A connection element that can store a fixed number of data samples. More...

#include <rtt/internal/ChannelBufferElement.hpp>

Inheritance diagram for RTT::internal::ChannelBufferElement< T >:

Public Types
typedef base::ChannelElement < T >::param_t	param_t
typedef base::ChannelElement < T >::reference_t	reference_t
typedef base::ChannelElement < T >::value_t	value_t
typedef boost::intrusive_ptr < ChannelElement< T > >	shared_ptr
Public Member Functions
	ChannelBufferElement (typename base::BufferInterface< T >::shared_ptr buffer)
virtual bool	write (param_t sample)
	Appends a sample at the end of the FIFO.
virtual FlowStatus	read (reference_t sample, bool copy_old_data)
	Pops and returns the first element of the FIFO.
virtual void	clear ()
	Removes all elements in the FIFO.
virtual bool	data_sample (param_t sample)
	Provides a data sample to initialize this connection.
shared_ptr	getOutput ()
	Returns the next channel element in the channel's propagation direction.
shared_ptr	getInput ()
	Returns the current input channel element.
void	removeInput ()
	Removes the input channel (if any).
ChannelElementBase::shared_ptr	getInputEndPoint ()
	Returns the first input channel element of this connection.
ChannelElementBase::shared_ptr	getOutputEndPoint ()
	Returns the last output channel element of this connection.
void	setOutput (shared_ptr output)
	Sets the output of this channel element to output and sets the input of output to this.
virtual bool	signal ()
	Signals that there is new data available on this channel By default, the channel element forwards the call to its output.
virtual bool	inputReady ()
	This is called by an input port when it is ready to receive data.
virtual void	disconnect (bool forward)
	Performs a disconnection of this channel's endpoints.
virtual PortInterface *	getPort () const
	Gets the port this channel element is connected to.
Protected Member Functions
void	ref ()
	Increases the reference count.
void	deref ()
	Decreases the reference count, and deletes the object if it is zero.

Detailed Description

template<typename T>
class RTT::internal::ChannelBufferElement< T >

A connection element that can store a fixed number of data samples.

Definition at line 50 of file ChannelBufferElement.hpp.

Member Function Documentation

template<typename T >

virtual void RTT::internal::ChannelBufferElement< T >::clear ( ) [inline, virtual]

Removes all elements in the FIFO.

After a call to clear(), read() will always return false (provided write() has not been called in the meantime).

Reimplemented from RTT::base::ChannelElementBase.

Definition at line 106 of file ChannelBufferElement.hpp.

References RTT::base::BufferBase::clear(), and RTT::base::BufferInterface< T >::Release().

template<typename T >

virtual bool RTT::internal::ChannelBufferElement< T >::data_sample ( param_t sample ) [inline, virtual]

Provides a data sample to initialize this connection.

This is used before the first write() in order to inform this connection of the size of the data. As such enough storage space can be allocated before the actual writing begins.

Returns:: false if an error occured that requires the channel to be invalidated.

Reimplemented from RTT::base::ChannelElement< T >.

Definition at line 115 of file ChannelBufferElement.hpp.

References RTT::base::BufferInterface< T >::data_sample().

void ChannelElementBase::disconnect ( bool forward ) [virtual, inherited]

Performs a disconnection of this channel's endpoints.

If forward is true, then the disconnection is initiated by the input endpoint. Otherwise, it has been initiated by the output endpoint.

Reimplemented in RTT::corba::RemoteChannelElement< T >, RTT::internal::ConnOutputEndpoint< T >, and RTT::internal::ConnInputEndpoint< T >.

Definition at line 75 of file ChannelInterface.cpp.

References RTT::base::ChannelElementBase::getInput(), and RTT::base::ChannelElementBase::getOutput().

template<typename T>

shared_ptr RTT::base::ChannelElement< T >::getInput ( ) [inline, inherited]

Returns the current input channel element.

This will only return a valid channel element if another element has received this object as an argument to setOutput().

Returns:

Reimplemented from RTT::base::ChannelElementBase.

Definition at line 68 of file ChannelElement.hpp.

Referenced by RTT::corba::RemoteChannelElement< T >::inputReady(), RTT::base::ChannelElement< T >::read(), and RTT::mqueue::MQChannelElement< T >::signal().

ChannelElementBase::shared_ptr ChannelElementBase::getInputEndPoint ( ) [inherited]

Returns the first input channel element of this connection.

Will return the channel element the furthest away from the input port, or this if none.

Returns:: getInput() ? getInput()->getInputEndPoint() : this

Definition at line 96 of file ChannelInterface.cpp.

References RTT::base::ChannelElementBase::getInput().

ChannelElementBase::shared_ptr ChannelElementBase::getOutputEndPoint ( ) [inherited]

Returns the last output channel element of this connection.

Will return the channel element the furthest away from the output port, or this if none.

Returns:: getOutput() ? getOutput()->getInputEndPoint() : this

Definition at line 101 of file ChannelInterface.cpp.

References RTT::base::ChannelElementBase::getOutput().

PortInterface * ChannelElementBase::getPort ( ) const [virtual, inherited]

Gets the port this channel element is connected to.

Returns:: null if no port is connected to this element, the port (or a proxy representing the port) otherwise.

Reimplemented in RTT::internal::ConnOutputEndpoint< T >, and RTT::internal::ConnInputEndpoint< T >.

Definition at line 131 of file ChannelInterface.cpp.

bool ChannelElementBase::inputReady ( ) [virtual, inherited]

This is called by an input port when it is ready to receive data.

Each channel element has the responsibility to pass this notification on to the next, in the direction of the output.

Returns:: false if a fatal connection failure was encountered and the channel needs to be destroyed.

Reimplemented in RTT::corba::RemoteChannelElement< T >, RTT::mqueue::MQChannelElement< T >, RTT::internal::ConnOutputEndpoint< T >, and RTT::internal::ConnInputEndpoint< T >.

Definition at line 107 of file ChannelInterface.cpp.

References RTT::base::ChannelElementBase::getInput().

template<typename T >

virtual FlowStatus RTT::internal::ChannelBufferElement< T >::read	(	reference_t	sample,
		bool	copy_old_data
	)		`[inline, virtual]`

Pops and returns the first element of the FIFO.

Returns:: false if the FIFO was empty, and true otherwise

Reimplemented from RTT::base::ChannelElement< T >.

Definition at line 83 of file ChannelBufferElement.hpp.

References RTT::base::BufferInterface< T >::PopWithoutRelease(), and RTT::base::BufferInterface< T >::Release().

void RTT::base::ChannelElementBase::removeInput ( ) [inherited]

Removes the input channel (if any).

This call may delete channels from memory.

void ChannelElementBase::setOutput ( shared_ptr output ) [inherited]

Sets the output of this channel element to output and sets the input of output to this.

This implies that this channel element becomes the input of output. There is no setInput function since this function does both setting input and output of this and output.

Parameters:

output the next element in chain.

Definition at line 68 of file ChannelInterface.cpp.

Referenced by RTT::internal::ConnFactory::buildBufferedChannelInput(), RTT::internal::ConnFactory::buildBufferedChannelOutput(), and RTT::internal::ConnFactory::buildChannelInput().

bool ChannelElementBase::signal ( ) [virtual, inherited]

Signals that there is new data available on this channel By default, the channel element forwards the call to its output.

Returns:: false if an error occured that requires the channel to be invalidated. In no ways it indicates that the sample has been received by the other side of the channel.

Reimplemented in RTT::mqueue::MQChannelElement< T >, RTT::corba::RemoteChannelElement< T >, and RTT::internal::ConnOutputEndpoint< T >.

Definition at line 123 of file ChannelInterface.cpp.

References RTT::base::ChannelElementBase::getOutput().

Referenced by RTT::internal::ChannelDataElement< T >::write(), and RTT::internal::ChannelBufferElement< T >::write().

template<typename T >

virtual bool RTT::internal::ChannelBufferElement< T >::write ( param_t sample ) [inline, virtual]

Appends a sample at the end of the FIFO.