The conjunction filter. More...

#include <EC_Conjunction_Filter.h>

Inheritance diagram for TAO_EC_Conjunction_Filter:

Collaboration diagram for TAO_EC_Conjunction_Filter:

Public Types
typedef unsigned int	Word
Public Member Functions
	TAO_EC_Conjunction_Filter (TAO_EC_Filter *children[], size_t n)
virtual	~TAO_EC_Conjunction_Filter (void)
	Destructor.
virtual ChildrenIterator	begin (void) const
virtual ChildrenIterator	end (void) const
virtual int	size (void) const
virtual int	filter (const RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info)
virtual int	filter_nocopy (RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info)
virtual void	push (const RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info)
virtual void	push_nocopy (RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info)
virtual void	clear (void)
virtual CORBA::ULong	max_event_size (void) const
	Returns the maximum size of the events pushed by this filter.
virtual int	can_match (const RtecEventComm::EventHeader &header) const
virtual int	add_dependencies (const RtecEventComm::EventHeader &header, const TAO_EC_QOS_Info &qos_info)
Private Member Functions
int	all_received (void) const
	Determine if all the children have received their events.
	TAO_EC_Conjunction_Filter (const TAO_EC_Conjunction_Filter &)
TAO_EC_Conjunction_Filter &	operator= (const TAO_EC_Conjunction_Filter &)
Private Attributes
TAO_EC_Filter **	children_
	The children.
size_t	n_
	The number of children.
RtecEventComm::EventSet	event_
	The event we send up (once all the children have pushed theirs).
size_t	nwords_
Word *	bitvec_
ChildrenIterator	current_child_
	The current child in the iteration, used in the push() method...

Detailed Description

The conjunction filter.

This filter waits until each one of its children has accepted at least one event. Only in that case it accepts and publishes the sequence formed by all the children events.

Memory Management

It assumes ownership of the children.

Member Typedef Documentation

typedef unsigned int TAO_EC_Conjunction_Filter::Word

Constructor & Destructor Documentation

TAO_EC_Conjunction_Filter::TAO_EC_Conjunction_Filter	(	TAO_EC_Filter *	children[],
		size_t	n
	)

Constructor. It assumes ownership of both the array and the children.

TAO_EC_Conjunction_Filter::~TAO_EC_Conjunction_Filter ( void ) [virtual]

Destructor.

TAO_EC_Conjunction_Filter::TAO_EC_Conjunction_Filter ( const TAO_EC_Conjunction_Filter & ) [private]

Member Function Documentation

int TAO_EC_Conjunction_Filter::add_dependencies	(	const RtecEventComm::EventHeader &	header,
		const TAO_EC_QOS_Info &	qos_info
	)		`[virtual]`

This is used for computing the scheduling dependencies:

Leaf filters check if the header could be matched, similar to the can_match() method; if it does they return 1, and 0 otherwise. Intermediate nodes always return 0.

This is used to build precise dependencies between the suppliers and the leaf of the filters that accept that event. Notice that only the nodes doing scheduling recurse through the list, so in configurations that do no require scheduling the recursion stops fairly soon.

Implements TAO_EC_Filter.

int TAO_EC_Conjunction_Filter::all_received ( void ) const [private]

Determine if all the children have received their events.

TAO_EC_Filter::ChildrenIterator TAO_EC_Conjunction_Filter::begin ( void ) const [virtual]

STL-like iterators Filters follow the Composite pattern. All filters expose the same interface as if they all had children, but for simple filters the iterators return an empty range.

Reimplemented from TAO_EC_Filter.

int TAO_EC_Conjunction_Filter::can_match ( const RtecEventComm::EventHeader & header ) const [virtual]

Returns 0 if an event with that header could never be accepted. This can used by the suppliers to filter out consumers that couldn't possibly be interested in their events. The rt_info and

Implements TAO_EC_Filter.

void TAO_EC_Conjunction_Filter::clear ( void ) [virtual]

Clear any saved state, must reset and assume no events have been received.

Implements TAO_EC_Filter.

TAO_EC_Filter::ChildrenIterator TAO_EC_Conjunction_Filter::end ( void ) const [virtual]

Reimplemented from TAO_EC_Filter.

int TAO_EC_Conjunction_Filter::filter	(	const RtecEventComm::EventSet &	event,
		TAO_EC_QOS_Info &	qos_info
	)		`[virtual]`

Filter this event, returns 1 if the event is accepted, 0 otherwise. Notice that there are two versions of the method, if the event is not const then filter can take ownership of the event.

Attention:: There seems to be a disparity in interfaces: Supplier always push event sets of size 1 to the EC_ProxyPushSupplier, and EC_Filters do not implement handling of sets of more than 1 event. Then, why is this not enforced by the interface by having EC_ProxyPushSupplier take an event rather than a set?

Implements TAO_EC_Filter.

int TAO_EC_Conjunction_Filter::filter_nocopy	(	RtecEventComm::EventSet &	event,
		TAO_EC_QOS_Info &	qos_info
	)		`[virtual]`

Implements TAO_EC_Filter.

CORBA::ULong TAO_EC_Conjunction_Filter::max_event_size ( void ) const [virtual]

Returns the maximum size of the events pushed by this filter.

Implements TAO_EC_Filter.

TAO_EC_Conjunction_Filter& TAO_EC_Conjunction_Filter::operator= ( const TAO_EC_Conjunction_Filter & ) [private]

void TAO_EC_Conjunction_Filter::push	(	const RtecEventComm::EventSet &	event,
		TAO_EC_QOS_Info &	qos_info
	)		`[virtual]`

This is called by the children when they accept an event and which to pass it up. Notice that there are two versions of the method, if the event is not const then filter can take ownership of the event.

Implements TAO_EC_Filter.