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Your address has been added. It can be bad if parameters indicate completely different behavior and good if parameters allow factoring and reuse of functionality. Example- sort function that takes comparison function as an argument. External Coupling: In external coupling, the modules depend on other modules, external to the software being developed or to a particular type of hardware.
Ex- protocol, external file, device format, etc. Common Coupling: The modules have shared data such as global data structures. The changes in global data mean tracing back to all modules which access that data to evaluate the effect of the change. So it has got disadvantages like difficulty in reusing modules, reduced ability to control data accesses and reduced maintainability.
Content Coupling: In a content coupling, one module can modify the data of another module or control flow is passed from one module to the other module. This is the worst form of coupling and should be avoided. Types of Cohesion: Functional Cohesion: Every essential element for a single computation is contained in the component. A functional cohesion performs the task and functions. It is an ideal situation. Sequential Cohesion: An element outputs some data that becomes the input for other element, i.
It occurs naturally in functional programming languages. Communicational Cohesion: Two elements operate on the same input data or contribute towards the same output data. Example- update record int the database and send it to the printer. Procedural Cohesion: Elements of procedural cohesion ensure the order of execution.
Actions are still weakly connected and unlikely to be reusable. Temporal Cohesion: The elements are related by their timing involved. A module connected with temporal cohesion all the tasks must be executed in the same time-span.
This cohesion contains the code for initializing all the parts of the system. Lots of different activities occur, all at init time.
Logical Cohesion: The elements are logically related and not functionally. Ex- A component reads inputs from tape, disk, and network. Other than the form of data, the modules have no other commonly shared resources like the functionality or any other system components. An example of data coupling is that two user interfaces, which share data in terms like module 1 passes data for processing to module 2 and received the processed data back from module 2. Though all the coupling needs to be minimized, this type of coupling is tolerable as it does not affect any other functional behavior of the software.
The impact of this type of coupling on the software application can either be a positive one or a negative one, as it can be defined only based on the type of control being shared by the said modules. It is seen as a positive impact, when the functionality is allowed for reusability. This type of coupling is usually observed in code level, when the arguments are reused in more than one place in the functional part of the code.
Stamp coupling is detected between any two modules which share a compilation of an already structured intricate set of data. As the data and elements are pre-organized and well-placed beforehand, there will be no junk or unused data shared between the two coupling modules.
This helps in improving the general efficiency of the software and its performance, while the system designer should know the limitations to what extent the stamp coupling can be allowed in the system.
External coupling can be described as a situation where the modules are interrelated with common external influencing factors. Coupling in Software Engineering is a crucial process, as it is significant in recognizing and limiting the connection amid the various modules of the software. In addition to this, coupling plays a major role in holding the quality and performance of the software system to a maximum level, by keeping in check the link amidst of all the elements in the software.
This is a guide to Coupling in Software Engineering. Here we discuss the 6 different types of Coupling in Software Engineering along with the respective advantages.
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