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ex_esdb

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ExESDB is a reincarnation of rabbitmq/khepri, specialized for use as a BEAM-native event store.

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ex_esdb src tracker_group.erl
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src/tracker_group.erl 

-module(tracker_group).



-export([join/3, members/2, group_key/2, leave/3, notify_created/3, notify_deleted/3,

         notify_updated/3]).



-spec group_key(Store :: atom(), Feature :: atom()) -> integer().

group_key(Store, Feature) ->

  erlang:phash2({Store, Feature, trackers}).



created(Feature, Data) ->

  {feature_created, Feature, Data}.



deleted(Feature, Data) ->

  {feature_deleted, Feature, Data}.



updated(Feature, Data) ->

  {feature_updated, Feature, Data}.



-spec join(Store :: atom(), Feature :: atom(), PidOrPids :: pid() | [pid()]) -> ok.

join(Store, Feature, PidOrPids) ->

  Group = group_key(Store, Feature),

  ok = pg:join('Elixir.Phoenix.PubSub', Group, PidOrPids),

  ok.



-spec members(Store :: atom(), Feature :: atom()) -> [pid()].

members(Store, Feature) ->

  Group = group_key(Store, Feature),

  pg:get_members('Elixir.Phoenix.PubSub', Group).



-spec leave(Store :: atom(), Feature :: atom(), PidOrPids :: pid() | [pid()]) -> ok.

leave(Store, Feature, PidOrPids) ->

  Group = group_key(Store, Feature),

  ok = pg:leave('Elixir.Phoenix.PubSub', Group, PidOrPids),

  ok.



-spec notify_created(Store :: atom(), Feature :: atom(), Data :: map()) -> ok.

notify_created(Store, Feature, Data) ->

  Msg = created(Feature, Data),

  Pids = members(Store, Feature),

  lists:foreach(fun(Pid) -> Pid ! Msg end, Pids).



-spec notify_deleted(Store :: atom(), Feature :: atom(), Data :: map()) -> ok.

notify_deleted(Store, Feature, Data) ->

  Msg = deleted(Feature, Data),

  Pids = members(Store, Feature),

  lists:foreach(fun(Pid) -> Pid ! Msg end, Pids).



-spec notify_updated(Store :: atom(), Feature :: atom(), Data :: map()) -> ok.

notify_updated(Store, Feature, Data) ->

  Msg = updated(Feature, Data),

  Pids = members(Store, Feature),

  lists:foreach(fun(Pid) -> Pid ! Msg end, Pids).