复杂业务简单化的一个小技巧
/// <summary>
/// 数据配置类
/// </summary>
public class SmartConfig : BaseEntity
{
/// <summary>
/// 类型
/// </summary>
[MaxLength(32)]
public string Type { get; set; }
/// <summary>
/// 类型标识
/// </summary>
[MaxLength(32)]
public string TypeIdentity { get; set; }
/// <summary>
/// 时间截
/// </summary>
[MaxLength(32)]
public string Timestamp { get; set; }
/// <summary>
/// 配置
/// </summary>
public string Config { get; set; }
}
这是Table对应的实体类,用于数据存储。
/// <summary>
/// 业务数据配置类
/// 请勿直接new这个对象，使用SmartConfigService.Get 方法获取对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <remarks>2014-08-20 ywb 创建</remarks>
public class Smart<T>
{
/// <summary>
/// 请勿直接new这个对象，使用SmartConfigService.Get 方法获取对象
/// </summary>
/// <param name="typeIdentity"></param>
/// <param name="timestamp"></param>
/// <param name="config"></param>
public Smart(string typeIdentity, string timestamp, T config)
{
this.Timestamp = timestamp;
this.Type = typeof(T).Name.Replace("C_", "");
this.TypeIdentify = typeIdentity;
this.Config = config;
}
/// <summary>
/// 业务数据类型
/// </summary>
public string Type { get; private set; }
/// <summary>
/// 业务数据标识
/// </summary>
public string TypeIdentify { get; private set; }
/// <summary>
/// 时间戳
/// </summary>
public string Timestamp { get; private set; }
/// <summary>
/// 配置
/// </summary>
public T Config { get; private set; }
}
业务数据配置类
/// <summary>
/// 菜 配置
/// </summary>
/// <remarks>
/// 约定命名规则为 前缀“C_ ”+ “业务表名”
/// 这种方式不太符合规范但是好用，配合VS智能提示写代码方便
/// </remarks>
public class C_Dish
{
public C_Dish()
{
//在构造函数中设置配置项的默认值
NeedCooking = true;
EnabledPrint = true;
Return = false;
AllowToCart = true;
}
/// <summary>
/// 需要厨师烹饪
/// </summary>
[Description("需要厨师烹饪")]
public bool NeedCooking { get; set; }
/// <summary>
/// 状态为“完成”时可退
/// </summary>
[Description("状态“完成”时能退")]
public bool Return { get; set; }
/// <summary>
/// 启用打印
/// </summary>
[Description("启用打印")]
public bool EnabledPrint { get; set; }
/// <summary>
/// 允许顾客点餐
/// </summary>
[Description("允许顾客点餐")]
public bool AllowToCart { get; set; }
}
这是具体业务拥有的配置，在构造函数中设置业务数据配置项的默认值
/// <summary>
/// 配置Service
/// </summary>
public static class SmartConfigService
{
/// <summary>
/// 更新 SySmartConfig
/// 如果返回false 很可能是并发引起的，需要业务终止执行。
/// </summary>
/// <param name="type">业务类型</param>
/// <param name="typeIdentity">业务类型标识</param>
/// <param name="config">配置</param>
/// <param name="timestamp">更新前的时间戳</param>
/// <param name="newTimestamp">更新后的时间戳</param>
/// <returns></returns>
public static bool Update(string type, string typeIdentity, string config, string timestamp, string newTimestamp)
{
var flag = DB.Wdd.Database.ExecuteSqlCommand("update SmartConfigs set Config={0},Timestamp={1} where Type={2} and TypeIdentity={3} and Timestamp={4}"
, config, newTimestamp, type, typeIdentity, timestamp) == 1;
CacheMemory.Remove(string.Format(CacheKey.Domain_SmartConfig, type, typeIdentity));
return flag;
}
/// <summary>
/// 获取 SySmartConfig 如果数据库中没有，则创建并返回SySmartConfig
/// </summary>
/// <param name="type">业务类型</param>
/// <param name="typeIdentity">业务类型标识</param>
/// <param name="timestamp">时间戳</param>
/// <returns></returns>
public static SmartConfig Get(string type, string typeIdentity, string timestamp)
{
var cacheKey = string.Format(CacheKey.Domain_SmartConfig, type, typeIdentity);
return CacheMemory.Get<SmartConfig>(cacheKey, () =>
{
var config = DB.Wdd.SmartConfigs.FirstOrDefault(p => p.Type == type && p.TypeIdentity == typeIdentity);
if (config != null) return config;
config = new SmartConfig()
{
Config = string.Empty,
Timestamp = timestamp,
Type = type,
TypeIdentity = typeIdentity
};
DB.Wdd.AddEntity<SmartConfig>(config);
return config;
}, new TimeSpan(24, 0, 0));
}
/// <summary>
/// 保存 业务数据配置
/// 如果返回false 很可能是并发引起的，需要业务终止执行。
/// </summary>
/// <param name="smart">业务数据配置.</param>
public static bool Save<T>(Smart<T> smart)
{
if (smart == null) throw new ArgumentNullException("smart");
return Update(smart.Type, smart.TypeIdentify, Newtonsoft.Json.JsonConvert.SerializeObject(smart.Config), smart.Timestamp, Timestamp(DateTime.Now));
}
/// <summary>
/// 获取 业务数据配置
/// </summary>
/// <param name="typeIdentity">业务类型标识.</param>
public static Smart<T> Get<T>(string typeIdentity)
{
var type = typeof(T).Name.Replace("C_", "");
var smartConfig = Get(type, typeIdentity, Timestamp(DateTime.Now));
if (string.IsNullOrEmpty(smartConfig.Config)) smartConfig.Config = "{}";
//转换出错异常不处理
var config = Newtonsoft.Json.JsonConvert.DeserializeObject<T>(smartConfig.Config);
return new Smart<T>(typeIdentity, smartConfig.Timestamp, config);
}
/// <summary>
/// 获取时间戳.
/// </summary>
/// <param name="dt">时间.</param>
/// <returns></returns>
private static string Timestamp(DateTime dt)
{
DateTime dt1 = new DateTime(1970, 1, 1);
TimeSpan ts = dt - dt1;
return ts.TotalMilliseconds.ToString();
}
}
这是接口层代码实现，开发人员只需要关心以下二个方法
public static bool Save<T>(Smart<T> smart)
public static Smart<T> Get<T>(string typeIdentity)
其它方法不需要关心，可改为private。
调用代码如下：
var dish = SmartConfigService.Get<C_Dish>("1");
dish.Config.NeedCooking = true;
SmartConfigService.Save(dish);
保存的时候可以判断一下返回值如果为false，可能是因为并发，应结束业务处理
