/// <summary>
/// 请求被挂起（直到被调用）返回true，直接进入执行返回false
/// </summary>
/// <param name="httpApplication"></param>
/// <returns></returns>
public static bool DoBeginRequest(HttpApplication httpApplication)
{
// 使用客户端访问的地址
// 真是的地址可能不同，如果客户端使用了代理的话。
var url = ToUrlString(httpApplication.Request);
var virtualFileCopy = WarmupUtility.EncodeUrl(url.Trim('/'));
var localCopy = Path.Combine(HostingEnvironment.MapPath(WarmupFilesPath), virtualFileCopy);
if (File.Exists(localCopy))
{
// 不缓存
httpApplication.Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1));
httpApplication.Response.Cache.SetValidUntilExpires(false);
httpApplication.Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
httpApplication.Response.Cache.SetCacheability(HttpCacheability.NoCache);
httpApplication.Response.Cache.SetNoStore();
httpApplication.Response.WriteFile(localCopy);
httpApplication.Response.End();
return(true);
}
// 存在静态缓存文件
if (File.Exists(httpApplication.Request.PhysicalPath))
{
return(true);
}
return(false);
}
private IAsyncResult BeginBeginRequest(object sender, EventArgs e, AsyncCallback cb, object extradata)
{
// 已经启动，处理请求
if (!InWarmup() || WarmupUtility.DoBeginRequest(_context))
{
var asyncResult = new DoneAsyncResult(extradata);
cb(asyncResult);
return(asyncResult);
}
else
{
// 挂起状态下的执行路径
var asyncResult = new WarmupAsyncResult(cb, extradata);
Await(asyncResult.Completed);
return(asyncResult);
}
}