The Application can register for one or more events so as to be notified of the same when it occurs. There are basically two main events.
· eventReadNotify– Notifies whenever read tag event occurs with read tag data as argument. By default, the event comes with tag data. If not required, we can disable using function setAttachTagDataWithReadEvent.
· eventStatusNotify– Notifies whenever status event occurs with status event data as argument.
| Event | Description |
| GPI_EVENT | A
GPI event (state change from high to low, or low to high)
has occurred on a GPI port. When this event is signaled, StatusEventData
contains |
| BUFFER_FULL_WARNING_EVENT | When the internal tag buffer is 90% full, this event will be signaled. |
| ANTENNA_EVENT | A particular Antenna has been Connected/Disconnected. When this event is signaled, StatusEventData contains Antenna and the Connection Status that has occurred. |
| INVENTORY_START_EVENT | Inventory Operation has started. In case of periodic trigger this event will be triggered for each period. |
| INVENTORY_STOP_EVENT | Inventory Operation has stopped. In case of periodic trigger this event will be triggered for each period. |
| ACCESS_START_EVENT | Access Operation has started. |
| ACCESS_STOP_EVENT | Access Operation has stopped. |
| DISCONNECTION_EVENT | Event notifying disconnection from the Reader. The Application can call reconnect method periodically to attempt reconnection or call disconnect method to cleanup and exit. |
| BUFFER_FULL_EVENT | When the internal tag data buffer is 100% full, this event will be signaled and tags are discarded in FIFO manner. |
| NXP_EAS_ALARM_EVENT | This Event is generated when Reader finds a(NXP)tag with it's EAS System bit still set to true. |
| READER_EXCEPTION_EVENT | Event notifying that an exception has occurred in the Reader. When this event is signaled, StatusEventData.ReaderExceptionEventData.ReaderExceptionEventType can be called to know the reason for the exception which is coming as part of Events.StatusEventArgs. The Application can continue to use the connection if the reader renders is usable. |
| TEMPERATURE_ALARM_EVENT | When Temperature reaches Threshold level, this event will be generated. The event data contains source name (PA/Ambient), current Temperature and alarm Level (Low, High or Critical) |
// registering for read tag data notification
EventHandler
eventHandler = new EventHandler();
reader.Events.addEventsListener(eventHandler);
//
Subscribe required status notification
reader.Events.setInventoryStartEvent(true);
reader.Events.setInventoryStopEvent(true);
reader.Events.setAccessStartEvent(true);
reader.Events.setAccessStopEvent(true);
//
enables tag read notification. if this is set to false, no tag
read notification will be send
reader.Events.setTagReadEvent(true);
reader.Events.setAntennaEvent(true);
reader.Events.setBufferFullEvent(true);
reader.Events.setBufferFullWarningEvent(true);
reader.Events.setGPIEvent(true);
reader.Events.setReaderDisconnectEvent(true);
// Read/Status Notify handler
// Implement the RfidEventsLister class to receive event
notifications
class EventHandler implements RfidEventsListener {
// Read Event Notification
public void eventReadNotify(RfidReadEvents e){
// Recommended to use new method getReadTagsEx for better performance in case of
large tag population
TagData[] myTags = reader.Actions.getReadTags(100);
if (myTags != null)
{
for (int index = 0; index < myTags.length; index++)
{
System.out.println("Tag ID " +
myTags[index].getTagID());
if (myTags[index].getOpCode() ==
ACCESS_OPERATION_CODE.ACCESS_OPERATION_READ &&
myTags[index].getOpStatus()
== ACCESS_OPERATION_STATUS.ACCESS_SUCCESS)
{
if (myTags[index].getMemoryBankData().length() > 0) {
System.out.println(" Mem Bank Data " +
myTags[index].getMemoryBankData());
}
}
}
}
}
// Status Event Notification
public void eventStatusNotify(RfidStatusEvents e) {
System.out.println("Status Notification: " +
e.StatusEventData.getStatusEventType());
}
}
// Unregistering for read tag data notification
reader.Events.removeEventsListener(eventHandler);