/// <inheritdoc/>
protected override async Task ExecutingRequestInActionFilterAsync(ActionExecutingContext context, ActionExecutionDelegate next, string key)
{
var @lock = _executingLockPool.GetLock(key);
if (@lock is null)
{
CachingDiagnostics.CannotExecutionThroughLock(key, context, Context);
await Context.OnCannotExecutionThroughLock(key, context, () => next());
return;
}
bool gotLock = false;
try
{
var waitTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
gotLock = await @lock.WaitAsync(Context.LockMillisecondsTimeout, context.HttpContext.RequestAborted);
if (!gotLock) //没有获取到锁
{
_executingLockPool.Return(@lock);
await Context.OnExecutionLockTimeout(key, context, () => next());
return;
}
if (@lock.TryGetLocalCache(key, waitTime, out var responseCacheEntry))
{
_ = WriteCacheToResponseWithInterceptorAsync(context, responseCacheEntry);
@lock.Release();
_executingLockPool.Return(@lock);
return;
}
else
{
context.HttpContext.Items.Add(ResponseCachingConstants.ResponseCachingExecutingLockKey, @lock);
}
}
catch
{
if (gotLock)
{
@lock.Release();
}
_executingLockPool.Return(@lock);
throw;
}
//执行请求的后续处理逻辑
await ExecutingAndReplaceResponseStreamAsync(context, next, key);
}
/// <summary>
/// 执行请求
/// </summary>
/// <param name="context"></param>
/// <param name="next"></param>
/// <param name="key"></param>
/// <returns></returns>
protected override async Task ExecutingRequestAsync(ResourceExecutingContext context, ResourceExecutionDelegate next, string key)
{
var @lock = _executingLockPool.GetLock(key);
if (@lock is null)
{
CachingDiagnostics.CannotExecutionThroughLock(key, context, Context);
await Context.OnCannotExecutionThroughLock(key, context, () => next());
return;
}
bool gotLock = false;
try
{
var waitTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
gotLock = await @lock.WaitAsync(Context.LockMillisecondsTimeout, context.HttpContext.RequestAborted);
if (!gotLock) //没有获取到锁
{
await Context.OnExecutionLockTimeout(key, context, () => next());
return;
}
if (@lock.TryGetLocalCache(key, waitTime, out var responseCacheEntry))
{
_ = WriteCacheToResponseWithInterceptorAsync(context, responseCacheEntry);
}
else
{
responseCacheEntry = await DumpAndCacheResponseAsync(context, next, key);
if (responseCacheEntry is not null)
{
@lock.SetLocalCache(key, responseCacheEntry, DateTimeOffset.Now.ToUnixTimeMilliseconds() + Context.DurationMilliseconds);
}
}
}
finally
{
if (gotLock)
{
@lock.Release();
}
_executingLockPool.Return(@lock);
}
}