public async override Task Invoke(AspectContext context, AspectDelegate next)
{
CacheAbleAttribute attribute = context.GetAttribute <CacheAbleAttribute>();
if (attribute == null)
{
await context.Invoke(next);
return;
}
try
{
Database = RedisClient.GetDatabase();
string cacheKey = KeyGenerator.GetCacheKey(context.ServiceMethod, context.Parameters, attribute.CacheKeyPrefix);
string cacheValue = await GetCacheAsync(cacheKey);
Type returnType = context.GetReturnType();
if (string.IsNullOrWhiteSpace(cacheValue))
{
if (attribute.OnceUpdate)
{
string lockKey = $"Lock_{cacheKey}";
RedisValue token = Environment.MachineName;
if (await Database.LockTakeAsync(lockKey, token, TimeSpan.FromSeconds(10)))
{
try
{
var result = await RunAndGetReturn(context, next);
await SetCache(cacheKey, result, attribute.Expiration);
return;
}
finally
{
await Database.LockReleaseAsync(lockKey, token);
}
}
else
{
for (int i = 0; i < 5; i++)
{
Thread.Sleep(i * 100 + 500);
cacheValue = await GetCacheAsync(cacheKey);
if (!string.IsNullOrWhiteSpace(cacheValue))
{
break;
}
}
if (string.IsNullOrWhiteSpace(cacheValue))
{
var defaultValue = CreateDefaultResult(returnType);
context.ReturnValue = ResultFactory(defaultValue, returnType, context.IsAsync());
return;
}
}
}
else
{
var result = await RunAndGetReturn(context, next);
await SetCache(cacheKey, result, attribute.Expiration);
return;
}
}
var objValue = await DeserializeCache(cacheKey, cacheValue, returnType);
//缓存值不可用
if (objValue == null)
{
await context.Invoke(next);
return;
}
context.ReturnValue = ResultFactory(objValue, returnType, context.IsAsync());
}
catch (Exception)
{
if (context.ReturnValue == null)
{
await context.Invoke(next);
}
}
}
