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Postgres sync engine. Sync little subsets of your Postgres data into local apps and services.
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lib/electric/publisher.ex
defmodule Electric.Publisher do
@doc """
Calls many GenServers asynchronously with the same message and waits
for their responses before returning.
Returns `:ok` once all GenServers have responded or have died.
There is no timeout so if the GenServers do not respond or die, this
function will block indefinitely.
"""
def publish(pids, message) do
# Based on OTP GenServer.call, see:
# https://github.com/erlang/otp/blob/090c308d7c925e154240685174addaa516ea2f69/lib/stdlib/src/gen.erl#L243
pids
|> Enum.map(fn pid ->
ref = Process.monitor(pid)
send(pid, {:"$gen_call", {self(), ref}, message})
ref
end)
|> Enum.each(fn ref ->
receive do
{^ref, _reply} ->
Process.demonitor(ref, [:flush])
:ok
{:DOWN, ^ref, _, _, _reason} ->
:ok
end
end)
end
end