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For synchronous method calls, the client is blocked from performing further work until the server completes its work and returns control to the client In the next chapter, we discuss asynchronous messaging and address this issue in detail..

9

There are basically six types of responses as you saw in 3; provisional, successful, redirection, client error, server error, and global error The use of numbering simplifies the use of these responses and allows vendors to use the numbering scheme within their applications to make applications more user friendly When a request is sent by the UAC, a timer is sent at the UAC to ensure a response is received within a given time The default for this timer is typically three seconds If there is no response within three seconds, the UAC will retransmit the request, and the timer is reset This could pose a problem in large networks, where latency may cause additional delays in the routing or requests To prevent large volumes of requests from clogging the network, proxies use provisional responses to stop the expiration of the response timer in the UAC.

The author acknowledges Professor William F Saam of Ohio State University for his support and encouragement throughout his career It was due to the urging of Professor Saam that the author work in the eld of IT that this book has become possible The origin of this book lies in a series of papers the author wrote for IBM s DeveloperWorks website These papers explained, in a brief manner, the evolution of the services-based integration patterns Part of the reason these papers were well received and won several awards was due to the excellent editing by the DeveloperWorks editors Patrick Flanders and Ashleigh Brothers The work by these two editors helped crystallize many of the ideas presented in this book The person most directly related to make the idea of this book into a reality is Wendy Rinaldi, an editorial director at McGraw-Hill.

Image is everything. Movie stars and politicians know it, and so do savvy businesspeople. David Yaskulka definitely falls into the latter group. In a conference of PowerSellers who were dressed in casual polo shirts and rumpled slacks, he stood out in a pink shirt with crisp white cuffs and a beautiful designer tie. He was, in fact, the embodiment of the image he has carefully cultivated for his eBay Platinum PowerSeller business, Blueberry Boutique. It s an image he promotes in public but leaves behind when he s with his family in their home on Blueberry Lane in Sturbridge, Massachusetts. I m wearing shorts and a T-shirt right now, he said when we spoke on the phone later. But I m surrounded by the finest shirts and ties in the world. I can t help but wear them once in a while.

She pushed the idea of this book internally at McGraw-Hill and kept the project on track throughout the writing, editing, and production of the book Thanks are also due to Joya Anthony for assisting Wendy in gathering various materials for the book The person who is most directly related to the technical material of this book is Timothy (Tim) Frommeyer Tim was the technical editor for this book He ensured the material in the book was accurate, and he made numerous suggestions for improving the book s material Many of his suggestions have been incorporated into the book Acknowledgements are also due to the production staff, including Anupriya Tyagi and Bart Reed Anupriya acted as the project manger for the book s production while Bart corrected the English as well as the presentation style Because of the corrections made by these two people, the book has been rendered more readable.

The provisional response extends the time for a response, and it continues to be sent until the final response is received by the UAC The proxy maintains the state of the request/response and ceases the transmission of provisional responses when it receives the final response for forwarding to the UAC The provisional response does not establish a session or a dialog It simply prevents retransmission of the request by confirming that the request was received by the proxy and is being processed When the request is forwarded to the next proxy, a timer in the first proxy is set in the same fashion as in the UAC The first proxy will then wait three seconds before retransmitting the request The second proxy will therefore send a provisional response to the first proxy.