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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/pools/sojourn_broker/codel.ex
defmodule Ecto.Pools.SojournBroker.CoDel do
@moduledoc """
CoDel based broker.
Drops requests waiting for a connection using the CoDel algorithm. See
`:sbroker_codel_queue` for more information.
### Options
* `:queue_interval` - The first interval in milliseconds between drops when above target (default: `100`)
* `:queue_target` - The target time in milliseconds for requests to wait in the queue (default: `div(queue_interval, 10)`)
* `:queue_out` - Either `:out` for a FIFO queue or `:out_r` for a LIFO queue (default: `:out`)
* `:queue_drop` - Either `:drop` for head drop on max size or `:drop_r` for tail drop (default: `:drop`)
* `:queue_size` - The maximum size of the queue (default: `128`)
"""
if Code.ensure_loaded?(:sbroker) do
@behaviour :sbroker
end
@doc false
def init(opts) do
out = Keyword.get(opts, :queue_out, :out)
interval = Keyword.get(opts, :queue_interval, 100)
target = Keyword.get(opts, :queue_target, div(interval, 10))
drop = Keyword.get(opts, :queue_drop, :drop)
size = Keyword.get(opts, :queue_size, 128)
client_queue = {:sbroker_codel_queue, {out, target * 1_000, interval * 1_000, drop, size}}
worker_queue = {:sbroker_drop_queue, {:out_r, :drop, :infinity}}
{:ok, {client_queue, worker_queue, 100}}
end
end