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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/storage/pool_supervisor.ex
defmodule EventStore.Storage.PoolSupervisor do
use Supervisor
alias EventStore.Config
@storage_pool_name :event_store_storage_pool
@defaults [
{:name, {:local, @storage_pool_name}},
{:worker_module, Postgrex},
{:size, 10},
{:max_overflow, 5}
]
def start_link do
Supervisor.start_link(__MODULE__, nil)
end
def init(_) do
config = Config.parse Application.get_env(:eventstore, EventStore.Storage)
children = [
:poolboy.child_spec(@storage_pool_name, pool_opts(config), postgrex_opts(config))
]
supervise(children, strategy: :one_for_one)
end
defp pool_opts(config) do
opts = [
size: config[:pool_size],
max_overflow: config[:pool_max_overflow]
] |> Enum.filter(fn {_,v} -> !is_nil(v) end)
Keyword.merge(@defaults, opts)
end
defp postgrex_opts(config) do
Keyword.take(config, [:username, :password, :database, :hostname, :port])
end
end