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1. #Interface segregation principle how to#
2. #Interface segregation principle software#
3. #Interface segregation principle code#
4. #Interface segregation principle series#

Suppose we have to design a system for Printers in which we have to implement different types of Printers like LaserPrinter, InkJetPrinter, LEDPrinter, 3DPrinter. Lets take an example to understand the above with a Printer System Example. In simple terms, an interface should only contain methods that are relevant to the clients that use it and they should not be forced to implement methods that they don’t need. Interface Segregation Principle states that “ Clients should not be forced to depend on methods that they don’t need.” If you have not gone through this, you can see them from the below links Interface Segregation Principle In this series, we have already discussed about the first three principles of SOLID. In this article, we will talk about “I” in SOLID i.e.

#Interface segregation principle series#

Place cover sheet on TPS report before going out Interface Segregation Principle Summaryĭon’t force classes to implement behavior or an interface they will never use.This is the 4th part of the series “ Understanding SOLID in C++”. Collect and combine texts, information, and figures in proper order Passing in a Consultant also gives the desired result $lumbergh = new Lumbergh(new Consultant) Place cover sheet on TPS report before going out Program initech systems to deposit fractions of pennies to private account Let’s try it out.Ĭlass Underling implements UnderlingInterface Passing in an Underling gives the desired result $lumbergh = new Lumbergh(new Underling) Well, maybe we can set up an interface and make Underlings and Consultants implement that interface so that Lumbergh can harass them. Each segregated interface is a lean interface as it only contains methods which are required for a specific client.

#Interface segregation principle software#

How will that play out? Lumbergh should be able to harass Underlings as well as Consultants with equal impunity. Interface segregation Dependency inversion v t e In software engineering, SOLID is a mnemonic acronym for five design principles intended to make object-oriented designs more understandable, flexible, and maintainable. Interface Segregation Principle avoids the design drawbacks associated with a fat interface by refactoring each fat interface into multiple segregated interfaces.

Now what happens when Lumbergh needs to bring in some consultants to Initech. Lumbergh is able to sufficiently harass any new underlings that come across his path. We can see that an Underling should be able to program, filetps, and collate. To begin, we have a Lumbergh class which has a harass method that depends on an Underling to function.

#Interface segregation principle code#

Like always, let us take a look at some code to see what we mean. If we add too many methods to our interfaces, they become too fat, and we start to lose some of the benefits of solid that we are trying to achieve. Namely, with the Interface Segregation Principle, we want to be sure that we don’t stuff our interfaces with the kitchen sink of methods. The Interface Segregation Principle advocates segregating a fat interface into smaller and highly cohesive interfaces, known as role interfaces. This is great, but we can still run into problems with interfaces as well.

#Interface segregation principle how to#

Interface DesignĪt this point, we know how to use an interface in our programs. Just like the rest of the five solid design patterns, the Interface Segregation Principle exists to help decouple modules within the software and make the code easier to understand, refactor, and maintain. This is the main idea of the Interface Segregation Principle.

All it means is that a client should not be forced to implement an interface that it will never use.

Thankfully, it’s a pretty easy one to understand. The Interface Segregation Principle is the next stop on our tour of the 5 solid principles.