Hi,
I have one gwt application. I have a requirement to show frequently server
date to client side, For this, I used GWTEventService. While user logged
in, then I am sending one rpc and create one thread using timer which will
send periodically event to client.
But due to memory leak, after debugging using *JProfiler *I came to know
that date object created inside timer and due to thread creation it is not
being garbage collected.
I think I am doing somewhat wrong way. Let me know is What is right
approach to send frequently server time to client in GWT?
*This is a method which will call after login.*
public static void *registerServerTimerEvent*(final Label widget,final
String dateFormat)
{
ClientGinjector ginjector = (ClientGinjector)
WorkFlowSessionFactory.getValue(WorkFlowSesisonKey.GININJECTOR);
DispatchAsync dispatchAsync = ginjector.getDispatchAsync();
dispatchAsync.execute(new UtilityCaller(), new
AsyncCallback<UtilityCallerResult>() {
@Override
public void onFailure(Throwable caught) {
}
@Override
public void onSuccess(UtilityCallerResult result) {
String strdate;
if(dateFormat!=null){
DateTimeFormat fmt = DateTimeFormat.getFormat(dateFormat);
strdate = fmt.format(result.getServerDate());
}else{
strdate = result.getServerDate().toString();
}
setDateTime(strdate,widget);
}
});
RemoteEventService theRemoteEventService =
RemoteEventServiceFactory.getInstance().getRemoteEventService();
//add a listener to the SERVER_MESSAGE_DOMAIN
theRemoteEventService.addListener(NTTimerEvent.SERVER_MESSAGE_DOMAIN, new
RemoteEventListener() {
public void apply(Event anEvent) {
if(anEvent instanceof NTTimerEvent) {
NTTimerEvent theServerGeneratedMessageEvent = (NTTimerEvent)anEvent;
String strdate;
if(dateFormat!=null){
DateTimeFormat fmt = DateTimeFormat.getFormat(dateFormat);
strdate = fmt.format(theServerGeneratedMessageEvent.getServerDate());
}else{
strdate = theServerGeneratedMessageEvent.getServerDate().toString();
}
setDateTime(strdate,widget);
WorkFlowSessionFactory.putValue(WorkFlowSesisonKey.SERVER_DATE_TIME,theServerGeneratedMessageEvent.getServerDate());
}
}
});
}
public static void setDateTime(String dateTime,Label label) {
if(label != null){
label.setText(dateTime);
}
}
*NTTimerEvent *
*
*
public class NTTimerEvent implements Event
{
/**
*
*/
private static final long serialVersionUID = 1L;
public static final Domain SERVER_MESSAGE_DOMAIN =
DomainFactory.getDomain("server_message_domain");
private Date serverDate;
private NTTimerEvent() {}
public NTTimerEvent(Date serverDate) {
this.serverDate = serverDate;
}
public Date getServerDate() {
return serverDate;
}
public void setServerDate(Date serverDate) {
this.serverDate = serverDate;
}
}
*Handler Code:*
public class UtilityCallerActionHandler extends RemoteEventServiceServlet
implements
ActionHandler<UtilityCaller, UtilityCallerResult> {
private static Timer myEventGeneratorTimer;
@Inject
public UtilityCallerActionHandler() {
}
@Override
public UtilityCallerResult execute(UtilityCaller action,
ExecutionContext context) throws ActionException {
try{
if(myEventGeneratorTimer == null) {
myEventGeneratorTimer = new Timer(true);
myEventGeneratorTimer.schedule(new ServerTimerTask(), 0, 10000);
}
return new UtilityCallerResult();
}catch (Exception e) {
CommonUtil.printStackTrace(e);
long exceptionBeanId = 0l;
if (e instanceof NTException) {
exceptionBeanId = ((NTException)e).getExceptionBeanId();
}
throw new NTActionException(NTException.getStackTrace(e),e.getCause(),
exceptionBeanId);
}
}
@Override
public void undo(UtilityCaller action, UtilityCallerResult result,
ExecutionContext context) throws ActionException {
}
@Override
public Class<UtilityCaller> getActionType() {
return UtilityCaller.class;
}
private class ServerTimerTask extends TimerTask
{
public void run() {
* final Date theEventMessage = new Date();*
* //create the event*
* Event theEvent = new NTTimerEvent(theEventMessage);*
* //add the event, so clients can receive it*
* addEvent(NTTimerEvent.SERVER_MESSAGE_DOMAIN, theEvent);*
}
}
}
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