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INTRODUCTION TO WEB SERVICES AND DEVELOPMENT:

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Common coupling occurs when modules communicate using global (i.e., global) data areas. shared data area). For example, programming allows the developer to declare data External, accessible to all units.
Common coupling is also known as As in “universal coupling”. Two components can be said to share data using global data structures and common blocks. Example:
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The process control component maintains current operating state data. It gets data from multiple sources and then supplies data to multiple sinks.
Each source process writes directly to the global data store. Each sink process reads directly from the global data store. The diagrammatic representation is as below:
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In the above scenario, there can be a situation where the sink might see the inconsistent value of a variable an if one source is writing the value of variable a and the sink read it while the sink is reading the values another source may change it so it implies that sink is having an inconsistent value of shared variable a.
We want to avoid such a situation so that sink should have a consistent value of variable an An improvement is suggested to reduce the level of coupling that exists between the components, due to the high level of coupling that is a danger of inconsistent data in the application.
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The improved solution suggests that there should be a component responsible for reading the value of the shared variable, rather than any component directly reading the value of the shared variable and it will be the responsibility of the data manager to maintain a consistent view of the shared variable.

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The suggested solution is shown below: iii. Control Coupling – Moderate Coupling Two modules exhibit control coupling if one (“module A”) passes to the other (“module B”) a piece of information that is intended to control the internal logic of the other.

This will often be a value used in a test for a case statement, if-then statement, or while loop, in module B’s source code.

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This is perfectly acceptable. Application architecture (verified by structure) diagram) It should be clear that module A controls module B in this way. Have module A call module B directly and vice versa.

Then when the system is combined Together (“integrated”) and tested Two modules are combined and tested into one device, relatively early in the process – so that any problems caused by this pair are identified Depending on the situation, early detection can be good or bad.

when it’s bad Components need to know the internal structure and logic of other modules, which is good for Parameters to enable factorization and function reuse.

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