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R.M. MENON has worked with the Oracle database for over nine years, the last six of which have been at Oracle Corporation, where he is currently Project Lead in the Server Technologies division. For the past five years, he has used JDBC and other J2EE technologies extensively as part of his work. When he is not doing research on Oracle, Menon learns Indian classical vocal music and performs at local cultural events as a singer. Occasionally, he also dabbles in sketching portraits, and drawing paintings and cartoons.

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// Reads a list from a given input stream by unpickling each element via f. let listU f st = let rec ulist_aux acc = let tag = byteU st match tag with | 0uy -> List.rev acc | 1uy -> let a = f st in ulist_aux (a::acc) | n -> failwithf "listU: found number %d" n ulist_aux [] These functions conform to the types: val val val val val val tup2P tup3P listP tup2U tup3U listU : : : : : : 'a 'a 'a 'a 'a 'a pickler -> 'b pickler -> ('a * 'b) pickler pickler -> 'b pickler -> 'c pickler -> ('a * 'b * 'c) pickler pickler -> 'a list pickler unpickler -> 'b unpickler -> ('a * 'b) unpickler unpickler -> 'b unpickler -> 'c unpickler -> ('a* 'b* 'c) unpickler unpickler -> 'a list unpickler

ROB HARROP is Principal Consultant for Interface21, specializing in delivering high-performance, highly scalable enterprise applications He is an experienced architect with a particular flair for understanding and solving complex design issues With a thorough knowledge of both Java and NET, Rob has successfully deployed projects across both platforms He has extensive experience across a variety of sectors, in particular retail and government Rob is the author of five books, including Pro Spring (Apress, 2005), a widely acclaimed, comprehensive resource on the Spring Framework Rob has been a core developer of the Spring Framework since June 2004 and currently leads the JMX and AOP efforts He cofounded UK-based software company Cake Solutions Limited in May 2001, having spent the previous two years working as Lead Developer for a successful dot-com startup Rob is a member of the JCP and is involved in the JSR-255 Expert Group for JMX 20.

ou use a lot of the services, available at different tiers, to define autonomous pieces of your application How you build them determines the public interface exposed by those services You may use interface types to describe these services, or you may use a public standard such as Web Service Description Language (WSDL) Once services are written, deciding how to expose those services to other layers, which may or may not span different physical tiers of your application, is another, somewhat separate, set of decisions Some of the technologies we ve looked at in this book are coupled to a particular mechanism for exposing them For example, creating Web Services by decorating your methods with the WebMethod attribute couples them to using WSDL for metadata, schema for type definition, and SOAP for invocation.

It is now beginning to be easy to pickle and unpickle aggregate data structures using a consistent format. For example, imagine the internal data structure is a list of integers and Booleans: type format = list<int32 * bool> let formatP = listP (tup2P int32P boolP) let formatU = listU (tup2U int32U boolU) open System.IO let writeData file data = use outStream = new BinaryWriter(File.OpenWrite(file)) formatP data outStream let readData file = use inStream = new BinaryReader(File.OpenRead(file)) formatU inStream You can now invoke the pickle/unpickle process as follows: > writeData "out.bin" [(102, true); (108, false)] ;; val it : unit > readData "out.bin";; val it : (int * bool) list = [(102, true); (108, false)]

Rob can be reached at robharrop@interface21com TOM KYTE is a Vice President in Oracle s Public Sector division Before starting at Oracle, Kyte worked as a systems integrator building largescale, heterogeneous databases and applications, mostly for military and government customers Kyte spends a great deal of time working with the Oracle database and, more specifically, working with people who are working with the Oracle database In addition, Kyte is the Tom behind the Ask Tom column (http://asktomoraclecom) in Oracle Magazine, answering people s questions about the Oracle database and its tools Kyte is also the author of Expert One-on-One Oracle (Apress, 2004) and Effective Oracle by Design (Osborne McGraw-Hill/Oracle Press, 2003), and a coauthor of Beginning Oracle Programming (Apress, 2004) These are books about the general use of the database and how to develop successful Oracle applications.