A basic callback sensor. More...

Inherits concepts::BasicSensor_concept, and concepts::BasicReturnValues_concept.

Public Types
enum	BasicReturnValues { OK = ..., FAILED = ... }
	Basic return values. More...
enum	StateData { READY = ..., NO_VALUE = ..., INACTIVE = ... }
	State data. More...
enum	{ SUCCESS, ERR_UNSPEC, ERR_NOMEM, ERR_BUSY, ERR_NOTIMPL, ERR_NETDOWN, ERR_HOSTUNREACH }
enum	StateValues { READY, NO_VALUE, INACTIVE }
Public Member Functions
int	state ()
	Returns the current state.
Public Attributes
typedef	OsModel
	Type of Os Concept which has been set for the sensor facet.
typedef	value_t
	Type of value that is returned.

Detailed Description

A basic callback sensor.

A callback sensor refines the Basic Sensor and provides callback functionality, so that a user can register a callback function to be notified when a sensor value changes.

When registering a callback method, this method is either called immediately after registration (id sensor is READY),or called immediately after sensor gets READY (if previously INACTIVE or NO_VALUE).

After that, the callback is called each time the sensor value changes. It is in the responsibility of the concrete model how such a change is realized.

Member Enumeration Documentation

anonymous enum [inherited]

Enumerator:

SUCCESS	Default return value of success.
ERR_UNSPEC	Unspecified error value - if no other fits.
ERR_NOMEM	Out of memory.
ERR_BUSY	Device or resource busy - try again later.
ERR_NOTIMPL	Function not implemented.
ERR_NETDOWN	Network is down.
ERR_HOSTUNREACH	No route to host.