Package fr.esrf.TangoApi.events

Classes for client events management.

See:
Description

Interface Summary

IEventConsumer
ITangoArchiveListener
ITangoAttConfigListener
ITangoChangeListener
ITangoDataReadyListener
ITangoPeriodicListener
ITangoQualityChangeListener
ITangoUserListener

Class Summary

DbEventImportInfo
EventCallBackStruct
EventChannelStruct
EventConsumer
EventData
EventDispatcher
EventQueue	This class manage a vector of EventData to implement an event queue mechanism..
TangoArchive
TangoArchiveEvent
TangoAttConfig
TangoAttConfigEvent
TangoChange
TangoChangeEvent
TangoDataReady
TangoDataReadyEvent
TangoEventsAdapter
TangoPeriodic
TangoPeriodicEvent
TangoQualityChange
TangoQualityChangeEvent
TangoUser
TangoUserEvent

Package fr.esrf.TangoApi.events Description

Classes for client events management.

/**
* Example of a client using the TANGO events Api
*/

import fr.esrf.Tango.*;
import fr.esrf.TangoDs.*;
import fr.esrf.TangoApi.*;
import fr.esrf.TangoApi.events*;

public class TestEvents
{

public TestEvents(String devname) throws DevFailed
{
// Subscribe to a change event
TangoEventsAdapter event_supplier = new TangoEventsAdapter(devname);
PositionEventListener listener = new PositionEventListener();
event_supplier.addTangoChangeListener(listener, "Position", new String[0]);
}
public static void main (String[] args)
{
String devname = "stepper/motor/1";
TestEvents client;

try
{
client = new TestEvents(devname);
}
catch(DevFailed e)
{
Except.print_exception(e);
}
}

// Position event listener
//--------------------------------
class PositionEventListener implements ITangoChangeListener
{
public void change(TangoChangeEvent event)
{
// Get attribute device name
TangoChange tc = (TangoChange)event.getSource();
String devname = tc.getEventSupplier().name();

try {
// Get attribute and extract value
DeviceAttribute attr = event.getValue();
short value = attr.extractShort();
System.out.println("Position changed on " + devname + ": " + value);
}
catch (DevFailed e)
{
// Check if heart beat
if (e.errors[0].reason.equals("API_EventTimeout"))

System.out.println(devname + " : API_EventTimeout");
else
fr.esrf.TangoDs.Except.print_exception(e);
}
}
}

}