dueca::Module Class Reference

Base class for user-created self contained objects in DUECA. More...

#include <Module.hxx>

Inheritance diagram for dueca::Module:

Collaboration diagram for dueca::Module:

Public Member Functions
virtual	~Module ()
	Destructor.
virtual bool	complete ()
	Inform the module that all parameters have now been passed.
virtual bool	isPrepared ()=0
	To check whether the module is ready for work.
virtual bool	isInitialPrepared ()
	To check whether the module is prepared to be prepared.
ObjectType	getObjectType () const
	The object type within DUECA.
virtual void	startModule (const TimeSpec &time)=0
	Start the module's activity (activities)
virtual void	stopModule (const TimeSpec &time)=0
	Stop the module's activity (activities)
virtual void	initialStartModule (const TimeSpec &time)
	Initial start opportunity.
virtual void	finalStopModule (const TimeSpec &time)
	Final stop command.
const Entity *	getMyEntity ()
	Return a pointer to the entity to which this module belongs.
const ModuleState &	getState ()
	Return the module state.
Public Member Functions inherited from dueca::NamedObject
const std::string	getEntity () const
	Returns the "entity" part of the name.
const std::string	getClass () const
	Returns the "class" part of the name.
const std::string	getPart () const
	Returns the sub-entity or "part" part of the name.
const NameSet &	getNameSet () const
	This returns the complete name set.
const GlobalId &	getId () const
	This returns the id.

Protected Member Functions
	Module (const Entity *e, const char *m_class, const char *part)
	Constructor.
virtual void	setSafetyStop ()
	Put a brake on this module's activities.
Protected Member Functions inherited from dueca::NamedObject
	NamedObject (const GlobalId &id)
	Reserve for AssociateObject.
	NamedObject (const NameSet &ns)
	Normal constructor, protected, because it has no use to create a NamedObject by itself.
virtual	~NamedObject ()
	Destructor.

Protected Attributes
ModuleState	state
	Flag to remember whether we are stopped due to some error with hardware device manipulation.

Friends
class	CriticalActivity
class	Entity

Detailed Description

Base class for user-created self contained objects in DUECA.

A Module is a class that basically obeys to some simple DUECA rules (it listens to its Entity), and which can be created from Scheme or Python, one of the scripting languages used in DUECA. Note that for simulations, often the SimulationModule class – derived from Module – is used as a base class for application code.

A Module can register one or more activities, and supply the conditions on which the activities must be invoked. In the activities the module's work is done; simulation, control, data processing, etc.

For certain situations, it is good to know from which thread a module's method is called.

• Modules are created from the main thread of DUECA. This thread handles script (Scheme or Python) interaction, thus the constructor and any methods listed in the ParameterTable are called from this thread. There is access to your data, but not much more at this phase.

• After creation of all initial modules in DUECA, applicable graphics code is initialized. Typically a windowing toolkit like GTK2, gtk3, glut may be started. After that, the Module::complete() method is called. At this stage, windows using the graphics code may be opened.

• Module control is done from the "admin" or priority 0 thread. This thread commonly also does the gtk interface code, if a gtk interface is present. So the startModule, stopModule, initialStartModule and finalStopModule methods are called from this thread.

• It is common for a module to have one or sometimes more activities; the priority for these activities can be freely chosen, and is often configurable. So you should take care when sharing data between these activities and the module control callbacks.

However, module control callbacks are called with a time specification that gives you some lead. In general it is safe to access the module's data, and then set the activity active.

Member Function Documentation

complete()

virtual bool dueca::Module::complete ( )

virtual

Inform the module that all parameters have now been passed.

Override this complete method if you have non-trivial work to do before starting to run. Examples are reading large databases, opening graphic (especially accelerated GL) windows, etc. Return false if something in the parameters is wrong (by the way, it would help if you printed what!)

Returns

True if all initialisation successful

Reimplemented in dueca::GLSweeper, dueca::hdf5log::HDF5Logger, dueca::hdf5log::HDF5Replayer, dueca::ActivityView, dueca::ConfigStorage, dueca::websock::WebSocketsServer< Encoder, Decoder >, and dueca::ActivityViewBase.

isPrepared()

virtual bool dueca::Module::isPrepared ( )

pure virtual

To check whether the module is ready for work.

In this phase, typically check that channel tokens needed for communication are valid. May be called repeatedly.

Returns

True if ready for running

Implemented in dueca::ActivityViewBase, dueca::TimingView, dueca::hdf5log::HDF5Replayer, dueca::ConfigStorage, and dueca::websock::WebSocketsServerBase.

isInitialPrepared()

virtual bool dueca::Module::isInitialPrepared ( )

virtual

To check whether the module is prepared to be prepared.

This method may be overloaded (e.g. by HardwareModule derived classes) to indicate that the hardware may be started. Typically isInitialPrepared checks all DUECA-independent conditions for running (hardware, datafiles, etc.) and isPrepared checks DUECA communication.

Returns

True if ready for next phase

getObjectType()

ObjectType dueca::Module::getObjectType ( ) const

inlinevirtual

The object type within DUECA.

Implements dueca::NamedObject.

startModule()

virtual void dueca::Module::startModule ( const TimeSpec & time )

pure virtual

Start the module's activity (activities)

This is called only after isPrepared has returned true. This is called with some lead time, typically start activities at the time passed in. Associated with the "work" phase of the control panel.

Parameters

time	Start time for any activities

Implemented in dueca::ActivityViewBase, dueca::TimingView, dueca::hdf5log::HDF5Replayer, dueca::ConfigStorage, and dueca::websock::WebSocketsServerBase.

stopModule()

virtual void dueca::Module::stopModule ( const TimeSpec & time )

pure virtual

Stop the module's activity (activities)

This is called with some lead time, back to "safe" phase on the control panel.

Parameters

time	Stop time for any activities

Implemented in dueca::ActivityViewBase, dueca::TimingView, dueca::hdf5log::HDF5Replayer, dueca::ConfigStorage, and dueca::websock::WebSocketsServerBase.

initialStartModule()

virtual void dueca::Module::initialStartModule ( const TimeSpec & time )

virtual

Initial start opportunity.

This is called after isInitialPrepared returned true, associated with the "safe" phase on the control panel. This is typically used by hardware modules that need to actively control a hardware device; use a CriticalActivity to control the phase transitions between safe and work.

Parameters

time	Start time for any activities

finalStopModule()

virtual void dueca::Module::finalStopModule ( const TimeSpec & time )

virtual

Final stop command.

Transition from "safe" to "off"

Parameters

time	Stop time for any activities

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

• /home/abuild/rpmbuild/BUILD/dueca-4.1.3/dueca/Module.hxx