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type ActionHandler func(context.Context, *Action) error

type Manager interface {
	// Search invokes handler with each output that matches the query.
	Search(ctx context.Context, query *search.Query, handler ActionHandler) error
	// Register a handler that will accept incoming tasks.
	Register(ctx context.Context, host *device.Instance, target *device.Instance, handler TaskHandler) error
	// Do asks the manager to send a task to a device.
	Do(ctx context.Context, device string, input *Input) (string, error)
	// Update adjusts the state of an action.
	Update(ctx context.Context, action string, status job.Status, output *Output) error
}

type TaskHandler func(context.Context, *Task) error