Main Page | Namespace List | Class Hierarchy | Alphabetical List | Class List | Directories | File List | Namespace Members | Class Members | File Members | Related Pages

TAO_EC_Bitmask_Filter Class Reference

The bitmask filter. More...

#include <EC_Bitmask_Filter.h>

Inheritance diagram for TAO_EC_Bitmask_Filter:

Inheritance graph
Collaboration diagram for TAO_EC_Bitmask_Filter:

Collaboration graph
List of all members.

Public Member Functions

 TAO_EC_Bitmask_Filter (CORBA::ULong source_mask, CORBA::ULong type_mask, TAO_EC_Filter *child)
virtual ~TAO_EC_Bitmask_Filter (void)
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 ACE_ENV_ARG_DECL)
virtual int filter_nocopy (RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info ACE_ENV_ARG_DECL)
virtual void push (const RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info ACE_ENV_ARG_DECL)
virtual void push_nocopy (RtecEventComm::EventSet &event, TAO_EC_QOS_Info &qos_info ACE_ENV_ARG_DECL)
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 ACE_ENV_ARG_DECL)

Private Member Functions

 TAO_EC_Bitmask_Filter (const TAO_EC_Bitmask_Filter &)
TAO_EC_Bitmask_Filteroperator= (const TAO_EC_Bitmask_Filter &)

Private Attributes

CORBA::ULong source_mask_
 The bitmasks.
CORBA::ULong type_mask_
 The children.

Detailed Description

The bitmask filter.

This filter quickly rejects events that do not match a given bitmask. If the event is not rejected based on the mask then the child is consulted to finally accept or reject the event. When composed with the Null_Filter it accepts any events that satisfy: (event.header.type & type_mask) != 0 && (event.header.type & source_mask) != 0

Memory Management

It assumes ownership of the child.

Constructor & Destructor Documentation

TAO_BEGIN_VERSIONED_NAMESPACE_DECL TAO_EC_Bitmask_Filter::TAO_EC_Bitmask_Filter CORBA::ULong  source_mask,
CORBA::ULong  type_mask,
TAO_EC_Filter child

Constructor. Events that do not satisfy:

(e.header.source & source_mask) != 0 && (e.header.type & type_mask) != 0

are immediately rejected, other events are recursively tested using the child node. It assumes ownership of the child.

TAO_EC_Bitmask_Filter::~TAO_EC_Bitmask_Filter void   )  [virtual]


TAO_EC_Bitmask_Filter::TAO_EC_Bitmask_Filter const TAO_EC_Bitmask_Filter  )  [private]

Member Function Documentation

virtual int TAO_EC_Bitmask_Filter::add_dependencies const RtecEventComm::EventHeader header,
const TAO_EC_QOS_Info &qos_info  ACE_ENV_ARG_DECL

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.

TAO_EC_Filter::ChildrenIterator TAO_EC_Bitmask_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_Bitmask_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_Bitmask_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_Bitmask_Filter::end void   )  const [virtual]

Reimplemented from TAO_EC_Filter.

int TAO_EC_Bitmask_Filter::filter const RtecEventComm::EventSet event,

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.

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_Bitmask_Filter::filter_nocopy RtecEventComm::EventSet event,

Implements TAO_EC_Filter.

CORBA::ULong TAO_EC_Bitmask_Filter::max_event_size void   )  const [virtual]

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

Implements TAO_EC_Filter.

TAO_EC_Bitmask_Filter& TAO_EC_Bitmask_Filter::operator= const TAO_EC_Bitmask_Filter  )  [private]

void TAO_EC_Bitmask_Filter::push const RtecEventComm::EventSet event,

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.

void TAO_EC_Bitmask_Filter::push_nocopy RtecEventComm::EventSet event,

Implements TAO_EC_Filter.

int TAO_EC_Bitmask_Filter::size void   )  const [virtual]

Reimplemented from TAO_EC_Filter.

Member Data Documentation

TAO_EC_Filter* TAO_EC_Bitmask_Filter::child_ [private]

The children.

CORBA::ULong TAO_EC_Bitmask_Filter::source_mask_ [private]

The bitmasks.

CORBA::ULong TAO_EC_Bitmask_Filter::type_mask_ [private]

The documentation for this class was generated from the following files:
Generated on Tue Dec 20 23:42:35 2005 for TAO_RTEvent by  doxygen