Adding NimblePool as a supervisor child

[maartenJacobs]

The README states that the following should work:

children = [
  {GenMagic.Pool.NimblePool, pool_name: MyApp.GenMagicPool, pool_size: 2}
]

opts = [strategy: :one_for_one, name: MyApp.Supervisor]
Supervisor.start_link(children, opts)

But Supervisor runs child_spec/1 on its children, giving me this error:

** (Mix) Could not start application gen_magic_test: exited in: GenMagicTest.Application.start(:normal, [])
    ** (EXIT) an exception was raised:
        ** (ArgumentError) The module GenMagic.Pool.NimblePool was given as a child to a supervisor
but it does not implement child_spec/1.

---

I'm happy to provide a PR. I think there are at least possible 2 solutions:

• The Pool behaviour requires child_spec/1.
• The README is updated to include the child spec:

%{
  id: GenMagic.Pool.NimblePool,
  start: {GenMagic.Pool.NimblePool, :start_link, [[pool_name: MyApp.GenMagicPool, pool_size: 2]]}
}

[evadne]

Hi @maartenJacobs the NimblePool implementation has no child spec, the Poolboy implementation has it, so the README is wrong. I’ll look into it however would suggest using Poolboy for now.

[evadne]

@maartenJacobs Please test feature/pool-test latest @ f81bb829395e0a0a36281f8c7e48de13186f5ced and advise, reference the relevant test files for example use cases.

[devstopfix]

@evadne I think you should write @maartenJacobs a cheque for £1 ;-)

Yes comparing you to Knuth - the reference https://en.wikipedia.org/wiki/Knuth_reward_check

[maartenJacobs]

@maartenJacobs Please test feature/pool-test latest @ f81bb82 and advise, reference the relevant test files for example use cases.

@evadne @ [f81bb82] works as expected 🙌 The pool size default works as well.

[devstopfix]

The pool size default works as well.

@maartenJacobs will we be using a pool size of 2 ;-)