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BlogCacheAOP.cs
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80 lines (73 loc) · 2.66 KB
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using Blog.Core.Common;
using Blog.Core.Common.MemoryCache;
using Castle.DynamicProxy;
using System;
using System.Linq;
namespace Blog.Core.AOP
{
/// <summary>
/// 面向切面的缓存使用
/// </summary>
public class BlogCacheAOP : IInterceptor
{
//通过注入的方式，把缓存操作接口通过构造函数注入
private readonly ICaching _cache;
public BlogCacheAOP(ICaching 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
//如果需要验证
if (method.GetCustomAttributes(true).FirstOrDefault(x => x.GetType() == typeof(CachingAttribute)) is CachingAttribute qCachingAttribute)
{
//获取自定义缓存键
var cacheKey = CustomCacheKey(invocation);
//根据key获取相应的缓存值
var cacheValue = _cache.Get(cacheKey);
if (cacheValue != null)
{
//将当前获取到的缓存值，赋值给当前执行方法
invocation.ReturnValue = cacheValue;
return;
}
//去执行当前的方法
invocation.Proceed();
//存入缓存
if (!string.IsNullOrWhiteSpace(cacheKey))
{
_cache.Set(cacheKey, invocation.ReturnValue);
}
}
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 "";
}
}
}