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phoenix

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phoenix lib phoenix pubsub pg2.ex
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lib/phoenix/pubsub/pg2.ex 

defmodule Phoenix.PubSub.PG2 do

  use Supervisor



  @moduledoc """

  Phoenix PubSub adapter based on PG2.



  To use it as your PubSub adapter, simply add it to your Endpoint's config:



      config :my_app, MyApp.Endpoint,

        pubsub: [adapter: Phoenix.PubSub.PG2]



  ## Options



    * `:name` - The name to register the PubSub processes, ie: `MyApp.PubSub`

    * `:pool_size` - Both the size of the local pubsub server pool and subscriber

      shard size. Defaults `1`. A single pool is often enough for most use-cases,

      but for high subscriber counts on a single topic or greater than 1M

      clients, a pool size equal to the number of schedulers (cores) is a well

      rounded size.



  """



  def start_link(name, opts) do

    supervisor_name = Module.concat(name, Supervisor)

    Supervisor.start_link(__MODULE__, [name, opts], name: supervisor_name)

  end



  @doc false

  def init([server, opts]) do

    pool_size = Keyword.fetch!(opts, :pool_size)

    dispatch_rules = [{:broadcast, Phoenix.PubSub.PG2Server, [server, pool_size]}]



    children = [

      supervisor(Phoenix.PubSub.LocalSupervisor, [server, pool_size, dispatch_rules]),

      worker(Phoenix.PubSub.PG2Server, [server]),

    ]



    supervise children, strategy: :rest_for_one

  end

end