%0 Journal Article
%T Implementation of absolute delay guarantee in databaseconnection pool in Web application servers<br>绝对延迟保证在Web应用服务器数据库连接池中的实现
%A LV Jian-bo
%A DAI Guan-zhong
%A MU De-jun
%A <br>吕健波
%A 戴冠中
%A 慕德俊
%J 计算机应用研究
%D 2012
%I 
%X Network QoS mechanisms are insufficient to provide complete end to end performance guarantees. In e-commerce Web sites composed of a three-tiered architecture, this paper proposed and implemented absolute delay guarantee in the database connection pool(DBCP)in Web application servers based on feedback control. It improved the database connection pool to ensure that the response time for requests with high priority was no more than the threshold specified. It set up the approximate linear time-invariant models of the DBCP through system identification and designed the absolute delay guarantee controller. It implemented all the components of closed-loops in a real DBCP for the Tomcat Web application server. Test results show that the controllers designing is effectively even if the number of concurrent requests varies severely.
%K Web application server
%K feedback control
%K absolute delay guarantee
%K system identification
%K database connection pool<br>Web应用服务器
%K 反馈控制
%K 绝对延迟保证
%K 系统辨识
%K 数据库连接池
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=A9D9BE08CDC44144BE8B5685705D3AED&aid=F886A295C1E57CC584D59B8F943216D7&yid=99E9153A83D4CB11&vid=771469D9D58C34FF&iid=94C357A881DFC066&sid=360891E30359EB81&eid=2710CD585ED12D68&journal_id=1001-3695&journal_name=计算机应用研究&referenced_num=0&reference_num=18