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https://issues.apache.org/jira/browse/LENS-1298?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lavkesh Lahngir updated LENS-1298:
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Status: Patch Available (was: Reopened)
> Thread should have ability to wait for Events to be processed
> -------------------------------------------------------------
>
> Key: LENS-1298
> URL: https://issues.apache.org/jira/browse/LENS-1298
> Project: Apache Lens
> Issue Type: New Feature
> Reporter: Lavkesh Lahngir
> Assignee: Lavkesh Lahngir
> Fix For: 2.7
>
> Attachments: notifySync.patch, notifysync-bug.patch
>
>
> When a thread notifies event service to process any event, it should have a
> way to wait for it to be finished.
> {code}
> LensEvent event = new LensEvent();
> synchronized(event) {
> eventservice.notifyEvent(event);
> event.wait();
> }
> {code}
> The EventHandler will do a notifyall() on the event it is done handling.
> {code}
> public void run() {
> try {
> Class<? extends LensEvent> evtClass = event.getClass();
> // Call listeners directly listening for this event type
> handleEvent(eventListeners.get(evtClass), event);
> Class<?> superClass = evtClass.getSuperclass();
> // Call listeners which listen of super types of this event type
> while (LensEvent.class.isAssignableFrom(superClass)) {
> if (eventListeners.containsKey(superClass)) {
> handleEvent(eventListeners.get(superClass), event);
> }
> superClass = superClass.getSuperclass();
> }
> } finally {
> synchronized (event) {
> event.notifyAll();
> }
> }
> }
> {code}
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