# `Nebulex.Adapter.Transaction`
[🔗](https://github.com/elixir-nebulex/nebulex/blob/v3.0.3/lib/nebulex/adapter/transaction.ex#L1)

Specifies the adapter Transaction API.

# `in_transaction?`

```elixir
@callback in_transaction?(Nebulex.Adapter.adapter_meta(), Nebulex.Cache.opts()) ::
  Nebulex.Cache.ok_error_tuple(boolean())
```

Returns `{:ok, true}` if the current process is inside a transaction;
otherwise, `{:ok, false}` is returned.

If there's an error with executing the command, `{:error, reason}`
is returned, where `reason` is the cause of the error.

See `c:Nebulex.Cache.in_transaction?/1`.

# `transaction`

```elixir
@callback transaction(Nebulex.Adapter.adapter_meta(), fun(), Nebulex.Cache.opts()) ::
  Nebulex.Cache.ok_error_tuple(any())
```

Runs the given function inside a transaction.

If an Elixir exception occurs, the exception will bubble up from the
transaction function. If the cache aborts the transaction, it returns
`{:error, reason}`.

A successful transaction returns the value returned by the function wrapped
in a tuple as `{:ok, value}`.

See `c:Nebulex.Cache.transaction/2`.

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*Consult [api-reference.md](api-reference.md) for complete listing*