76 lines
1.7 KiB
Elixir
76 lines
1.7 KiB
Elixir
defmodule Localiser.Localisation.Room.Server do
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use GenServer
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@pubsub Localiser.PubSub
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defstruct [:id, :name, :offset_x, :offset_y, :width, :height, occupants: MapSet.new()]
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def start_link(room) do
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GenServer.start_link(__MODULE__, room, name: via(room.id))
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end
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def via(room_id) do
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{:via, Registry, {Localiser.Registry, {:room, room_id}}}
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end
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def tag_entered(room_id, tag_id) do
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GenServer.cast(via(room_id), {:tag_entered, tag_id})
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end
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def tag_left(room_id, tag_id) do
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GenServer.cast(via(room_id), {:tag_left, tag_id})
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end
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def get_occupants(room_id) do
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GenServer.call(via(room_id), :get_occupants)
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end
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@impl true
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def init(room) do
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state = %__MODULE__{
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id: room.id,
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name: room.name,
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offset_x: room.offset_x || 0.0,
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offset_y: room.offset_y || 0.0,
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width: room.width || 0.0,
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height: room.height || 0.0
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}
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{:ok, state}
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end
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@impl true
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def handle_cast({:tag_entered, tag_id}, state) do
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new_occupants = MapSet.put(state.occupants, tag_id)
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if new_occupants != state.occupants do
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broadcast(state.id, new_occupants)
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end
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{:noreply, %{state | occupants: new_occupants}}
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end
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def handle_cast({:tag_left, tag_id}, state) do
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new_occupants = MapSet.delete(state.occupants, tag_id)
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if new_occupants != state.occupants do
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broadcast(state.id, new_occupants)
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end
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{:noreply, %{state | occupants: new_occupants}}
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end
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@impl true
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def handle_call(:get_occupants, _from, state) do
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{:reply, state.occupants, state}
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end
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defp broadcast(room_id, occupants) do
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Phoenix.PubSub.broadcast(
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@pubsub,
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"room:#{room_id}",
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{:room_occupancy_changed, room_id, occupants}
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)
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end
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end
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