# `Chimeway.Notifier`
[🔗](https://github.com/jonlunsford/chimeway/blob/v1.0.0/lib/chimeway/notifier.ex#L1)

Behaviour contract for notification definitions.

## Delayed fallback channels

`delayed_fallback_channels/2` lets notifiers mark outbound channels as delayed
fallback candidates. Returned channels must be a subset of `channels/2` output
and must never include `:in_app`.

# `orchestration_mode`

```elixir
@type orchestration_mode() :: :immediate | :digest_held
```

# `orchestration_resolution`

```elixir
@type orchestration_resolution() :: %{
  default: orchestration_mode(),
  channels: %{required(String.t()) => orchestration_mode()},
  default_digest_key: String.t() | nil,
  digest_keys: %{required(String.t()) => String.t()},
  source: :default | :notifier | :planner_override
}
```

# `workflow_resolution`

```elixir
@type workflow_resolution() :: %{
  workflow_key: String.t(),
  workflow_version: pos_integer(),
  steps: [workflow_step_resolution()],
  source: :notifier | :planner_override
}
```

# `workflow_step_resolution`

```elixir
@type workflow_step_resolution() :: %{
  step_key: String.t(),
  step_order: pos_integer(),
  channel: String.t(),
  config: map()
}
```

# `build`

```elixir
@callback build(map(), map()) :: {:ok, map()} | {:error, term()}
```

# `channels`
*optional* 

```elixir
@callback channels(map(), map()) :: {:ok, [atom() | String.t()]} | {:error, term()}
```

# `delayed_fallback_channels`
*optional* 

```elixir
@callback delayed_fallback_channels(map(), map()) ::
  {:ok, [atom() | String.t()]} | {:error, term()}
```

# `notification_key`

```elixir
@callback notification_key() :: String.t()
```

# `orchestration`
*optional* 

```elixir
@callback orchestration(map(), map()) ::
  {:ok, :immediate | :digest | :digest_held | keyword(atom()) | map()}
  | {:error, term()}
```

# `recipients`

```elixir
@callback recipients(map()) :: {:ok, [map()]} | {:error, term()}
```

# `rendering`
*optional* 

```elixir
@callback rendering(map(), map()) :: {:ok, map()} | {:error, term()}
```

# `version`

```elixir
@callback version() :: pos_integer()
```

# `workflow`
*optional* 

```elixir
@callback workflow(map(), map()) :: {:ok, map()} | {:error, term()}
```

# `normalize_workflow_declaration`

```elixir
@spec normalize_workflow_declaration(map()) ::
  {:ok, workflow_resolution()} | {:error, term()}
```

# `persisted_orchestration_override`

# `persisted_workflow_override`

# `resolve_orchestration`

```elixir
@spec resolve_orchestration(module() | nil, map(), map(), term()) ::
  {:ok, orchestration_resolution()} | {:error, term()}
```

# `resolve_rendering`

```elixir
@spec resolve_rendering(module(), map(), map()) ::
  {:ok, Chimeway.Rendering.rendering_declaration()} | {:error, term()}
```

# `resolve_workflow`

```elixir
@spec resolve_workflow(module() | nil, map(), map(), term()) ::
  {:ok, workflow_resolution() | nil} | {:error, term()}
```

# `serialize_orchestration`

```elixir
@spec serialize_orchestration(orchestration_resolution()) :: map()
```

# `serialize_workflow`

```elixir
@spec serialize_workflow(workflow_resolution()) :: map()
```

# `validate_module!`

```elixir
@spec validate_module!(module()) :: :ok | {:error, term()}
```

---

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