EventGenerator

class EventGenerator(name, events_active=True)

Base class capable of firing events

Import from taurus.core.util.event as:

from taurus.core.util.event import EventGenerator

WaitTimeout = 0.1

fireEvent(val, event_val=None)

Fires an event.

Parameters:

val (object) – event value

getEventsActive()

Determines is events are active :return: True if events are active or False otherwise :rtype: bool

isSubscribed(cb, data=None)

Determines if the given callback is registered for this event.

Parameters:

• cb (callable) – a callable object

• data (object) – extra data to send each time an event is triggered on the given callback. Default is None

Returns:

True if callback is registered or False otherwise

Return type:

bool

lock()

Locks this event generator

read()

Read the last event

Returns:

the last event value

Return type:

object

setEventsActive(events_active)

(De)activates events on this event generator.

Parameters:

events_active (bool) – activate/deactivate events

subscribeEvent(cb, data=None, with_first_event=True)

Subscribes to the event

Parameters:

• cb (callable) – a callable object

• data (boolean) – extra data to send each time an event is triggered on the given callback. Default is None.

• with_first_event – whether call the callback with the first event value (the most recent value) during the subscription process. Default is True.

unlock()

Unlocks this event generator

unsubscribeDeletedEvent(cb_ref)

for internal usage only

unsubscribeEvent(cb, data=None)

Unsubscribes the given callback from the event. If the callback is not a listener for this event a debug message is generated an nothing happens.

Parameters:

• cb (callable) – a callable object

• data (object) – extra data to send each time an event is triggered on the given callback. Default is None

waitEvent(val=None, equal=True, any=False, timeout=None, stack=None)

Waits for an event to occur

Parameters:

• val (object) – event value

• equal (bool) – check for equality. Default is True

• any (bool) – if True unblock after first event, not matter what value it has. Default is False.

• timeout (float) – maximum time to wait (seconds). Default is None meaning wait forever.

• stack – For internal usage only.

Returns:

the value of the event that unblocked the wait

Return type:

object