/**
* Tracks open/closed lifecycle. Subclasses should always call <tt>super.onOpen()</tt> in methods
* that override this one.
*/
@Override
public void onOpen() {
if (this.place == null) {
throw new IllegalStateException("Activity " + this + " has not been started");
}
if (open) {
throw new IllegalStateException("Activity " + this + " already open");
}
open = true;
placeManager.executeOnOpenCallback(this.place);
}
