By Oliver Sims
An cutting edge examine how companies can reap the benefits of employing object-orientation to client/server platforms. in addition to concentrating on the production of software program within the kind of CBOs, the booklet basically explains the permitting layer of "middleware" worthwhile among the working process and purposes.
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Additional info for Business Objects: Delivering Cooperative Objects for Client-Server (IBM McGraw-Hill Series)
5 we see two container objects called ‘Store Room’ (the icon is meant to represent a cupboard), and ‘Stationery’. The user has tidied most of the objects into one of these two. 5 shows how the user has double-clicked on the Store Room icon (bottom left), and has ‘opened’ it, resulting in a window showing the contents of the Store Room. 5. Dustbin Order History File My Printer Note Book In-Tray Out-Tray Picking Lists Dept Printer ‘Container’ objects. The user has pulled out (by direct manipulation) several objects (Customer list, Product Catalogue, the Stationery container, and the Department Printer) from the Store-Room.
A good principle for object-based user interface design is the principle of ‘least astonishment’, which goes something like this, and where ‘correct’ means correct in human factors terms: For any given user action, the result which least astonishes the user is most likely to be the correct result. 24 Business Objects In our example, four business objects were represented to the user as eight objects. Each of these looked different, behaved differently, and interacted with other things in different ways than their duplicates.
In general, one or more (sometimes all) of the following problems need to be resolved: 1. GUI APIs The need to understand and code the system-level APIs needed for modern GUIs. Examples are OS/2 Presentation Manager, Windows, X-Windows. All of these require a high skill level on the part of the programmer. It can take up to six months for a good C programmer to become proficient. This explains the popularity of GUI tools, which allow one to ‘paint’ the window, and which hide the underlying complexities.