provider

type Provider interface {
	// Send 发送消息
	Send(ctx context.Context, n notification.Notification) (notification.NotificationResponse, error)
}

type Selector interface {
	// Next 获取下一个供应商，无可用供应商时返回错误
	Next(ctx context.Context, n notification.Notification) (Provider, error)
}

type SelectorBuilder interface {
	// Build 构造选择器，可以在Build方法上添加参数来构建更复杂的选择器
	Build() (Selector, error)
}