Firebase, listening for a read -

is there way of listening read on reference? e.g

user1 adds readlistener ref/books/book1  user2 observes/reads ref/books/book1 , gets value  user1's readlistener triggered 

i haven't seen in firebase yet, , guess workaround have user2 set ref/books/book1/read value, i'm interested hear if has other ideas.

firebase simple json database. there nothing built-in fire event when user has received specific data.

but indeed said, can build yourself. chat applications need read-confirmation either per message or write "last message id received" marker.