ilyabayel / elixir_jobs

ElixirJobs

Exercise 01

Run command

  bash ./calculate_jobs_table.sh

  +---------------------------------------------------------------------------------------------------------+
  |                                         Available jobs overview                                         |
  +---------------+-------+-------+----------+---------+------+-------------------+--------+------+---------+
  |               | Total | Admin | Business | Conseil | Créa | Marketing / Comm' | Retail | Tech | Unknown |
  +---------------+-------+-------+----------+---------+------+-------------------+--------+------+---------+
  | Total         | 5069  | 411   | 1445     | 175     | 212  | 782               | 536    | 1439 | 69      |
  | Africa        | 9     | 1     | 3        | 0       | 0    | 1                 | 1      | 3    | 0       |
  | Antarctica    | 0     | 0     | 0        | 0       | 0    | 0                 | 0      | 0    | 0       |
  | Asia          | 52    | 1     | 30       | 0       | 0    | 3                 | 7      | 11   | 0       |
  | Australia     | 1     | 0     | 0        | 0       | 0    | 0                 | 1      | 0    | 0       |
  | Europe        | 4787  | 394   | 1368     | 175     | 205  | 759               | 425    | 1401 | 60      |
  | North America | 147   | 9     | 25       | 0       | 7    | 12                | 80     | 13   | 1       |
  | Oceania       | 8     | 0     | 0        | 0       | 0    | 1                 | 7      | 0    | 0       |
  | South America | 5     | 0     | 4        | 0       | 0    | 0                 | 0      | 1    | 0       |
  | Unknown       | 60    | 6     | 15       | 0       | 0    | 6                 | 15     | 10   | 8       |
  +---------------+-------+-------+----------+---------+------+-------------------+--------+------+---------+

---

Exercise 02

In order for this data to be updated in real time, we need to store it in-memory and implement the minimum required API for interacting with the state.
If we use Elixir/Erlang we might use GenServer to store JobsStats state.

JobsStats API:

• Update whole state
• Increment spicific job counter
• Get stats
• Subscribe to state updates

So on server startup we prepare initial stats and Update whole state once. Than on new job create we get it's location and send JobsStats service a message to Increment specific job counter. And everytime we need JobsStats, we can use Get Stats. If we need it we can use pub/sub to listen for JobsStats updates in real-time.

Furthermore, my conjecture is that:

• It might be a good idea to use Rust NIF for GeoCalculations (need to be tested)
• It also might be a good idea to use Rust NIF to make mutable HashMap to update stats faster (need to be tested)

---

Exercise 03

Start with:

  mix run --no-halt

API

• / - Welcome page
• /jobs - Jobs page with query params requred
  • Query Params:
    • latitude [deg] any number
    • longitude [deg] any number
    • radius [km] must be > 0
  • Example: /jobs?latitude=0&longitude=0&radius=1