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lib/kino/attribute_store.ex
defmodule Kino.AttributeStore do
@moduledoc false
@table_name __MODULE__
@doc """
Initializes resources for global attrs.
"""
@spec initialize() :: :ok
def initialize() do
:ets.new(@table_name, [:set, :named_table, :public])
:ok
end
@doc """
Increments the given counter and returns the new value.
"""
@spec counter_next(term()) :: integer()
def counter_next(key) do
:ets.update_counter(@table_name, key, {2, 1}, {key, 0})
end
@doc """
Sets the counter to `value` unless it already has a higher value.
Returns the new counter value.
"""
@spec counter_put_max(term(), integer()) :: integer()
def counter_put_max(key, value) do
[_, counter] =
:ets.update_counter(@table_name, key, [{2, -1, value, value - 1}, {2, 1}], {key, 0})
counter
end
@doc """
Puts the shared attribute value.
"""
@spec put_attribute(term(), term()) :: boolean()
def put_attribute(key, value) do
:ets.insert(@table_name, {key, value})
end
@doc """
Returns the attribute value for a given key.
"""
@spec get_attribute(term()) :: term()
def get_attribute(key, default \\ nil) do
case :ets.lookup(@table_name, key) do
[] -> default
[{_key, value} | _] -> value
end
end
end