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The MongoDB driver for Elixir

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mongodb_driver lib mongo read_preference.ex
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lib/mongo/read_preference.ex 

defmodule Mongo.ReadPreference do

  @moduledoc ~S"""

  Determines which servers are considered suitable for read operations

  """

  @type t :: %{

    mode: :primary | :secondary | :primary_preferred | :secondary_preferred |

          :nearest,

    tag_sets: [%{String.t => String.t}],

    max_staleness_ms: non_neg_integer

  }



  @default %{

    mode: :primary,

    tag_sets: [%{}],

    max_staleness_ms: 0

  }



  def defaults(map \\ nil)

  def defaults(map) when is_map(map) do

    Map.merge(@default, map)

  end

  def defaults(_), do: @default

end