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BlogRedisCacheAOP.cs
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134 lines (117 loc) · 4.88 KB
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using Blog.Core.Common;
using Castle.DynamicProxy;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace Blog.Core.AOP
{
/// <summary>
/// 面向切面的缓存使用
/// </summary>
public class BlogRedisCacheAOP : IInterceptor
{
//通过注入的方式，把缓存操作接口通过构造函数注入
private IRedisCacheManager _cache;
public BlogRedisCacheAOP(IRedisCacheManager cache)
{
_cache = cache;
}
//Intercept方法是拦截的关键所在，也是IInterceptor接口中的唯一定义
public void Intercept(IInvocation invocation)
{
var method = invocation.MethodInvocationTarget ?? invocation.Method;
//对当前方法的特性验证
var qCachingAttribute = method.GetCustomAttributes(true).FirstOrDefault(x => x.GetType() == typeof(CachingAttribute)) as CachingAttribute;
if (qCachingAttribute != null)
{
//获取自定义缓存键
var cacheKey = CustomCacheKey(invocation);
//注意是 string 类型，方法GetValue
var cacheValue = _cache.GetValue(cacheKey);
if (cacheValue != null)
{
//将当前获取到的缓存值，赋值给当前执行方法
var type = invocation.Method.ReturnType;
var resultTypes = type.GenericTypeArguments;
if (type.FullName == "System.Void")
{
return;
}
object response;
if (type != null && typeof(Task).IsAssignableFrom(type))
{
//返回Task<T>
if (resultTypes.Count() > 0)
{
var resultType = resultTypes.FirstOrDefault();
// 核心1，直接获取 dynamic 类型
dynamic temp = Newtonsoft.Json.JsonConvert.DeserializeObject(cacheValue, resultType);
//dynamic temp = System.Convert.ChangeType(cacheValue, resultType);
// System.Convert.ChangeType(Task.FromResult(temp), type);
response = Task.FromResult(temp);
}
else
{
//Task 无返回方法 指定时间内不允许重新运行
response = Task.Yield();
}
}
else
{
// 核心2，要进行 ChangeType
response = System.Convert.ChangeType(_cache.Get<object>(cacheKey), type);
}
invocation.ReturnValue = response;
return;
}
//去执行当前的方法
invocation.Proceed();
//存入缓存
if (!string.IsNullOrWhiteSpace(cacheKey))
{
object response;
//Type type = invocation.ReturnValue?.GetType();
var type = invocation.Method.ReturnType;
if (type != null && 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
}
}
//自定义缓存键
private string CustomCacheKey(IInvocation invocation)
{
var typeName = invocation.TargetType.Name;
var methodName = invocation.Method.Name;
var methodArguments = invocation.Arguments.Select(GetArgumentValue).Take(3).ToList();//获取参数列表，最多三个
string key = $"{typeName}:{methodName}:";
foreach (var param in methodArguments)
{
key += $"{param}:";
}
return key.TrimEnd(':');
}
//object 转 string
private string GetArgumentValue(object arg)
{
if (arg is int || arg is long || arg is string)
return arg.ToString();
if (arg is DateTime)
return ((DateTime)arg).ToString("yyyyMMddHHmmss");
return "";
}
}
}