lib: refactor PriorityQueue to use private field
Today I am reading the code of PriorityQueue, I found use symbol to achieve private fields is not easy to read. so I refactor to use private field to improve readability.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Today I am reading the code of PriorityQueue, I found use symbol to achieve private fields is not easy to read. so I refactor to use private field to improve readability.