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using System;
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using EntrustSettle.Common;
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using Castle.DynamicProxy;
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using System.Linq;
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using System.Threading.Tasks;
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using EntrustSettle.Common.Caches;
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namespace EntrustSettle.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 BlogCacheAOP : 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 ICaching _cache;
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public BlogCacheAOP(ICaching 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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public override void Intercept(IInvocation invocation)
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{
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var method = invocation.MethodInvocationTarget ?? invocation.Method;
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//对当前方法的特性验证
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//如果需要验证
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var CachingAttribute = method.GetCustomAttributes(true).FirstOrDefault(x => x.GetType() == typeof(CachingAttribute));
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if (CachingAttribute is CachingAttribute qCachingAttribute)
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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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if (_cache.Exists(cacheKey))
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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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//根据key获取相应的缓存值
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dynamic cacheValue = _cache.Get(returnType, cacheKey);
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invocation.ReturnValue = (typeof(Task).IsAssignableFrom(method.ReturnType)) ? Task.FromResult(cacheValue) : cacheValue;
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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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dynamic result = invocation.ReturnValue;
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response = result.Result;
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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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} |