/// <summary>
///
/// </summary>
/// <param name="invocation"></param>
public override void Intercept(IInvocation invocation)
{
var method = invocation.MethodInvocationTarget ?? invocation.Method;
if (method.ReturnType == typeof(void) || method.ReturnType == typeof(Task))
{
invocation.Proceed();
return;
}
//对当前方法的特性验证
if (method.GetCustomAttributes(true).FirstOrDefault(x => x.GetType() == typeof(CachingAttribute)) is CachingAttribute qCachingAttribute)
{
//获取自定义缓存键
var cacheKey = qCachingAttribute.CustomKeyValue ?? CustomCacheKey(invocation);
//注意是 string 类型，方法GetValue
var cacheValue = _cache.GetValue(cacheKey);
if (cacheValue != null)
{
if (qCachingAttribute.IsDelete)
{
//删除Redis里面的数据
_cache.RemoveAsync(cacheKey);
}
else
{
//将当前获取到的缓存值，赋值给当前执行方法
Type returnType;
if (typeof(Task).IsAssignableFrom(method.ReturnType))
{
returnType = method.ReturnType.GenericTypeArguments.FirstOrDefault();
}
else
{
returnType = method.ReturnType;
}
dynamic _result = Newtonsoft.Json.JsonConvert.DeserializeObject(cacheValue, returnType);
invocation.ReturnValue = (typeof(Task).IsAssignableFrom(method.ReturnType)) ? Task.FromResult(_result) : _result;
return;
}
}
//去执行当前的方法
invocation.Proceed();
//存入缓存
if (!string.IsNullOrWhiteSpace(cacheKey) && qCachingAttribute.IsDelete == false)
{
object response;
//Type type = invocation.ReturnValue?.GetType();
var type = invocation.Method.ReturnType;
if (typeof(Task).IsAssignableFrom(type))
{
var resultProperty = type.GetProperty("Result");
response = resultProperty.GetValue(invocation.ReturnValue);
}
else
{
response = invocation.ReturnValue;
}
if (response == null)
{
response = string.Empty;
}
_cache.Set(cacheKey, response, TimeSpan.FromMinutes(qCachingAttribute.AbsoluteExpiration));
}
}
else
{
invocation.Proceed();//直接执行被拦截方法
}
}