Web services technology is growing fast and widely in these days. SOAP, the messaging protocol of Web services, is interoperable among various Web applications which are run under heterogeneous environment because SOAP message is written in XML. This interoperability develops Internet services from human-centric into application-centric ones. One of the use cases of Web services is a Web services portal scenario. When a client accesses the portal and requests some information, the portal relays them to the Web services provider and receives results from it. Then, the portal returns results to the clients. By the way, it is an inherent weak point of SOAP protocol that it takes relatively long time to process the XML message. If the number of clients requesting information of the portal grows, the overhead of converting every client's request to a SOAP message and maintaining network connections between the portal and Web services providers also grows.
In this thesis, we propose a mechanism which can reduce the portal's overhead of processing the SOAP message and maintaining network connections. Fortunately, because the number of target Web services is limited, a target Web service receives a lot of clients' requests. We designed and implemented a request batching mechanism in the portal. It batches several clients' requests for some waiting time and combines them in one SOAP message. The portal sends the one SOAP message to the Web service provider and receives one response message from it. As a result, the request batching mechanism reduced the response time on clients and improved throughput of the portal.
웹서비스는 최근 빠르게 발전하고 널리 쓰이기 시작하는 기술이다. 웹서비스는 XML로 기술되어 있는 SOAP 메시지 프로토콜을 이용하여 이기종에서 실행되는 웹 응용 프로그램 간 상호운영성을 보장한다. 본 논문에서는 웹서비스 기술을 이용한 웹서비스 포털의 성능을 개선하는 방법을 제안한다. 웹서비스 포털은 고객들의 요청을 받아서 외부의 웹서비스 제공자로부터 정보를 가져온 다음 다시 고객들에게 되돌려주는 중간자 역할을 한다. 따라서 고객의 요청이 증가하면 포털에 병목현상이 발생할 수 있다. 이러한 문제점을 해결하기 위해 포털은 고객의 다수 요청 일괄 처리 기법을 이용하여 포털의 성능을 향상시킨다.
