Get size of FifoDiskQueue, peak, empty it

[etayluz]

Is there a way to:

• Get size of FifoDiskQueue
• Empty out FifoDiskQueue completely
• Peak at the head of FifoDiskQueue without popping it
• Tell if it's empty

Thanks!

[Gallaecio]

@dangra Should we extend queue interfaces with this?

[MatthewScholefield]

Came to mention the same thing. Looking at the code it seems quite simple to implement peek by doing everything in pop without writing back to info. Also looks like you can get the size with q.info['size']. Should be similarly easy for the sql based queue. Personally, I think this would be a preferable addition.

@Gallaecio, @dangra would this be a welcome addition if I were to submit a PR?

[elacuesta]

Update: the only feature currently missing is "Empty out FifoDiskQueue completely". Out of the initial 4 proposed features:

1. Get size of FifoDiskQueue
2. Empty out FifoDiskQueue completely
3. Peak at the head of FifoDiskQueue without popping it
4. Tell if it's empty

(1) and (4) have been available since the initial commit, and (3) was added in #38 (not yet released at the time of writing).