Now, app will trigger on parent object and this object will fetch all other child object collect all there responses and decides what to do overall.

old concept : trigger on all app instances individualy but the problem is that at who will decide what to do.
suppose one app restrict and other app will allow then what will be the end. so drop this idea.
Merge branch 'aclManager' of github.com:08euccs014/Song into aclManager