Claudio Ortolina
32 lines
809 B
Elixir
32 lines
809 B
Elixir
defmodule LastFm.Feed do
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@moduledoc """
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Holds a in-memory cache of scrobbled tracks.
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Tracks are keyed and ASC ordered by their scrobbling unix timestamp. While this
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is technically prone to collision, it's very unlikely for that to happen due to the
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nature of the data.
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"""
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def create_table! do
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__MODULE__ = :ets.new(__MODULE__, [:ordered_set, :named_table, :public])
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:ok
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end
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def update(tracks) do
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data = Enum.map(tracks, fn t -> {t.scrobbled_at_uts, t} end)
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:ets.delete_all_objects(__MODULE__)
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:ets.insert(__MODULE__, data)
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Phoenix.PubSub.broadcast(LastFm.PubSub, "feed:update", %{tracks: data})
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end
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def all do
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:ets.tab2list(__MODULE__)
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|> Enum.reverse()
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end
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def subscribe do
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Phoenix.PubSub.subscribe(LastFm.PubSub, "feed:update")
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end
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end
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