Object oriented design case study, the high-level...

Seamless transition: One kind of reuse has been achieved, however: Complex computations are handled by service objects, often in several layers, but since the computations may be time consuming, the values are kept for fast reference when the same computation is needed again. Interview with several developers, study of OO diagrams, project management critical thinking of my list of problems. Develops financial information systems for world market. No clear architecture would come out of that. Their effort was not, however, well-known within Kommunedata until they "went public". The update part of the system uses a modal closed dialogue which resembles the usual solution under the Simple Architecture.


This was their first OO application.

Object-Oriented Analysis and Design Case Studies

Multiple interviews. Demo and overhead presentation. His comment was that I apparently had found a bad sample of development teams. Case 3 Company name: Implementation details confidential. Main vehicle was prototypes of screens and mathematics for calculating trends, etc. Demo of several systems.

They mastered traditional development techniques usually the customer determined which kind of diagrams, etc.

No experience, but expected the hype to be true. Long with traditional development. Information and demo version: Visual Basic. The few developers at ObjectDesign would not be able to maintain all the products they had developed in cooperation with the customers.

Object-Oriented Analysis and Design Case Studies | Kristian Guevara

The objects may be explicitly asked to recalculate their values. Could develop all kinds of interfaces. They admitted that it would be hard to add ad-hoc queries and reports, because the database wrappers were immigration attorney cover letter sample geared to that. However, they failed to provide evidence for successful applications - even when asked.

Couldn't see any difference between OO and non-OO. Their tool could generate such lshtm research proposal automatically.

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Problem avoided by ensuring that only one window could update a specific record: How contact was established: Data is in memory. Often they were happy types of figure of speech in creative writing hear that other people had the same problems.

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More than five years with OO. Interestingly, they frequently discussed parts of the code with expert users. Observations from seminars, etc.: Maintenance was done by the customers, who apparently could do it without resorting to ObjectDesign all the time. The tool and all the standard objects wrappers, observers and special GUIs were reused from project to project.

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That was the very sales theme. Not part of the architecture. Observer Objects linked the wrapper objects to the various GUI objects that somehow showed that record. To some extent they used the OoASE diagrams as a communication tool with users.

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  • Knew the problem and handled it with Observer Objects in some cases, ad-hoc updating in some cases, user controlled refresh in other cases.
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No problem since there is no database on disc. Otherwise, the update is rejected. Their application domain was very much communication protocols, and it was surprising that it was difficult to model OO-wise.

Only one layer holds the actual database records, the other is purely procedural. For objects, they did the same.

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Focused on the implementation right from the beginning. I checked through several rounds of "design" that their models were correct and used OO principles in a reasonable way. When committing the data updating the databaseOracle checks that the retrieved data the untouched copy is still the most recent.

Again, the developers were very pragmatic. Usually the company works together with the customer's developers on the job to ensure a smooth transfer of knowledge and responsibility.

Sometimes the high-level operations were distributed between wrapper objects, service objects, and GUI objects. Even if an operation didn't deal with discount, it often had to pass information about discount from the caller to another object. They very much developed what was needed for the specific customer, drawing on their general experience rather project management critical thinking a specific architecture.

The applications all followed the Complex Business Architecture, and they were the most complete examples of that architecture that I have seen. They then tested whether users and expert users could better understand one form or the other. The company was quite small and had about four developers including the manager, Anders Bonde, who developed the tool based on his mathematical background and many years of IBM experience.

Part of a multinational. Knew that it was essential to separate object operations that called "upwards" from those called from "above". He experimented with domain objects, user-oriented objects, observer objects, etc. The company had many development teams that were allowed to chose their object oriented design case study approaches and platforms.

DownTown considers each why capital punishment is wrong essay to be a customer, so special mailings and promotions are offered to each household. These objects are thus not completely degenerate.

Problem avoided by ensuring that only one window could update a specific record:

The users, however, often would have preferred a non-modal dialogue. Materials will be lent to employees only if they have 1 no overdue lendables, 2 fewer than 10 articles out, and 3 total fines less than However, he made an elegant solution to the distribution problem.

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Usually the customer's developers have no OO experience, but learn the necessary techniques during the project. Case 6 Company name: Under programmer control. That should solve most of the call-back problems.

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If returned after their due date, the employee will be charged a fine, based on the type of item books 5: The next step was to develop special screens for critical user tasks. Half-day meeting with study of code and diagrams. The conclusion was clear: Editing of data system parameters, etc.

It seemed that most of these objects had much functionality, but no other data than the parameters passed to them. A use-case diagram. Data retrieval: Monthly releases of new versions with new analysis tools. Although they considered themselves advanced, this was a very primitive exercise with the primary aim of adding a graphical face to a mainframe system.

Mentioned a tendency for large technical systems to blend with business-like applications, and suggested that technical systems would end spm essay about a person i admire having a business architecture. They didn't try to consider operations early in the analysis and design.

A single administrative application.

The entire operating system consisted of such objects. Related posts:

Observer objects made heavy use of the SmallTalk possibility for late binding and dynamic manipulation of class names and operation names. Uses problem solving lesson 11.10 layers of objects to access the database. The company has about developers.

The wrapper objects were removed automatically by SmallTalk's garbage collection when the data wasn't referenced anymore. Other teams had struggled with these problems and some had found a solution.

The technical architecture. Commit and Rollback operations exist as a standard. A PC-based measurement system interacting with special equipment. The source listings I got are confidential.

They suggested that traditional report generators be used for that - using direct access to object oriented design case study RDB. They said that these users could follow C-style expressions like those above. Asked about the traceability, the developers became fuzzy, talking about not following the method as they should, lack of tool support, facilities not yet implemented, etc.

Reusing the classes within the project for new releases or variants is not considered reuse, but maintenance.

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Many high-level operations are handled directly by the GUI objects. Not mentioned as a problem, probably because the distribution is ad-hoc. Many changes to the database resulted from this. The OO-promoters said that all the promises were true and that I had looked at the wrong cases, or that I was old-fashioned and couldn't adapt to OO.

Became successful after with a more controlled introduction of OO, restricting themselves to projects that were well suited and staffed with well-educated developers.

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Seamless transition: For any given customer, several people may be authorized to rent videos and games. Analyze user functions. At that time I didn't quite understand the problem, but when I visited Dow Jones I saw the nasty problem they were grappling with.

They used several architectures, and often mixed them. They had many years of experience with many kinds of platforms.

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