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%% Returns a numeric id from 0 to 255 for the current node. |
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%% Used to generate MAM IDs. |
| 3 |
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-module(mongoose_node_num). |
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-export([node_num/0, set_node_num/1]). |
| 5 |
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| 6 |
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-type node_num() :: 0..255. |
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-export_type([node_num/0]). |
| 8 |
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| 9 |
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%% @doc Return an integer node ID. |
| 10 |
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-spec node_num() -> node_num(). |
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node_num() -> |
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%% We just return 0 if set_node_num/1 is not called. |
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persistent_term:get(?MODULE, 0). |
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-spec set_node_num(node_num()) -> ignore | updated | same. |
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set_node_num(Num) -> |
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case node_num() =:= Num of |
| 18 |
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true -> |
| 19 |
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same; |
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false -> |
| 21 |
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persistent_term:put(?MODULE, Num), |
| 22 |
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updated |
| 23 |
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end. |