acceleration schemes are applied.; Meshes with data are exported to files if configured.

Definition at line 347 of file ParticipantImpl.cpp.

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◆ advanceCouplingScheme()

void precice::impl::ParticipantImpl::advanceCouplingScheme ( )

private

Advances the coupling schemes.

Definition at line 1544 of file ParticipantImpl.cpp.

◆ closeCommunicationChannels()

void precice::impl::ParticipantImpl::closeCommunicationChannels ( CloseChannels cc )

private

Syncs the primary ranks of all connected participants.

Definition at line 1557 of file ParticipantImpl.cpp.

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◆ compareBoundingBoxes()

void precice::impl::ParticipantImpl::compareBoundingBoxes ( )

private

Communicate bounding boxes and look for overlaps.

Definition at line 1315 of file ParticipantImpl.cpp.

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◆ computeMappings()

void precice::impl::ParticipantImpl::computeMappings	(	std::vector< MappingContext > &	contexts,
		const std::string &	mappingType )

private

Helper for mapWrittenData and mapReadData.

Definition at line 1388 of file ParticipantImpl.cpp.

◆ computePartitions()

void precice::impl::ParticipantImpl::computePartitions ( )

private

Communicate meshes and create partitions.

Definition at line 1335 of file ParticipantImpl.cpp.

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◆ configure() [1/2]

void precice::impl::ParticipantImpl::configure ( const config::Configuration & configuration )

private

Configures the coupling interface with a prepared configuration.

Can be used to configure the ParticipantImpl without xml file. Requires to manually setup the configuration object.

◆ configure() [2/2]

void precice::impl::ParticipantImpl::configure ( std::string_view configurationFileName )

private

Configures the coupling interface from the given xml file.

Only after the configuration a reasonable state of a ParticipantImpl object is achieved.

Parameters

[in] configurationFileName Name (with path) of the xml config. file.

Definition at line 168 of file ParticipantImpl.cpp.

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◆ configureM2Ns()

void precice::impl::ParticipantImpl::configureM2Ns ( const m2n::M2NConfiguration::SharedPointer & config )

private

Definition at line 1227 of file ParticipantImpl.cpp.

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◆ configurePartitions()

void precice::impl::ParticipantImpl::configurePartitions ( const m2n::M2NConfiguration::SharedPointer & m2nConfig )

private

Determines participants providing meshes to other participants.

Definition at line 1265 of file ParticipantImpl.cpp.

◆ determineAccessingParticipant()

PtrParticipant precice::impl::ParticipantImpl::determineAccessingParticipant ( const config::Configuration & config )

private

Determines participant accessing this interface from the configuration.

Definition at line 1501 of file ParticipantImpl.cpp.

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◆ finalize()

void precice::impl::ParticipantImpl::finalize ( )

Finalizes preCICE.

If initialize() has been called:

Synchronizes with remote participants
handles final exports
cleans up general state

Always:

flushes and finalizes Events
finalizes managed PETSc
finalizes managed MPI

Precondition: finalize() has not been called.

Postcondition: Communication channels are closed.; Meshes and data are deallocated; Finalized managed PETSc; Finalized managed MPI

See also: isCouplingOngoing()

Definition at line 483 of file ParticipantImpl.cpp.

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◆ getDataDimensions()

int precice::impl::ParticipantImpl::getDataDimensions	(	std::string_view	meshName,
		std::string_view	dataName ) const

Returns the spatial dimensionality of the given data on the given mesh.

Note that vectorial data dimensionality directly depends on the spacial dimensionality of the mesh.

Parameters

[in]	meshName	the name of the associated mesh
[in]	dataName	the name of the data to get the dimensions for

Returns: the dimensions of the given Data

See also: getMeshDimensions

Definition at line 535 of file ParticipantImpl.cpp.

◆ getMaxTimeStepSize()

double precice::impl::ParticipantImpl::getMaxTimeStepSize ( ) const

Get the maximum allowed time step size of the current window.

Returns: Maximum size of time step to be computed by solver.

Allows the user to query the maximum allowed time step size in the current window. This should be used to compute the actual time step that the solver uses.

Precondition: initialize() has been called successfully.

Definition at line 559 of file ParticipantImpl.cpp.

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◆ getMeshDimensions()

int precice::impl::ParticipantImpl::getMeshDimensions ( std::string_view meshName ) const

Returns the spatial dimensionality of the given mesh.

Parameters

[in] meshName the name of the associated mesh

Returns: the dimensions of the given mesh

Definition at line 528 of file ParticipantImpl.cpp.

◆ getMeshVertexIDsAndCoordinates()

void precice::impl::ParticipantImpl::getMeshVertexIDsAndCoordinates	(	std::string_view	meshName,
		::precice::span< VertexID >	ids,
		::precice::span< double >	coordinates ) const

getMeshVertexIDsAndCoordinates Iterates over the region of interest defined by bounding boxes and reads the corresponding coordinates omitting the mapping.

Parameters

[in]	meshName	corresponding mesh name
[out]	ids	ids corresponding to the coordinates
[out]	coordinates	the coordinates associated to the `ids` and corresponding data values

Precondition: ids.size() == getMeshVertexSize(meshName); coordinates.size() == getMeshVertexSize(meshName) * getMeshDimensions(meshName); This function can be called on received meshes as well as provided meshes. However, you need to call this function after initialize(), if the meshName corresponds to a received mesh, since the relevant mesh data is exchanged during the initialize() call.

See also: getMeshVertexSize() to get the amount of vertices in the mesh; getMeshDimensions() to get the spacial dimensionality of the mesh

Definition at line 1181 of file ParticipantImpl.cpp.

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◆ getMeshVertexSize()

int precice::impl::ParticipantImpl::getMeshVertexSize ( std::string_view meshName ) const

Returns the number of vertices of a mesh.

Parameters

[in] meshName the name of the mesh

Returns: the amount of the vertices of the mesh

Precondition: This function can be called on received meshes as well as provided meshes. However, you need to call this function after initialize(), if the meshName corresponds to a received mesh, since the relevant mesh data is exchanged during the initialize() call.

Definition at line 628 of file ParticipantImpl.cpp.

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◆ handleDataAfterAdvance()

void precice::impl::ParticipantImpl::handleDataAfterAdvance	(	bool	reachedTimeWindowEnd,
		bool	isTimeWindowComplete,
		double	timeSteppedTo,
		double	timeAfterAdvance,
		const cplscheme::ImplicitData &	receivedData )

private

Completes everything data-related after advancing the coupling scheme.

Definition at line 420 of file ParticipantImpl.cpp.

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◆ handleDataBeforeAdvance()

void precice::impl::ParticipantImpl::handleDataBeforeAdvance	(	bool	reachedTimeWindowEnd,
		double	timeSteppedTo )

private

Completes everything data-related between adding time to and advancing the coupling scheme.

Definition at line 403 of file ParticipantImpl.cpp.

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◆ handleExports()

void precice::impl::ParticipantImpl::handleExports ( )

private

Exports meshes with data and watch point data.

Definition at line 1481 of file ParticipantImpl.cpp.

◆ initialize()

void precice::impl::ParticipantImpl::initialize ( )

Fully initializes preCICE and coupling data.

- Sets up a connection to the other participants of the coupled simulation.

Pre-processes defined meshes and handles partitions in parallel.
Receives first coupling data. The starting values for coupling data are zero by default.
Determines maximum allowed size of the first time step to be computed.

Precondition: initialize() has not yet been called.

Postcondition: Parallel communication to the coupling partner(s) is setup.; Meshes are exchanged between coupling partners and the parallel partitions are created.; Initial coupling data was exchanged.

See also: getMaxTimeStepSize(); requiresInitialData()

Definition at line 242 of file ParticipantImpl.cpp.

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◆ initializeIntraCommunication()

void precice::impl::ParticipantImpl::initializeIntraCommunication ( )

private

Initializes intra-participant communication.

Definition at line 1516 of file ParticipantImpl.cpp.

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◆ isCouplingOngoing()

bool precice::impl::ParticipantImpl::isCouplingOngoing ( ) const

Checks if the coupled simulation is still ongoing.

Returns: whether the coupling is ongoing.

A coupling is ongoing as long as

the maximum number of time windows has not been reached, and
the final time has not been reached.

Precondition: initialize() has been called successfully.

See also: advance()

Note: The user should call finalize() after this function returns false.

Definition at line 543 of file ParticipantImpl.cpp.

◆ isTimeWindowComplete()

bool precice::impl::ParticipantImpl::isTimeWindowComplete ( ) const

Checks if the current coupling window is completed.

Returns: whether the current time window is complete.

The following reasons require several solver time steps per time window:

A solver chooses to perform subcycling, i.e. using a smaller timestep than the time window.
An implicit coupling iteration is not yet converged.

Hence, a time window is complete if we reach the end of the time window and the implicit coupling has converged.

For implicit coupling this condition is equivalent with the requirement to write an iteration checkpoint. This is, however, not the case for explicit coupling.

Precondition: initialize() has been called successfully.

Definition at line 551 of file ParticipantImpl.cpp.

◆ mapInitialReadData()

void precice::impl::ParticipantImpl::mapInitialReadData ( )

private

Definition at line 1445 of file ParticipantImpl.cpp.

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◆ mapInitialWrittenData()

void precice::impl::ParticipantImpl::mapInitialWrittenData ( )

private

Computes, and performs write mappings of the initial data in initialize.

Definition at line 1404 of file ParticipantImpl.cpp.

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◆ mappedSamples()

ParticipantImpl::MappedSamples precice::impl::ParticipantImpl::mappedSamples ( ) const

Returns the amount of mapped read and write samples in the last call to advance.

Definition at line 1598 of file ParticipantImpl.cpp.

◆ mapReadData()

void precice::impl::ParticipantImpl::mapReadData ( )

private

Definition at line 1458 of file ParticipantImpl.cpp.

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◆ mapWrittenData()

void precice::impl::ParticipantImpl::mapWrittenData ( std::optional< double > after = std::nullopt )

private

Computes, and performs suitable write mappings either entirely or after given time.

Definition at line 1416 of file ParticipantImpl.cpp.

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◆ mesh()

const mesh::Mesh & precice::impl::ParticipantImpl::mesh ( const std::string & meshName ) const

Allows to access a registered mesh.

Todo: try to remove or make private. See https://github.com/precice/precice/issues/1269

Definition at line 1592 of file ParticipantImpl.cpp.

◆ operator=() [1/2]

ParticipantImpl & precice::impl::ParticipantImpl::operator= ( ParticipantImpl && )

delete

Disable move assignment.

◆ operator=() [2/2]

ParticipantImpl & precice::impl::ParticipantImpl::operator= ( ParticipantImpl const & )

delete

Disable assignment construction.

◆ performDataActions()

void precice::impl::ParticipantImpl::performDataActions ( const std::set< action::Action::Timing > & timings )

private

Performs all data actions with given timing.

Parameters

[in] timings the timings of the action.

Definition at line 1471 of file ParticipantImpl.cpp.

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◆ readData()

void precice::impl::ParticipantImpl::readData	(	std::string_view	meshName,
		std::string_view	dataName,
		::precice::span< const VertexID >	vertices,
		double	relativeReadTime,
		::precice::span< double >	values ) const

Reads data values from a mesh. Values correspond to a given point in time relative to the beginning of the current timestep.

This function reads values of specified vertices from data of a mesh. Values are read into a block of continuous memory defined by values in the order specified by vertices.

The 1D/Scalar-format of values is (d0, d1, ..., dn) The 2D-format of values is (d0x, d0y, d1x, d1y, ..., dnx, dny) The 3D-format of values is (d0x, d0y, d0z, d1x, d1y, d1z, ..., dnx, dny, dnz)

The data is read at relativeReadTime, which indicates the point in time measured from the beginning of the current time step. relativeReadTime = 0 corresponds to data at the beginning of the time step. Assuming that the user will call advance(dt) at the end of the time step, dt indicates the size of the current time step. Then relativeReadTime = dt corresponds to the data at the end of the time step.

Parameters

[in]	meshName	the name of mesh that hold the data.
[in]	dataName	the name of the data to read from.
[in]	ids	the vertex ids of the vertices to read data from.
[in]	relativeReadTime	Point in time where data is read relative to the beginning of the current time step.
[out]	values	the destination memory to read the data from.

Precondition: every VertexID in ids is a return value of setMeshVertex or setMeshVertices; values.size() == getDataDimensions(meshName, dataName) * ids.size()

Postcondition: values contain the read data as specified in the above format.

See also: Participant::setMeshVertex(); Participant::setMeshVertices(); Participant::getDataDimensions()

Definition at line 1057 of file ParticipantImpl.cpp.

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◆ requiresGradientDataFor()

bool precice::impl::ParticipantImpl::requiresGradientDataFor	(	std::string_view	meshName,
		std::string_view	dataName ) const

Checks if the given data set requires gradient data. We check if the data object has been initialized with the gradient flag.

Attention: This API function is experimental and may change in the future!

preCICE may require gradient data information from the solver and ignores any API calls regarding gradient data if it is not required. (When applying a nearest-neighbor-gradient mapping)

Parameters

[in]	meshName	the name of mesh that hold the data.
[in]	dataName	the name of the data.

Returns: whether gradient is required

Definition at line 616 of file ParticipantImpl.cpp.

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◆ requiresInitialData()

bool precice::impl::ParticipantImpl::requiresInitialData ( )

Checks if the participant is required to provide initial data.

If true, then the participant needs to write initial data to defined vertices prior to calling initialize().

Note: If initial data is configured, then this function needs to be called.

Precondition: initialize() has not yet been called

Definition at line 576 of file ParticipantImpl.cpp.

◆ requiresMeshConnectivityFor()

bool precice::impl::ParticipantImpl::requiresMeshConnectivityFor ( std::string_view meshName ) const

Checks if the given mesh requires connectivity.

preCICE may require connectivity information from the solver and ignores any API calls regarding connectivity if it is not required. Use this function to conditionally generate this connectivity.

Parameters

[in] meshName the name of the mesh

Returns: whether connectivity is required

Definition at line 609 of file ParticipantImpl.cpp.

◆ requiresReadingCheckpoint()

bool precice::impl::ParticipantImpl::requiresReadingCheckpoint ( )

Checks if the participant is required to read an iteration checkpoint.

If true, the participant is required to read an iteration checkpoint before calling advance().

Note: If implicit coupling is configured for this Participant, then this function needs to be called.; This function returns false before the first call to advance().

Precondition: initialize() has been called

See also: requiresWritingCheckpoint()

Definition at line 598 of file ParticipantImpl.cpp.

◆ requiresWritingCheckpoint()

bool precice::impl::ParticipantImpl::requiresWritingCheckpoint ( )

Checks if the participant is required to write an iteration checkpoint.

If true, the participant is required to write an iteration checkpoint before calling advance().

Note: If implicit coupling is configured for this Participant, then this function needs to be called.

Precondition: initialize() has been called

See also: requiresReadingCheckpoint()

Definition at line 587 of file ParticipantImpl.cpp.

◆ resetMesh()

void precice::impl::ParticipantImpl::resetMesh ( std::string_view meshName )

Todo: Currently not supported as we would need to re-compute the re-partition

Definition at line 644 of file ParticipantImpl.cpp.

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◆ resetWrittenData()

void precice::impl::ParticipantImpl::resetWrittenData ( )

private

Resets written data.

Parameters

isAtWindowEnd	set true, if function is called at end of window to also trim the time sample storage
isTimeWindowComplete	set true, if function is called at end of converged window to trim and move the sample storage.

Definition at line 1493 of file ParticipantImpl.cpp.

◆ samplizeWriteData()

void precice::impl::ParticipantImpl::samplizeWriteData ( double time )

private

Creates a Stample at the given time for each write Data and zeros the buffers.

Definition at line 459 of file ParticipantImpl.cpp.

◆ setMeshAccessRegion()

void precice::impl::ParticipantImpl::setMeshAccessRegion	(	std::string_view	meshName,
		::precice::span< const double >	boundingBox ) const

setMeshAccessRegion Define a region of interest on a received mesh (<receive-mesh ... from="otherParticipant />") in order to receive only a certain mesh region. Have a look at the website under https://precice.org/couple-your-code-direct-access.html or navigate manually to the page Docs->Couple your code -> Advanced topics -> Accessing received meshes directly for a comprehensive documentation

This function is required if you don't want to use the mapping schemes in preCICE, but rather want to use your own solver for data mapping. As opposed to the usual preCICE mapping, only a single mesh (from the other participant) is now involved in this situation since an 'own' mesh defined by the participant itself is not required any more. In order to re-partition the received mesh, the participant needs to define the mesh region it wants read data from and write data to. The mesh region is specified through an axis-aligned bounding box given by the lower and upper [min and max] bounding-box limits in each space dimension [x, y, z].

Note: Defining a bounding box for serial runs of the solver (not to be confused with serial coupling mode) is valid. However, a warning is raised in case vertices are filtered out completely on the receiving side, since the associated data values of the filtered vertices are filled with zero data.; This function can only be called once per participant and rank and trying to call it more than once results in an error.; If you combine the direct access with a mpping (say you want to read data from a defined mesh, as usual, but you want to directly access and write data on a received mesh without a mapping) you may not need this function at all since the region of interest is already defined through the defined mesh used for data reading. This is the case if you define any mapping involving the directly accessed mesh on the receiving participant. (In parallel, only the cases read-consistent and write-conservative are relevant, as usual).; The safety factor scaling (see safety-factor in the configuration file) is not applied to the defined access region and a specified safety will be ignored in case there is no additional mapping involved. However, in case a mapping is in addition to the direct access involved, you will receive (and gain access to) vertices inside the defined access region plus vertices inside the safety factor region resulting from the mapping. The default value of the safety factor is 0.5,i.e., the defined access region as computed through the involved provided mesh is by 50% enlarged.

Parameters

[in]	meshName	name of the mesh you want to access through the bounding box
[in]	boundingBox	Axis aligned bounding boxes which has in 3D the format [x_min, x_max, y_min, y_max, z_min, z_max]

Precondition: initialize() has not yet been called.; boundingBox.size() == 2 * getMeshDimensions(meshName)

Definition at line 1144 of file ParticipantImpl.cpp.

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◆ setMeshEdge()

void precice::impl::ParticipantImpl::setMeshEdge	(	std::string_view	meshName,
		VertexID	first,
		VertexID	second )

Sets a mesh edge from vertex IDs.

Ignored if preCICE doesn't require connectivity for the mesh.

Note: The order of vertices does not matter.

Parameters

[in]	meshName	name of the mesh to add the edge to
[in]	first	ID of the first vertex of the edge
[in]	second	ID of the second vertex of the edge

Precondition: vertices with IDs first and second were added to the mesh with the name meshName

Definition at line 712 of file ParticipantImpl.cpp.

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◆ setMeshEdges()

void precice::impl::ParticipantImpl::setMeshEdges	(	std::string_view	meshName,
		::precice::span< const VertexID >	vertices )

Sets multiple mesh edges from vertex IDs.

vertices contain pairs of vertex indices for each edge to define. The format follows: e1a, e1b, e2a, e2b, ... Ignored if preCICE doesn't require connectivity for the mesh.

Note: The order of vertices per edge does not matter.

Parameters

[in]	meshName	the name of the mesh to add the n edges to
[in]	ids	an array containing 2n vertex IDs for n edges

Precondition: vertices in ids were added to the mesh with the name meshName; ids.size() is multiple of 2

See also: requiresMeshConnectivityFor()

Definition at line 731 of file ParticipantImpl.cpp.

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◆ setMeshQuad()

void precice::impl::ParticipantImpl::setMeshQuad	(	std::string_view	meshName,
		VertexID	first,
		VertexID	second,
		VertexID	third,
		VertexID	fourth )

Sets a planar surface mesh quadrangle from vertex IDs.

The planar quad will be triangulated, maximizing area-to-circumference. Ignored if preCICE doesn't require connectivity for the mesh.

Warning: The order of vertices does not matter, however, only planar quads are allowed.

Parameters

[in]	meshName	name of the mesh to add the Quad to
[in]	first	ID of the first vertex of the Quad
[in]	second	ID of the second vertex of the Quad
[in]	third	ID of the third vertex of the Quad
[in]	fourth	ID of the fourth vertex of the Quad

Precondition: vertices with IDs first, second, third, and fourth were added to the mesh with the name meshName

See also: requiresMeshConnectivityFor()

Definition at line 839 of file ParticipantImpl.cpp.

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◆ setMeshQuads()

void precice::impl::ParticipantImpl::setMeshQuads	(	std::string_view	meshName,
		::precice::span< const VertexID >	vertices )

Sets multiple mesh quads from vertex IDs.

vertices contain quadruples of vertex indices for each quad to define. The format follows: q1a, q1b, q1c, q1d, q2a, q2b, q2c, q2d, ...

Each planar quad will be triangulated, maximizing area-to-circumference. Ignored if preCICE doesn't require connectivity for the mesh.

Warning: The order of vertices per quad does not matter, however, only planar quads are allowed.

Parameters

[in]	meshName	name of the mesh to add the n quads to
[in]	ids	an array containing 4n vertex IDs for n quads

Precondition: vertices in ids were added to the mesh with the name meshName; ids.size() is multiple of 4

See also: requiresMeshConnectivityFor()

Definition at line 891 of file ParticipantImpl.cpp.

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◆ setMeshTetrahedra()

void precice::impl::ParticipantImpl::setMeshTetrahedra	(	std::string_view	meshName,
		::precice::span< const VertexID >	vertices )

Sets multiple mesh tetrahedra from vertex IDs.

vertices contain quadruples of vertex indices for each tetrahedron to define. The format follows: t1a, t1b, t1c, t1d, t2a, t2b, t2c, t2d, ... Ignored if preCICE doesn't require connectivity for the mesh.

Note: The order of vertices per tetrahedron does not matter.

Parameters

[in]	meshName	name of the mesh to add the n tetrahedra to
[in]	ids	an array containing 4n vertex IDs for n tetrahedra

Precondition: vertices in ids were added to the mesh with the name meshName; ids.size() is multiple of 4

See also: requiresMeshConnectivityFor()

Definition at line 982 of file ParticipantImpl.cpp.

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◆ setMeshTetrahedron()

void precice::impl::ParticipantImpl::setMeshTetrahedron	(	std::string_view	meshName,
		VertexID	first,
		VertexID	second,
		VertexID	third,
		VertexID	fourth )

Set tetrahedron in 3D mesh from vertex ID.

Note: The order of vertices does not matter.

Parameters

[in]	meshName	name of the mesh to add the Tetrahedron to
[in]	first	ID of the first vertex of the Tetrahedron
[in]	second	ID of the second vertex of the Tetrahedron
[in]	third	ID of the third vertex of the Tetrahedron
[in]	fourth	ID of the fourth vertex of the Tetrahedron

Precondition: vertices with IDs first, second, third, and fourth were added to the mesh with the name meshName

See also: requiresMeshConnectivityFor()

Definition at line 954 of file ParticipantImpl.cpp.

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◆ setMeshTriangle()

void precice::impl::ParticipantImpl::setMeshTriangle	(	std::string_view	meshName,
		VertexID	first,
		VertexID	second,
		VertexID	third )

Sets mesh triangle from vertex IDs.

Note: The order of vertices does not matter.

Parameters

[in]	meshName	name of the mesh to add the triangle to
[in]	first	ID of the first vertex of the triangle
[in]	second	ID of the second vertex of the triangle
[in]	third	ID of the third vertex of the triangle

Precondition: vertices with IDs first, second, and third were added to the mesh with the name meshName

See also: requiresMeshConnectivityFor()

Definition at line 765 of file ParticipantImpl.cpp.

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◆ setMeshTriangles()

void precice::impl::ParticipantImpl::setMeshTriangles	(	std::string_view	meshName,
		::precice::span< const VertexID >	vertices )

Sets multiple mesh triangles from vertex IDs.

vertices contain triples of vertex indices for each triangle to define. The format follows: t1a, t1b, t1c, t2a, t2b, t2c, ... Ignored if preCICE doesn't require connectivity for the mesh.

Note: The order of vertices per triangle does not matter.

Parameters

[in]	meshName	name of the mesh to add the n triangles to
[in]	ids	an array containing 3n vertex IDs for n triangles

Precondition: vertices in ids were added to the mesh with the name meshName; ids.size() is multiple of 3

See also: requiresMeshConnectivityFor()

Definition at line 802 of file ParticipantImpl.cpp.

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◆ setMeshVertex()

VertexID precice::impl::ParticipantImpl::setMeshVertex	(	std::string_view	meshName,
		::precice::span< const double >	position )

Creates a mesh vertex.

Parameters

[in]	meshName	the name of the mesh to add the vertex to.
[in]	position	the coordinates of the vertex.

Returns: the id of the created vertex

Precondition: initialize() has not yet been called; position.size() == getMeshDimensions(meshName)

See also: getMeshDimensions()

Definition at line 657 of file ParticipantImpl.cpp.

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◆ setMeshVertices()

void precice::impl::ParticipantImpl::setMeshVertices	(	std::string_view	meshName,
		::precice::span< const double >	positions,
		::precice::span< VertexID >	ids )

Creates multiple mesh vertices.

Parameters

[in]	meshName	the name of the mesh to add the vertices to.
[in]	coordinates	a span to the coordinates of the vertices The 2D-format is (d0x, d0y, d1x, d1y, ..., dnx, dny) The 3D-format is (d0x, d0y, d0z, d1x, d1y, d1z, ..., dnx, dny, dnz)
[out]	ids	The ids of the created vertices

Precondition: initialize() has not yet been called; coordinates.size() == getMeshDimensions(meshName) * ids.size()

See also: getDimensions()

Definition at line 680 of file ParticipantImpl.cpp.

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◆ syncTimestep()

void precice::impl::ParticipantImpl::syncTimestep ( double computedTimeStepSize )

private

Syncs the time step size between all ranks (all time steps sizes should be the same!)

Definition at line 1527 of file ParticipantImpl.cpp.

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◆ trimOldDataBefore()

void precice::impl::ParticipantImpl::trimOldDataBefore ( double time )

private

Discards data before the given time for all meshes and data known by this participant.

Definition at line 467 of file ParticipantImpl.cpp.

◆ trimReadMappedData()

void precice::impl::ParticipantImpl::trimReadMappedData	(	double	timeAfterAdvance,
		bool	isTimeWindowComplete,
		const cplscheme::ImplicitData &	fromData )

private

Removes samples in mapped to data connected to received data via a mapping.

This prevents old samples from blocking remappings.

Definition at line 1428 of file ParticipantImpl.cpp.

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◆ trimSendDataAfter()

void precice::impl::ParticipantImpl::trimSendDataAfter ( double time )

private

Discards send (currently write) data of a participant after a given time when another iteration is required.

Definition at line 476 of file ParticipantImpl.cpp.

◆ writeData()

void precice::impl::ParticipantImpl::writeData	(	std::string_view	meshName,
		std::string_view	dataName,
		::precice::span< const VertexID >	vertices,
		::precice::span< const double >	values )

Writes data to a mesh.

This function writes values of specified vertices to data of a mesh. Values are provided as a block of continuous memory defined by values. The order of the provided data follows the order specified by vertices.

The 1D/Scalar-format of values is (d0, d1, ..., dn) The 2D-format of values is (d0x, d0y, d1x, d1y, ..., dnx, dny) The 3D-format of values is (d0x, d0y, d0z, d1x, d1y, d1z, ..., dnx, dny, dnz)

Parameters

[in]	meshName	the name of mesh that hold the data.
[in]	dataName	the name of the data to write to.
[in]	ids	the vertex ids of the vertices to write data to.
[in]	values	the values to write to preCICE.

Precondition: every VertexID in ids is a return value of setMeshVertex or setMeshVertices; values.size() == getDataDimensions(meshName, dataName) * ids.size()

See also: Participant::setMeshVertex(); Participant::setMeshVertices(); Participant::getDataDimensions()

Definition at line 1021 of file ParticipantImpl.cpp.

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◆ writeGradientData()

void precice::impl::ParticipantImpl::writeGradientData	(	std::string_view	meshName,
		std::string_view	dataName,
		::precice::span< const VertexID >	vertices,
		::precice::span< const double >	gradients )

Writes vector gradient data to a mesh.

Attention: This API function is experimental and may change in the future!

This function writes gradient values of specified vertices to data of a mesh. Values are provided as a block of continuous memory defined by gradients. The order of the provided gradient data follows the order specified by vertices.

Each gradient or Jacobian depends on the dimensionality of the mesh and data. Each gradient has a total of getMeshDimensions(meshName) * getDataDimensions(meshName, dataName) components and is stored in a linearised format as follows:

Spatial Dimensions	Scalar Data	Vectorial Data
2D	s dx, s dy	x dx, y dx, x dy, y dy
3D	s dy, s dy, s dz	x dx, y dx, z dx, x dy, y dy, z dy, x dz, y dz, z dz

The gradients/Jacobian for all vertices are then contiguously saved in memory.

Example for 2D Vectorial:

Index	0	1	2	3	...	4n	4n+1	4n+2	4n+3
Component	x0 dx	y0 dx	x0 dy	y0 dy	...	xn dx	yn dx	xn dy	yn dy

Parameters

[in]	meshName	the name of mesh that hold the data.
[in]	dataName	the name of the data to write to.
[in]	ids	the vertex ids of the vertices to write gradient data to.
[in]	gradients	the linearised gradient data to write to preCICE.

Precondition: Data has attribute hasGradient = true; every VertexID in vertices is a return value of setMeshVertex or setMeshVertices; gradients.size() == ids.size() * getMeshDimensions(meshName) * getDataDimensions(meshName, dataName)

See also: Participant::setMeshVertex(); Participant::setMeshVertices(); Participant::getMeshDimensions(); Participant::getDataDimensions()

Definition at line 1097 of file ParticipantImpl.cpp.

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Friends And Related Symbol Documentation

◆ Integration::Serial::Whitebox::TestConfigurationComsol

friend struct Integration::Serial::Whitebox::TestConfigurationComsol

friend

Definition at line 452 of file ParticipantImpl.hpp.

◆ Integration::Serial::Whitebox::TestConfigurationPeano

friend struct Integration::Serial::Whitebox::TestConfigurationPeano

friend

To allow white box tests.

Definition at line 451 of file ParticipantImpl.hpp.

Member Data Documentation

◆ _accessor

impl::PtrParticipant precice::impl::ParticipantImpl::_accessor

private

Definition at line 298 of file ParticipantImpl.hpp.

◆ _accessorCommunicatorSize

int precice::impl::ParticipantImpl::_accessorCommunicatorSize

private

Definition at line 296 of file ParticipantImpl.hpp.

◆ _accessorName

std::string precice::impl::ParticipantImpl::_accessorName

private

Definition at line 292 of file ParticipantImpl.hpp.

◆ _accessorProcessRank

int precice::impl::ParticipantImpl::_accessorProcessRank

private

Definition at line 294 of file ParticipantImpl.hpp.

◆ _accessRegionDefined

bool precice::impl::ParticipantImpl::_accessRegionDefined = false

mutableprivate

setMeshAccessRegion may only be called once

Definition at line 329 of file ParticipantImpl.hpp.

◆ _allowsExperimental

bool precice::impl::ParticipantImpl::_allowsExperimental = false

private

Are experimental API calls allowed?

Definition at line 323 of file ParticipantImpl.hpp.

◆ _couplingScheme

cplscheme::PtrCouplingScheme precice::impl::ParticipantImpl::_couplingScheme

private

Definition at line 313 of file ParticipantImpl.hpp.

◆ _dimensions

int precice::impl::ParticipantImpl::_dimensions = 0

private

Spatial dimensions of problem.

Definition at line 301 of file ParticipantImpl.hpp.

◆ _executedReadMappings

int precice::impl::ParticipantImpl::_executedReadMappings = 0

private

Counts the amount of samples mapped in read mappings executed in the latest advance.

Definition at line 341 of file ParticipantImpl.hpp.

◆ _executedWriteMappings

int precice::impl::ParticipantImpl::_executedWriteMappings = 0

private

Counts the amount of samples mapped in write mappings executed in the latest advance.

Definition at line 338 of file ParticipantImpl.hpp.

◆ _log

logging::Logger precice::impl::ParticipantImpl::_log {"impl::ParticipantImpl"}

mutableprivate

Definition at line 290 of file ParticipantImpl.hpp.

◆ _m2ns

std::map<std::string, m2n::BoundM2N> precice::impl::ParticipantImpl::_m2ns

private

Definition at line 308 of file ParticipantImpl.hpp.

◆ _meshIDs

std::map<std::string, int> precice::impl::ParticipantImpl::_meshIDs

private

mesh name to mesh ID mapping.

Definition at line 306 of file ParticipantImpl.hpp.

◆ _meshLock

utils::MultiLock<std::string> precice::impl::ParticipantImpl::_meshLock

private

Definition at line 303 of file ParticipantImpl.hpp.

◆ _numberAdvanceCalls

long int precice::impl::ParticipantImpl::_numberAdvanceCalls = 0

private

Counts calls to advance for plotting.

Definition at line 335 of file ParticipantImpl.hpp.

◆ _participants

std::vector<impl::PtrParticipant> precice::impl::ParticipantImpl::_participants

private

Holds information about solvers participating in the coupled simulation.

Definition at line 311 of file ParticipantImpl.hpp.

◆ _solverAdvanceEvent

std::unique_ptr<profiling::Event> precice::impl::ParticipantImpl::_solverAdvanceEvent

private

Definition at line 455 of file ParticipantImpl.hpp.

◆ _solverInitEvent

std::unique_ptr<profiling::Event> precice::impl::ParticipantImpl::_solverInitEvent

private

Definition at line 454 of file ParticipantImpl.hpp.

◆ _state

State precice::impl::ParticipantImpl::_state {State::Constructed}

private

The current State of the Participant.

Definition at line 332 of file ParticipantImpl.hpp.

◆ _waitInFinalize

bool precice::impl::ParticipantImpl::_waitInFinalize = false

private

Are participants waiting for each other in finalize?

Definition at line 326 of file ParticipantImpl.hpp.

The documentation for this class was generated from the following files:

src/precice/impl/ParticipantImpl.hpp
src/precice/impl/ParticipantImpl.cpp

Classes

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Friends

Detailed Description

Member Enumeration Documentation

◆ CloseChannels

◆ State

Constructor & Destructor Documentation

◆ ParticipantImpl() [1/3]

◆ ~ParticipantImpl()

◆ ParticipantImpl() [2/3]

◆ ParticipantImpl() [3/3]

Member Function Documentation

◆ advance()

◆ advanceCouplingScheme()

◆ closeCommunicationChannels()

◆ compareBoundingBoxes()

◆ computeMappings()

◆ computePartitions()

◆ configure() [1/2]

◆ configure() [2/2]

◆ configureM2Ns()

◆ configurePartitions()

◆ determineAccessingParticipant()

◆ finalize()

◆ getDataDimensions()

◆ getMaxTimeStepSize()

◆ getMeshDimensions()

◆ getMeshVertexIDsAndCoordinates()

◆ getMeshVertexSize()

◆ handleDataAfterAdvance()

◆ handleDataBeforeAdvance()

◆ handleExports()

◆ initialize()

◆ initializeIntraCommunication()

◆ isCouplingOngoing()

◆ isTimeWindowComplete()

◆ mapInitialReadData()

◆ mapInitialWrittenData()

◆ mappedSamples()

◆ mapReadData()

◆ mapWrittenData()

◆ mesh()

◆ operator=() [1/2]

◆ operator=() [2/2]

◆ performDataActions()

◆ readData()

◆ requiresGradientDataFor()

◆ requiresInitialData()

◆ requiresMeshConnectivityFor()

◆ requiresReadingCheckpoint()

◆ requiresWritingCheckpoint()

◆ resetMesh()

◆ resetWrittenData()

◆ samplizeWriteData()

◆ setMeshAccessRegion()

◆ setMeshEdge()

◆ setMeshEdges()

◆ setMeshQuad()

◆ setMeshQuads()

◆ setMeshTetrahedra()

◆ setMeshTetrahedron()

◆ setMeshTriangle()

◆ setMeshTriangles()

◆ setMeshVertex()

◆ setMeshVertices()

◆ syncTimestep()

◆ trimOldDataBefore()

◆ trimReadMappedData()

◆ trimSendDataAfter()

◆ writeData()

◆ writeGradientData()

Friends And Related Symbol Documentation

◆ Integration::Serial::Whitebox::TestConfigurationComsol

◆ Integration::Serial::Whitebox::TestConfigurationPeano

Member Data Documentation

◆ _accessor