Class RatatoskLogInfoSubscriber

Inheritance Relationships

Base Type

  • public QObject

Class Documentation

class RatatoskLogInfoSubscriber : public QObject

Subscriber for DDS type ratatosk::types::LogInfo as a QML element.

This class is a QML element and enables QML applications to gain access to a DDS signal type as a read-only QML property.

Public Functions

explicit RatatoskLogInfoSubscriber(QObject *parent = nullptr)

Constructor.

The initialization is deferred to an init() function.

Parameters

parent – [in] QObject pointer.

virtual ~RatatoskLogInfoSubscriber()

Destructor.

double speed() const

Property accessor for speed in QML.

Returns

vessel speed [m/s]

QDateTime timestamp() const

Property accessor for timestamp in QML.

Returns

Timestamp as QML compatible type.

void init(QtToDds *dds, const QString &topic, bool with_listener = true)

Initializes DDS reader and connects Qt signals and slots.

Parameters

  • dds – [in] Pointer to QtToDds instance.

  • topic – [in] Name of DDS topic for which to subscribe.

  • with_listener – [in] Use DdsReaderListener callback to trigger eventHeard() signal.

Public Slots

void updateValue()

Takes all new samples from the subscribed topic and uses the last sample.

This slot calls take() from the DDS reader and stores the last new sample as the current value. If there were a new sample it emits <…>Changed().

Signals

void speedChanged(double speed)

DDS value has changed.

This signal is connected to the QML RatatoskLogInfoSubscriber::speed property.

Parameters

speed – [out] New value.

void timestampChanged(QDateTime timestamp)

Timestamp of DDS value has changed.

This signal is connected to the QML RatatoskLogInfoSubscriber::timestamp property.

Parameters

timestamp – [out] New timestamp value.

void eventHeard()

DdsReaderListener calls this signal when there is data available on the subscribed topic.

If RatatoskLogInfoSubscriber is initialized with_listener=true, eventHeard() will be connected to the slot updateValue().

Properties

double speed

Vessel speed [m/s].

QDateTime timestamp

Timestamp of sample.

Private Members

std::unique_ptr<sinspekto::Reader<ratatosk::types::LogInfo>> m_reader

The DDS reader wrapper class.