public override Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
var t = Task.FromResult((int)context.Parameters[0]);
context.ReturnValue = t;
return(t);
}
public static AsyncAspectDelegate ConverTotReturnValueTask <T>(AsyncAspectDelegate aspectDelegate)
{
return(c =>
{
var task = CallValueTask <T>(aspectDelegate(c), c);
c.ReturnTask = new ValueTask <T>(task);
return task;
});
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
if ((bool)context.Parameters[0])
{
await next(context);
}
else
{
throw new FieldAccessException();
}
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
await next(context);
var v = context.ReturnValue;
if (v is Task <string> t)
{
context.ReturnValue = Task.FromResult(t.Result + "A");
}
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
try
{
await next(context);
}
catch (Exception ex)
{
context.SetException(ex);
await interceptor.InvokeAsync(context, next);
}
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
// 整个代码基本和我们直接使用 MemoryCache 一样
var cache = context.ServiceProvider.GetRequiredService <IMemoryCache>();
var r = await cache.GetOrCreateAsync(cacheKey, async e =>
{
await next(context); // 所以真正实现的方法逻辑都在 next 中，所以调用它就好了
e.AbsoluteExpirationRelativeToNow = absoluteExpirationRelativeToNow;
return(context.ReturnValue); // 结果都在ReturnValue ， 这里为了简单，就不写 void / Task<T> / ValueTask<T> 等等 各种返回值的兼容代码了
});
context.ReturnValue = r; // 设置 ReturnValue， 由于缓存有效期内， next不会被调用， 所以ReturnValue不会有值，我们需要将缓存结果设置到 ReturnValue
}
public AsyncAspectDelegate GetInterceptorAsync(MethodInfo method)
{
AsyncAspectDelegate baseCall = method.IsGenericMethodDefinition
? async c =>
{
await asyncGenericCallers.GetOrAdd(c.Method, serviceMethod =>
{
var m = method.MakeGenericMethod(serviceMethod.GetGenericArguments());
return(CreateAsyncCaller(m));
})(c);
}
: CreateAsyncCaller(method);
return(CreateAsyncAspectDelegate(method, baseCall));
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
var caches = context.ServiceProvider.GetRequiredService <IEnumerable <ICacheAdapter> >()
.ToDictionary(i => i.Name, StringComparer.OrdinalIgnoreCase);
var cas = context.Method.GetReflector()
.GetCustomAttributes <CacheAttribute>()
.OrderBy(i => i.Order)
.ToArray();
// 为了简单，我们就使用最简单的反射形式调用
var m = typeof(CacheInterceptor).GetMethod(nameof(CacheInterceptor.GetOrCreateAsync))
.MakeGenericMethod(context.Method.ReturnType.GetGenericArguments()[0]);
await(Task) m.Invoke(this, new object[] { caches, cas, context, next, 0 });
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
await asyncCache.GetOrAdd(context.Method, CreateHttpClientCaller)(context);
}
private AsyncAspectDelegate CreateAsyncAspectDelegate(MethodInfo serviceMethod, AsyncAspectDelegate baseCall)
{
return(FindInterceptors(serviceMethod).Select(i =>
{
CallAsyncAspectDelegate a = i.InvokeAsync;
return a;
}).Aggregate(baseCall, (i, j) => c => j(c, i)));
}
public async Task <T> GetOrCreateAsync <T>(Dictionary <string, ICacheAdapter> adapters, CacheAttribute[] options, AspectContext context, AsyncAspectDelegate next, int index)
{
if (index >= options.Length)
{
Console.WriteLine($"No found Cache at {DateTime.Now}.");
// 所有cache 都找完了，没有找到有效cache，所以需要拿真正的结果
await next(context);
// 为了简单，我们就只支持 Task<T> 的结果
return(((Task <T>)context.ReturnValue).Result);
}
var op = options[index];
T result;
var cacheName = op.CacheName;
if (adapters.TryGetValue(cacheName, out var adapter))
{
if (!adapter.TryGetValue <T>(op.CacheKey, out result))
{
// 当前缓存找不到结果，移到下一个缓存获取结果
result = await GetOrCreateAsync <T>(adapters, options, context, next, ++index);
adapter.Set(op.CacheKey, result, TimeSpan.Parse(op.Ttl)); // 更新当前缓存实现的存储
context.ReturnValue = Task.FromResult(result); // 为了简单，我们就在这儿更新返回结果，其实不该在这儿的，为什么，大家可以猜一猜为什么？
}
else
{
Console.WriteLine($"Get Cache From {cacheName} at {DateTime.Now}.");
context.ReturnValue = Task.FromResult(result); // 为了简单，我们就在这儿更新返回结果，其实不该在这儿的，为什么，大家可以猜一猜为什么？
}
}
else
{
throw new ArgumentException($"No such cache: {cacheName}.");
}
return(result);
}
public abstract Task InvokeAsync(AspectContext context, AsyncAspectDelegate next);
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
await asyncCache.GetOrAdd(context.Method, CreateAsyncPolicy)(context, next);
}
private static AsyncAspectDelegate CreateTaskExceptionConvertor(MethodInfo serviceMethod, AsyncAspectDelegate aspectDelegate)
{
if (serviceMethod.IsReturnTask())
{
var type = serviceMethod.ReturnType.GetGenericArguments()[0];
return(Constants.ConverTotReturnTask.MakeGenericMethod(type)
.Invoke(null, new object[] { aspectDelegate }) as AsyncAspectDelegate);
}
else if (serviceMethod.IsReturnValueTask())
{
var type = serviceMethod.ReturnType.GetGenericArguments()[0];
return(Constants.ConverTotReturnValueTask.MakeGenericMethod(type)
.Invoke(null, new object[] { aspectDelegate }) as AsyncAspectDelegate);
}
else
{
return(aspectDelegate);
}
}
private AsyncAspectDelegate CreateAsyncAspectDelegate(MethodInfo serviceMethod, AsyncAspectDelegate baseCall)
{
var interceptor = FindInterceptors(serviceMethod).Select(i =>
{
CallAsyncAspectDelegate a = i.InvokeAsync;
return(a);
}).Aggregate(baseCall, (i, j) => c => j(c, i));
return(CreateTaskExceptionConvertor(serviceMethod, interceptor));
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
Console.WriteLine($"{context.Service.GetType().GetReflector().FullDisplayName}.{context.Method.GetReflector().DisplayName}");
await next(context);
}
public static AsyncAspectDelegate ConverTotReturnTask <T>(AsyncAspectDelegate aspectDelegate)
{
return(c => Call <T>(aspectDelegate(c), c));
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
InjectParameters(context);
await next(context);
}
public override async Task InvokeAsync(AspectContext context, AsyncAspectDelegate next)
{
await next(context);
AddTen(context);
}
