protected String serializePortletRenderExecutionEvents(final Set<PortalEvent> portalEvents) {
//Filter to include just portlet render events
final Map<String, PortletRenderExecutionEvent> renderEvents = new HashMap<String, PortletRenderExecutionEvent>();
for (final PortalEvent portalEvent : portalEvents) {
if (portalEvent instanceof PortletRenderExecutionEvent) {
final PortletRenderExecutionEvent portletRenderEvent = (PortletRenderExecutionEvent) portalEvent;
//Don't write out info for minimized portlets
if (!WindowState.MINIMIZED.equals(portletRenderEvent.getWindowState())) {
final IPortletWindowId portletWindowId = portletRenderEvent.getPortletWindowId();
final String eventKey = portletWindowId != null ? portletWindowId.getStringId() : portletRenderEvent.getFname();
renderEvents.put(eventKey, portletRenderEvent);
}
}
}