public override async Task Invoke(AspectContext context, AspectDelegate next)
{
String cacheKey = null;
var logger = context.ServiceProvider.GetRequiredService <ILogger <MemcacheDoBeforeAttribute> >();
try
{
//去Memcached中看看有没有我们的数据 命名空间+ 类名 + 方法名 + 参数(多个)
cacheKey = getCacheKey(context);
logger.LogInformation($"cacheKey:{cacheKey}");
var returnType = context.ServiceMethod.ReturnType;
bool isTask = false;
if (returnType.GetProperty("Result") != null)
{
isTask = true;
returnType = returnType.GetProperty("Result").PropertyType;
}
//如果Memcached 连接不上呢
if (!CachingProvider.IsConnect)
{
logger.LogError("Memcached服务器可能不存在或是连接不上");
await next(context);
return;
}
var cacheValue = CachingProvider.GetStringAsync(cacheKey).Result;
//返回值
if (string.IsNullOrEmpty(cacheValue))
{
//回Service
await next(context);
var vulue = context.ReturnValue;
if (isTask)
{
vulue = context.ReturnValue.GetType().GetProperty("Result").GetValue(context.ReturnValue, null);
}
var values = JsonConvert.SerializeObject(vulue);
//先放到Memcached中一份
await CachingProvider.SetStringAsync(cacheKey, values, TimeSpan.FromSeconds(expiry));
cacheValue = values;
}
Console.WriteLine("Before service call");
var value = JsonConvert.DeserializeObject(cacheValue, returnType);
if (isTask)
{
context.ReturnValue = value;
await context.Complete();
}
else
{
context.ReturnValue = value;
}
}
catch (Exception)
{
}
finally
{
}
}