'how to know if updateChildren() on Firebase Realtime database was successful or not?

I am incrementing multiple nodes' value using ServerValue.increment() method

In below DB I want to increment Wallet/uID/bal value for multiple UIDs:

Firebase db

OnComplete callback always runs, but it doesn't always increments balance. I want to retry if values were not incremented, how can I know if values were incremented or not and how to retry?

Below is the code:

Map<String, Object> children = new HashMap<>();
children.put("Wallet" + "/" + UID1+"/bal", ServerValue.increment(10));
children.put("Wallet" + "/" + UID2+"/bal", ServerValue.increment(10));
children.put("Wallet" + "/" + UID3+"/bal", ServerValue.increment(10));
//and so on
        FirebaseDatabase.getInstance().getReference().updateChildren(children, new DatabaseReference.CompletionListener() {
            @Override
            public void onComplete(@Nullable DatabaseError error, @NonNull DatabaseReference ref) {
              // how to know here? if successful or any error?
            }
        });
javaandroidfirebasefirebase-realtime-database


Solution 1:[1]

All operations in a single call to updateChildren either succeed or they all fail.

If they fail on the server, the error parameter of your onComplete handler will indicate why it failed; typically that'll be related to the security rules of your database.

Solution 2:[2]

Why don't you try to check if the error is null or not? If the error is null, it's successful. Else fail. Try this code:

FirebaseDatabase.getInstance().getReference().updateChildren(children, new DatabaseReference.CompletionListener() {
            @Override
            public void onComplete(@Nullable DatabaseError error, @NonNull DatabaseReference ref) {
              if(error == null && ref != null){ 
                 // there was no error and the value is modified
              }
              else{
                 // there was an error. try to update again
              }
            }
        });

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Frank van Puffelen
Solution 2 Sambhav. K

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