![](/img/trans.png)
[英]ASP.NET Core Converting In-Memory Cache with IMemoryCache to Redis
[英]PostSharp Caching MethodInterceptionAspect using ASP.NET Core in-memory cache
public class CacheAttribute : MethodInterceptionAspect
{
public override void OnInvoke(MethodInterceptionArgs methodInterceptionArgs)
{
if ((methodInterceptionArgs.Method.Name == CacheAspectAction.Get.ToString())
//&& (Memory.Cache[cacheKey] != null)
)
{
// methodInterceptionArgs.ReturnValue = HttpRuntime.Cache[cacheKey];
return;
}
object returnVal = methodInterceptionArgs.Invoke(methodInterceptionArgs.Arguments);
ClanCache(cacheKeyBase, cacheKey);
if (returnVal != null)
//Memory.Cache.Insert(cacheKey, returnVal, null, expirationInformation.AbsoluteExpiration, expirationInformation.SlidingExpiration);
methodInterceptionArgs.ReturnValue = returnVal;
}
}
如何从任何类(包括 PostSharp 方面)访问 ASP.NET Core 中的内存缓存? 例如,我需要访问IMemoryCache在MethodInterceptionAspect
和OnMethodBoundaryAspect
。
我将在这里假设您正在使用内置的 ASP.NET Core 依赖项注入和 IMemoryCache 实现。 但是,该示例可以很容易地适用于其他实现方式。 我将选择Global Service Locator方法来解决方面的依赖关系。 以下是文档页面中修改后的示例。
// A helper class that resolves services using built-in ASP.NET Core service provider.
public static class AspectServiceLocator
{
private static IServiceProvider serviceProvider;
public static void Initialize(IWebHost host)
{
serviceProvider = host.Services;
}
public static Lazy<T> GetService<T>() where T : class
{
return new Lazy<T>(GetServiceImpl<T>);
}
private static T GetServiceImpl<T>()
{
if (serviceProvider == null)
throw new InvalidOperationException();
return (T) serviceProvider.GetService(typeof(T));
}
}
public class Program
{
public static void Main(string[] args)
{
IWebHost host = CreateWebHostBuilder(args).Build();
// Initialize the AspectServiceLocator during ASP.NET Core program start-up
AspectServiceLocator.Initialize(host);
host.Run();
}
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>();
}
[PSerializable]
public class CacheAttribute : MethodInterceptionAspect
{
private static Lazy<IMemoryCache> cache;
static CacheAttribute()
{
// Use AspectServiceLocator to initialize the cache service field at application run-time.
if (!PostSharpEnvironment.IsPostSharpRunning)
{
cache = AspectServiceLocator.GetService<IMemoryCache>();
}
}
public override void OnInvoke(MethodInterceptionArgs args)
{
object cacheKey = args.Method.Name;
object cachedResult;
if (cache.Value.TryGetValue(cacheKey, out cachedResult))
{
args.ReturnValue = cachedResult;
return;
}
args.Proceed();
cache.Value.Set(cacheKey, args.ReturnValue);
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.