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Database connection behaviour for database transactions and connection pooling
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lib/db_connection/sojourn/pool.ex
defmodule DBConnection.Sojourn.Pool do
@moduledoc false
@regulator DBConnection.Sojourn.Regulator
import Supervisor.Spec
def start_link(owner, mod, opts) do
children = [regulator(opts), conn_sup(mod, opts), starter(owner, opts),
watcher(owner)]
opts = [strategy: :one_for_all, max_restarts: 0]
Supervisor.start_link(children, opts)
end
def lookup_regulator(sup) do
children = Supervisor.which_children(sup)
{_, regulator, _, _} = List.keyfind(children, :regulator, 0)
regulator
end
def lookup_conn_sup(sup) do
children = Supervisor.which_children(sup)
{_, conn_sup, _, _} = List.keyfind(children, :conn_sup, 0)
conn_sup
end
## Helpers
defp watcher(owner) do
worker(DBConnection.Watcher, [owner])
end
defp regulator(opts) do
regulator = Keyword.get(opts, :regulator, @regulator)
start_opts = Keyword.get(opts, :regulator_start_opt, [])
child_opts = [id: :regulator, modules: :dynamic]
worker(:sregulator, [regulator, opts, start_opts], child_opts)
end
defp conn_sup(mod, opts) do
child_opts = Keyword.take(opts, [:shutdown])
conn = DBConnection.Connection.child_spec(mod, opts, :sojourn, child_opts)
sup_opts = Keyword.take(opts, [:max_restarts, :max_seconds])
sup_opts = [strategy: :simple_one_for_one] ++ sup_opts
supervisor(Supervisor, [[conn], sup_opts], [id: :conn_sup])
end
defp starter(owner, opts) do
worker(DBConnection.Sojourn.Starter, [owner, opts], [restart: :transient])
end
end