89 lines
3.3 KiB
C#
89 lines
3.3 KiB
C#
using New_College.Common;
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using Castle.DynamicProxy;
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using System;
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using System.Linq;
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using System.Threading.Tasks;
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namespace New_College.AOP
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{
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/// <summary>
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/// 面向切面的缓存使用
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/// </summary>
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public class BlogRedisCacheAOP : CacheAOPbase
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{
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//通过注入的方式，把缓存操作接口通过构造函数注入
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private readonly IRedisCacheManager _cache;
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public BlogRedisCacheAOP(IRedisCacheManager cache)
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{
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_cache = cache;
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}
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//Intercept方法是拦截的关键所在，也是IInterceptor接口中的唯一定义
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//代码已经合并 ，学习pr流程
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public override void Intercept(IInvocation invocation)
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{
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var method = invocation.MethodInvocationTarget ?? invocation.Method;
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if (method.ReturnType == typeof(void) || method.ReturnType == typeof(Task))
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{
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invocation.Proceed();
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return;
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}
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//对当前方法的特性验证
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var qCachingAttribute = method.GetCustomAttributes(true).FirstOrDefault(x => x.GetType() == typeof(CachingAttribute)) as CachingAttribute;
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if (qCachingAttribute != null)
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{
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//获取自定义缓存键
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var cacheKey = CustomCacheKey(invocation);
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//注意是 string 类型，方法GetValue
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var cacheValue = _cache.GetValue(cacheKey);
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if (cacheValue != null)
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{
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//将当前获取到的缓存值，赋值给当前执行方法
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Type returnType;
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if (typeof(Task).IsAssignableFrom(method.ReturnType))
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{
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returnType = method.ReturnType.GenericTypeArguments.FirstOrDefault();
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}
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else
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{
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returnType = method.ReturnType;
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}
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dynamic _result = Newtonsoft.Json.JsonConvert.DeserializeObject(cacheValue, returnType);
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invocation.ReturnValue = (typeof(Task).IsAssignableFrom(method.ReturnType)) ? Task.FromResult(_result) : _result;
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return;
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}
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//去执行当前的方法
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invocation.Proceed();
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//存入缓存
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if (!string.IsNullOrWhiteSpace(cacheKey))
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{
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object response;
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//Type type = invocation.ReturnValue?.GetType();
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var type = invocation.Method.ReturnType;
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if (typeof(Task).IsAssignableFrom(type))
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{
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var resultProperty = type.GetProperty("Result");
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response = resultProperty.GetValue(invocation.ReturnValue);
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}
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else
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{
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response = invocation.ReturnValue;
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}
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if (response == null) response = string.Empty;
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_cache.Set(cacheKey, response, TimeSpan.FromMinutes(qCachingAttribute.AbsoluteExpiration));
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}
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}
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else
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{
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invocation.Proceed();//直接执行被拦截方法
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}
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}
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}
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}
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