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Sof_Main_Evol_5_p2
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Sof_Main_Evol_5_p2 Description: Sof_Main_Evol_5_p2 Author: Sof_Main_Evol_5_p2 Other tests from this author Creation Date: 15/01/2024 Category: Others Number of questions: 11 |
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Constructing a Wrapper
A legacy system is wrapped in three steps as follows:
A _______ is constructed.
The ___________ is adapted.
The interactions between the ________ and the _______ are verified.
عارف مش عارف . A wrapper, is a program which receives input messages from the ____________, transforms the inputs into an internal representation, and invokes the target system with the newly formatted messages. The wrapper intercepts the outputs produced by the _______, transforms them into a format understood by the client, and transfers them to the client. عارف مش عارف . Conceptually, a wrapper comprises two interfaces and three event driven modules The two interfaces are an internal interface and an external interface, and the three modules are ________, ________, and ________ . عارف مش عارف . ... عارف مش عارف . ____________ interface: The interface of the wrapper that is accessed by the clients The wrapper and its client generally communicate by passing messages. Messages normally comprise a ____ and a ___. The header of a message contains control information: (i) __________. (ii) __________. (iii) __________. (iv) __________. (v) _____________________________. The message body contains the input arguments. Similarly, the message body contains the _____ values in an output message. The values contained in a message are normally _____ strings separated by a delimiter, say, a back slash ( “\” ). عارف مش عارف . _________ interface: A wrapper’s _______ interface is the interface visible to the server. The internal interface is dependent upon the _____ and type of the wrapped entity. For example, if the wrapped entity is a job, the internal interface of the wrapper is a ___________, and the job control procedure is interpreted to execute the job. On the other hand, if the encapsulated entity is a program, procedure, transaction, or a module, the internal interface is a list of ________________ of the encapsulated software. Therefore, the internal interface is extracted from ________. The parameters of the internal interface are specified in __________, thereby necessitating a translation from the input ASCII strings to the target types. عارف مش عارف . Screen Scraping Screen scraping is a common form of wrapping in which modern, say, ______________________. The new interface can be a GUI (graphical user interface) or even a web based HTML (hypertext markup language) client. Tools, such as Verastream from Attachmate, automatically generate the new screens. Screen scraping simply provides a straightforward way to continue to use a legacy system via a _________________. Screen scraping is a _____term solution to a larger problem. Many serious issues are not addressed by simply mounting a GUI on a legacy system. For example, screen scraping: (i) does not evolve to support______. (ii) incurs high __________ cost. (iii) ignores the problem of ______. Overloading is simply defined as the ability of one function to perform different tasks. عارف مش عاف . Migration Migration of LIS is the best alternative, when _______ is unsuitable and redevelopment is not acceptable due to substantial risk. However, it is a very complex process typically lasting _____ years. It offers better system understanding, ________, reduced cost, and more flexibility to meet ______ business requirements. Migration involves changes, often including _______ the system, enhancing the ________, or _______ the attributes. It retains the ____________ of the existing system. ___ migration involves creation of a modern database from the legacy database and adaptation of the application program components accordingly. A database has two main components: ______ and __________. Therefore, in general, migration comprises three main steps: (i) conversion of the existing schema to a target schema; (ii) conversion of data; and (iii) ________________ . عارف مش عارف . __________ conversion: means translating the legacy database schema into an equivalent database structure expressed in the new technology. عارف مش عارف . _______ Conversion: means movement of the data instances from the legacy database to the target database. Data conversion requires three steps: _____, ______, and _______ . First, extract data from the legacy store. Second, transform the extracted data so that their _________ match the format. In addition, _________ (a.k.a. scrubbing or cleansing) to fix or discard data that do not fit the target database. Finally, ________ the transformed data in the target database. عارف مش عارف . ________ Conversion: In the context of LIS migration, program conversion means modifying a program to access the migrated database instead of the legacy data. The conversion process leaves the ________ of the program unchanged. Program conversion depends upon the rules that are used in transforming the legacy ______ into the target schema. عارف مش عارف . |
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