CallbackHelper Class Reference

A helper class to handle callbacks when messages arrive. More...

#include <transport/transport.hh>

Inherited by CallbackHelperT< M >, RawCallbackHelper, and SubscriptionTransport.

Public Member Functions
	CallbackHelper (bool _latching=false)
	Constructor. More...
virtual	~CallbackHelper ()
	Destructor. More...
unsigned int	GetId () const
	Get the unique ID of this callback. More...
bool	GetLatching () const
	Is the callback latching? More...
virtual std::string	GetMsgType () const
	Get the typename of the message that is handled. More...
virtual bool	HandleData (const std::string &_newdata, boost::function< void(uint32_t)> _cb, uint32_t _id)=0
	Process new incoming data. More...
virtual bool	HandleMessage (MessagePtr _newMsg)=0
	Process new incoming message. More...
virtual bool	IsLocal () const =0
	Is the callback local? More...
void	SetLatching (bool _latch)
	Set whether this callback is latching. More...

Protected Attributes
bool	latching
	True means that the callback helper will get the last published message on the topic. More...
std::mutex	latchingMutex
	Mutex to protect the latching variable. More...

Detailed Description

A helper class to handle callbacks when messages arrive.

Constructor & Destructor Documentation

CallbackHelper ( bool  _latching = false )

explicit

Constructor.

Parameters

[in]

_latching

Set to true to make the callback helper latching.

virtual ~CallbackHelper ( )

virtual

Destructor.

Member Function Documentation

unsigned int GetId

(

)

const

Get the unique ID of this callback.

Returns

The unique ID of this callback.

bool GetLatching

(

)

const

Is the callback latching?

Returns

true if the callback is latching, false otherwise

virtual std::string GetMsgType ( ) const

virtual

Get the typename of the message that is handled.

Returns

String representation of the message type

Reimplemented in RawCallbackHelper, and CallbackHelperT< M >.

virtual bool HandleData ( const std::string &  _newdata, boost::function< void(uint32_t)>  _cb, uint32_t  _id  )

pure virtual

Process new incoming data.

Parameters

[in]

_newdata

Incoming data to be processed

Returns

true if successfully processed; false otherwise

Parameters

[in]	_cb	If non-null, callback to be invoked which signals that transmission is complete.
[in]	_id	ID associated with the message data.

Implemented in RawCallbackHelper, CallbackHelperT< M >, and SubscriptionTransport.

virtual bool HandleMessage ( MessagePtr  _newMsg )

pure virtual

Process new incoming message.

Parameters

[in]

_newMsg

Incoming message to be processed

Returns

true if successfully processed; false otherwise

Implemented in RawCallbackHelper, CallbackHelperT< M >, and SubscriptionTransport.

virtual bool IsLocal ( ) const

pure virtual

Is the callback local?

Returns

true if the callback is local, false if the callback is tied to a remote connection

Implemented in RawCallbackHelper, CallbackHelperT< M >, and SubscriptionTransport.

void SetLatching

(

bool

_latch

)

Set whether this callback is latching.

This function should only be used by the Transport library.

Parameters

[in]

_latch

False to turn off latching.

Referenced by CallbackHelperT< M >::HandleData(), RawCallbackHelper::HandleData(), CallbackHelperT< M >::HandleMessage(), and RawCallbackHelper::HandleMessage().

Member Data Documentation

bool latching

protected

True means that the callback helper will get the last published message on the topic.

std::mutex latchingMutex

mutableprotected

Mutex to protect the latching variable.

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

• CallbackHelper.hh