public void dispatchEvents(EventList<?> eventList) {
if (eventList.isEmpty()) {
return;
}
GWT.log(
"Retrieved "
+ eventList.getEvents().size()
+ " events from server. From "
+ eventList.getStartTag()
+ " to "
+ eventList.getEndTag());
EventTag eventListStartTag = eventList.getStartTag();
if (!eventList.getStartTag().equals(eventList.getEndTag())
&& nextTag.isGreaterOrEqualTo(eventListStartTag)) {
// We haven't missed any events - our next retrieval will be from where we got the event to.
nextTag = eventList.getEndTag();
GWT.log("Updated events. Next tag is " + nextTag);
}
if (!eventList.isEmpty()) {
GWT.log("Dispatching events from polling manager");
EventBusManager.getManager().postEvents(eventList.getEvents());
}
}
/**
* Author: Matthew Horridge<br>
* Stanford University<br>
* Bio-Medical Informatics Research Group<br>
* Date: 20/03/2013
*/
public class EventPollingManager {
private int pollingPeriodInMS;
private Timer pollingTimer;
private EventTag nextTag = EventTag.getFirst();
private ProjectId projectId;
public static EventPollingManager get(int pollingPeriodInMS, ProjectId projectId) {
return new EventPollingManager(pollingPeriodInMS, projectId);
}
private EventPollingManager(int pollingPeriodInMS, ProjectId projectId) {
if (pollingPeriodInMS < 1) {
throw new IllegalArgumentException("pollingPeriodInMS must be greater than 0");
}
this.pollingPeriodInMS = pollingPeriodInMS;
this.projectId = checkNotNull(projectId, "projectId must not be null");
// this.dispatchManager = checkNotNull(dispatchManager, "dispatchManager must not be
// null");
pollingTimer =
new Timer() {
@Override
public void run() {
pollForProjectEvents();
}
};
}
public void start() {
pollingTimer.scheduleRepeating(pollingPeriodInMS);
}
public void stop() {
pollingTimer.cancel();
}
public void pollForProjectEvents() {
GWT.log("Polling for project events for " + projectId + " from " + nextTag);
UserId userId = Application.get().getUserId();
DispatchServiceManager.get()
.execute(
new GetProjectEventsAction(nextTag, projectId, userId),
new AsyncCallback<GetProjectEventsResult>() {
@Override
public void onFailure(Throwable caught) {}
@Override
public void onSuccess(GetProjectEventsResult result) {
dispatchEvents(result.getEvents());
}
});
}
public void dispatchEvents(EventList<?> eventList) {
if (eventList.isEmpty()) {
return;
}
GWT.log(
"Retrieved "
+ eventList.getEvents().size()
+ " events from server. From "
+ eventList.getStartTag()
+ " to "
+ eventList.getEndTag());
EventTag eventListStartTag = eventList.getStartTag();
if (!eventList.getStartTag().equals(eventList.getEndTag())
&& nextTag.isGreaterOrEqualTo(eventListStartTag)) {
// We haven't missed any events - our next retrieval will be from where we got the event to.
nextTag = eventList.getEndTag();
GWT.log("Updated events. Next tag is " + nextTag);
}
if (!eventList.isEmpty()) {
GWT.log("Dispatching events from polling manager");
EventBusManager.getManager().postEvents(eventList.getEvents());
}
}
}