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lib/paper_tiger/store/application_fees.ex
defmodule PaperTiger.Store.ApplicationFees do
@moduledoc """
ETS-backed storage for Application Fee resources.
Uses the shared store pattern via `use PaperTiger.Store` which provides:
- GenServer wraps ETS table
- Reads go directly to ETS (concurrent, fast)
- Writes go through GenServer (serialized, safe)
## Architecture
- **ETS Table**: `:paper_tiger_application_fees` (public, read_concurrency: true)
- **GenServer**: Serializes writes, handles initialization
- **Shared Implementation**: All CRUD operations via PaperTiger.Store
## Examples
# Direct read (no GenServer bottleneck)
{:ok, fee} = PaperTiger.Store.ApplicationFees.get("fee_123")
# Serialized write
fee = %{id: "fee_123", charge: "ch_123", ...}
{:ok, fee} = PaperTiger.Store.ApplicationFees.insert(fee)
# Query helpers (direct ETS access)
fees = PaperTiger.Store.ApplicationFees.find_by_charge("ch_123")
"""
use PaperTiger.Store,
table: :paper_tiger_application_fees,
resource: "application_fee"
@doc """
Finds application fees by charge ID.
**Direct ETS access** - does not go through GenServer.
"""
@spec find_by_charge(String.t()) :: [map()]
def find_by_charge(charge_id) when is_binary(charge_id) do
:ets.match_object(@table, {:_, %{charge: charge_id}})
|> Enum.map(fn {_id, fee} -> fee end)
end
end