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db_connection
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Database connection behaviour for database transactions and connection pooling
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lib/db_connection/task.ex
defmodule DBConnection.Task do
@moduledoc false
@name __MODULE__
require DBConnection.Holder
def start_link() do
Task.Supervisor.start_link(name: @name)
end
def start_link(_, _) do
raise ArgumentError, "can not start the DBConnection.Task pool"
end
def child_spec(_, _, _) do
raise ArgumentError,
"can not create a child spec for the DBConnection.Task pool"
end
def run_child(mod, state, fun, opts) do
arg = [fun, self(), opts]
{:ok, pid} = Task.Supervisor.start_child(@name, __MODULE__, :init, arg)
ref = Process.monitor(pid)
_ = DBConnection.Holder.update(pid, ref, mod, state)
{pid, ref}
end
def init(fun, parent, opts) do
try do
Process.link(parent)
catch
:error, :noproc ->
exit({:shutdown, :noproc})
end
receive do
{:"ETS-TRANSFER", holder, ^parent, {:checkin, ref, _extra}} ->
Process.unlink(parent)
pool_ref = DBConnection.Holder.pool_ref(pool: parent, reference: ref, holder: holder)
checkout = {:via, __MODULE__, pool_ref}
_ = DBConnection.run(checkout, make_fun(fun), [holder: __MODULE__] ++ opts)
exit(:normal)
end
end
def checkout({:via, __MODULE__, pool_ref}, _opts) do
{:ok, pool_ref, _mod = :unused, _state = :unused}
end
defp make_fun(fun) when is_function(fun, 1) do
fun
end
defp make_fun(mfargs) do
fn(conn) ->
{mod, fun, args} = mfargs
apply(mod, fun, [conn | args])
end
end
end