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Combinator-based pickling is a powerful technique and can be taken well beyond what has been shown here. For example, it is possible to do the following: Ensure data is compressed and shared during the pickling process by keeping tables in the input and output states. Sometimes this requires two or more phases in the pickling and unpickling process. Build in extra-efficient primitives that compress leaf nodes, such as writing out all integers using BinaryWriter.Write7BitEncodedInt and BinaryReader.Read7BitEncodedInt. Build extra combinators for arrays, sequences, and lazy values and for lists stored in other binary formats than the 0/1 tag scheme used here. Build combinators that allow dangling references to be written to the pickled data, usually written as a symbolic identifier. When the data is read, the identifiers must be resolved and relinked, usually by providing a function parameter that performs the resolution. This can be a useful technique when processing independent compilation units. Combinator-based pickling is used mainly because it allows data formats to be created and read in a relatively bug-free manner. It is not always possible to build a single pickling library suitable for all purposes, and you should be willing to customize and extend code samples such as those listed previously in order to build a set of pickling functions suitable for your needs.

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TORBEN HOLM has been in the computer business since 1987, and he has been working with Oracle as a developer and DBA since 1992 He worked for four years in the Royal Danish Airforce as a systems analyst, application developer, and DBA Later he moved on to work at Oracle Denmark in the Premium Services group as Senior Principal Consultant, where he performed application development and DBA tasks He has taught PL/SQL, SQL, DBA, and WebDB courses as well For the last four years he has worked for Miracle A/S as a consultant He is Developer 6i Certified (and partly 8i Certified, for what it s worth) He is also a member of the OakTable network..

However, you must keep in mind that someone could still add a reference to the assembly where your service is implemented and invoke it in-process Sometimes the coupling is not nearly as clear Deciding to leverage the features of Enterprise Services by creating types that inherit from ServicedComponent does not in any way couple those types to a particular method of exposure They may be created in-process with your ASPX pages, exposed directly as Web Services, or exposed via a remoting listener installed as an NT Service (to name just a few options) A lot of the time people will discuss making a choice between using Remoting, Web Services, or Enterprise Services We think this choice is artificial; the decision to use any of these technologies is not mutually exclusive from using the others.

Note Combinator-based parsing borders on a set of techniques that we don t cover in this book called

would like to thank many people who helped me in writing my first book To begin with, I want to thank Thomas Kyte of Oracle Corporation, from whose books and site (http://asktomoraclecom) I have learned many Oracle concepts Thank you, Tom, for generously agreeing to review this book, for patiently answering many of my questions on Oracle (several times on weekends), and for being such a tremendous inspiration to me and to the Oracle community at large This book would not have happened without your support and generosity I would also like to express my deepest gratitude to Rob Harrop, whose meticulous review comments made this book that much better and technically accurate My sincere thanks are also due to the reviewers Torben Holm and Julian Dyke Several other folks at Oracle Corporation have also helped me a lot.

You can use all three technologies from different contexts to get to the same method on a single type Further, this is not an exhaustive set of the choices you have In this chapter, we ll examine some of the different ways these different types of services can be exposed to other logical layers and other physical tiers of your application The services you select become the plumbing of your application..