How to cancel planned handler execution if another handler was notified?

[Nikolay Artamonov]

Hi guys!

Let's assume we have simple playbook:

---
- hosts: server.com
  tasks:
    - name: Some task
    - ...
    - notify A
    - name: Some another task
    - ...
    - notify B
    - name: Some another another task
    - ...
    - notify B
  handlers:
    - name: A
    - ...
    - name: B
    - ...

How can I ensure that handler B will be performed only if A was not notified? In other words, if both A and B were notified then *only* A must be performed. If only B or only A was notified then this handler alone must be performed.

Is it possible to model these requirements in Ansible?

Thanks!

-- 

Truly yours,

Nikolay Artamonov