[TransferEngine]chore: replace slices vector with slice counter

[RuixiangMa]

Since the slices are solely utilized for counting purposes, replace them with counters to eliminate memory overhead

[alogfans]

LGTM

[stmatengss]

Why use slice counter to replace slices vector? It is a performance consideration or something?

[RuixiangMa]

Why use slice counter to replace slices vector? It is a performance consideration or something?

In the origin design, it appears that the sole requirement is for counting functionality.
Accessing and updating a single counter is generally faster than manipulating a vector, especially as the size of the vector grows. Operations like insertion on vectors can become costly as they may require shifting elements.

[alogfans]

@stmatengss Do you think it is necessary to keep slice vector? Originally it is used to track status of all slices, but it is actually done by counters.

[stmatengss]

@stmatengss Do you think it is necessary to keep slice vector? Originally it is used to track status of all slices, but it is actually done by counters.

It’s okay to delete the related codes. I will check the code again ane merge to main.