/// <summary>
/// 获取给实体属性定义的所有验证器序列，这些验证器通过 <see cref="MetadataTypeAttribute"/> 特性所指定的类型列定义。
/// </summary>
/// <param name="property">要获取验证器的实体属性。</param>
/// <exception cref="ArgumentNullException"><paramref name="property"/> 参数为 null。</exception>
/// <returns>一个 <see cref="ValidationAttribute"/> 的序列。</returns>
public static IEnumerable <ValidationAttribute> GetValidations(IProperty property)
{
Guard.ArgumentNull(property, "property");
var entityType = property.EntityType;
var propertyName = property.Name;
return(locker.LockRead(() =>
{
Dictionary <string, List <ValidationAttribute> > pdic = null;
if (!propertyValidations.TryGetValue(entityType, out pdic))
{
locker.LockWrite(() =>
{
pdic = propertyValidations.TryGetValue(entityType, () => GetPropertyValidations(entityType));
});
}
List <ValidationAttribute> attrs = null;
if (!pdic.TryGetValue(propertyName, out attrs))
{
locker.LockWrite(() =>
{
attrs = pdic.TryGetValue(propertyName, () => new List <ValidationAttribute>());
});
}
return attrs;
}));
}
/// <summary>
/// 尝试获取指定缓存键的对象，如果没有则使用工厂函数添加对象到缓存中。
/// </summary>
/// <typeparam name="T">缓存对象的类型。</typeparam>
/// <param name="cacheKey">用于引用对象的缓存键。</param>
/// <param name="factory">用于添加缓存对象的工厂函数。</param>
/// <param name="expiration">判断对象过期的对象。</param>
/// <returns></returns>
public T TryGet <T>(string cacheKey, System.Func <T> factory, System.Func <ICacheItemExpiration> expiration = null)
{
try
{
using (var client = manager.GetClient())
{
var set = client.As <T>();
T value = default(T);
locker.LockRead(() =>
{
if (!set.ContainsKey(cacheKey))
{
if (factory != null)
{
locker.LockWrite(() =>
{
value = factory();
DateTime?time = null;
if (expiration != null)
{
var relative = expiration() as RelativeTime;
if (relative != null)
{
time = DateTime.Now + relative.Expiration;
}
}
if (time == null)
{
client.Set <T>(cacheKey, value);
}
else
{
client.Set <T>(cacheKey, value, time.Value);
}
});
}
}
else
{
value = set.GetValue(cacheKey);
}
});
return(value);
}
}
catch (Exception exp)
{
throw new InvalidOperationException("无法完成缓存操作。", exp);
}
}