Commit graph

15 commits

Author SHA1 Message Date
William Carroll
e3c72f3fd6 Add project-local .gitignore
Since the `default.nix` file is specific to my tooling, I'm ignoring it.
2020-12-12 02:59:49 +00:00
William Carroll
cc4f67c388 Add usage instructions to top-level README
Also delete redundant `README` from `server` directory.
2020-12-12 02:49:49 +00:00
William Carroll
8c5e4e77ed Expose functions at API layer
Creating a simple HTTP RESTful API for exposing our `Server.semiprime`
function. It supports some help messages, primitive parsing and error handling,
and singular vs. batch processing of arguments.

For more sophisticated parsing and error-checking, I prefer to use Haskell's
Servant library.
2020-12-12 02:43:40 +00:00
William Carroll
45877a8b9c Include cache hit/miss info in return type
This can be useful downstream for diagnostics.
2020-12-12 02:43:35 +00:00
William Carroll
1a404a58de Expand 10^5 in README
I think it's more readable this way.
2020-12-12 02:41:09 +00:00
William Carroll
686766929a Simple Math tests
Calling `assert` within the `Enum.map` makes the errors more usable.
2020-12-12 01:36:22 +00:00
William Carroll
ee96a818e1 Define Server.semiprime
- Clear the boilerplate that `mix` generated
- Consume `Math.factor` to test which inputs are semiprimes
- Cache all inputs that are semiprimes as soon as we discover that they are
- semiprimes

I considered a couple things related to the Cache:
- Could save space by storing all semiprime factors in a tree. This would make
  the lookups more expensive. Also because the tree's depth would never exceed
  two (because all semiprimes only have two factors), the tree would be quite
  broad, and we may not be saving enough space for the trade to be worthwhile. I
  might be wrong about that though.
- We could consider pre-computing all semiprimes when we start the app, but
  without running some tests firsts, I'm not sure whether or not it's worth the
  trouble.
2020-12-12 01:32:31 +00:00
William Carroll
ab73220280 Define Cache.{list,clear} to help debugging
Since I'm often using `iex` for interactive development, these functions are
useful.
2020-12-12 01:31:51 +00:00
William Carroll
714ec29743 Define Cache and convert app to OTP
Define a simple in-memory key-value store for our cache.

TL;DR:
- Define `Cache` as a simple state-keeping `Agent`
- Define `Sup`, which starts our Cache process
- Define `App`, which starts our Supervisor process
- Whitelist `App` in `mix.exs`, so that it starts after calling `iex -S mix`
2020-12-12 01:04:39 +00:00
William Carroll
c0a88ba7d5 Add moduledoc to Extras
9 out of 10 doctors agree that every module needs a doc. Ask your doctor if
moduledocs are right for you!
2020-12-11 22:48:12 +00:00
William Carroll
1eab926121 Define stubbed default.nix
In case I want to package this project with Nix. For now, it's useful to store
this at the project root because it help my Emacs's `project-find-file`
function.
2020-12-11 22:43:53 +00:00
William Carroll
f1e4582392 Define Math module
Support `Math.factor` and cover it with tests.
2020-12-11 22:43:26 +00:00
William Carroll
6af5e4b82e Define Extras module
I'll use as the host for utility functions needed to extend the stdlib.
2020-12-11 22:42:55 +00:00
William Carroll
6ff814a6d3 Init Elixir project
Starting fresh with...

```shell
mix new server
```
2020-12-11 22:42:16 +00:00
William Carroll
c23a12746c Initialize the Semiprimes Service
This is an exciting take-home assignment because I get to write a service in
Elixir!
2020-12-11 18:52:35 +00:00